forked from dex4er/collectd-json-influxdb-proxy
/
collectd-json-influxdb-proxy.go
257 lines (214 loc) · 5.56 KB
/
collectd-json-influxdb-proxy.go
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package main
import (
stdContext "context"
stdExpvar "expvar"
"flag"
"math"
"net/http"
"os"
"os/signal"
"runtime"
"syscall"
"time"
"github.com/coreos/go-systemd/daemon"
"github.com/gin-contrib/expvar"
"github.com/gin-gonic/gin"
client "github.com/influxdata/influxdb/client/v2"
"github.com/rs/zerolog"
"golang.org/x/crypto/ssh/terminal"
)
const (
appName = "collectd-json-influxdb-proxy"
influxDBdefault = "collectd"
influxURLdefault = "http://localhost:8086/"
serverAddr = ":5826"
)
// ValueLists export
type ValueLists []struct {
Values []float64 `json:"values"`
DsTypes []string `json:"dstypes"`
DsNames []string `json:"dsnames"`
Time float64 `json:"time"`
Interval float64 `json:"interval"`
Host string `json:"host"`
Plugin string `json:"plugin"`
PluginInstance string `json:"plugin_instance"`
Type string `json:"type"`
TypeInstance string `json:"type_instance"`
}
// Response export
type Response struct {
}
func createLogger() zerolog.Logger {
host, _ := os.Hostname()
if terminal.IsTerminal(int(os.Stdout.Fd())) {
return zerolog.New(os.Stdout).With().
Timestamp().
Logger().
Output(zerolog.ConsoleWriter{Out: os.Stderr})
}
return zerolog.New(os.Stdout).With().
Timestamp().
Str("app", appName).
Str("host", host).
Logger()
}
func logRequest(log zerolog.Logger) gin.HandlerFunc {
return func(c *gin.Context) {
t := time.Now()
// process request
c.Next()
latency := time.Since(t)
clientIP := c.ClientIP()
method := c.Request.Method
statusCode := c.Writer.Status()
r := c.Request
errors := c.Errors
event := log.Info().
Str("method", method).
Str("url", r.URL.String()).
Int("status", statusCode).
Int64("size", r.ContentLength).
Str("ip", clientIP).
Dur("latency", latency)
if errors != nil {
event.Str("error", errors.String())
}
event.Msg("Request")
}
}
func proxyData(ctx *gin.Context, log zerolog.Logger, c client.Client, influxDB string) (b client.BatchPoints, e error) {
var valueLists ValueLists
err := ctx.ShouldBindJSON(&valueLists)
if err != nil {
ctx.JSON(http.StatusBadRequest, gin.H{"Error": err.Error()})
log.Error().
Err(err).
Msg(err.Error())
return nil, err
}
bp, _ := client.NewBatchPoints(client.BatchPointsConfig{
Database: influxDB,
})
for _, v := range valueLists {
tags := map[string]string{}
if v.Host != "" {
tags["host"] = v.Host
}
if v.PluginInstance != "" {
tags["plugin_instance"] = v.PluginInstance
}
if v.Type != "" {
tags["type"] = v.Type
}
if v.TypeInstance != "" {
tags["type_instance"] = v.TypeInstance
}
fields := map[string]interface{}{}
for n, vv := range v.Values {
name := v.DsNames[n]
fields[name] = vv
}
s, ms := math.Modf(v.Time)
t := time.Unix(int64(s), int64(ms*1e9))
pt, err := client.NewPoint(
v.Plugin,
tags,
fields,
t,
)
if err != nil {
log.Error().
Err(err).
Msg(err.Error())
continue
}
bp.AddPoint(pt)
}
err = c.Write(bp)
if err != nil {
ctx.JSON(http.StatusInternalServerError, gin.H{"Error": err.Error()})
log.Error().
Err(err).
Msg(err.Error())
return bp, err
}
return bp, nil
}
func main() {
addr := flag.String("address", serverAddr, "server address")
debugVars := flag.Bool("debug-vars", false, "start server for exposer variables")
logRequests := flag.Bool("log-requests", false, "logging every request to the server")
influxURL := flag.String("influx-url", influxURLdefault, "Influx URL")
influxDatabase := flag.String("influx-database", influxDBdefault, "Influx database")
flag.Parse()
log := createLogger()
c, err := client.NewHTTPClient(client.HTTPConfig{
Addr: *influxURL,
})
if err != nil {
log.Fatal().Err(err).Msg("Error creating InfluxDB Client")
} else {
log.Info().Str("url", *influxURL).Msg("Connecting to InfluxDB")
}
defer c.Close()
gin.SetMode(gin.ReleaseMode)
router := gin.New()
router.Use(gin.Recovery())
if *logRequests {
router.Use(logRequest(log))
}
requestsCounter := 0
requestsCounterVar := stdExpvar.NewInt("requests.counter")
router.POST("/", func(ctx *gin.Context) {
requestsCounter++
if *debugVars {
requestsCounterVar.Set(int64(requestsCounter))
}
proxyData(ctx, log, c, *influxDatabase)
response := Response{}
ctx.JSON(http.StatusOK, response)
return
})
if *debugVars {
numGo := stdExpvar.NewInt("runtime.goroutines")
router.GET("/debug/vars", expvar.Handler())
go func() {
tick := time.NewTicker(1 * time.Second)
for {
select {
case <-tick.C:
numGo.Set(int64(runtime.NumGoroutine()))
}
}
}()
}
srv := &http.Server{
Addr: *addr,
Handler: router,
ReadTimeout: 10 * time.Second,
WriteTimeout: 10 * time.Second,
}
// On signal, gracefully shut down the server and wait 5
// seconds for current connections to stop.
done := make(chan struct{})
quit := make(chan os.Signal, 1)
signal.Notify(quit, os.Interrupt, os.Kill, syscall.SIGTERM)
go func() {
<-quit
log.Info().Msg("Server is shutting down")
ctx, cancel := stdContext.WithTimeout(stdContext.Background(), 5*time.Second)
defer cancel()
if err := srv.Shutdown(ctx); err != nil {
log.Fatal().Err(err).Msg("Cannot gracefully shut down the server")
}
close(done)
}()
daemon.SdNotify(false, "READY=1")
log.Info().Str("addr", *addr).Msg("Server is listening")
if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
log.Fatal().Err(err).Msg("Start server listener")
}
// Wait for existing connections before exiting.
<-done
}