Golang Logger.Print方法代碼示例

// Expects: the context to hold the authed user
func CommandWebGET(ctx context.Context, ws *websocket.Conn, logger services.Logger, db data.DB) {
	u, ok := user.FromContext(ctx)
	if !ok {
		logger.Print("CommandWebGET Error: failed to retrieve user from context")
		return
	}

	input := make(chan string)
	output := make(chan string)

	session := command.NewSession(
		u, db, input, output,
		func() {
			log.Print("CommandWebGET bail")
			close(output)
		},
	)

	go session.Start()

	go func() {
		for {
			var message string
			err := websocket.Message.Receive(ws, &message)

			if err != nil {
				if err != io.EOF {
					log.Printf("Read fail: %s", err)
				}

				close(output) // should this know about output
				return
			}

			input <- message
		}
	}()

	for o := range output {
		err := websocket.Message.Send(ws, o)

		if err != nil {
			log.Printf("Write fail: %s", err)
			return
		}
	}
}

func ContextualizeCommandWebGET(ctx context.Context, db data.DB, logger services.Logger) websocket.Handler {
	return func(c *websocket.Conn) {

		if err := c.Request().ParseForm(); err != nil {
			logger.Print("Failure parsing form")
			return
		}

		public := c.Request().Form.Get("public")
		private := c.Request().Form.Get("private")

		if public == "" || private == "" {
			logger.Print("failed to retrieve credentials")
			return
		}

		cred, err := access.Authenticate(db, public, private)
		if err != nil {
			logger.Print("failed to auth")
			return
		}

		u, _ := cred.Owner(db)
		CommandWebGET(user.NewContext(ctx, u), c, logger, db)
	}
}

func MobileLocationPOST(ctx context.Context, w http.ResponseWriter, r *http.Request, l services.Logger, db data.DB) {
	// Parse the form value
	if err := r.ParseForm(); err != nil {
		l.Printf("MobileLocationPOST Error: %s", err)
		http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
		return
	}

	// Altitude
	alt := r.FormValue(altitudeParam)
	if alt == "" {
		http.Error(w, "You must specify an altitude", http.StatusBadRequest)
		return
	}
	altitude, err := strconv.ParseFloat(alt, 64)
	if err != nil {
		http.Error(w, "Parsing altitude", http.StatusBadRequest)
		return
	}

	// Latitude
	lat := r.FormValue(latitudeParam)
	if lat == "" {
		http.Error(w, "You must specify a latitude", http.StatusBadRequest)
		return
	}
	latitude, err := strconv.ParseFloat(lat, 64)
	if err != nil {
		http.Error(w, "Parsing latitude", http.StatusBadRequest)
		return
	}

	// Longitude
	lon := r.FormValue(longitudeParam)
	if lon == "" {
		http.Error(w, "You must specify an longitude", http.StatusBadRequest)
		return
	}
	longitude, err := strconv.ParseFloat(lon, 64)
	if err != nil {
		http.Error(w, "Parsing longitude", http.StatusBadRequest)
		return
	}

	// Retrieve the user this request was authenticated as
	u, ok := user.FromContext(ctx)
	if !ok { // This is certainly an issue, and should _never_ happen
		l.Print("MobileLocationPOST Error: failed to retrieve user from context")
		http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
		return
	}

	// Create location
	loc := location.NewCoords(altitude, latitude, longitude)
	loc.SetID(db.NewID())
	loc.SetOwner(u)

	now := loc.CreatedAt

	e := models.NewEvent()
	e.CreatedAt = now
	e.SetID(db.NewID())
	e.SetOwner(u)
	e.Name = "Location Update"
	e.SetLocation(loc)
	e.Time = now
	e.UpdatedAt = now

	locationTag, err1 := tag.ForName(db, u, tag.Location)
	updateTag, err2 := tag.ForName(db, u, tag.Update)
	mobileTag, err3 := tag.ForName(db, u, tag.Mobile)
	if err1 != nil || err2 != nil || err3 != nil {
		l.Printf("MobileLocationPOST Error: %s", err)
		http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
		return
	}
	e.IncludeTag(locationTag)
	e.IncludeTag(updateTag)
	e.IncludeTag(mobileTag)

	if err = db.Save(loc); err != nil {
		l.Printf("MobileLocationPOST Error: %s", err)
		http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
		return
	}

	if err = db.Save(e); err != nil {
		l.Printf("MobileLocationPOST Error: %s", err)
		http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
		return
	}

	bytes, err := json.MarshalIndent(e, "", "	")
	if err != nil {
		l.Printf("MobileLocationPOST Error: while marshalling json %s", err)
		http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
		return
	}

	w.WriteHeader(http.StatusCreated)
//.........這裏部分代碼省略.........