traefik/metrics/influxdb.go
2018-11-14 10:18:03 +01:00

213 lines
7.2 KiB
Go

package metrics
import (
"bytes"
"context"
"fmt"
"net/url"
"regexp"
"time"
"github.com/containous/traefik/log"
"github.com/containous/traefik/safe"
"github.com/containous/traefik/types"
kitlog "github.com/go-kit/kit/log"
"github.com/go-kit/kit/metrics/influx"
influxdb "github.com/influxdata/influxdb/client/v2"
)
var influxDBClient *influx.Influx
type influxDBWriter struct {
buf bytes.Buffer
config *types.InfluxDB
}
var influxDBTicker *time.Ticker
const (
influxDBMetricsBackendReqsName = "traefik.backend.requests.total"
influxDBMetricsBackendLatencyName = "traefik.backend.request.duration"
influxDBRetriesTotalName = "traefik.backend.retries.total"
influxDBConfigReloadsName = "traefik.config.reload.total"
influxDBConfigReloadsFailureName = influxDBConfigReloadsName + ".failure"
influxDBLastConfigReloadSuccessName = "traefik.config.reload.lastSuccessTimestamp"
influxDBLastConfigReloadFailureName = "traefik.config.reload.lastFailureTimestamp"
influxDBEntrypointReqsName = "traefik.entrypoint.requests.total"
influxDBEntrypointReqDurationName = "traefik.entrypoint.request.duration"
influxDBEntrypointOpenConnsName = "traefik.entrypoint.connections.open"
influxDBOpenConnsName = "traefik.backend.connections.open"
influxDBServerUpName = "traefik.backend.server.up"
)
const (
protocolHTTP = "http"
protocolUDP = "udp"
)
// RegisterInfluxDB registers the metrics pusher if this didn't happen yet and creates a InfluxDB Registry instance.
func RegisterInfluxDB(ctx context.Context, config *types.InfluxDB) Registry {
if influxDBClient == nil {
influxDBClient = initInfluxDBClient(ctx, config)
}
if influxDBTicker == nil {
influxDBTicker = initInfluxDBTicker(ctx, config)
}
return &standardRegistry{
enabled: true,
configReloadsCounter: influxDBClient.NewCounter(influxDBConfigReloadsName),
configReloadsFailureCounter: influxDBClient.NewCounter(influxDBConfigReloadsFailureName),
lastConfigReloadSuccessGauge: influxDBClient.NewGauge(influxDBLastConfigReloadSuccessName),
lastConfigReloadFailureGauge: influxDBClient.NewGauge(influxDBLastConfigReloadFailureName),
entrypointReqsCounter: influxDBClient.NewCounter(influxDBEntrypointReqsName),
entrypointReqDurationHistogram: influxDBClient.NewHistogram(influxDBEntrypointReqDurationName),
entrypointOpenConnsGauge: influxDBClient.NewGauge(influxDBEntrypointOpenConnsName),
backendReqsCounter: influxDBClient.NewCounter(influxDBMetricsBackendReqsName),
backendReqDurationHistogram: influxDBClient.NewHistogram(influxDBMetricsBackendLatencyName),
backendRetriesCounter: influxDBClient.NewCounter(influxDBRetriesTotalName),
backendOpenConnsGauge: influxDBClient.NewGauge(influxDBOpenConnsName),
backendServerUpGauge: influxDBClient.NewGauge(influxDBServerUpName),
}
}
// initInfluxDBTicker creates a influxDBClient
func initInfluxDBClient(ctx context.Context, config *types.InfluxDB) *influx.Influx {
logger := log.FromContext(ctx)
// TODO deprecated: move this switch into configuration.SetEffectiveConfiguration when web provider will be removed.
switch config.Protocol {
case protocolUDP:
if len(config.Database) > 0 || len(config.RetentionPolicy) > 0 {
logger.Warn("Database and RetentionPolicy options have no effect with UDP.")
config.Database = ""
config.RetentionPolicy = ""
}
case protocolHTTP:
if u, err := url.Parse(config.Address); err == nil {
if u.Scheme != "http" && u.Scheme != "https" {
logger.Warnf("InfluxDB address %s should specify a scheme (http or https): falling back on HTTP.", config.Address)
config.Address = "http://" + config.Address
}
} else {
logger.Errorf("Unable to parse the InfluxDB address %v: falling back on UDP.", err)
config.Protocol = protocolUDP
config.Database = ""
config.RetentionPolicy = ""
}
default:
logger.Warnf("Unsupported protocol %s: falling back on UDP.", config.Protocol)
config.Protocol = protocolUDP
config.Database = ""
config.RetentionPolicy = ""
}
return influx.New(
map[string]string{},
influxdb.BatchPointsConfig{
Database: config.Database,
RetentionPolicy: config.RetentionPolicy,
},
kitlog.LoggerFunc(func(keyvals ...interface{}) error {
log.WithoutContext().WithField(log.MetricsProviderName, "influxdb").Info(keyvals)
return nil
}))
}
// initInfluxDBTicker initializes metrics pusher
func initInfluxDBTicker(ctx context.Context, config *types.InfluxDB) *time.Ticker {
pushInterval, err := time.ParseDuration(config.PushInterval)
if err != nil {
log.FromContext(ctx).Warnf("Unable to parse %s from config.PushInterval: using 10s as the default value", config.PushInterval)
pushInterval = 10 * time.Second
}
report := time.NewTicker(pushInterval)
safe.Go(func() {
var buf bytes.Buffer
influxDBClient.WriteLoop(report.C, &influxDBWriter{buf: buf, config: config})
})
return report
}
// StopInfluxDB stops internal influxDBTicker which controls the pushing of metrics to InfluxDB Agent and resets it to `nil`
func StopInfluxDB() {
if influxDBTicker != nil {
influxDBTicker.Stop()
}
influxDBTicker = nil
}
// Write creates a http or udp client and attempts to write BatchPoints.
// If a "database not found" error is encountered, a CREATE DATABASE
// query is attempted when using protocol http.
func (w *influxDBWriter) Write(bp influxdb.BatchPoints) error {
c, err := w.initWriteClient()
if err != nil {
return err
}
defer c.Close()
if writeErr := c.Write(bp); writeErr != nil {
ctx := log.With(context.Background(), log.Str(log.MetricsProviderName, "influxdb"))
log.FromContext(ctx).Errorf("Error while writing to InfluxDB: %s", writeErr.Error())
if handleErr := w.handleWriteError(ctx, c, writeErr); handleErr != nil {
return handleErr
}
// Retry write after successful handling of writeErr
return c.Write(bp)
}
return nil
}
func (w *influxDBWriter) initWriteClient() (influxdb.Client, error) {
if w.config.Protocol == "http" {
return influxdb.NewHTTPClient(influxdb.HTTPConfig{
Addr: w.config.Address,
Username: w.config.Username,
Password: w.config.Password,
})
}
return influxdb.NewUDPClient(influxdb.UDPConfig{
Addr: w.config.Address,
})
}
func (w *influxDBWriter) handleWriteError(ctx context.Context, c influxdb.Client, writeErr error) error {
if w.config.Protocol != protocolHTTP {
return writeErr
}
match, matchErr := regexp.MatchString("database not found", writeErr.Error())
if matchErr != nil || !match {
return writeErr
}
qStr := fmt.Sprintf("CREATE DATABASE \"%s\"", w.config.Database)
if w.config.RetentionPolicy != "" {
qStr = fmt.Sprintf("%s WITH NAME \"%s\"", qStr, w.config.RetentionPolicy)
}
logger := log.FromContext(ctx)
logger.Debugf("InfluxDB database not found: attempting to create one with %s", qStr)
q := influxdb.NewQuery(qStr, "", "")
response, queryErr := c.Query(q)
if queryErr == nil && response.Error() != nil {
queryErr = response.Error()
}
if queryErr != nil {
logger.Errorf("Error while creating the InfluxDB database %s", queryErr)
return queryErr
}
logger.Debugf("Successfully created the InfluxDB database %s", w.config.Database)
return nil
}