bestBlockHash and blockHash http handlers

server/https.go

@@ -4,9 +4,11 @@ import (
 	"blockbook/db"
 	"context"
 	"encoding/json"
+	"fmt"
 	"log"
 	"net/http"
 	"os"
+	"strconv"
 
 	"github.com/gorilla/handlers"
 	"github.com/gorilla/mux"
@@ -28,7 +30,9 @@ func New(db *db.RocksDB) (*HttpServer, error) {
 
 	r := mux.NewRouter()
 
-	r.HandleFunc("/", s.Info)
+	r.HandleFunc("/", s.info)
+	r.HandleFunc("/bestBlockHash", s.bestBlockHash)
+	r.HandleFunc("/blockHash/{height}", s.blockHash)
 
 	var h http.Handler = r
 	h = handlers.LoggingHandler(os.Stdout, h)
@@ -37,22 +41,39 @@ func New(db *db.RocksDB) (*HttpServer, error) {
 	return s, nil
 }
 
+// Run starts the server
 func (s *HttpServer) Run() error {
 	log.Printf("http server starting on port %s", s.https.Addr)
 	return s.https.ListenAndServe()
 }
 
+// Close closes the server
 func (s *HttpServer) Close() error {
 	log.Printf("http server closing")
 	return s.https.Close()
 }
 
+// Shutdown shuts down the server
 func (s *HttpServer) Shutdown(ctx context.Context) error {
 	log.Printf("http server shutdown")
 	return s.https.Shutdown(ctx)
 }
 
-func (s *HttpServer) Info(w http.ResponseWriter, r *http.Request) {
+func respondError(w http.ResponseWriter, err error, context string) {
+	w.WriteHeader(http.StatusBadRequest)
+	log.Printf("http server %s error: %v", context, err)
+}
+
+func respondHashData(w http.ResponseWriter, hash string) {
+	type hashData struct {
+		Hash string `json:"hash"`
+	}
+	json.NewEncoder(w).Encode(hashData{
+		Hash: hash,
+	})
+}
+
+func (s *HttpServer) info(w http.ResponseWriter, r *http.Request) {
 	type info struct {
 		Version string `json:"version"`
 	}
@@ -60,3 +81,26 @@ func (s *HttpServer) Info(w http.ResponseWriter, r *http.Request) {
 		Version: "0.0.1",
 	})
 }
+
+func (s *HttpServer) bestBlockHash(w http.ResponseWriter, r *http.Request) {
+	hash, err := s.db.GetBestBlockHash()
+	if err != nil {
+		respondError(w, err, "bestBlockHash")
+		return
+	}
+	respondHashData(w, hash)
+}
+
+func (s *HttpServer) blockHash(w http.ResponseWriter, r *http.Request) {
+	heightString := mux.Vars(r)["height"]
+	var hash string
+	height, err := strconv.ParseUint(heightString, 10, 32)
+	if err == nil {
+		hash, err = s.db.GetBlockHash(uint32(height))
+	}
+	if err != nil {
+		respondError(w, err, fmt.Sprintf("blockHash %s", heightString))
+	} else {
+		respondHashData(w, hash)
+	}
+}