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main.go
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main.go
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package main
import (
"context"
"fmt"
"net/http"
"os"
"path/filepath"
"time"
"github.com/go-chi/chi"
"github.com/go-chi/chi/middleware"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/oklog/run"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/signalcd/signalcd/database/boltdb"
"github.com/signalcd/signalcd/signalcd"
"github.com/urfave/cli"
"golang.org/x/xerrors"
)
const (
flagAddr = "addr"
flagAddrAgent = "addr.agent"
flagAddrInternal = "addr.internal"
flagBoltPath = "bolt.path"
flagTLSCert = "tls.cert"
flagTLSKey = "tls.key"
flagUIAssets = "ui.assets"
)
func main() {
logger := log.NewLogfmtLogger(log.NewSyncWriter(os.Stderr))
logger = log.WithPrefix(logger, "ts", log.DefaultTimestampUTC)
logger = log.WithPrefix(logger, "caller", log.DefaultCaller)
app := cli.NewApp()
app.Action = apiAction(logger)
app.Flags = []cli.Flag{
cli.StringFlag{
Name: flagBoltPath,
Value: "./development/data",
},
cli.StringFlag{
Name: flagAddr,
Usage: "The address for the public HTTP/gRPC API server",
Value: ":6660",
},
cli.StringFlag{
Name: flagAddrAgent,
Usage: "The address for the agent gRPC server",
Value: ":6661",
},
cli.StringFlag{
Name: flagAddrInternal,
Usage: "The address for the internal HTTP server",
Value: ":6662",
},
cli.StringFlag{
Name: flagTLSCert,
Usage: "The path to the TLS certificate",
},
cli.StringFlag{
Name: flagTLSKey,
Usage: "The path to the TLS key",
},
cli.StringFlag{
Name: flagUIAssets,
Usage: "The path to the UI assets on disk",
Value: "./ui",
},
}
if err := app.Run(os.Args); err != nil {
logger.Log("msg", "failed running api", "err", err)
os.Exit(1)
}
}
func apiAction(logger log.Logger) cli.ActionFunc {
return func(c *cli.Context) error {
registry := prometheus.NewRegistry()
registry.MustRegister(
prometheus.NewGoCollector(),
prometheus.NewProcessCollector(prometheus.ProcessCollectorOpts{}),
)
events := signalcd.NewEvents()
var db Database
{
bolt, dbClose, err := boltdb.New(c.String(flagBoltPath))
if err != nil {
return xerrors.Errorf("failed to create bolt db: %w", err)
}
defer dbClose()
boltEvents := boltdb.NewEvents(bolt, events)
db = boltEvents
}
var gr run.Group
{
apiV1, err := NewV1(logger, registry, db, events)
if err != nil {
return fmt.Errorf("failed to initialize api: %w", err)
}
r := chi.NewRouter()
r.Use(Logger(logger))
r.Use(HTTPMetrics(registry))
{
// Serving the HTTP/gRPC API
r.Mount("/", apiV1)
}
{
directory := c.String(flagUIAssets)
if _, err := os.Stat(directory); os.IsNotExist(err) {
return fmt.Errorf("assets directory does not exist: %s", directory)
}
// Serving the UI assets
r.Get("/", file(directory, "index.html"))
r.Get("/bulma.min.css", file(directory, "bulma.min.css"))
r.Get("/bundle.js", file(directory, "bundle.js"))
r.Get("/bundle.js.map", file(directory, "bundle.js.map"))
r.NotFound(file(directory, "index.html"))
}
s := http.Server{
Addr: c.String(flagAddr),
Handler: r,
}
gr.Add(func() error {
level.Info(logger).Log(
"msg", "running public HTTP/gRPC API server",
"addr", s.Addr,
)
tlsCert, tlsKey := c.String(flagTLSCert), c.String(flagTLSKey)
if tlsCert != "" && tlsKey != "" {
return s.ListenAndServeTLS(tlsCert, tlsKey)
} else {
return s.ListenAndServe()
}
}, func(err error) {
_ = s.Shutdown(context.TODO())
})
}
{
r := chi.NewRouter()
r.Mount("/metrics", promhttp.HandlerFor(registry, promhttp.HandlerOpts{}))
r.Mount("/debug", middleware.Profiler())
s := http.Server{
Addr: c.String(flagAddrInternal),
Handler: r,
}
gr.Add(func() error {
level.Info(logger).Log(
"msg", "running internal HTTP API",
"addr", s.Addr,
)
return s.ListenAndServe()
}, func(err error) {
_ = s.Shutdown(context.TODO())
})
}
if err := gr.Run(); err != nil {
return xerrors.Errorf("error running: %w", err)
}
return nil
}
}
func file(directory, name string) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
http.ServeFile(w, r, filepath.Join(directory, name))
}
}
// Logger returns a middleware to log HTTP requests
func Logger(logger log.Logger) func(next http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
start := time.Now()
ww := middleware.NewWrapResponseWriter(w, r.ProtoMajor)
next.ServeHTTP(ww, r)
level.Debug(logger).Log(
"proto", r.Proto,
"method", r.Method,
"status", ww.Status(),
"content", r.Header.Get("Content-Type"),
"path", r.URL.Path,
"duration", time.Since(start),
"bytes", ww.BytesWritten(),
)
})
}
}
// HTTPMetrics returns a middleware to track HTTP requests with Prometheus metrics
func HTTPMetrics(registry *prometheus.Registry) func(next http.Handler) http.Handler {
duration := prometheus.NewHistogramVec(prometheus.HistogramOpts{
Name: "http_request_duration_seconds",
Help: "Tracks the latencies for HTTP requests.",
}, nil)
counter := prometheus.NewCounterVec(prometheus.CounterOpts{
Name: "http_requests_total",
Help: "Tracks the number of HTTP requests.",
}, []string{"code", "method"})
registry.MustRegister(duration, counter)
return func(next http.Handler) http.Handler {
return promhttp.InstrumentHandlerDuration(duration,
promhttp.InstrumentHandlerCounter(counter, next),
)
}
}