Golang Logger.Error方法代碼示例

func mineBlock(status MiningStatus, srv *context.T, log log15.Logger, previousBlockHash types.Hash, transactions []*transaction.Envelope) {
	if bat := prepareBAT(srv, log); bat != nil {
		blk, err := block.NewBlock(previousBlockHash, targetBits(), append(transactions, bat))
		if err != nil {
			log.Error("error while creating a new block", "err", err)
		} else {
			// send off the new pool
			for i := range status.Miners {
				status.Miners[i].signallingChannel <- blk
				status.Miners[i].Block = blk
				status.Miners[i].StartTime = time.Now()
			}
		}
	}

}

func processPendingAllocations(srv *context.T, log log15.Logger) {
	pending := srv.DB.ListPendingRepositories()
	for i := range pending {
		r, err := srv.DB.GetRepository(pending[i])
		if err != nil {
			log.Error("error while processing pending repository", "repo", pending[i], "err", err)
		}
		c, err := srv.DB.GetTransactionConfirmations(r.NameAllocationTx)
		if err != nil {
			log.Error("error while calculating pending repository's allocation confirmations",
				"repo", pending[i], "txn", r.NameAllocationTx, "err", err)
		}
		if c >= ALLOCATION_CONFIRMATIONS_REQUIRED {
			r.Status = repository.ACTIVE
			srv.DB.PutRepository(r)
			log.Info("activated repository", "repo", pending[i], "alloc_txn", r.NameAllocationTx)
		}

	}
}

func InfoHandler(srv *context.T, log log15.Logger) func(http.ResponseWriter, *http.Request) {
	return func(resp http.ResponseWriter, req *http.Request) {
		log := log.New("http")
		lastBlock, err := srv.DB.GetLastBlock()
		if err != nil {
			log.Error("error serving /info", "err", err)
		}
		info := Info{
			Mining:    server.GetMiningStatus(),
			LastBlock: lastBlock,
		}
		info.Debug.NumGoroutine = runtime.NumGoroutine()
		json, err := json.Marshal(info)
		if err != nil {
			log.Error("error serving /info", "err", err)
		}
		resp.Header().Add("Content-Type", "application/json")
		resp.Write(json)
	}

}

func WebsocketHandler(srv *context.T, log log15.Logger) func(http.ResponseWriter, *http.Request) {
	return func(w http.ResponseWriter, r *http.Request) {
		log := log.New("cmp", "websocket")
		conn, err := upgrader.Upgrade(w, r, nil)
		if err != nil {
			log.Error("error upgrading websocket connetion", "err", err)
			return
		}

		ch := srv.Router.Sub("/block")
		defer srv.Router.Unsub(ch)

	loop:
		select {
		case blki := <-ch:
			if blk, ok := blki.(*block.Block); ok {
				encoded, err := json.Marshal(blk)
				if err != nil {
					log.Error("error encoding block", "err", err)
					return
				}
				if err = conn.WriteMessage(websocket.TextMessage, encoded); err != nil {
					log.Error("error sending data", "err", err)
					return
				}
			}
		}
		goto loop

	}
}

func listenAndServer(log log15.Logger, addr string, handler http.Handler) error {
	conf, err := config.GetConfig()
	if err != nil {
		return err
	}

	conf.Endless.DefaultHammerTime = strings.TrimSpace(conf.Endless.DefaultHammerTime)

	if conf.Endless.DefaultHammerTime != "" {
		duration, err := time.ParseDuration(conf.Endless.DefaultHammerTime)
		if err == nil {
			endless.DefaultHammerTime = duration
		} else {
			log.Error("Bad format", log15.Ctx{"module": "Endless", "DefaultHammerTime": conf.Endless.DefaultHammerTime, "error": err})
		}
	}

	var terminated int32
	srv := endless.NewServer(addr, handler)
	preHookFunc := func() {
		atomic.StoreInt32(&terminated, 1)
	}
	srv.RegisterSignalHook(endless.PRE_SIGNAL, syscall.SIGHUP, preHookFunc)
	srv.RegisterSignalHook(endless.PRE_SIGNAL, syscall.SIGINT, preHookFunc)
	srv.RegisterSignalHook(endless.PRE_SIGNAL, syscall.SIGTERM, preHookFunc)

	log.Info("Launching server")
	err = srv.ListenAndServe()
	if atomic.LoadInt32(&terminated) == 0 {
		if err != nil {
			log.Error("During startup, error has occurred", "error", err)
		}
		return err
	} else {
		log.Info("Server is going to shutdown")
		return nil
	}
}

func prepareBAT(srv *context.T, log log15.Logger) *transaction.Envelope {
	key, err := srv.DB.GetMainKey()
	if err != nil {
		log.Error("error while attempting to retrieve main key", "err", err)
	}
	if key != nil {
		bat, err := transaction.NewBlockAttribution()
		if err != nil {
			log.Error("error while creating a BAT", "err", err)
		} else {
			hash, err := srv.DB.GetPreviousEnvelopeHashForPublicKey(&key.PublicKey)
			if err != nil {
				log.Error("error while creating a BAT", "err", err)
			}
			bate := transaction.NewEnvelope(hash, bat)
			bate.Sign(key)
			return bate
		}
	}
	return nil

}

func SetupGitRoutes(r *mux.Router, srv *context.T, log log15.Logger) {
	log = log.New("cmp", "git")
	// Git Server
	r.Methods("POST").Path("/{repository:.+}/git-upload-pack").HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
		log := log.New("cmp", "git-upload-pack")
		dec := pktline.NewDecoder(req.Body)
		resp.Header().Add("Cache-Control", "no-cache")
		resp.Header().Add("Content-Type", "application/x-git-upload-pack-result")
		enc := pktline.NewEncoder(resp)

		var wants, haves, common []git.Hash
		var objects []git.Object
		wantsRcvd := false

		for {
			var pktline []byte
			if err := dec.Decode(&pktline); err != nil {
				log.Error("error while decoding pkt-line", "err", err)
				return
			}

			switch {
			case pktline == nil:
				switch {
				case !wantsRcvd:
					wantsRcvd = true
				case wantsRcvd:
					for i := range haves {
						_, err := readObject(srv, haves[i])
						if err == nil {
							enc.Encode([]byte(fmt.Sprintf("ACK %x common\n", haves[i])))
							common = append(common, haves[i])
						} else {
							enc.Encode([]byte("NAK\n"))
						}
					}
					haves = make([]git.Hash, 0)
				}
			case bytes.Compare(pktline, []byte("done\n")) == 0:
				if len(common) == 0 {
					enc.Encode([]byte("NAK\n"))
				}
				goto done
			default:
				line := bytes.Split(pktline, []byte{' '})
				h := bytes.TrimSuffix(line[1], []byte{10})
				hash, err := hex.DecodeString(string(h))
				if err != nil {
					enc.Encode(append([]byte{3}, []byte(fmt.Sprintf("error parsing hash %s: %v\n", line[1], err))...))
					return
				}
				if string(line[0]) == "want" {
					wants = append(wants, hash)
				}
				if string(line[0]) == "have" {
					haves = append(haves, hash)
				}
			}
		}
	done:
		var err error
		for i := range wants {
			var objs []git.Object
			objs, err = processCommit(srv, wants[i], common)
			if err != nil {
				enc.Encode(append([]byte{3}, []byte(fmt.Sprintf("%s", err))...))
				return
			}
			objects = append(objects, objs...)
		}
		// filter out duplicates
		seen := make(map[string]bool)
		filteredObjects := make([]git.Object, 0)
		for i := range objects {
			hash := string(objects[i].Hash())
			if !seen[hash] {
				seen[hash] = true
				filteredObjects = append(filteredObjects, objects[i])
			}
		}
		//

		packfile := git.NewPackfile(filteredObjects)
		err = git.WritePackfile(&sideband64Writer{writer: &pktlineWriter{encoder: enc}, band: 1}, packfile)
		if err != nil {
			enc.Encode(append([]byte{3}, []byte(fmt.Sprintf("%s", err))...))
			return
		}

		enc.Encode(append([]byte{1}, pktlineToBytes(nil)...))
		enc.Encode(nil)
	})

	r.Methods("POST").Path("/{repository:.+}/git-receive-pack").HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
		reponame := mux.Vars(req)["repository"]
		var lines [][]byte
		dec := pktline.NewDecoder(req.Body)
		dec.DecodeUntilFlush(&lines)
		resp.Header().Add("Cache-Control", "no-cache")
		resp.Header().Add("Content-Type", "application/x-git-receive-pack-result")
//.........這裏部分代碼省略.........

func listenAndServer(log log15.Logger, addr string, handler http.Handler) error {
	log.Info("Launching server")
	err := http.ListenAndServe(addr, handler)
	log.Error("During startup, error has occurred", "error", err)
	return err
}