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Implement server
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DC2729FDD34BE99E
13
go.mod
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13
go.mod
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module github.com/Luzifer/mapshare
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go 1.13
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require (
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github.com/Luzifer/rconfig/v2 v2.2.1
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github.com/gofrs/uuid v3.2.0+incompatible
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github.com/gorilla/mux v1.7.3
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github.com/gorilla/websocket v1.4.1
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github.com/konsorten/go-windows-terminal-sequences v1.0.2 // indirect
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github.com/sirupsen/logrus v1.4.2
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golang.org/x/sys v0.0.0-20200106162015-b016eb3dc98e // indirect
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)
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30
go.sum
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30
go.sum
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github.com/Luzifer/rconfig v2.2.0+incompatible h1:Kle3+rshPM7LxciOheaR4EfHUzibkDDGws04sefQ5m8=
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github.com/Luzifer/rconfig/v2 v2.2.1 h1:zcDdLQlnlzwcBJ8E0WFzOkQE1pCMn3EbX0dFYkeTczg=
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github.com/Luzifer/rconfig/v2 v2.2.1/go.mod h1:OKIX0/JRZrPJ/ZXXWklQEFXA6tBfWaljZbW37w+sqBw=
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github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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github.com/gofrs/uuid v3.2.0+incompatible h1:y12jRkkFxsd7GpqdSZ+/KCs/fJbqpEXSGd4+jfEaewE=
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github.com/gofrs/uuid v3.2.0+incompatible/go.mod h1:b2aQJv3Z4Fp6yNu3cdSllBxTCLRxnplIgP/c0N/04lM=
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github.com/gorilla/mux v1.7.3 h1:gnP5JzjVOuiZD07fKKToCAOjS0yOpj/qPETTXCCS6hw=
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github.com/gorilla/mux v1.7.3/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
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github.com/gorilla/websocket v1.4.1 h1:q7AeDBpnBk8AogcD4DSag/Ukw/KV+YhzLj2bP5HvKCM=
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github.com/gorilla/websocket v1.4.1/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
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github.com/konsorten/go-windows-terminal-sequences v1.0.1 h1:mweAR1A6xJ3oS2pRaGiHgQ4OO8tzTaLawm8vnODuwDk=
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github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
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github.com/konsorten/go-windows-terminal-sequences v1.0.2 h1:DB17ag19krx9CFsz4o3enTrPXyIXCl+2iCXH/aMAp9s=
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github.com/konsorten/go-windows-terminal-sequences v1.0.2/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
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github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
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github.com/sirupsen/logrus v1.4.2 h1:SPIRibHv4MatM3XXNO2BJeFLZwZ2LvZgfQ5+UNI2im4=
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github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
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github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=
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github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
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github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
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github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
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golang.org/x/sys v0.0.0-20190422165155-953cdadca894 h1:Cz4ceDQGXuKRnVBDTS23GTn/pU5OE2C0WrNTOYK1Uuc=
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golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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golang.org/x/sys v0.0.0-20200106162015-b016eb3dc98e h1:LwyF2AFISC9nVbS6MgzsaQNSUsRXI49GS+YQ5KX/QH0=
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golang.org/x/sys v0.0.0-20200106162015-b016eb3dc98e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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gopkg.in/validator.v2 v2.0.0-20180514200540-135c24b11c19 h1:WB265cn5OpO+hK3pikC9hpP1zI/KTwmyMFKloW9eOVc=
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gopkg.in/validator.v2 v2.0.0-20180514200540-135c24b11c19/go.mod h1:o4V0GXN9/CAmCsvJ0oXYZvrZOe7syiDZSN1GWGZTGzc=
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gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
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gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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121
handler.go
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121
handler.go
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package main
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import (
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"encoding/json"
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"net/http"
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"sync"
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"time"
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"github.com/gofrs/uuid"
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"github.com/gorilla/mux"
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"github.com/gorilla/websocket"
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log "github.com/sirupsen/logrus"
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)
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type position struct {
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Lat float64 `json:"lat"`
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Lon float64 `json:"lon"`
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Retained bool `json:"retained"`
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Time time.Time `json:"time"`
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}
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var (
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reqDistributors = map[string]map[string]chan position{}
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reqDistributorsLock = new(sync.RWMutex)
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reqRetainer = map[string]position{}
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reqRetainerLock = new(sync.RWMutex)
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upgrader = websocket.Upgrader{
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ReadBufferSize: 1024,
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WriteBufferSize: 1024,
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}
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)
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func handleRedirectRandom(w http.ResponseWriter, r *http.Request) {
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http.Redirect(w, r, uuid.Must(uuid.NewV4()).String(), http.StatusFound)
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}
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func handleMapFrontend(w http.ResponseWriter, r *http.Request) {
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http.ServeFile(w, r, "frontend/index.html")
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}
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func handleMapSocket(w http.ResponseWriter, r *http.Request) {
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var (
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vars = mux.Vars(r)
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mapID = vars["mapID"]
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sockID = uuid.Must(uuid.NewV4()).String()
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updates = make(chan position, 10)
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)
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// Register update channel
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reqDistributorsLock.Lock()
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if _, ok := reqDistributors[mapID]; !ok {
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reqDistributors[mapID] = make(map[string]chan position)
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}
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reqDistributors[mapID][sockID] = updates
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reqDistributorsLock.Unlock()
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// In case a retained position is available queue it
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reqRetainerLock.RLock()
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if p, ok := reqRetainer[mapID]; ok {
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updates <- p
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}
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reqRetainerLock.RUnlock()
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// Queue deregistration
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defer func() {
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reqDistributorsLock.Lock()
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defer reqDistributorsLock.Unlock()
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delete(reqDistributors[mapID], sockID)
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close(updates)
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}()
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// Open socket
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conn, err := upgrader.Upgrade(w, r, nil)
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if err != nil {
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log.WithError(err).Debug("Unable to open websocket")
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return
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}
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defer conn.Close()
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// Send updates
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for pos := range updates {
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if err = conn.WriteJSON(pos); err != nil {
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log.WithError(err).Debug("Unable to send position")
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return
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}
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}
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}
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func handleMapSubmit(w http.ResponseWriter, r *http.Request) {
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var (
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pos position
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vars = mux.Vars(r)
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mapID = vars["mapID"]
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)
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if err := json.NewDecoder(r.Body).Decode(&pos); err != nil {
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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if pos.Retained {
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reqRetainerLock.Lock()
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reqRetainer[mapID] = pos
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reqRetainerLock.Unlock()
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}
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reqDistributorsLock.RLock()
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defer reqDistributorsLock.RUnlock()
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distributors, ok := reqDistributors[mapID]
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if !ok || len(distributors) == 0 {
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// No subscribers at all
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return
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}
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for _, c := range distributors {
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c <- pos
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}
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}
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55
main.go
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55
main.go
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package main
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import (
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"fmt"
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"net/http"
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"os"
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"github.com/gorilla/mux"
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log "github.com/sirupsen/logrus"
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"github.com/Luzifer/rconfig/v2"
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)
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var (
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cfg = struct {
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Listen string `flag:"listen" default:":3000" description:"Port/IP to listen on"`
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LogLevel string `flag:"log-level" default:"info" description:"Log level (debug, info, warn, error, fatal)"`
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VersionAndExit bool `flag:"version" default:"false" description:"Prints current version and exits"`
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}{}
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version = "dev"
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)
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func init() {
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if err := rconfig.ParseAndValidate(&cfg); err != nil {
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log.Fatalf("Unable to parse commandline options: %s", err)
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}
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if cfg.VersionAndExit {
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fmt.Printf("mapshare %s\n", version)
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os.Exit(0)
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}
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if l, err := log.ParseLevel(cfg.LogLevel); err != nil {
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log.WithError(err).Fatal("Unable to parse log level")
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} else {
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log.SetLevel(l)
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}
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}
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func main() {
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r := mux.NewRouter()
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r.HandleFunc("/", handleRedirectRandom).Methods(http.MethodGet)
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r.PathPrefix("/asset/").Handler(
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http.StripPrefix("/asset/", http.FileServer(http.Dir("frontend"))),
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).Methods(http.MethodGet)
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r.HandleFunc("/{mapID}", handleMapFrontend).Methods(http.MethodGet)
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r.HandleFunc("/{mapID}", handleMapSubmit).Methods(http.MethodPut)
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r.HandleFunc("/{mapID}/ws", handleMapSocket).Methods(http.MethodGet)
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log.WithError(http.ListenAndServe(cfg.Listen, r)).Error("HTTP server caused an error")
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}
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