From: Thomas Karpiniec Date: Sat, 19 Oct 2024 01:59:43 +0000 (+1100) Subject: Initial commit, basic functionality working X-Git-Tag: v1.0.0~16 X-Git-Url: https://code.octet-stream.net/broadcaster/commitdiff_plain/c94fef11f43279165f39680fa0b0922c86702687?ds=inline Initial commit, basic functionality working --- c94fef11f43279165f39680fa0b0922c86702687 diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..97571d1 --- /dev/null +++ b/.gitignore @@ -0,0 +1,6 @@ +audio +broadcaster-server +broadcaster-radio +test-server.conf +test-radio.conf +test.db diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..c8401c7 --- /dev/null +++ b/go.mod @@ -0,0 +1,33 @@ +module code.octet-stream.net/broadcaster + +go 1.23 + +toolchain go1.23.2 + +require ( + github.com/BurntSushi/toml v1.4.0 + github.com/gopxl/beep/v2 v2.1.0 + github.com/warthog618/go-gpiocdev v0.9.0 + golang.org/x/net v0.30.0 + modernc.org/sqlite v1.33.1 +) + +require ( + github.com/dustin/go-humanize v1.0.1 // indirect + github.com/ebitengine/oto/v3 v3.2.0 // indirect + github.com/ebitengine/purego v0.7.1 // indirect + github.com/google/uuid v1.6.0 // indirect + github.com/hajimehoshi/go-mp3 v0.3.4 // indirect + github.com/hashicorp/golang-lru/v2 v2.0.7 // indirect + github.com/mattn/go-isatty v0.0.20 // indirect + github.com/ncruces/go-strftime v0.1.9 // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect + golang.org/x/sys v0.26.0 // indirect + modernc.org/gc/v3 v3.0.0-20240107210532-573471604cb6 // indirect + modernc.org/libc v1.55.3 // indirect + modernc.org/mathutil v1.6.0 // indirect + modernc.org/memory v1.8.0 // indirect + modernc.org/strutil v1.2.0 // indirect + modernc.org/token v1.1.0 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..3184d32 --- /dev/null +++ b/go.sum @@ -0,0 +1,77 @@ +github.com/BurntSushi/toml v1.4.0 h1:kuoIxZQy2WRRk1pttg9asf+WVv6tWQuBNVmK8+nqPr0= +github.com/BurntSushi/toml v1.4.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho= +github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= +github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY= +github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto= +github.com/ebitengine/oto/v3 v3.2.0 h1:FuggTJTSI3/3hEYwZEIN0CZVXYT29ZOdCu+z/f4QjTw= +github.com/ebitengine/oto/v3 v3.2.0/go.mod h1:dOKXShvy1EQbIXhXPFcKLargdnFqH0RjptecvyAxhyw= +github.com/ebitengine/purego v0.7.1 h1:6/55d26lG3o9VCZX8lping+bZcmShseiqlh2bnUDiPA= +github.com/ebitengine/purego v0.7.1/go.mod h1:ah1In8AOtksoNK6yk5z1HTJeUkC1Ez4Wk2idgGslMwQ= +github.com/google/pprof v0.0.0-20240409012703-83162a5b38cd h1:gbpYu9NMq8jhDVbvlGkMFWCjLFlqqEZjEmObmhUy6Vo= +github.com/google/pprof v0.0.0-20240409012703-83162a5b38cd/go.mod h1:kf6iHlnVGwgKolg33glAes7Yg/8iWP8ukqeldJSO7jw= +github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0= +github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo= +github.com/gopxl/beep/v2 v2.1.0 h1:Jv95iHw3aNWoAa/J78YyXvOvMHH2ZGeAYD5ug8tVt8c= +github.com/gopxl/beep/v2 v2.1.0/go.mod h1:sQvj2oSsu8fmmDWH3t0DzIe0OZzTW6/TJEHW4Ku+22o= +github.com/hajimehoshi/go-mp3 v0.3.4 h1:NUP7pBYH8OguP4diaTZ9wJbUbk3tC0KlfzsEpWmYj68= +github.com/hajimehoshi/go-mp3 v0.3.4/go.mod h1:fRtZraRFcWb0pu7ok0LqyFhCUrPeMsGRSVop0eemFmo= +github.com/hajimehoshi/oto/v2 v2.3.1/go.mod h1:seWLbgHH7AyUMYKfKYT9pg7PhUu9/SisyJvNTT+ASQo= +github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k= +github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM= +github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY= +github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y= +github.com/ncruces/go-strftime v0.1.9 h1:bY0MQC28UADQmHmaF5dgpLmImcShSi2kHU9XLdhx/f4= +github.com/ncruces/go-strftime v0.1.9/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls= +github.com/orcaman/writerseeker v0.0.0-20200621085525-1d3f536ff85e h1:s2RNOM/IGdY0Y6qfTeUKhDawdHDpK9RGBdx80qN4Ttw= +github.com/orcaman/writerseeker v0.0.0-20200621085525-1d3f536ff85e/go.mod h1:nBdnFKj15wFbf94Rwfq4m30eAcyY9V/IyKAGQFtqkW0= +github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4= +github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0= +github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= +github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= +github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE= +github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo= +github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg= +github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY= +github.com/warthog618/go-gpiocdev v0.9.0 h1:AZWUq1WObgKCO9cJCACFpwWQw6yu8vJbIE6fRZ+6cbY= +github.com/warthog618/go-gpiocdev v0.9.0/go.mod h1:GV4NZC82fWJERqk7Gu0+KfLSDIBEDNm6aPGiHlmT5fY= +github.com/warthog618/go-gpiosim v0.1.0 h1:2rTMTcKUVZxpUuvRKsagnKAbKpd3Bwffp87xywEDVGI= +github.com/warthog618/go-gpiosim v0.1.0/go.mod h1:Ngx/LYI5toxHr4E+Vm6vTgCnt0of0tktsSuMUEJ2wCI= +golang.org/x/mod v0.16.0 h1:QX4fJ0Rr5cPQCF7O9lh9Se4pmwfwskqZfq5moyldzic= +golang.org/x/mod v0.16.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c= +golang.org/x/net v0.30.0 h1:AcW1SDZMkb8IpzCdQUaIq2sP4sZ4zw+55h6ynffypl4= +golang.org/x/net v0.30.0/go.mod h1:2wGyMJ5iFasEhkwi13ChkO/t1ECNC4X4eBKkVFyYFlU= +golang.org/x/sys v0.0.0-20220712014510-0a85c31ab51e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= +golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= +golang.org/x/sys v0.26.0 h1:KHjCJyddX0LoSTb3J+vWpupP9p0oznkqVk/IfjymZbo= +golang.org/x/sys v0.26.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA= +golang.org/x/tools v0.19.0 h1:tfGCXNR1OsFG+sVdLAitlpjAvD/I6dHDKnYrpEZUHkw= +golang.org/x/tools v0.19.0/go.mod h1:qoJWxmGSIBmAeriMx19ogtrEPrGtDbPK634QFIcLAhc= +gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= +gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +modernc.org/cc/v4 v4.21.4 h1:3Be/Rdo1fpr8GrQ7IVw9OHtplU4gWbb+wNgeoBMmGLQ= +modernc.org/cc/v4 v4.21.4/go.mod h1:HM7VJTZbUCR3rV8EYBi9wxnJ0ZBRiGE5OeGXNA0IsLQ= +modernc.org/ccgo/v4 v4.19.2 h1:lwQZgvboKD0jBwdaeVCTouxhxAyN6iawF3STraAal8Y= +modernc.org/ccgo/v4 v4.19.2/go.mod h1:ysS3mxiMV38XGRTTcgo0DQTeTmAO4oCmJl1nX9VFI3s= +modernc.org/fileutil v1.3.0 h1:gQ5SIzK3H9kdfai/5x41oQiKValumqNTDXMvKo62HvE= +modernc.org/fileutil v1.3.0/go.mod h1:XatxS8fZi3pS8/hKG2GH/ArUogfxjpEKs3Ku3aK4JyQ= +modernc.org/gc/v2 v2.4.1 h1:9cNzOqPyMJBvrUipmynX0ZohMhcxPtMccYgGOJdOiBw= +modernc.org/gc/v2 v2.4.1/go.mod h1:wzN5dK1AzVGoH6XOzc3YZ+ey/jPgYHLuVckd62P0GYU= +modernc.org/gc/v3 v3.0.0-20240107210532-573471604cb6 h1:5D53IMaUuA5InSeMu9eJtlQXS2NxAhyWQvkKEgXZhHI= +modernc.org/gc/v3 v3.0.0-20240107210532-573471604cb6/go.mod h1:Qz0X07sNOR1jWYCrJMEnbW/X55x206Q7Vt4mz6/wHp4= +modernc.org/libc v1.55.3 h1:AzcW1mhlPNrRtjS5sS+eW2ISCgSOLLNyFzRh/V3Qj/U= +modernc.org/libc v1.55.3/go.mod h1:qFXepLhz+JjFThQ4kzwzOjA/y/artDeg+pcYnY+Q83w= +modernc.org/mathutil v1.6.0 h1:fRe9+AmYlaej+64JsEEhoWuAYBkOtQiMEU7n/XgfYi4= +modernc.org/mathutil v1.6.0/go.mod h1:Ui5Q9q1TR2gFm0AQRqQUaBWFLAhQpCwNcuhBOSedWPo= +modernc.org/memory v1.8.0 h1:IqGTL6eFMaDZZhEWwcREgeMXYwmW83LYW8cROZYkg+E= +modernc.org/memory v1.8.0/go.mod h1:XPZ936zp5OMKGWPqbD3JShgd/ZoQ7899TUuQqxY+peU= +modernc.org/opt v0.1.3 h1:3XOZf2yznlhC+ibLltsDGzABUGVx8J6pnFMS3E4dcq4= +modernc.org/opt v0.1.3/go.mod h1:WdSiB5evDcignE70guQKxYUl14mgWtbClRi5wmkkTX0= +modernc.org/sortutil v1.2.0 h1:jQiD3PfS2REGJNzNCMMaLSp/wdMNieTbKX920Cqdgqc= +modernc.org/sortutil v1.2.0/go.mod h1:TKU2s7kJMf1AE84OoiGppNHJwvB753OYfNl2WRb++Ss= +modernc.org/sqlite v1.33.1 h1:trb6Z3YYoeM9eDL1O8do81kP+0ejv+YzgyFo+Gwy0nM= +modernc.org/sqlite v1.33.1/go.mod h1:pXV2xHxhzXZsgT/RtTFAPY6JJDEvOTcTdwADQCCWD4k= +modernc.org/strutil v1.2.0 h1:agBi9dp1I+eOnxXeiZawM8F4LawKv4NzGWSaLfyeNZA= +modernc.org/strutil v1.2.0/go.mod h1:/mdcBmfOibveCTBxUl5B5l6W+TTH1FXPLHZE6bTosX0= +modernc.org/token v1.1.0 h1:Xl7Ap9dKaEs5kLoOQeQmPWevfnk/DM5qcLcYlA8ys6Y= +modernc.org/token v1.1.0/go.mod h1:UGzOrNV1mAFSEB63lOFHIpNRUVMvYTc6yu1SMY/XTDM= diff --git a/protocol/protocol.go b/protocol/protocol.go new file mode 100644 index 0000000..d168bc3 --- /dev/null +++ b/protocol/protocol.go @@ -0,0 +1,152 @@ +package protocol + +import ( + "encoding/json" + "errors" + "fmt" +) + +const ( + StartTimeFormat = "2006-01-02T15:04" + LocalTimeFormat = "Mon _2 Jan 2006 15:04:05" + + // Radio to server + + AuthenticateType = "authenticate" + StatusType = "status" + + // Server to radio + + FilesType = "files" + PlaylistsType = "playlists" + + // Status values + + StatusIdle = "idle" + StatusDelay = "delay" + StatusChannelInUse = "channel_in_use" + StatusPlaying = "playing" +) + +// Base message type to determine what type of payload is expected. +type Message struct { + T string +} + +// Initial message from Radio to authenticate itself with a token string. +type AuthenticateMessage struct { + T string + Token string +} + +// Server updates the radio with the list of files that currently exist. +// This will be provided on connect and when there are any changes. +// The radio is expected to obtain all these files and cache them locally. +type FilesMessage struct { + T string + Files []FileSpec +} + +type PlaylistsMessage struct { + T string + Playlists []PlaylistSpec +} + +type StatusMessage struct { + T string + + // Status w.r.t. playing a playlist + Status string + + // File being played or about to be played - empty string in idle status + Filename string + + // Name of playlist being played - empty string in idle status + Playlist string + + // Seconds until playback begins - never mind latency + DelaySecondsRemaining int + + // Number of seconds file has been actually playing + PlaybackSecondsElapsed int + + // Number of seconds waiting for channel to clear + WaitingForChannelSeconds int + + PTT bool + COS bool + FilesInSync bool + + // Timestamp of the current time on this radio, using LocalTimeFormat + LocalTime string + + // Time zone in use, e.g. "Australia/Hobart" + TimeZone string +} + +// Description of an individual file available in the broadcasting system. +type FileSpec struct { + // Filename, e.g. "broadcast.wav" + Name string + // SHA-256 hash of the file's contents + Hash string +} + +type PlaylistSpec struct { + Id int + Name string + StartTime string + Entries []EntrySpec +} + +type EntrySpec struct { + Filename string + DelaySeconds int + IsRelative bool +} + +func ParseMessage(data []byte) (string, interface{}, error) { + var t Message + err := json.Unmarshal(data, &t) + if err != nil { + return "", nil, err + } + + if t.T == AuthenticateType { + var auth AuthenticateMessage + err = json.Unmarshal(data, &auth) + if err != nil { + return "", nil, err + } + return t.T, auth, nil + } + + if t.T == FilesType { + var files FilesMessage + err = json.Unmarshal(data, &files) + if err != nil { + return "", nil, err + } + return t.T, files, nil + } + + if t.T == PlaylistsType { + var playlists PlaylistsMessage + err = json.Unmarshal(data, &playlists) + if err != nil { + return "", nil, err + } + return t.T, playlists, nil + } + + if t.T == StatusType { + var status StatusMessage + err = json.Unmarshal(data, &status) + if err != nil { + return "", nil, err + } + return t.T, status, nil + } + + return "", nil, errors.New(fmt.Sprintf("unknown message type %v", t.T)) +} diff --git a/radio/config.go b/radio/config.go new file mode 100644 index 0000000..3152653 --- /dev/null +++ b/radio/config.go @@ -0,0 +1,70 @@ +package main + +import ( + "errors" + "log" + "os" + "strings" + + "github.com/BurntSushi/toml" +) + +type RadioConfig struct { + GpioDevice string + PTTPin int + COSPin int + ServerURL string + Token string + CachePath string + TimeZone string +} + +func NewRadioConfig() RadioConfig { + return RadioConfig{ + GpioDevice: "gpiochip0", + PTTPin: -1, + COSPin: -1, + ServerURL: "", + Token: "", + CachePath: "", + TimeZone: "Australia/Hobart", + } +} + +func (c *RadioConfig) LoadFromFile(path string) { + _, err := toml.DecodeFile(path, &c) + if err != nil { + log.Fatal("could not read config file for reading at path:", path, err) + } + err = c.Validate() + if err != nil { + log.Fatal(err) + } + c.ApplyDefaults() +} + +func (c *RadioConfig) Validate() error { + if c.ServerURL == "" { + return errors.New("ServerURL must be provided in the configuration") + } + if c.Token == "" { + return errors.New("Token must be provided in the configuration") + } + return nil +} + +func (c *RadioConfig) ApplyDefaults() { + if c.CachePath == "" { + dir, err := os.MkdirTemp("", "broadcast") + if err != nil { + log.Fatal(err) + } + c.CachePath = dir + } +} + +func (c *RadioConfig) WebsocketURL() string { + addr := strings.Replace(c.ServerURL, "https://", "wss://", -1) + addr = strings.Replace(addr, "http://", "ws://", -1) + return addr + "/radiosync" +} diff --git a/radio/files_machine.go b/radio/files_machine.go new file mode 100644 index 0000000..ea2f775 --- /dev/null +++ b/radio/files_machine.go @@ -0,0 +1,117 @@ +package main + +import ( + "code.octet-stream.net/broadcaster/protocol" + "crypto/sha256" + "encoding/hex" + "io" + "log" + "net/http" + "os" + "path/filepath" +) + +type FilesMachine struct { + specs []protocol.FileSpec + cachePath string + missing []string +} + +func NewFilesMachine(cachePath string) FilesMachine { + if err := os.MkdirAll(cachePath, 0750); err != nil { + log.Fatal(err) + } + return FilesMachine{ + cachePath: cachePath, + } +} + +func (m *FilesMachine) UpdateSpecs(specs []protocol.FileSpec) { + m.specs = specs + m.RefreshMissing() +} + +func (m *FilesMachine) RefreshMissing() { + // Delete any files in the cache dir who are not in the spec + entries, err := os.ReadDir(m.cachePath) + if err != nil { + log.Fatal(err) + } + okay := make([]string, 0) + for _, file := range entries { + hash := "" + for _, spec := range m.specs { + if file.Name() == spec.Name { + hash = spec.Hash + break + } + } + // if we have an extraneous file, delete it + if hash == "" { + log.Println("Deleting extraneous cached audio file:", file.Name()) + os.Remove(filepath.Join(m.cachePath, file.Name())) + continue + } + // if the hash isn't right, delete it + f, err := os.Open(filepath.Join(m.cachePath, file.Name())) + if err != nil { + log.Fatal(err) + } + hasher := sha256.New() + io.Copy(hasher, f) + if hex.EncodeToString(hasher.Sum(nil)) != hash { + log.Println("Deleting cached audio file with incorrect hash:", file.Name()) + os.Remove(filepath.Join(m.cachePath, file.Name())) + } else { + okay = append(okay, file.Name()) + } + } + m.missing = nil + for _, spec := range m.specs { + missing := true + for _, file := range okay { + if spec.Name == file { + missing = false + } + } + if missing { + m.missing = append(m.missing, spec.Name) + } + } + if len(m.missing) > 1 { + log.Println(len(m.missing), "missing files") + } else if len(m.missing) == 1 { + log.Println("1 missing file") + } else { + log.Println("All files are in sync with server") + } + statusCollector.FilesInSync <- len(m.missing) == 0 +} + +func (m *FilesMachine) IsCacheComplete() bool { + return len(m.missing) == 0 +} + +func (m *FilesMachine) NextFile() string { + next, remainder := m.missing[0], m.missing[1:] + m.missing = remainder + return next +} + +func (m *FilesMachine) DownloadSingle(filename string, downloadResult chan<- error) { + log.Println("Downloading", filename) + out, err := os.Create(filepath.Join(m.cachePath, filename)) + if err != nil { + downloadResult <- err + return + } + defer out.Close() + resp, err := http.Get(config.ServerURL + "/audio-files/" + filename) + if err != nil { + downloadResult <- err + return + } + defer resp.Body.Close() + _, err = io.Copy(out, resp.Body) + downloadResult <- err +} diff --git a/radio/gpio.go b/radio/gpio.go new file mode 100644 index 0000000..69807ac --- /dev/null +++ b/radio/gpio.go @@ -0,0 +1,123 @@ +package main + +import ( + gpio "github.com/warthog618/go-gpiocdev" + "github.com/warthog618/go-gpiocdev/device/rpi" + "log" + "strconv" +) + +type PTT interface { + EngagePTT() + DisengagePTT() +} + +type COS interface { + WaitForChannelClear() + COSValue() bool +} + +var ptt PTT = &DefaultPTT{} +var cos COS = &DefaultCOS{} + +type PiPTT struct { + pttLine *gpio.Line +} + +type PiCOS struct { + cosLine *gpio.Line + clearWait chan bool +} + +func InitRaspberryPiPTT(pttNum int, chipName string) { + pttPin, err := rpi.Pin("GPIO" + strconv.Itoa(pttNum)) + if err != nil { + log.Fatal("invalid PTT pin configured", ptt) + } + pttLine, err := gpio.RequestLine(chipName, pttPin, gpio.AsOutput(0)) + if err != nil { + log.Fatal("unable to open requested pin for PTT GPIO:", ptt, ". Are you running as root?") + } + ptt = &PiPTT{ + pttLine: pttLine, + } +} + +func InitRaspberryPiCOS(cosNum int, chipName string) { + var piCOS PiCOS + piCOS.clearWait = make(chan bool) + cosPin, err := rpi.Pin("GPIO" + strconv.Itoa(cosNum)) + if err != nil { + log.Fatal("invalid COS Pin configured", cos) + } + cosHandler := func(event gpio.LineEvent) { + if event.Type == gpio.LineEventFallingEdge { + log.Println("COS: channel clear") + close(piCOS.clearWait) + piCOS.clearWait = make(chan bool) + statusCollector.COS <- false + } + if event.Type == gpio.LineEventRisingEdge { + log.Println("COS: channel in use") + statusCollector.COS <- true + } + } + cosLine, err := gpio.RequestLine(chipName, cosPin, gpio.AsInput, gpio.WithBothEdges, gpio.WithEventHandler(cosHandler)) + if err != nil { + log.Fatal("unable to open requested pin for COS GPIO:", cos, ". Are you running as root?") + } + piCOS.cosLine = cosLine + cos = &piCOS +} + +func (g *PiCOS) COSValue() bool { + val, err := g.cosLine.Value() + if err != nil { + log.Fatal("Unable to read COS value") + } + return val != 0 +} + +func (g *PiCOS) WaitForChannelClear() { + ch := g.clearWait + val, err := g.cosLine.Value() + if err != nil || val == 0 { + return + } + // wait for close + <-ch +} + +func (g *PiPTT) EngagePTT() { + log.Println("PTT: on") + g.pttLine.SetValue(1) + statusCollector.PTT <- true +} + +func (g *PiPTT) DisengagePTT() { + log.Println("PTT: off") + g.pttLine.SetValue(0) + statusCollector.PTT <- false +} + +type DefaultPTT struct { +} + +func (g *DefaultPTT) EngagePTT() { + statusCollector.PTT <- true +} + +func (g *DefaultPTT) DisengagePTT() { + statusCollector.PTT <- false +} + +type DefaultCOS struct { +} + +func (g *DefaultCOS) WaitForChannelClear() { + log.Println("Assuming channel is clear since COS GPIO is not configured") +} + +func (g *DefaultCOS) COSValue() bool { + return false +} diff --git a/radio/radio.go b/radio/radio.go new file mode 100644 index 0000000..f6b3b50 --- /dev/null +++ b/radio/radio.go @@ -0,0 +1,306 @@ +package main + +import ( + "code.octet-stream.net/broadcaster/protocol" + "encoding/json" + "flag" + "github.com/gopxl/beep/v2" + "github.com/gopxl/beep/v2/mp3" + "github.com/gopxl/beep/v2/speaker" + "github.com/gopxl/beep/v2/wav" + "golang.org/x/net/websocket" + "log" + "os" + "os/signal" + "path/filepath" + "strings" + "syscall" + "time" +) + +const sampleRate = 44100 + +var config RadioConfig = NewRadioConfig() + +func main() { + configFlag := flag.String("c", "", "path to configuration file") + // TODO: support this + //generateFlag := flag.String("g", "", "create a template config file with specified name then exit") + flag.Parse() + + if *configFlag == "" { + log.Fatal("must specify a configuration file with -c") + } + config.LoadFromFile(*configFlag) + statusCollector.Config <- config + + playbackSampleRate := beep.SampleRate(sampleRate) + speaker.Init(playbackSampleRate, playbackSampleRate.N(time.Second/10)) + + if config.PTTPin != -1 { + InitRaspberryPiPTT(config.PTTPin, config.GpioDevice) + } + if config.COSPin != -1 { + InitRaspberryPiCOS(config.COSPin, config.GpioDevice) + } + + sig := make(chan os.Signal, 1) + signal.Notify(sig, syscall.SIGINT, syscall.SIGTERM) + go func() { + sig := <-sig + log.Println("Radio shutting down due to signal", sig) + // Make sure we always stop PTT when program ends + ptt.DisengagePTT() + os.Exit(0) + }() + + log.Println("Config checks out, radio coming online") + log.Println("Audio file cache:", config.CachePath) + + fileSpecChan := make(chan []protocol.FileSpec) + go filesWorker(config.CachePath, fileSpecChan) + + playlistSpecChan := make(chan []protocol.PlaylistSpec) + go playlistWorker(playlistSpecChan) + + for { + runWebsocket(fileSpecChan, playlistSpecChan) + log.Println("Websocket failed, retry in 30 seconds") + time.Sleep(time.Second * time.Duration(30)) + } +} + +func runWebsocket(fileSpecChan chan []protocol.FileSpec, playlistSpecChan chan []protocol.PlaylistSpec) error { + log.Println("Establishing websocket connection to:", config.WebsocketURL()) + ws, err := websocket.Dial(config.WebsocketURL(), "", config.ServerURL) + if err != nil { + return err + } + + auth := protocol.AuthenticateMessage{ + T: "authenticate", + Token: config.Token, + } + msg, _ := json.Marshal(auth) + + if _, err := ws.Write(msg); err != nil { + log.Fatal(err) + } + statusCollector.Websocket <- ws + + buf := make([]byte, 16384) + badRead := false + for { + n, err := ws.Read(buf) + if err != nil { + log.Println("Lost websocket to server") + return err + } + // Ignore any massively oversize messages + if n == len(buf) { + badRead = true + continue + } else if badRead { + badRead = false + continue + } + + t, msg, err := protocol.ParseMessage(buf[:n]) + if err != nil { + log.Println("Message parse error", err) + return err + } + + if t == protocol.FilesType { + filesMsg := msg.(protocol.FilesMessage) + fileSpecChan <- filesMsg.Files + } + + if t == protocol.PlaylistsType { + playlistsMsg := msg.(protocol.PlaylistsMessage) + playlistSpecChan <- playlistsMsg.Playlists + } + } +} + +func filesWorker(cachePath string, ch chan []protocol.FileSpec) { + machine := NewFilesMachine(cachePath) + isDownloading := false + downloadResult := make(chan error) + var timer *time.Timer + + for { + var timerCh <-chan time.Time = nil + if timer != nil { + timerCh = timer.C + } + doNext := false + select { + case specs := <-ch: + log.Println("Received new file specs", specs) + machine.UpdateSpecs(specs) + doNext = true + timer = nil + case err := <-downloadResult: + isDownloading = false + machine.RefreshMissing() + if err != nil { + log.Println(err) + if !machine.IsCacheComplete() { + timer = time.NewTimer(30 * time.Second) + } + } else { + if !machine.IsCacheComplete() { + timer = time.NewTimer(10 * time.Millisecond) + } + } + case <-timerCh: + doNext = true + timer = nil + } + + if doNext && !isDownloading && !machine.IsCacheComplete() { + next := machine.NextFile() + isDownloading = true + go machine.DownloadSingle(next, downloadResult) + } + } +} + +func playlistWorker(ch <-chan []protocol.PlaylistSpec) { + var specs []protocol.PlaylistSpec + isPlaying := false + playbackFinished := make(chan error) + nextId := 0 + var timer *time.Timer + + for { + var timerCh <-chan time.Time = nil + if timer != nil { + timerCh = timer.C + } + doNext := false + select { + case specs = <-ch: + log.Println("Received new playlist specs", specs) + doNext = true + case <-playbackFinished: + isPlaying = false + doNext = true + case <-timerCh: + timer = nil + isPlaying = true + for _, v := range specs { + if v.Id == nextId { + go playPlaylist(v, playbackFinished) + } + } + } + + if doNext && !isPlaying { + timer = nil + found := false + loc, err := time.LoadLocation(config.TimeZone) + if err != nil { + log.Fatal(err) + } + var soonestTime time.Time + for _, v := range specs { + t, err := time.ParseInLocation(protocol.StartTimeFormat, v.StartTime, loc) + if err != nil { + log.Println("Error parsing start time", err) + continue + } + if t.Before(time.Now()) { + continue + } + if !found || t.Before(soonestTime) { + soonestTime = t + found = true + nextId = v.Id + } + } + if found { + duration := soonestTime.Sub(time.Now()) + log.Println("Next playlist will be id", nextId, "in", duration.Seconds(), "seconds") + timer = time.NewTimer(duration) + } else { + log.Println("No future playlists") + } + } + } +} + +func playPlaylist(playlist protocol.PlaylistSpec, playbackFinished chan<- error) { + // TODO: possibility of on-demand cancellation + startTime := time.Now() + log.Println("Beginning playback of playlist", playlist.Name) + for _, p := range playlist.Entries { + // delay + var duration time.Duration + if p.IsRelative { + duration = time.Second * time.Duration(p.DelaySeconds) + } else { + duration = time.Until(startTime.Add(time.Second * time.Duration(p.DelaySeconds))) + } + statusCollector.PlaylistBeginDelay <- BeginDelayStatus{ + Playlist: playlist.Name, + Seconds: int(duration.Seconds()), + Filename: p.Filename, + } + <-time.After(duration) + + statusCollector.PlaylistBeginWaitForChannel <- BeginWaitForChannelStatus{ + Playlist: playlist.Name, + Filename: p.Filename, + } + cos.WaitForChannelClear() + + // then play + statusCollector.PlaylistBeginPlayback <- BeginPlaybackStatus{ + Playlist: playlist.Name, + Filename: p.Filename, + } + ptt.EngagePTT() + f, err := os.Open(filepath.Join(config.CachePath, p.Filename)) + if err != nil { + log.Println("Couldn't open file for playlist", p.Filename) + continue + } + log.Println("Playing file", p.Filename) + l := strings.ToLower(p.Filename) + var streamer beep.StreamSeekCloser + var format beep.Format + if strings.HasSuffix(l, ".mp3") { + streamer, format, err = mp3.Decode(f) + } else if strings.HasSuffix(l, ".wav") { + streamer, format, err = wav.Decode(f) + } else { + log.Println("Unrecognised file extension (.wav and .mp3 supported), moving on") + } + if err != nil { + log.Println("Could not decode media file", err) + continue + } + defer streamer.Close() + + done := make(chan bool) + + if format.SampleRate != sampleRate { + resampled := beep.Resample(4, format.SampleRate, sampleRate, streamer) + speaker.Play(beep.Seq(resampled, beep.Callback(func() { + done <- true + }))) + } else { + speaker.Play(beep.Seq(streamer, beep.Callback(func() { + done <- true + }))) + } + + <-done + ptt.DisengagePTT() + } + log.Println("Playlist finished", playlist.Name) + statusCollector.PlaylistBeginIdle <- true + playbackFinished <- nil +} diff --git a/radio/status.go b/radio/status.go new file mode 100644 index 0000000..797a28f --- /dev/null +++ b/radio/status.go @@ -0,0 +1,140 @@ +package main + +import ( + "code.octet-stream.net/broadcaster/protocol" + "encoding/json" + "golang.org/x/net/websocket" + "time" +) + +type BeginDelayStatus struct { + Playlist string + Seconds int + Filename string +} + +type BeginWaitForChannelStatus struct { + Playlist string + Filename string +} + +type BeginPlaybackStatus struct { + Playlist string + Filename string +} + +type StatusCollector struct { + Websocket chan *websocket.Conn + PlaylistBeginIdle chan bool + PlaylistBeginDelay chan BeginDelayStatus + PlaylistBeginWaitForChannel chan BeginWaitForChannelStatus + PlaylistBeginPlayback chan BeginPlaybackStatus + PTT chan bool + COS chan bool + Config chan RadioConfig + FilesInSync chan bool +} + +var statusCollector = NewStatusCollector() + +func NewStatusCollector() StatusCollector { + sc := StatusCollector{ + Websocket: make(chan *websocket.Conn), + PlaylistBeginIdle: make(chan bool), + PlaylistBeginDelay: make(chan BeginDelayStatus), + PlaylistBeginWaitForChannel: make(chan BeginWaitForChannelStatus), + PlaylistBeginPlayback: make(chan BeginPlaybackStatus), + PTT: make(chan bool), + COS: make(chan bool), + Config: make(chan RadioConfig), + FilesInSync: make(chan bool), + } + go runStatusCollector(sc) + return sc +} + +func runStatusCollector(sc StatusCollector) { + config := <-sc.Config + var msg protocol.StatusMessage + var lastSent protocol.StatusMessage + msg.T = protocol.StatusType + msg.TimeZone = config.TimeZone + msg.Status = protocol.StatusIdle + var ws *websocket.Conn + // Go 1.23: no need to stop tickers when finished + var ticker = time.NewTicker(time.Second * time.Duration(30)) + + for { + select { + case newWebsocket := <-sc.Websocket: + ws = newWebsocket + case <-ticker.C: + // should always be ticking at 1 second for these + if msg.Status == protocol.StatusDelay { + if msg.DelaySecondsRemaining > 0 { + msg.DelaySecondsRemaining -= 1 + } + } + if msg.Status == protocol.StatusChannelInUse { + msg.WaitingForChannelSeconds += 1 + } + if msg.Status == protocol.StatusPlaying { + msg.PlaybackSecondsElapsed += 1 + } + case <-sc.PlaylistBeginIdle: + msg.Status = protocol.StatusIdle + msg.DelaySecondsRemaining = 0 + msg.WaitingForChannelSeconds = 0 + msg.PlaybackSecondsElapsed = 0 + msg.Playlist = "" + msg.Filename = "" + // Update things more slowly when nothing's playing + ticker = time.NewTicker(time.Second * time.Duration(30)) + case delay := <-sc.PlaylistBeginDelay: + msg.Status = protocol.StatusDelay + msg.DelaySecondsRemaining = delay.Seconds + msg.WaitingForChannelSeconds = 0 + msg.PlaybackSecondsElapsed = 0 + msg.Playlist = delay.Playlist + msg.Filename = delay.Filename + // Align ticker with start of state change, make sure it's faster + ticker = time.NewTicker(time.Second * time.Duration(1)) + case wait := <-sc.PlaylistBeginWaitForChannel: + msg.Status = protocol.StatusChannelInUse + msg.DelaySecondsRemaining = 0 + msg.WaitingForChannelSeconds = 0 + msg.PlaybackSecondsElapsed = 0 + msg.Playlist = wait.Playlist + msg.Filename = wait.Filename + ticker = time.NewTicker(time.Second * time.Duration(1)) + case playback := <-sc.PlaylistBeginPlayback: + msg.Status = protocol.StatusPlaying + msg.DelaySecondsRemaining = 0 + msg.WaitingForChannelSeconds = 0 + msg.PlaybackSecondsElapsed = 0 + msg.Playlist = playback.Playlist + msg.Filename = playback.Filename + ticker = time.NewTicker(time.Second * time.Duration(1)) + case ptt := <-sc.PTT: + msg.PTT = ptt + case cos := <-sc.COS: + msg.COS = cos + case inSync := <-sc.FilesInSync: + msg.FilesInSync = inSync + } + msg.LocalTime = time.Now().Format(protocol.LocalTimeFormat) + msg.COS = cos.COSValue() + + if msg == lastSent { + continue + } + if ws != nil { + msgJson, _ := json.Marshal(msg) + if _, err := ws.Write(msgJson); err != nil { + // If websocket has failed, wait 'til we get a new one + ws = nil + } + lastSent = msg + } + } +} diff --git a/server/broadcaster.go b/server/broadcaster.go new file mode 100644 index 0000000..2e09249 --- /dev/null +++ b/server/broadcaster.go @@ -0,0 +1,408 @@ +package main + +import ( + "flag" + "golang.org/x/net/websocket" + "html/template" + "io" + "log" + "net/http" + "os" + "path/filepath" + "strconv" + "strings" + "time" +) + +const formatString = "2006-01-02T15:04" + +var config ServerConfig = NewServerConfig() + +// Channel that will be closed and recreated every time the playlists change +var playlistChangeWait = make(chan bool) + +func main() { + configFlag := flag.String("c", "", "path to configuration file") + // TODO: support this + //generateFlag := flag.String("g", "", "create a template config file with specified name then exit") + flag.Parse() + + if *configFlag == "" { + log.Fatal("must specify a configuration file with -c") + } + config.LoadFromFile(*configFlag) + + log.Println("Hello, World! Woo broadcast time") + InitDatabase() + defer db.CloseDatabase() + + InitAudioFiles(config.AudioFilesPath) + InitServerStatus() + + http.HandleFunc("/", homePage) + http.HandleFunc("/login", logInPage) + http.HandleFunc("/logout", logOutPage) + http.HandleFunc("/secret", secretPage) + + http.HandleFunc("/playlist/", playlistSection) + http.HandleFunc("/file/", fileSection) + http.HandleFunc("/radio/", radioSection) + + http.Handle("/radiosync", websocket.Handler(RadioSync)) + http.Handle("/websync", websocket.Handler(WebSync)) + http.Handle("/audio-files/", http.StripPrefix("/audio-files/", http.FileServer(http.Dir(config.AudioFilesPath)))) + + err := http.ListenAndServe(config.BindAddress+":"+strconv.Itoa(config.Port), nil) + if err != nil { + log.Fatal(err) + } +} + +type HomeData struct { + LoggedIn bool + Username string +} + +func homePage(w http.ResponseWriter, r *http.Request) { + tmpl := template.Must(template.ParseFiles("templates/index.html")) + data := HomeData{ + LoggedIn: true, + Username: "Bob", + } + tmpl.Execute(w, data) +} + +func secretPage(w http.ResponseWriter, r *http.Request) { + user, err := currentUser(w, r) + if err != nil { + http.Redirect(w, r, "/login", http.StatusFound) + return + } + tmpl := template.Must(template.ParseFiles("templates/index.html")) + data := HomeData{ + LoggedIn: true, + Username: user.username + ", you are special", + } + tmpl.Execute(w, data) +} + +type LogInData struct { + Error string +} + +func logInPage(w http.ResponseWriter, r *http.Request) { + log.Println("Log in page!") + r.ParseForm() + username := r.Form["username"] + password := r.Form["password"] + err := "" + if username != nil { + log.Println("Looks like we have a username", username[0]) + if username[0] == "admin" && password[0] == "test" { + createSessionCookie(w) + http.Redirect(w, r, "/", http.StatusFound) + return + } else { + err = "Incorrect login" + } + } + + data := LogInData{ + Error: err, + } + + tmpl := template.Must(template.ParseFiles("templates/login.html")) + tmpl.Execute(w, data) +} + +func playlistSection(w http.ResponseWriter, r *http.Request) { + path := strings.Split(r.URL.Path, "/") + if len(path) != 3 { + http.NotFound(w, r) + return + } + if path[2] == "new" { + editPlaylistPage(w, r, 0) + } else if path[2] == "submit" && r.Method == "POST" { + submitPlaylist(w, r) + } else if path[2] == "delete" && r.Method == "POST" { + deletePlaylist(w, r) + } else if path[2] == "" { + playlistsPage(w, r) + } else { + id, err := strconv.Atoi(path[2]) + if err != nil { + http.NotFound(w, r) + return + } + editPlaylistPage(w, r, id) + } +} + +func fileSection(w http.ResponseWriter, r *http.Request) { + path := strings.Split(r.URL.Path, "/") + if len(path) != 3 { + http.NotFound(w, r) + return + } + if path[2] == "upload" { + uploadFile(w, r) + } else if path[2] == "delete" && r.Method == "POST" { + deleteFile(w, r) + } else if path[2] == "" { + filesPage(w, r) + } else { + http.NotFound(w, r) + return + } +} + +func radioSection(w http.ResponseWriter, r *http.Request) { + path := strings.Split(r.URL.Path, "/") + if len(path) != 3 { + http.NotFound(w, r) + return + } + if path[2] == "new" { + editRadioPage(w, r, 0) + } else if path[2] == "submit" && r.Method == "POST" { + submitRadio(w, r) + } else if path[2] == "delete" && r.Method == "POST" { + deleteRadio(w, r) + } else if path[2] == "" { + radiosPage(w, r) + } else { + id, err := strconv.Atoi(path[2]) + if err != nil { + http.NotFound(w, r) + return + } + editRadioPage(w, r, id) + } +} + +type PlaylistsPageData struct { + Playlists []Playlist +} + +func playlistsPage(w http.ResponseWriter, _ *http.Request) { + data := PlaylistsPageData{ + Playlists: db.GetPlaylists(), + } + tmpl := template.Must(template.ParseFiles("templates/playlists.html")) + err := tmpl.Execute(w, data) + if err != nil { + log.Fatal(err) + } +} + +type RadiosPageData struct { + Radios []Radio +} + +func radiosPage(w http.ResponseWriter, _ *http.Request) { + data := RadiosPageData{ + Radios: db.GetRadios(), + } + tmpl := template.Must(template.ParseFiles("templates/radios.html")) + err := tmpl.Execute(w, data) + if err != nil { + log.Fatal(err) + } +} + +type EditPlaylistPageData struct { + Playlist Playlist + Entries []PlaylistEntry + Files []string +} + +func editPlaylistPage(w http.ResponseWriter, r *http.Request, id int) { + var data EditPlaylistPageData + for _, f := range files.Files() { + data.Files = append(data.Files, f.Name) + } + if id == 0 { + data.Playlist.Enabled = true + data.Playlist.Name = "New Playlist" + data.Playlist.StartTime = time.Now().Format(formatString) + data.Entries = append(data.Entries, PlaylistEntry{}) + } else { + playlist, err := db.GetPlaylist(id) + if err != nil { + http.NotFound(w, r) + return + } + data.Playlist = playlist + data.Entries = db.GetEntriesForPlaylist(id) + } + tmpl := template.Must(template.ParseFiles("templates/playlist.html")) + tmpl.Execute(w, data) +} + +func submitPlaylist(w http.ResponseWriter, r *http.Request) { + err := r.ParseForm() + if err == nil { + var p Playlist + id, err := strconv.Atoi(r.Form.Get("playlistId")) + if err != nil { + return + } + _, err = time.Parse(formatString, r.Form.Get("playlistStartTime")) + if err != nil { + return + } + p.Id = id + p.Enabled = r.Form.Get("playlistEnabled") == "1" + p.Name = r.Form.Get("playlistName") + p.StartTime = r.Form.Get("playlistStartTime") + + delays := r.Form["delaySeconds"] + filenames := r.Form["filename"] + isRelatives := r.Form["isRelative"] + + entries := make([]PlaylistEntry, 0) + for i := range delays { + var e PlaylistEntry + delay, err := strconv.Atoi(delays[i]) + if err != nil { + return + } + e.DelaySeconds = delay + e.Position = i + e.IsRelative = isRelatives[i] == "1" + e.Filename = filenames[i] + entries = append(entries, e) + } + cleanedEntries := make([]PlaylistEntry, 0) + for _, e := range entries { + if e.DelaySeconds != 0 || e.Filename != "" { + cleanedEntries = append(cleanedEntries, e) + } + } + + if id != 0 { + db.UpdatePlaylist(p) + } else { + id = db.CreatePlaylist(p) + } + db.SetEntriesForPlaylist(cleanedEntries, id) + // Notify connected radios + close(playlistChangeWait) + playlistChangeWait = make(chan bool) + } + http.Redirect(w, r, "/playlist/", http.StatusFound) +} + +func deletePlaylist(w http.ResponseWriter, r *http.Request) { + err := r.ParseForm() + if err == nil { + id, err := strconv.Atoi(r.Form.Get("playlistId")) + if err != nil { + return + } + db.DeletePlaylist(id) + } + http.Redirect(w, r, "/playlist/", http.StatusFound) +} + +type EditRadioPageData struct { + Radio Radio +} + +func editRadioPage(w http.ResponseWriter, r *http.Request, id int) { + var data EditRadioPageData + if id == 0 { + data.Radio.Name = "New Radio" + data.Radio.Token = generateSession() + } else { + radio, err := db.GetRadio(id) + if err != nil { + http.NotFound(w, r) + return + } + data.Radio = radio + } + tmpl := template.Must(template.ParseFiles("templates/radio.html")) + tmpl.Execute(w, data) +} + +func submitRadio(w http.ResponseWriter, r *http.Request) { + err := r.ParseForm() + if err == nil { + var radio Radio + id, err := strconv.Atoi(r.Form.Get("radioId")) + if err != nil { + return + } + radio.Id = id + radio.Name = r.Form.Get("radioName") + radio.Token = r.Form.Get("radioToken") + if id != 0 { + db.UpdateRadio(radio) + } else { + db.CreateRadio(radio) + } + } + http.Redirect(w, r, "/radio/", http.StatusFound) +} + +func deleteRadio(w http.ResponseWriter, r *http.Request) { + err := r.ParseForm() + if err == nil { + id, err := strconv.Atoi(r.Form.Get("radioId")) + if err != nil { + return + } + db.DeleteRadio(id) + } + http.Redirect(w, r, "/radio/", http.StatusFound) +} + +type FilesPageData struct { + Files []FileSpec +} + +func filesPage(w http.ResponseWriter, _ *http.Request) { + data := FilesPageData{ + Files: files.Files(), + } + log.Println("file page data", data) + tmpl := template.Must(template.ParseFiles("templates/files.html")) + err := tmpl.Execute(w, data) + if err != nil { + log.Fatal(err) + } +} + +func deleteFile(w http.ResponseWriter, r *http.Request) { + err := r.ParseForm() + if err == nil { + filename := r.Form.Get("filename") + if filename == "" { + return + } + files.Delete(filename) + } + http.Redirect(w, r, "/file/", http.StatusFound) +} + +func uploadFile(w http.ResponseWriter, r *http.Request) { + err := r.ParseMultipartForm(100 << 20) + file, handler, err := r.FormFile("file") + if err == nil { + path := filepath.Join(files.Path(), filepath.Base(handler.Filename)) + f, _ := os.Create(path) + defer f.Close() + io.Copy(f, file) + log.Println("uploaded file to", path) + files.Refresh() + } + http.Redirect(w, r, "/file/", http.StatusFound) +} + +func logOutPage(w http.ResponseWriter, r *http.Request) { + clearSessionCookie(w) + tmpl := template.Must(template.ParseFiles("templates/logout.html")) + tmpl.Execute(w, nil) +} diff --git a/server/config.go b/server/config.go new file mode 100644 index 0000000..4a4866c --- /dev/null +++ b/server/config.go @@ -0,0 +1,45 @@ +package main + +import ( + "errors" + "log" + + "github.com/BurntSushi/toml" +) + +type ServerConfig struct { + BindAddress string + Port int + SqliteDB string + AudioFilesPath string +} + +func NewServerConfig() ServerConfig { + return ServerConfig{ + BindAddress: "0.0.0.0", + Port: 55134, + SqliteDB: "", + AudioFilesPath: "", + } +} + +func (c *ServerConfig) LoadFromFile(path string) { + _, err := toml.DecodeFile(path, &c) + if err != nil { + log.Fatal("could not read config file for reading at path:", path, err) + } + err = c.Validate() + if err != nil { + log.Fatal(err) + } +} + +func (c *ServerConfig) Validate() error { + if c.SqliteDB == "" { + return errors.New("Configuration must provide SqliteDB") + } + if c.AudioFilesPath == "" { + return errors.New("Configuration must provide AudioFilesPath") + } + return nil +} diff --git a/server/database.go b/server/database.go new file mode 100644 index 0000000..e6ce752 --- /dev/null +++ b/server/database.go @@ -0,0 +1,189 @@ +package main + +import ( + "database/sql" + "errors" + "log" + _ "modernc.org/sqlite" + "time" +) + +type Database struct { + sqldb *sql.DB +} + +var db Database + +func InitDatabase() { + sqldb, err := sql.Open("sqlite", config.SqliteDB) + if err != nil { + log.Fatal(err) + } + db.sqldb = sqldb + + _, err = db.sqldb.Exec("PRAGMA foreign_keys = ON") + if err != nil { + log.Printf("%q\n", err) + return + } + + sqlStmt := ` + CREATE TABLE IF NOT EXISTS sessions (id INTEGER PRIMARY KEY AUTOINCREMENT, token TEXT, username TEXT, created TIMESTAMP, expiry TIMESTAMP); + CREATE TABLE IF NOT EXISTS playlists (id INTEGER PRIMARY KEY AUTOINCREMENT, enabled INTEGER, name TEXT, start_time TEXT); + CREATE TABLE IF NOT EXISTS playlist_entries (id INTEGER PRIMARY KEY AUTOINCREMENT, playlist_id INTEGER, position INTEGER, filename TEXT, delay_seconds INTEGER, is_relative INTEGER, CONSTRAINT fk_playlists FOREIGN KEY (playlist_id) REFERENCES playlists(id) ON DELETE CASCADE); + CREATE TABLE IF NOT EXISTS radios (id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT, token TEXT); + ` + _, err = db.sqldb.Exec(sqlStmt) + if err != nil { + log.Printf("%q: %s\n", err, sqlStmt) + return + } +} + +func (d *Database) CloseDatabase() { + d.sqldb.Close() +} + +func (d *Database) InsertSession(user string, token string, expiry time.Time) { + _, err := d.sqldb.Exec("INSERT INTO sessions (token, username, created, expiry) values (?, ?, CURRENT_TIMESTAMP, ?)", token, user, expiry) + if err != nil { + log.Fatal(err) + } +} + +func (d *Database) GetUserForSession(token string) (string, error) { + var username string + err := d.sqldb.QueryRow("SELECT username FROM sessions WHERE token = ? AND expiry > CURRENT_TIMESTAMP", token).Scan(&username) + if err != nil { + return "", errors.New("no matching token") + } + return username, nil +} + +func (d *Database) CreatePlaylist(playlist Playlist) int { + var id int + tx, _ := d.sqldb.Begin() + _, err := tx.Exec("INSERT INTO playlists (enabled, name, start_time) values (?, ?, ?)", playlist.Enabled, playlist.Name, playlist.StartTime) + if err != nil { + log.Fatal(err) + } + err = tx.QueryRow("SELECT last_insert_rowid()").Scan(&id) + if err != nil { + log.Fatal(err) + } + err = tx.Commit() + if err != nil { + log.Fatal(err) + } + return id +} + +func (d *Database) DeletePlaylist(playlistId int) { + d.sqldb.Exec("DELETE FROM playlists WHERE id = ?", playlistId) +} + +func (d *Database) GetPlaylists() []Playlist { + ret := make([]Playlist, 0) + rows, err := d.sqldb.Query("SELECT id, enabled, name, start_time FROM playlists ORDER BY id ASC") + if err != nil { + return ret + } + defer rows.Close() + for rows.Next() { + var p Playlist + if err := rows.Scan(&p.Id, &p.Enabled, &p.Name, &p.StartTime); err != nil { + return ret + } + ret = append(ret, p) + } + return ret +} + +func (d *Database) GetPlaylist(playlistId int) (Playlist, error) { + var p Playlist + err := d.sqldb.QueryRow("SELECT id, enabled, name, start_time FROM playlists WHERE id = ?", playlistId).Scan(&p.Id, &p.Enabled, &p.Name, &p.StartTime) + if err != nil { + return p, err + } + return p, nil +} + +func (d *Database) UpdatePlaylist(playlist Playlist) { + d.sqldb.Exec("UPDATE playlists SET enabled = ?, name = ?, start_time = ? WHERE id = ?", playlist.Enabled, playlist.Name, playlist.StartTime, playlist.Id) +} + +func (d *Database) SetEntriesForPlaylist(entries []PlaylistEntry, playlistId int) { + tx, _ := d.sqldb.Begin() + _, err := tx.Exec("DELETE FROM playlist_entries WHERE playlist_id = ?", playlistId) + for _, e := range entries { + _, err = tx.Exec("INSERT INTO playlist_entries (playlist_id, position, filename, delay_seconds, is_relative) values (?, ?, ?, ?, ?)", playlistId, e.Position, e.Filename, e.DelaySeconds, e.IsRelative) + if err != nil { + log.Fatal(err) + } + } + tx.Commit() // ignore errors +} + +func (d *Database) GetEntriesForPlaylist(playlistId int) []PlaylistEntry { + ret := make([]PlaylistEntry, 0) + rows, err := d.sqldb.Query("SELECT id, position, filename, delay_seconds, is_relative FROM playlist_entries WHERE playlist_id = ? ORDER by position ASC", playlistId) + if err != nil { + return ret + } + defer rows.Close() + for rows.Next() { + var entry PlaylistEntry + if err := rows.Scan(&entry.Id, &entry.Position, &entry.Filename, &entry.DelaySeconds, &entry.IsRelative); err != nil { + return ret + } + ret = append(ret, entry) + } + return ret +} + +func (d *Database) GetRadio(radioId int) (Radio, error) { + var r Radio + err := d.sqldb.QueryRow("SELECT id, name, token FROM radios WHERE id = ?", radioId).Scan(&r.Id, &r.Name, &r.Token) + if err != nil { + return r, err + } + return r, nil +} + +func (d *Database) GetRadioByToken(token string) (Radio, error) { + var r Radio + err := d.sqldb.QueryRow("SELECT id, name, token FROM radios WHERE token = ?", token).Scan(&r.Id, &r.Name, &r.Token) + if err != nil { + return r, err + } + return r, nil +} + +func (d *Database) GetRadios() []Radio { + ret := make([]Radio, 0) + rows, err := d.sqldb.Query("SELECT id, name, token FROM radios ORDER BY id ASC") + if err != nil { + return ret + } + defer rows.Close() + for rows.Next() { + var r Radio + if err := rows.Scan(&r.Id, &r.Name, &r.Token); err != nil { + return ret + } + ret = append(ret, r) + } + return ret +} + +func (d *Database) DeleteRadio(radioId int) { + d.sqldb.Exec("DELETE FROM radios WHERE id = ?", radioId) +} + +func (d *Database) CreateRadio(radio Radio) { + d.sqldb.Exec("INSERT INTO radios (name, token) values (?, ?)", radio.Name, radio.Token) +} + +func (d *Database) UpdateRadio(radio Radio) { + d.sqldb.Exec("UPDATE radios SET name = ?, token = ? WHERE id = ?", radio.Name, radio.Token, radio.Id) +} diff --git a/server/files.go b/server/files.go new file mode 100644 index 0000000..4d6e293 --- /dev/null +++ b/server/files.go @@ -0,0 +1,73 @@ +package main + +import ( + "crypto/sha256" + "encoding/hex" + "io" + "log" + "os" + "path/filepath" +) + +type FileSpec struct { + Name string + Hash string +} + +type AudioFiles struct { + path string + list []FileSpec + changeWait chan bool +} + +var files AudioFiles + +func InitAudioFiles(path string) { + files.changeWait = make(chan bool) + files.path = path + log.Println("initing audio files") + files.Refresh() + log.Println("done") +} + +func (r *AudioFiles) Refresh() { + entries, err := os.ReadDir(r.path) + if err != nil { + log.Println("couldn't read dir", r.path) + return + } + r.list = nil + for _, file := range entries { + f, err := os.Open(filepath.Join(r.path, file.Name())) + if err != nil { + log.Println("couldn't open", file.Name()) + return + } + hash := sha256.New() + io.Copy(hash, f) + r.list = append(r.list, FileSpec{Name: file.Name(), Hash: hex.EncodeToString(hash.Sum(nil))}) + } + log.Println("Files updated", r.list) + close(files.changeWait) + files.changeWait = make(chan bool) +} + +func (r *AudioFiles) Path() string { + return r.path +} + +func (r *AudioFiles) Files() []FileSpec { + return r.list +} + +func (r *AudioFiles) Delete(filename string) { + path := filepath.Join(r.path, filepath.Base(filename)) + if filepath.Clean(r.path) != filepath.Clean(path) { + os.Remove(path) + r.Refresh() + } +} + +func (r *AudioFiles) ChangeChannel() chan bool { + return r.changeWait +} diff --git a/server/model.go b/server/model.go new file mode 100644 index 0000000..94a6ab4 --- /dev/null +++ b/server/model.go @@ -0,0 +1,26 @@ +package main + +type PlaylistEntry struct { + Id int + Position int + Filename string + DelaySeconds int + IsRelative bool +} + +type User struct { + username string +} + +type Playlist struct { + Id int + Enabled bool + Name string + StartTime string +} + +type Radio struct { + Id int + Name string + Token string +} diff --git a/server/radio_sync.go b/server/radio_sync.go new file mode 100644 index 0000000..3dfd4ed --- /dev/null +++ b/server/radio_sync.go @@ -0,0 +1,134 @@ +package main + +import ( + "code.octet-stream.net/broadcaster/protocol" + "encoding/json" + "golang.org/x/net/websocket" + "log" +) + +func RadioSync(ws *websocket.Conn) { + log.Println("A websocket connected, I think") + buf := make([]byte, 16384) + + badRead := false + isAuthenticated := false + var radio Radio + for { + // Ignore any massively oversize messages + n, err := ws.Read(buf) + if err != nil { + if radio.Name != "" { + log.Println("Lost websocket to radio:", radio.Name) + status.RadioDisconnected(radio.Id) + } else { + log.Println("Lost unauthenticated websocket") + } + return + } + if n == len(buf) { + badRead = true + continue + } else if badRead { + badRead = false + continue + } + + t, msg, err := protocol.ParseMessage(buf[:n]) + if err != nil { + log.Println(err) + return + } + + if !isAuthenticated && t != protocol.AuthenticateType { + continue + } + + if t == protocol.AuthenticateType && !isAuthenticated { + authMsg := msg.(protocol.AuthenticateMessage) + r, err := db.GetRadioByToken(authMsg.Token) + if err != nil { + log.Println("Could not find radio for offered token", authMsg.Token) + } + radio = r + log.Println("Radio authenticated:", radio.Name) + isAuthenticated = true + + go KeepFilesUpdated(ws) + + // send initial file message + err = sendFilesMessageToRadio(ws) + if err != nil { + return + } + + go KeepPlaylistsUpdated(ws) + + // send initial playlists message + err = sendPlaylistsMessageToRadio(ws) + if err != nil { + return + } + } + + if t == protocol.StatusType { + statusMsg := msg.(protocol.StatusMessage) + log.Println("Received Status from", radio.Name, ":", statusMsg) + status.MergeStatus(radio.Id, statusMsg) + } + } +} + +func sendPlaylistsMessageToRadio(ws *websocket.Conn) error { + playlistSpecs := make([]protocol.PlaylistSpec, 0) + for _, v := range db.GetPlaylists() { + if v.Enabled { + entrySpecs := make([]protocol.EntrySpec, 0) + for _, e := range db.GetEntriesForPlaylist(v.Id) { + entrySpecs = append(entrySpecs, protocol.EntrySpec{Filename: e.Filename, DelaySeconds: e.DelaySeconds, IsRelative: e.IsRelative}) + } + playlistSpecs = append(playlistSpecs, protocol.PlaylistSpec{Id: v.Id, Name: v.Name, StartTime: v.StartTime, Entries: entrySpecs}) + } + } + playlists := protocol.PlaylistsMessage{ + T: protocol.PlaylistsType, + Playlists: playlistSpecs, + } + msg, _ := json.Marshal(playlists) + _, err := ws.Write(msg) + return err +} + +func KeepPlaylistsUpdated(ws *websocket.Conn) { + for { + <-playlistChangeWait + err := sendPlaylistsMessageToRadio(ws) + if err != nil { + return + } + } +} + +func sendFilesMessageToRadio(ws *websocket.Conn) error { + specs := make([]protocol.FileSpec, 0) + for _, v := range files.Files() { + specs = append(specs, protocol.FileSpec{Name: v.Name, Hash: v.Hash}) + } + files := protocol.FilesMessage{ + T: protocol.FilesType, + Files: specs, + } + msg, _ := json.Marshal(files) + _, err := ws.Write(msg) + return err +} + +func KeepFilesUpdated(ws *websocket.Conn) { + for { + <-files.ChangeChannel() + err := sendFilesMessageToRadio(ws) + if err != nil { + return + } + } +} diff --git a/server/session.go b/server/session.go new file mode 100644 index 0000000..4b4c445 --- /dev/null +++ b/server/session.go @@ -0,0 +1,51 @@ +package main + +import ( + "crypto/rand" + "encoding/hex" + "log" + "net/http" + "time" +) + +func generateSession() string { + b := make([]byte, 32) + _, err := rand.Read(b) + if err != nil { + log.Fatal(err) + } + return hex.EncodeToString(b) +} + +func currentUser(w http.ResponseWriter, r *http.Request) (User, error) { + // todo: check if user actually exists and is allowed to log in + cookie, e := r.Cookie("broadcast_session") + if e != nil { + return User{}, e + } + + username, e := db.GetUserForSession(cookie.Value) + if e != nil { + return User{}, e + } + return User{username: username}, nil +} + +func createSessionCookie(w http.ResponseWriter) { + sess := generateSession() + log.Println("Generated a random session", sess) + expiration := time.Now().Add(365 * 24 * time.Hour) + cookie := http.Cookie{Name: "broadcast_session", Value: sess, Expires: expiration, SameSite: http.SameSiteLaxMode} + db.InsertSession("admin", sess, expiration) + http.SetCookie(w, &cookie) +} + +func clearSessionCookie(w http.ResponseWriter) { + c := &http.Cookie{ + Name: "broadcast_session", + Value: "", + MaxAge: -1, + HttpOnly: true, + } + http.SetCookie(w, c) +} diff --git a/server/status.go b/server/status.go new file mode 100644 index 0000000..accbcc9 --- /dev/null +++ b/server/status.go @@ -0,0 +1,42 @@ +package main + +import ( + "code.octet-stream.net/broadcaster/protocol" +) + +type ServerStatus struct { + statuses map[int]protocol.StatusMessage + changeWait chan bool +} + +var status ServerStatus + +func InitServerStatus() { + status = ServerStatus{ + statuses: make(map[int]protocol.StatusMessage), + changeWait: make(chan bool), + } +} + +func (s *ServerStatus) MergeStatus(radioId int, status protocol.StatusMessage) { + s.statuses[radioId] = status + s.TriggerChange() +} + +func (s *ServerStatus) RadioDisconnected(radioId int) { + delete(s.statuses, radioId) + s.TriggerChange() +} + +func (s *ServerStatus) TriggerChange() { + close(s.changeWait) + s.changeWait = make(chan bool) +} + +func (s *ServerStatus) Statuses() map[int]protocol.StatusMessage { + return s.statuses +} + +func (s *ServerStatus) ChangeChannel() chan bool { + return s.changeWait +} diff --git a/server/web_sync.go b/server/web_sync.go new file mode 100644 index 0000000..e59403d --- /dev/null +++ b/server/web_sync.go @@ -0,0 +1,162 @@ +package main + +import ( + "fmt" + "html/template" + "log" + "sort" + "strconv" + "strings" + + "code.octet-stream.net/broadcaster/protocol" + "golang.org/x/net/websocket" +) + +func WebSync(ws *websocket.Conn) { + log.Println("A web user connected with WebSocket") + buf := make([]byte, 16384) + + badRead := false + isAuthenticated := false + var user string + for { + // Ignore any massively oversize messages + n, err := ws.Read(buf) + if err != nil { + if user != "" { + log.Println("Lost websocket to user:", user) + } else { + log.Println("Lost unauthenticated website websocket") + } + return + } + if n == len(buf) { + badRead = true + continue + } else if badRead { + badRead = false + continue + } + + if !isAuthenticated { + token := string(buf[:n]) + u, err := db.GetUserForSession(token) + if err != nil { + log.Println("Could not find user for offered token", token) + ws.Close() + return + } + user = u + log.Println("User authenticated:", user) + isAuthenticated = true + + go KeepWebUpdated(ws) + + // send initial playlists message + err = sendRadioStatusToWeb(ws) + if err != nil { + return + } + } + } +} + +type WebStatusData struct { + Radios []WebRadioStatus +} + +type WebRadioStatus struct { + Name string + LocalTime string + TimeZone string + ChannelClass string + ChannelState string + Playlist string + File string + Status string + Id string + DisableCancel bool + FilesInSync bool +} + +func sendRadioStatusToWeb(ws *websocket.Conn) error { + webStatuses := make([]WebRadioStatus, 0) + radioStatuses := status.Statuses() + keys := make([]int, 0) + for i := range radioStatuses { + keys = append(keys, i) + } + sort.Ints(keys) + for _, i := range keys { + v := radioStatuses[i] + radio, err := db.GetRadio(i) + if err != nil { + continue + } + var channelClass, channelState string + if v.PTT { + channelClass = "ptt" + channelState = "PTT" + } else if v.COS { + channelClass = "cos" + channelState = "RX" + } else { + channelClass = "clear" + channelState = "CLEAR" + } + var statusText string + var disableCancel bool + if v.Status == protocol.StatusIdle { + statusText = "Idle" + disableCancel = true + } else if v.Status == protocol.StatusDelay { + statusText = fmt.Sprintf("Performing delay before transmit: %ds remain", v.DelaySecondsRemaining) + disableCancel = false + } else if v.Status == protocol.StatusChannelInUse { + statusText = fmt.Sprintf("Waiting for channel to clear: %ds", v.WaitingForChannelSeconds) + disableCancel = false + } else if v.Status == protocol.StatusPlaying { + statusText = fmt.Sprintf("Playing: %d:%02d", v.PlaybackSecondsElapsed/60, v.PlaybackSecondsElapsed%60) + disableCancel = false + } + playlist := v.Playlist + if playlist == "" { + playlist = "-" + } + filename := v.Filename + if filename == "" { + filename = "-" + } + webStatuses = append(webStatuses, WebRadioStatus{ + Name: radio.Name, + LocalTime: v.LocalTime, + TimeZone: v.TimeZone, + ChannelClass: channelClass, + ChannelState: channelState, + Playlist: playlist, + File: filename, + Status: statusText, + Id: strconv.Itoa(i), + DisableCancel: disableCancel, + FilesInSync: v.FilesInSync, + }) + } + data := WebStatusData{ + Radios: webStatuses, + } + buf := new(strings.Builder) + tmpl := template.Must(template.ParseFiles("templates/radios.partial.html")) + tmpl.Execute(buf, data) + _, err := ws.Write([]byte(buf.String())) + return err +} + +func KeepWebUpdated(ws *websocket.Conn) { + for { + <-status.ChangeChannel() + err := sendRadioStatusToWeb(ws) + if err != nil { + return + } + } +} diff --git a/templates/files.html b/templates/files.html new file mode 100644 index 0000000..70d666f --- /dev/null +++ b/templates/files.html @@ -0,0 +1,25 @@ + + + + + + Broadcaster + + +
+

Files! List

+ +

Upload New File

+

+

+ + +
+

+
+ + diff --git a/templates/index.html b/templates/index.html new file mode 100644 index 0000000..5f4d747 --- /dev/null +++ b/templates/index.html @@ -0,0 +1,81 @@ + + + + + + Broadcaster + + + + +
+

Welcome!

+ {{if .LoggedIn}} +

Your username is: {{.Username}}.

+

Log Out

+ {{else}} +

Log In

+ {{end}} +

File Management

+

Playlist Management

+

Radio Management

+

Connected Radios

+
+ Loading... +
+
+ + diff --git a/templates/login.html b/templates/login.html new file mode 100644 index 0000000..56772b9 --- /dev/null +++ b/templates/login.html @@ -0,0 +1,23 @@ + + + + + + Broadcaster Log In + + +
+

Log In

+
+ {{if ne .Error ""}} +

{{.Error}}

+ {{end}} +
+
+
+
+ +
+
+ + diff --git a/templates/logout.html b/templates/logout.html new file mode 100644 index 0000000..b151265 --- /dev/null +++ b/templates/logout.html @@ -0,0 +1,14 @@ + + + + + + Broadcaster Log Out + + +
+

Logged Out

+

Log In again

+
+ + diff --git a/templates/playlist.html b/templates/playlist.html new file mode 100644 index 0000000..88f17b7 --- /dev/null +++ b/templates/playlist.html @@ -0,0 +1,100 @@ + + + + + + Broadcaster + + + +
+

A specific playlist

+

+ {{if .Playlist.Id}} + Edit Playlist + {{else}} + Create New Playlist + {{end}} +

+
+ +

+ +
+

+

+ + +

+

+ + +

+

Playlist Items

+ {{range .Entries}} +

+ Wait until + + seconds from + + then play + + (Delete Item) +

+ {{end}} +

+ Add Item +

+

+ +

+
+ {{if .Playlist.Id}} +

Delete

+
+ +

+ +

+
+ {{end}} + +
+ + diff --git a/templates/playlists.html b/templates/playlists.html new file mode 100644 index 0000000..207d020 --- /dev/null +++ b/templates/playlists.html @@ -0,0 +1,19 @@ + + + + + + Broadcaster + + +
+

Playlists!

+ +

Add New Playlist

+
+ + diff --git a/templates/radio.html b/templates/radio.html new file mode 100644 index 0000000..1c3dde0 --- /dev/null +++ b/templates/radio.html @@ -0,0 +1,43 @@ + + + + + + Broadcaster + + +
+

A specific radio

+

+ {{if .Radio.Id}} + Edit Radio + {{else}} + Register New Radio + {{end}} +

+
+ +

+ + +

+

+ Authentication token: {{.Radio.Token}} + +

+

+ +

+
+ {{if .Radio.Id}} +

Delete

+
+ +

+ +

+
+ {{end}} +
+ + diff --git a/templates/radios.html b/templates/radios.html new file mode 100644 index 0000000..255fbe2 --- /dev/null +++ b/templates/radios.html @@ -0,0 +1,19 @@ + + + + + + Broadcaster + + +
+

Radios

+ +

Register New Radio

+
+ + diff --git a/templates/radios.partial.html b/templates/radios.partial.html new file mode 100644 index 0000000..fb36ca8 --- /dev/null +++ b/templates/radios.partial.html @@ -0,0 +1,82 @@ +{{if .Radios}} +{{range .Radios}} + + + + + + + + + + + + +
+ {{.Name}} +
+ + + + + + + + + + + + + +
+ Local Time + + {{.LocalTime}} +
+ Time Zone + + {{.TimeZone}} +
+ Files In Sync + + {{if .FilesInSync}} Yes {{else}} No {{end}} +
+
+ {{.ChannelState}} + + + + + + + + + + + + + + +
+ Playlist: + + {{.Playlist}} +
+ File: + + {{.File}} +
+ Status: + + {{.Status}} +
+ 		+
+ + +
+
+{{end}} +{{else}} +

There are no radios online.

+{{end}}