Create fetch http server

config/config.go

@@ -9,23 +9,27 @@ import (
 const cdbpath = "DBPath"
 const port = "port"
 const mport = "mport"
+const fport = "fport"
 
 type Config struct {
 	DBPath      string
 	Port        string
 	MonitorPort string
+	FetchPort   string
 }
 
 func New() *Config {
 	lookups := make(map[string]*string)
 	add(cdbpath, "./db", lookups)
-	add(port, "9101", lookups)
-	add(mport, "9102", lookups)
+	add(port, ":9101", lookups)
+	add(mport, ":9102", lookups)
+	add(fport, ":9103", lookups)
 	flag.Parse()
 	return &Config{
 		DBPath:      *lookups[cdbpath],
 		Port:        *lookups[port],
 		MonitorPort: *lookups[mport],
+		FetchPort:   *lookups[fport],
 	}
 }
 

fetch/fetch.go

@@ -1,19 +1,26 @@
 package fetch
 
 import (
+	"context"
+	"fmt"
 	"io/ioutil"
+	"local1/logger"
 	"net/http"
+	"time"
 )
 
 type Fetch struct {
 	process func(string, []byte) error
 	client  *http.Client
+	server  *http.Server
+	port    string
 }
 
-func New(process func(string, []byte) error) (*Fetch, error) {
+func New(port string, process func(string, []byte) error) (*Fetch, error) {
 	return &Fetch{
 		process: process,
 		client:  &http.Client{},
+		port:    port,
 	}, nil
 }
 
@@ -36,3 +43,65 @@ func (fetcher *Fetch) FetchProcess(url string) error {
 	}
 	return nil
 }
+
+func (fetcher *Fetch) listen() error {
+	fetcher.server = &http.Server{
+		Addr: fetcher.port,
+		Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			if r.URL.Path != "/fetchfeed" {
+				http.NotFound(w, r)
+				logger.Logf("bad path: %q", r.URL.Path)
+				return
+			}
+			if r.Method != "POST" && r.Method != "PUT" {
+				http.NotFound(w, r)
+				logger.Logf("bad method: %q", r.Method)
+				return
+			}
+			b, err := ioutil.ReadAll(r.Body)
+			defer r.Body.Close()
+			if err != nil || len(b) == 0 {
+				logger.Log(len(b), err)
+				w.WriteHeader(http.StatusBadRequest)
+				return
+			}
+			if err := fetcher.FetchProcess(string(b)); err != nil {
+				w.WriteHeader(http.StatusInternalServerError)
+				return
+			}
+		}),
+	}
+	if err := fetcher.server.ListenAndServe(); err != http.ErrServerClosed && err != nil {
+		return err
+	}
+	return nil
+}
+
+func (fetcher *Fetch) Start() error {
+	errs := make(chan error)
+	go func() {
+		if err := fetcher.listen(); err != nil {
+			select {
+			case errs <- err:
+			case <-time.After(time.Second * 10):
+				panic(err)
+			}
+		}
+	}()
+	select {
+	case err := <-errs:
+		return fmt.Errorf("%s: %v", "fetcher server quit early", err)
+	case <-time.After(time.Second * 10):
+	}
+	return nil
+}
+
+func (fetcher *Fetch) Close() error {
+	return fetcher.Stop()
+}
+
+func (fetcher *Fetch) Stop() error {
+	ctx, can := context.WithTimeout(context.Background(), time.Second*10)
+	defer can()
+	return fetcher.server.Shutdown(ctx)
+}

fetch/fetch_test.go

@@ -7,6 +7,8 @@ import (
 	"testing"
 )
 
+const testfport = ":13153"
+
 func Test_Fetch(t *testing.T) {
 	s := mockRemote()
 	defer s.Close()
@@ -28,7 +30,7 @@ func Test_Fetch(t *testing.T) {
 		},
 	}
 	for _, c := range cases {
-		f, err := New(c.process)
+		f, err := New(testfport, c.process)
 		if err != nil && err != c.err {
 			t.Errorf("cannot create new fetcher: %v", err)
 		} else if err == nil {