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cmd.go
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cmd.go
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// Copyright (c) 2016-2019 Uber Technologies, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cmd
import (
"flag"
"github.com/uber/kraken/lib/healthcheck"
"github.com/uber/kraken/lib/upstream"
"github.com/uber/kraken/metrics"
"github.com/uber/kraken/nginx"
"github.com/uber/kraken/origin/blobclient"
"github.com/uber/kraken/tracker/originstore"
"github.com/uber/kraken/tracker/peerhandoutpolicy"
"github.com/uber/kraken/tracker/peerstore"
"github.com/uber/kraken/tracker/trackerserver"
"github.com/uber/kraken/utils/configutil"
"github.com/uber/kraken/utils/log"
"github.com/andres-erbsen/clock"
"github.com/uber-go/tally"
"go.uber.org/zap"
)
// Flags define tracker CLI flags.
type Flags struct {
Port int
ConfigFile string
KrakenCluster string
SecretsFile string
}
// ParseFlags parses tracker CLI flags.
func ParseFlags() *Flags {
var flags Flags
flag.IntVar(
&flags.Port, "port", 0, "port to listen on")
flag.StringVar(
&flags.ConfigFile, "config", "", "configuration file path")
flag.StringVar(
&flags.KrakenCluster, "cluster", "", "cluster name (e.g. prod01-zone1)")
flag.StringVar(
&flags.SecretsFile, "secrets", "", "path to a secrets YAML file to load into configuration")
flag.Parse()
return &flags
}
type options struct {
config *Config
metrics tally.Scope
logger *zap.Logger
}
// Option defines an optional Run parameter.
type Option func(*options)
// WithConfig ignores config/secrets flags and directly uses the provided config
// struct.
func WithConfig(c Config) Option {
return func(o *options) { o.config = &c }
}
// WithMetrics ignores metrics config and directly uses the provided tally scope.
func WithMetrics(s tally.Scope) Option {
return func(o *options) { o.metrics = s }
}
// WithLogger ignores logging config and directly uses the provided logger.
func WithLogger(l *zap.Logger) Option {
return func(o *options) { o.logger = l }
}
// Run runs the tracker.
func Run(flags *Flags, opts ...Option) {
var overrides options
for _, o := range opts {
o(&overrides)
}
var config Config
if overrides.config != nil {
config = *overrides.config
} else {
if err := configutil.Load(flags.ConfigFile, &config); err != nil {
panic(err)
}
if flags.SecretsFile != "" {
if err := configutil.Load(flags.SecretsFile, &config); err != nil {
panic(err)
}
}
}
if overrides.logger != nil {
log.SetGlobalLogger(overrides.logger.Sugar())
} else {
zlog := log.ConfigureLogger(config.ZapLogging)
defer zlog.Sync()
}
stats := overrides.metrics
if stats == nil {
s, closer, err := metrics.New(config.Metrics, flags.KrakenCluster)
if err != nil {
log.Fatalf("Failed to init metrics: %s", err)
}
stats = s
defer closer.Close()
}
go metrics.EmitVersion(stats)
peerStore, err := peerstore.NewRedisStore(config.PeerStore.Redis, clock.New())
if err != nil {
log.Fatalf("Could not create PeerStore: %s", err)
}
tls, err := config.TLS.BuildClient()
if err != nil {
log.Fatalf("Error building client tls config: %s", err)
}
origins, err := config.Origin.Build(upstream.WithHealthCheck(healthcheck.Default(tls)))
if err != nil {
log.Fatalf("Error building origin host list: %s", err)
}
originStore := originstore.New(
config.OriginStore, clock.New(), origins, blobclient.NewProvider(blobclient.WithTLS(tls)))
policy, err := peerhandoutpolicy.NewPriorityPolicy(stats, config.PeerHandoutPolicy.Priority)
if err != nil {
log.Fatalf("Could not load peer handout policy: %s", err)
}
r := blobclient.NewClientResolver(blobclient.NewProvider(blobclient.WithTLS(tls)), origins)
originCluster := blobclient.NewClusterClient(r)
server := trackerserver.New(
config.TrackerServer, stats, policy, peerStore, originStore, originCluster)
go func() {
log.Fatal(server.ListenAndServe())
}()
log.Info("Starting nginx...")
log.Fatal(nginx.Run(config.Nginx, map[string]interface{}{
"port": flags.Port,
"server": nginx.GetServer(
config.TrackerServer.Listener.Net, config.TrackerServer.Listener.Addr)},
nginx.WithTLS(config.TLS)))
}