super-graph/internal/serv/serv.go

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package serv
import (
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"context"
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"fmt"
"net/http"
"os"
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"os/signal"
"path"
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"strings"
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"time"
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rice "github.com/GeertJohan/go.rice"
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"github.com/NYTimes/gziphandler"
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"github.com/dosco/super-graph/internal/serv/internal/auth"
"go.opencensus.io/plugin/ochttp"
)
var (
apiRoute string = "/api/v1/graphql"
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)
func initWatcher() {
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cpath := conf.cpath
if conf != nil && !conf.WatchAndReload {
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return
}
var d dir
if len(cpath) == 0 || cpath == "./" {
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d = Dir("./config", ReExec)
} else {
d = Dir(cpath, ReExec)
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}
go func() {
err := Do(log.Printf, d)
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if err != nil {
log.Fatalf("ERR %s", err)
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}
}()
}
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func startHTTP() {
var appName string
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defaultHP := "0.0.0.0:8080"
env := os.Getenv("GO_ENV")
if conf != nil {
appName = conf.AppName
hp := strings.SplitN(conf.HostPort, ":", 2)
if len(hp) == 2 {
if len(conf.Host) != 0 {
hp[0] = conf.Host
}
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if len(conf.Port) != 0 {
hp[1] = conf.Port
}
conf.hostPort = fmt.Sprintf("%s:%s", hp[0], hp[1])
}
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}
if len(conf.hostPort) == 0 {
conf.hostPort = defaultHP
}
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routes, err := routeHandler()
if err != nil {
log.Fatalf("ERR %s", err)
}
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srv := &http.Server{
Addr: conf.hostPort,
Handler: routes,
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ReadTimeout: 5 * time.Second,
WriteTimeout: 10 * time.Second,
MaxHeaderBytes: 1 << 20,
}
if conf.telemetryEnabled() {
srv.Handler = &ochttp.Handler{Handler: routes}
}
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idleConnsClosed := make(chan struct{})
go func() {
sigint := make(chan os.Signal, 1)
signal.Notify(sigint, os.Interrupt)
<-sigint
if err := srv.Shutdown(context.Background()); err != nil {
log.Fatalln("INF shutdown signal received")
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}
close(idleConnsClosed)
}()
srv.RegisterOnShutdown(func() {
if conf.closeFn != nil {
conf.closeFn()
}
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db.Close()
log.Fatalln("INF shutdown complete")
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})
log.Printf("INF Super Graph started, version: %s, git-branch: %s, host-port: %s, app-name: %s, env: %s\n",
version, gitBranch, conf.hostPort, appName, env)
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if err := srv.ListenAndServe(); err != http.ErrServerClosed {
log.Fatalln("INF server closed")
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}
<-idleConnsClosed
}
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func routeHandler() (http.Handler, error) {
var err error
mux := http.NewServeMux()
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if conf == nil {
return mux, nil
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}
if len(conf.APIPath) != 0 {
apiRoute = path.Join("/", conf.APIPath, "/v1/graphql")
}
routes := map[string]http.Handler{
"/health": http.HandlerFunc(health),
apiRoute: apiV1Handler(),
}
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if err := setActionRoutes(routes); err != nil {
return nil, err
}
if conf.WebUI {
routes["/"] = http.FileServer(rice.MustFindBox("./web/build").HTTPBox())
}
if conf.HTTPGZip {
gz := gziphandler.MustNewGzipLevelHandler(6)
for k, v := range routes {
routes[k] = gz(v)
}
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}
for k, v := range routes {
mux.Handle(k, v)
}
if conf.telemetryEnabled() {
conf.closeFn, err = enableObservability(mux)
if err != nil {
return nil, err
}
}
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fn := func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Server", serverName)
mux.ServeHTTP(w, r)
}
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return http.HandlerFunc(fn), nil
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}
func setActionRoutes(routes map[string]http.Handler) error {
var err error
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for _, a := range conf.Actions {
var fn http.Handler
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fn, err = newAction(&a)
if err != nil {
break
}
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p := fmt.Sprintf("/api/v1/actions/%s", strings.ToLower(a.Name))
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if ac := findAuth(a.AuthName); ac != nil {
routes[p], err = auth.WithAuth(fn, ac)
} else {
routes[p] = fn
}
if conf.telemetryEnabled() {
routes[p] = ochttp.WithRouteTag(routes[p], p)
}
if err != nil {
return err
}
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}
return nil
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}
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func findAuth(name string) *auth.Auth {
for _, a := range conf.Auths {
if strings.EqualFold(a.Name, name) {
return &a
}
}
return nil
}