func main() {
// Flag domain.
fs := pflag.NewFlagSet("default", pflag.ExitOnError)
fs.Usage = func() {
fmt.Fprintf(os.Stderr, "DESCRIPTION\n")
fmt.Fprintf(os.Stderr, " fluxd is the agent of flux.\n")
fmt.Fprintf(os.Stderr, "\n")
fmt.Fprintf(os.Stderr, "FLAGS\n")
fs.PrintDefaults()
}
// This mirrors how kubectl extracts information from the environment.
var (
listenAddr = fs.StringP("listen", "l", ":3031", "Listen address where /metrics will be served")
fluxsvcAddress = fs.String("fluxsvc-address", "wss://cloud.weave.works/api/flux", "Address of the fluxsvc to connect to.")
token = fs.String("token", "", "Token to use to authenticate with flux service")
kubernetesKubectl = fs.String("kubernetes-kubectl", "", "Optional, explicit path to kubectl tool")
)
fs.Parse(os.Args)
// Logger component.
var logger log.Logger
{
logger = log.NewLogfmtLogger(os.Stderr)
logger = log.NewContext(logger).With("ts", log.DefaultTimestampUTC)
logger = log.NewContext(logger).With("caller", log.DefaultCaller)
}
// Platform component.
var k8s platform.Platform
{
restClientConfig, err := restclient.InClusterConfig()
if err != nil {
logger.Log("err", err)
os.Exit(1)
}
// When adding a new platform, don't just bash it in. Create a Platform
// or Cluster interface in package platform, and have kubernetes.Cluster
// and your new platform implement that interface.
logger := log.NewContext(logger).With("component", "platform")
logger.Log("host", restClientConfig.Host)
cluster, err := kubernetes.NewCluster(restClientConfig, *kubernetesKubectl, logger)
if err != nil {
logger.Log("err", err)
os.Exit(1)
}
if services, err := cluster.AllServices("", nil); err != nil {
logger.Log("services", err)
} else {
logger.Log("services", len(services))
}
k8s = cluster
}
// Instrumentation
var (
daemonMetrics transport.DaemonMetrics
)
{
k8s = platform.Instrument(k8s, platform.NewMetrics())
daemonMetrics.ConnectionDuration = prometheus.NewGaugeFrom(stdprometheus.GaugeOpts{
Namespace: "flux",
Subsystem: "fluxd",
Name: "connection_duration_seconds",
Help: "Duration in seconds of the current connection to fluxsvc. Zero means unconnected.",
}, []string{"target"})
}
// Connect to fluxsvc
daemonLogger := log.NewContext(logger).With("component", "client")
daemon, err := transport.NewDaemon(
http.DefaultClient,
flux.Token(*token),
transport.NewRouter(),
*fluxsvcAddress,
k8s,
daemonLogger,
daemonMetrics,
)
if err != nil {
logger.Log("err", err)
os.Exit(1)
}
defer daemon.Close()
// Mechanical components.
errc := make(chan error)
go func() {
c := make(chan os.Signal)
signal.Notify(c, syscall.SIGINT, syscall.SIGTERM)
errc <- fmt.Errorf("%s", <-c)
}()
// HTTP transport component, for metrics
go func() {
logger.Log("addr", *listenAddr)
mux := http.NewServeMux()
mux.Handle("/metrics", promhttp.Handler())
errc <- http.ListenAndServe(*listenAddr, mux)
}()
// Go!
logger.Log("exiting", <-errc)
}
func main() {
// Flag domain.
fs := pflag.NewFlagSet("default", pflag.ExitOnError)
fs.Usage = func() {
fmt.Fprintf(os.Stderr, "DESCRIPTION\n")
fmt.Fprintf(os.Stderr, " fluxsvc is a deployment service.\n")
fmt.Fprintf(os.Stderr, "\n")
fmt.Fprintf(os.Stderr, "FLAGS\n")
fs.PrintDefaults()
}
var (
listenAddr = fs.StringP("listen", "l", ":3030", "Listen address for Flux API clients")
databaseSource = fs.String("database-source", "file://fluxy.db", `Database source name; includes the DB driver as the scheme. The default is a temporary, file-based DB`)
databaseMigrationsDir = fs.String("database-migrations", "./db/migrations", "Path to database migration scripts, which are in subdirectories named for each driver")
natsURL = fs.String("nats-url", "", `URL on which to connect to NATS, or empty to use the standalone message bus (e.g., "nats://*****:*****@nats:4222")`)
)
fs.Parse(os.Args)
// Logger component.
var logger log.Logger
{
logger = log.NewLogfmtLogger(os.Stderr)
logger = log.NewContext(logger).With("ts", log.DefaultTimestampUTC)
logger = log.NewContext(logger).With("caller", log.DefaultCaller)
}
// Initialise database; we must fail if we can't do this, because
// most things depend on it.
var dbDriver string
{
var version uint64
u, err := url.Parse(*databaseSource)
if err == nil {
version, err = db.Migrate(*databaseSource, *databaseMigrationsDir)
}
if err != nil {
logger.Log("stage", "db init", "err", err)
os.Exit(1)
}
dbDriver = db.DriverForScheme(u.Scheme)
logger.Log("migrations", "success", "driver", dbDriver, "db-version", fmt.Sprintf("%d", version))
}
// Instrumentation
var (
httpDuration metrics.Histogram
serverMetrics server.Metrics
releaseMetrics release.Metrics
helperDuration metrics.Histogram
busMetrics platform.BusMetrics
)
{
httpDuration = prometheus.NewHistogramFrom(stdprometheus.HistogramOpts{
Namespace: "flux",
Subsystem: "fluxsvc",
Name: "http_request_duration_seconds",
Help: "HTTP request duration in seconds.",
Buckets: stdprometheus.DefBuckets,
}, []string{"method", "status_code"})
serverMetrics.ListServicesDuration = prometheus.NewHistogramFrom(stdprometheus.HistogramOpts{
Namespace: "flux",
Subsystem: "fluxsvc",
Name: "list_services_duration_seconds",
Help: "ListServices method duration in seconds.",
Buckets: stdprometheus.DefBuckets,
}, []string{"namespace", "success"})
serverMetrics.ListImagesDuration = prometheus.NewHistogramFrom(stdprometheus.HistogramOpts{
Namespace: "flux",
Subsystem: "fluxsvc",
Name: "list_images_duration_seconds",
Help: "ListImages method duration in seconds.",
Buckets: stdprometheus.DefBuckets,
}, []string{"service_spec", "success"})
serverMetrics.HistoryDuration = prometheus.NewHistogramFrom(stdprometheus.HistogramOpts{
Namespace: "flux",
Subsystem: "fluxsvc",
Name: "history_duration_seconds",
Help: "History method duration in seconds.",
Buckets: stdprometheus.DefBuckets,
}, []string{"service_spec", "success"})
serverMetrics.RegisterDaemonDuration = prometheus.NewHistogramFrom(stdprometheus.HistogramOpts{
Namespace: "flux",
Subsystem: "fluxsvc",
Name: "register_daemon_duration_seconds",
Help: "RegisterDaemon method duration in seconds.",
Buckets: stdprometheus.DefBuckets,
}, []string{"instance_id", "success"})
serverMetrics.ConnectedDaemons = prometheus.NewGaugeFrom(stdprometheus.GaugeOpts{
Namespace: "flux",
Subsystem: "fluxsvc",
Name: "connected_daemons_count",
Help: "Gauge of the current number of connected daemons",
}, []string{})
serverMetrics.PlatformMetrics = platform.NewMetrics()
releaseMetrics.ReleaseDuration = prometheus.NewHistogramFrom(stdprometheus.HistogramOpts{
Namespace: "flux",
Subsystem: "fluxsvc",
Name: "release_duration_seconds",
Help: "Release method duration in seconds.",
Buckets: stdprometheus.DefBuckets,
}, []string{"release_type", "release_kind", "success"})
releaseMetrics.ActionDuration = prometheus.NewHistogramFrom(stdprometheus.HistogramOpts{
Namespace: "flux",
Subsystem: "fluxsvc",
Name: "release_action_duration_seconds",
Help: "Duration in seconds of each sub-action invoked as part of a non-dry-run release.",
Buckets: stdprometheus.DefBuckets,
}, []string{"action", "success"})
releaseMetrics.StageDuration = prometheus.NewHistogramFrom(stdprometheus.HistogramOpts{
Namespace: "flux",
Subsystem: "fluxsvc",
Name: "release_stage_duration_seconds",
Help: "Duration in seconds of each stage of a release, including dry-runs.",
Buckets: stdprometheus.DefBuckets,
}, []string{"method", "stage"})
helperDuration = prometheus.NewHistogramFrom(stdprometheus.HistogramOpts{
Namespace: "flux",
Subsystem: "fluxsvc",
Name: "release_helper_duration_seconds",
Help: "Duration in seconds of a variety of release helper methods.",
Buckets: stdprometheus.DefBuckets,
}, []string{"method", "success"})
busMetrics = platform.NewBusMetrics()
}
var messageBus platform.MessageBus
{
if *natsURL != "" {
bus, err := nats.NewMessageBus(*natsURL, busMetrics)
if err != nil {
logger.Log("component", "message bus", "err", err)
os.Exit(1)
}
logger.Log("component", "message bus", "type", "NATS")
messageBus = bus
} else {
messageBus = platform.NewStandaloneMessageBus(busMetrics)
logger.Log("component", "message bus", "type", "standalone")
}
}
var historyDB history.DB
{
db, err := historysql.NewSQL(dbDriver, *databaseSource)
if err != nil {
logger.Log("component", "history", "err", err)
os.Exit(1)
}
historyDB = db
}
// Configuration, i.e., whether services are automated or not.
var instanceDB instance.DB
{
db, err := instancedb.New(dbDriver, *databaseSource)
if err != nil {
logger.Log("component", "config", "err", err)
os.Exit(1)
}
instanceDB = db
}
var instancer instance.Instancer
{
// Instancer, for the instancing of operations
instancer = &instance.MultitenantInstancer{
DB: instanceDB,
Connecter: messageBus,
Logger: logger,
Histogram: helperDuration,
History: historyDB,
}
}
// Job store.
var jobStore jobs.JobStore
{
s, err := jobs.NewDatabaseStore(dbDriver, *databaseSource, time.Hour)
if err != nil {
logger.Log("component", "release job store", "err", err)
os.Exit(1)
}
jobStore = s
}
// Automator component.
var auto *automator.Automator
{
var err error
auto, err = automator.New(automator.Config{
Jobs: jobStore,
InstanceDB: instanceDB,
Logger: log.NewContext(logger).With("component", "automator"),
})
if err == nil {
logger.Log("automator", "enabled")
} else {
// Service can handle a nil automator pointer.
logger.Log("automator", "disabled", "reason", err)
}
}
go auto.Start(log.NewContext(logger).With("component", "automator"))
// Job workers.
{
logger := log.NewContext(logger).With("component", "worker")
worker := jobs.NewWorker(jobStore, logger)
worker.Register(jobs.AutomatedServiceJob, auto)
worker.Register(jobs.ReleaseJob, release.NewReleaser(instancer, releaseMetrics))
defer func() {
if err := worker.Stop(shutdownTimeout); err != nil {
logger.Log("err", err)
}
}()
go worker.Work()
cleaner := jobs.NewCleaner(jobStore, logger)
cleanTicker := time.NewTicker(15 * time.Second)
defer cleanTicker.Stop()
go cleaner.Clean(cleanTicker.C)
}
// The server.
server := server.New(instancer, messageBus, jobStore, logger, serverMetrics)
// Mechanical components.
errc := make(chan error)
go func() {
c := make(chan os.Signal)
signal.Notify(c, syscall.SIGINT, syscall.SIGTERM)
errc <- fmt.Errorf("%s", <-c)
}()
// HTTP transport component.
go func() {
logger.Log("addr", *listenAddr)
mux := http.NewServeMux()
mux.Handle("/metrics", promhttp.Handler())
mux.Handle("/", transport.NewHandler(server, transport.NewRouter(), logger, httpDuration))
errc <- http.ListenAndServe(*listenAddr, mux)
}()
logger.Log("exiting", <-errc)
}