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receive.go
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receive.go
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package main
import (
"context"
"fmt"
"net"
"os"
"strings"
"time"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/oklog/run"
opentracing "github.com/opentracing/opentracing-go"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/storage/tsdb"
"github.com/prometheus/prometheus/tsdb/labels"
"github.com/thanos-io/thanos/pkg/block/metadata"
"github.com/thanos-io/thanos/pkg/component"
"github.com/thanos-io/thanos/pkg/objstore/client"
"github.com/thanos-io/thanos/pkg/prober"
"github.com/thanos-io/thanos/pkg/receive"
"github.com/thanos-io/thanos/pkg/runutil"
"github.com/thanos-io/thanos/pkg/shipper"
"github.com/thanos-io/thanos/pkg/store"
"google.golang.org/grpc"
kingpin "gopkg.in/alecthomas/kingpin.v2"
)
func registerReceive(m map[string]setupFunc, app *kingpin.Application) {
comp := component.Receive
cmd := app.Command(comp.String(), "Accept Prometheus remote write API requests and write to local tsdb (EXPERIMENTAL, this may change drastically without notice)")
grpcBindAddr, cert, key, clientCA := regGRPCFlags(cmd)
httpBindAddr := regHTTPAddrFlag(cmd)
remoteWriteAddress := cmd.Flag("remote-write.address", "Address to listen on for remote write requests.").
Default("0.0.0.0:19291").String()
dataDir := cmd.Flag("tsdb.path", "Data directory of TSDB.").
Default("./data").String()
labelStrs := cmd.Flag("label", "External labels to announce. This flag will be removed in the future when handling multiple tsdb instances is added.").PlaceHolder("key=\"value\"").Strings()
objStoreConfig := regCommonObjStoreFlags(cmd, "", false)
retention := modelDuration(cmd.Flag("tsdb.retention", "How long to retain raw samples on local storage. 0d - disables this retention").Default("15d"))
hashringsFile := cmd.Flag("receive.hashrings-file", "Path to file that contains the hashring configuration.").
PlaceHolder("<path>").String()
refreshInterval := modelDuration(cmd.Flag("receive.hashrings-file-refresh-interval", "Refresh interval to re-read the hashring configuration file. (used as a fallback)").
Default("5m"))
local := cmd.Flag("receive.local-endpoint", "Endpoint of local receive node. Used to identify the local node in the hashring configuration.").String()
tenantHeader := cmd.Flag("receive.tenant-header", "HTTP header to determine tenant for write requests.").Default("THANOS-TENANT").String()
replicaHeader := cmd.Flag("receive.replica-header", "HTTP header specifying the replica number of a write request.").Default("THANOS-REPLICA").String()
replicationFactor := cmd.Flag("receive.replication-factor", "How many times to replicate incoming write requests.").Default("1").Uint64()
tsdbBlockDuration := modelDuration(cmd.Flag("tsdb.block-duration", "Duration for local TSDB blocks").Default("2h").Hidden())
m[comp.String()] = func(g *run.Group, logger log.Logger, reg *prometheus.Registry, tracer opentracing.Tracer, _ bool) error {
lset, err := parseFlagLabels(*labelStrs)
if err != nil {
return errors.Wrap(err, "parse labels")
}
var cw *receive.ConfigWatcher
if *hashringsFile != "" {
cw, err = receive.NewConfigWatcher(log.With(logger, "component", "config-watcher"), reg, *hashringsFile, *refreshInterval)
if err != nil {
return err
}
}
// Local is empty, so try to generate a local endpoint
// based on the hostname and the listening port.
if *local == "" {
hostname, err := os.Hostname()
if hostname == "" || err != nil {
return errors.New("--receive.local-endpoint is empty and host could not be determined.")
}
parts := strings.Split(*remoteWriteAddress, ":")
port := parts[len(parts)-1]
*local = fmt.Sprintf("http://%s:%s/api/v1/receive", hostname, port)
}
return runReceive(
g,
logger,
reg,
tracer,
*grpcBindAddr,
*cert,
*key,
*clientCA,
*httpBindAddr,
*remoteWriteAddress,
*dataDir,
objStoreConfig,
lset,
*retention,
cw,
*local,
*tenantHeader,
*replicaHeader,
*replicationFactor,
*tsdbBlockDuration,
comp,
)
}
}
func runReceive(
g *run.Group,
logger log.Logger,
reg *prometheus.Registry,
tracer opentracing.Tracer,
grpcBindAddr string,
cert string,
key string,
clientCA string,
httpBindAddr string,
remoteWriteAddress string,
dataDir string,
objStoreConfig *pathOrContent,
lset labels.Labels,
retention model.Duration,
cw *receive.ConfigWatcher,
endpoint string,
tenantHeader string,
replicaHeader string,
replicationFactor uint64,
tsdbBlockDuration model.Duration,
comp component.Component,
) error {
logger = log.With(logger, "component", "receive")
level.Warn(logger).Log("msg", "setting up receive; the Thanos receive component is EXPERIMENTAL, it may break significantly without notice")
tsdbCfg := &tsdb.Options{
RetentionDuration: retention,
NoLockfile: true,
MinBlockDuration: tsdbBlockDuration,
MaxBlockDuration: tsdbBlockDuration,
WALCompression: true,
}
localStorage := &tsdb.ReadyStorage{}
receiver := receive.NewWriter(log.With(logger, "component", "receive-writer"), localStorage)
webHandler := receive.NewHandler(log.With(logger, "component", "receive-handler"), &receive.Options{
Receiver: receiver,
ListenAddress: remoteWriteAddress,
Registry: reg,
ReadyStorage: localStorage,
Endpoint: endpoint,
TenantHeader: tenantHeader,
ReplicaHeader: replicaHeader,
ReplicationFactor: replicationFactor,
})
statusProber := prober.NewProber(comp, logger, prometheus.WrapRegistererWithPrefix("thanos_", reg))
// Start all components while we wait for TSDB to open but only load
// initial config and mark ourselves as ready after it completed.
dbOpen := make(chan struct{})
level.Debug(logger).Log("msg", "setting up tsdb")
{
// TSDB.
cancel := make(chan struct{})
g.Add(
func() error {
level.Info(logger).Log("msg", "starting TSDB ...")
db, err := tsdb.Open(
dataDir,
log.With(logger, "component", "tsdb"),
reg,
tsdbCfg,
)
if err != nil {
close(dbOpen)
return fmt.Errorf("opening storage failed: %s", err)
}
level.Info(logger).Log("msg", "tsdb started")
startTimeMargin := int64(2 * time.Duration(tsdbCfg.MinBlockDuration).Seconds() * 1000)
localStorage.Set(db, startTimeMargin)
webHandler.StorageReady()
level.Info(logger).Log("msg", "server is ready to receive web requests.")
close(dbOpen)
<-cancel
return nil
},
func(err error) {
if err := localStorage.Close(); err != nil {
level.Error(logger).Log("msg", "error stopping storage", "err", err)
}
close(cancel)
},
)
}
hashringReady := make(chan struct{})
level.Debug(logger).Log("msg", "setting up hashring")
{
updates := make(chan receive.Hashring)
if cw != nil {
ctx, cancel := context.WithCancel(context.Background())
g.Add(func() error {
receive.HashringFromConfig(ctx, updates, cw)
return nil
}, func(error) {
cancel()
close(updates)
})
} else {
cancel := make(chan struct{})
g.Add(func() error {
updates <- receive.SingleNodeHashring(endpoint)
<-cancel
return nil
}, func(error) {
close(cancel)
close(updates)
})
}
cancel := make(chan struct{})
g.Add(
func() error {
select {
case h := <-updates:
close(hashringReady)
webHandler.Hashring(h)
statusProber.SetReady()
case <-cancel:
close(hashringReady)
return nil
}
select {
// If any new hashring is received, then mark the handler as unready, but keep it alive.
case <-updates:
msg := "hashring has changed; server is not ready to receive web requests."
webHandler.Hashring(nil)
statusProber.SetNotReady(errors.New(msg))
level.Info(logger).Log("msg", msg)
case <-cancel:
return nil
}
<-cancel
return nil
},
func(err error) {
close(cancel)
},
)
}
level.Debug(logger).Log("msg", "setting up http server")
// Initiate HTTP listener providing metrics endpoint and readiness/liveness probes.
if err := scheduleHTTPServer(g, logger, reg, statusProber, httpBindAddr, nil, comp); err != nil {
return errors.Wrap(err, "schedule HTTP server with probes")
}
level.Debug(logger).Log("msg", "setting up grpc server")
{
var (
s *grpc.Server
l net.Listener
err error
)
g.Add(func() error {
<-dbOpen
l, err = net.Listen("tcp", grpcBindAddr)
if err != nil {
return errors.Wrap(err, "listen API address")
}
db := localStorage.Get()
tsdbStore := store.NewTSDBStore(log.With(logger, "component", "thanos-tsdb-store"), reg, db, component.Receive, lset)
opts, err := defaultGRPCServerOpts(logger, cert, key, clientCA)
if err != nil {
return errors.Wrap(err, "setup gRPC server")
}
s := newStoreGRPCServer(logger, reg, tracer, tsdbStore, opts)
// Wait hashring to be ready before start serving metrics
<-hashringReady
level.Info(logger).Log("msg", "listening for StoreAPI gRPC", "address", grpcBindAddr)
return errors.Wrap(s.Serve(l), "serve gRPC")
}, func(error) {
if s != nil {
s.Stop()
}
})
}
level.Debug(logger).Log("msg", "setting up receive http handler")
{
g.Add(
func() error {
return errors.Wrap(webHandler.Run(), "error starting web server")
},
func(err error) {
webHandler.Close()
},
)
}
confContentYaml, err := objStoreConfig.Content()
if err != nil {
return err
}
upload := true
if len(confContentYaml) == 0 {
level.Info(logger).Log("msg", "No supported bucket was configured, uploads will be disabled")
upload = false
}
if upload {
// The background shipper continuously scans the data directory and uploads
// new blocks to Google Cloud Storage or an S3-compatible storage service.
bkt, err := client.NewBucket(logger, confContentYaml, reg, component.Sidecar.String())
if err != nil {
return err
}
// Ensure we close up everything properly.
defer func() {
if err != nil {
runutil.CloseWithLogOnErr(logger, bkt, "bucket client")
}
}()
s := shipper.New(logger, reg, dataDir, bkt, func() labels.Labels { return lset }, metadata.ReceiveSource)
ctx, cancel := context.WithCancel(context.Background())
g.Add(func() error {
defer runutil.CloseWithLogOnErr(logger, bkt, "bucket client")
return runutil.Repeat(30*time.Second, ctx.Done(), func() error {
if uploaded, err := s.Sync(ctx); err != nil {
level.Warn(logger).Log("err", err, "uploaded", uploaded)
}
return nil
})
}, func(error) {
cancel()
})
}
level.Info(logger).Log("msg", "starting receiver")
return nil
}