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Add support for writing to InfluxDB (evcc-io#8)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,169 @@ | ||
| package server | ||
|
|
||
| import ( | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/andig/evcc/api" | ||
| "github.com/andig/evcc/core" | ||
| influxdb "github.com/influxdata/influxdb1-client/v2" | ||
| ) | ||
|
|
||
| const ( | ||
| influxWriteTimeout = 10 * time.Second | ||
| influxWriteInterval = 30 * time.Second | ||
| precision = "s" | ||
| ) | ||
|
|
||
| // Influx is a influx publisher | ||
| type Influx struct { | ||
| sync.Mutex | ||
| log *api.Logger | ||
| client influxdb.Client | ||
| points []*influxdb.Point | ||
| pointsConf influxdb.BatchPointsConfig | ||
| interval time.Duration | ||
| measurement string | ||
| } | ||
|
|
||
| // NewInfluxClient creates new publisher for influx | ||
| func NewInfluxClient( | ||
| url string, | ||
| database string, | ||
| interval time.Duration, | ||
| user string, | ||
| password string, | ||
| ) *Influx { | ||
| log := api.NewLogger("iflx") | ||
|
|
||
| if database == "" { | ||
| log.FATAL.Fatal("missing database") | ||
| } | ||
| if interval == 0 { | ||
| interval = influxWriteInterval | ||
| } | ||
|
|
||
| client, err := influxdb.NewHTTPClient(influxdb.HTTPConfig{ | ||
| Addr: url, | ||
| Username: user, | ||
| Password: password, | ||
| Timeout: influxWriteTimeout, | ||
| }) | ||
| if err != nil { | ||
| log.FATAL.Fatalf("error creating client: %v", err) | ||
| } | ||
|
|
||
| // check connection | ||
| go func(client influxdb.Client) { | ||
| if _, _, err := client.Ping(influxWriteTimeout); err != nil { | ||
| log.FATAL.Fatalf("%v", err) | ||
| } | ||
| }(client) | ||
|
|
||
| return &Influx{ | ||
| log: log, | ||
| client: client, | ||
| interval: interval, | ||
| pointsConf: influxdb.BatchPointsConfig{ | ||
| Database: database, | ||
| Precision: precision, | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| // writeBatchPoints asynchronously writes the collected points | ||
| func (m *Influx) writeBatchPoints() { | ||
| m.Lock() | ||
|
|
||
| // get current batch | ||
| if len(m.points) == 0 { | ||
| m.Unlock() | ||
| return | ||
| } | ||
|
|
||
| // create new batch | ||
| batch, err := influxdb.NewBatchPoints(m.pointsConf) | ||
| if err != nil { | ||
| m.log.ERROR.Print(err) | ||
| m.Unlock() | ||
| return | ||
| } | ||
|
|
||
| // replace current batch | ||
| points := m.points | ||
| m.points = nil | ||
| m.Unlock() | ||
|
|
||
| // write batch | ||
| batch.AddPoints(points) | ||
| m.log.TRACE.Printf("writing %d point(s)", len(points)) | ||
|
|
||
| if err := m.client.Write(batch); err != nil { | ||
| m.log.ERROR.Print(err) | ||
|
|
||
| // put points back at beginning of next batch | ||
| m.Lock() | ||
| m.points = append(points, m.points...) | ||
| m.Unlock() | ||
| } | ||
| } | ||
|
|
||
| // asyncWriter periodically calls writeBatchPoints | ||
| func (m *Influx) asyncWriter(exit <-chan struct{}) <-chan struct{} { | ||
| done := make(chan struct{}) // signal writer stopped | ||
|
|
||
| // async batch writer | ||
| go func() { | ||
| ticker := time.NewTicker(m.interval) | ||
| for { | ||
| select { | ||
| case <-ticker.C: | ||
| m.writeBatchPoints() | ||
| case <-exit: | ||
| ticker.Stop() | ||
| m.writeBatchPoints() | ||
| close(done) | ||
| return | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| return done | ||
| } | ||
|
|
||
| // Run Influx publisher | ||
| func (m *Influx) Run(in <-chan core.Param) { | ||
| // run async writer | ||
| exit := make(chan struct{}) // exit signals to stop writer | ||
| done := m.asyncWriter(exit) // done signals writer stopped | ||
|
|
||
| // add points to batch for async writing | ||
| for param := range in { | ||
| if _, ok := param.Val.(float64); !ok { | ||
| continue | ||
| } | ||
|
|
||
| p, err := influxdb.NewPoint( | ||
| param.Key, | ||
| map[string]string{}, | ||
| map[string]interface{}{ | ||
| "value": param.Val, | ||
| }, | ||
| time.Now(), | ||
| ) | ||
| if err != nil { | ||
| m.log.ERROR.Printf("failed creating point: %v", err) | ||
| continue | ||
| } | ||
|
|
||
| m.Lock() | ||
| m.points = append(m.points, p) | ||
| m.Unlock() | ||
| } | ||
|
|
||
| // close write loop | ||
| exit <- struct{}{} | ||
| <-done | ||
|
|
||
| m.client.Close() | ||
| } |
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