feat: introduce http api version

cmd/booster-http/http_test.go

@@ -3,6 +3,7 @@ package main
 import (
 	"compress/gzip"
 	"context"
+	"encoding/json"
 	"io"
 	"net/http"
 	"os"
@@ -156,3 +157,24 @@ func TestHttpResponseRedirects(t *testing.T) {
 	err = httpServer.Stop()
 	require.NoError(t, err)
 }
+
+func TestHttpInfo(t *testing.T) {
+	var v apiVersion
+
+	// Create a new mock Http server
+	ctrl := gomock.NewController(t)
+	httpServer := NewHttpServer("", 7777, false, mocks_booster_http.NewMockHttpServerApi(ctrl))
+	httpServer.Start(context.Background())
+
+	response, err := http.Get("http://localhost:7777/info")
+	require.NoError(t, err)
+	defer response.Body.Close()
+
+	json.NewDecoder(response.Body).Decode(&v) //nolint:errcheck
+	require.Equal(t, "0.2.0", v.Version)
+
+	// Stop the server
+	err = httpServer.Stop()
+	require.NoError(t, err)
+
+}

cmd/booster-http/server.go

@@ -3,6 +3,7 @@ package main
 import (
 	"bufio"
 	"context"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -43,6 +44,10 @@ const carSuffix = ".car"
 const pieceCidParam = "pieceCid"
 const payloadCidParam = "payloadCid"
 
+type apiVersion struct {
+	Version string `json:"Version"`
+}
+
 type HttpServer struct {
 	path          string
 	port          int
@@ -78,6 +83,7 @@ func (s *HttpServer) Start(ctx context.Context) {
 	handler.HandleFunc(s.pieceBasePath(), s.handlePieceRequest)
 	handler.HandleFunc("/", s.handleIndex)
 	handler.HandleFunc("/index.html", s.handleIndex)
+	handler.HandleFunc("/info", s.handleInfo)
 	handler.Handle("/metrics", metrics.Exporter("booster_http")) // metrics
 	s.server = &http.Server{
 		Addr:    listenAddr,
@@ -199,6 +205,15 @@ func (s *HttpServer) handlePieceRequest(w http.ResponseWriter, r *http.Request)
 	}
 }
 
+func (s *HttpServer) handleInfo(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	v := apiVersion{
+		Version: "0.2.0",
+	}
+	json.NewEncoder(w).Encode(v) //nolint:errcheck
+}
+
 func (s *HttpServer) handleByPayloadCid(payloadCid cid.Cid, isCar bool, w http.ResponseWriter, r *http.Request) {
 	startTime := time.Now()
 	ctx, span := tracing.Tracer.Start(r.Context(), "http.payload_cid")