/
http.go
114 lines (99 loc) · 3.33 KB
/
http.go
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package main
import (
"context"
"log"
"net/http"
"net/url"
"os"
"sync"
"time"
calc "github.com/DataDog/trace-examples/go/goa-basic/gen/calc"
calcsvr "github.com/DataDog/trace-examples/go/goa-basic/gen/http/calc/server"
goahttp "goa.design/goa/v3/http"
httpmdlwr "goa.design/goa/v3/http/middleware"
"goa.design/goa/v3/middleware"
httptrace "gopkg.in/DataDog/dd-trace-go.v1/contrib/net/http"
)
// handleHTTPServer starts configures and starts a HTTP server on the given
// URL. It shuts down the server if any error is received in the error channel.
func handleHTTPServer(ctx context.Context, u *url.URL, calcEndpoints *calc.Endpoints, wg *sync.WaitGroup, errc chan error, logger *log.Logger, debug bool) {
// Setup goa log adapter.
var (
adapter middleware.Logger
)
{
adapter = middleware.NewLogger(logger)
}
// Provide the transport specific request decoder and response encoder.
// The goa http package has built-in support for JSON, XML and gob.
// Other encodings can be used by providing the corresponding functions,
// see goa.design/implement/encoding.
var (
dec = goahttp.RequestDecoder
enc = goahttp.ResponseEncoder
)
// Build the service HTTP request multiplexer and configure it to serve
// HTTP requests to the service endpoints.
var mux goahttp.Muxer
{
mux = goahttp.NewMuxer()
}
// Wrap the endpoints with the transport specific layers. The generated
// server packages contains code generated from the design which maps
// the service input and output data structures to HTTP requests and
// responses.
var (
calcServer *calcsvr.Server
)
{
eh := errorHandler(logger)
calcServer = calcsvr.New(calcEndpoints, mux, dec, enc, eh, nil)
if debug {
servers := goahttp.Servers{
calcServer,
}
servers.Use(httpmdlwr.Debug(mux, os.Stdout))
}
}
// Configure the mux.
calcsvr.Mount(mux, calcServer)
// Wrap the multiplexer with additional middlewares. Middlewares mounted
// here apply to all the service endpoints.
var handler http.Handler = mux
{
handler = httpmdlwr.Log(adapter)(handler)
handler = httpmdlwr.RequestID()(handler)
handler = httptrace.WrapHandler(handler, "basic-http", "basic-http")
}
// Start HTTP server using default configuration, change the code to
// configure the server as required by your service.
srv := &http.Server{Addr: u.Host, Handler: handler}
for _, m := range calcServer.Mounts {
logger.Printf("HTTP %q mounted on %s %s", m.Method, m.Verb, m.Pattern)
}
(*wg).Add(1)
go func() {
defer (*wg).Done()
// Start HTTP server in a separate goroutine.
go func() {
logger.Printf("HTTP server listening on %q", u.Host)
errc <- srv.ListenAndServe()
}()
<-ctx.Done()
logger.Printf("shutting down HTTP server at %q", u.Host)
// Shutdown gracefully with a 30s timeout.
ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
defer cancel()
srv.Shutdown(ctx)
}()
}
// errorHandler returns a function that writes and logs the given error.
// The function also writes and logs the error unique ID so that it's possible
// to correlate.
func errorHandler(logger *log.Logger) func(context.Context, http.ResponseWriter, error) {
return func(ctx context.Context, w http.ResponseWriter, err error) {
id := ctx.Value(middleware.RequestIDKey).(string)
w.Write([]byte("[" + id + "] encoding: " + err.Error()))
logger.Printf("[%s] ERROR: %s", id, err.Error())
}
}