Golang Core.Logger Examples

Example #1

File: handler.go Project: quixoten/vault

// handleRequestForwarding determines whether to forward a request or not,
// falling back on the older behavior of redirecting the client
func handleRequestForwarding(core *vault.Core, handler http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Header.Get(vault.IntNoForwardingHeaderName) != "" {
			handler.ServeHTTP(w, r)
			return
		}

		if r.Header.Get(NoRequestForwardingHeaderName) != "" {
			// Forwarding explicitly disabled, fall back to previous behavior
			core.Logger().Trace("http/handleRequestForwarding: forwarding disabled by client request")
			handler.ServeHTTP(w, r)
			return
		}

		// Note: in an HA setup, this call will also ensure that connections to
		// the leader are set up, as that happens once the advertised cluster
		// values are read during this function
		isLeader, leaderAddr, err := core.Leader()
		if err != nil {
			if err == vault.ErrHANotEnabled {
				// Standalone node, serve request normally
				handler.ServeHTTP(w, r)
				return
			}
			// Some internal error occurred
			respondError(w, http.StatusInternalServerError, err)
			return
		}
		if isLeader {
			// No forwarding needed, we're leader
			handler.ServeHTTP(w, r)
			return
		}
		if leaderAddr == "" {
			respondError(w, http.StatusInternalServerError, fmt.Errorf("node not active but active node not found"))
			return
		}

		// Attempt forwarding the request. If we cannot forward -- perhaps it's
		// been disabled on the active node -- this will return with an
		// ErrCannotForward and we simply fall back
		statusCode, header, retBytes, err := core.ForwardRequest(r)
		if err != nil {
			if err == vault.ErrCannotForward {
				core.Logger().Trace("http/handleRequestForwarding: cannot forward (possibly disabled on active node), falling back")
			} else {
				core.Logger().Error("http/handleRequestForwarding: error forwarding request", "error", err)
			}

			// Fall back to redirection
			handler.ServeHTTP(w, r)
			return
		}

		if header != nil {
			for k, v := range header {
				for _, j := range v {
					w.Header().Add(k, j)
				}
			}
		}

		w.WriteHeader(statusCode)
		w.Write(retBytes)
		return
	})
}

Example #2

File: handler.go Project: mhurne/vault

// handleRequestForwarding determines whether to forward a request or not,
// falling back on the older behavior of redirecting the client
func handleRequestForwarding(core *vault.Core, handler http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Header.Get(vault.IntNoForwardingHeaderName) != "" {
			handler.ServeHTTP(w, r)
			return
		}

		if r.Header.Get(NoRequestForwardingHeaderName) != "" {
			// Forwarding explicitly disabled, fall back to previous behavior
			core.Logger().Printf("[TRACE] http/handleRequestForwarding: forwarding disabled by client request")
			handler.ServeHTTP(w, r)
			return
		}

		// Note: in an HA setup, this call will also ensure that connections to
		// the leader are set up, as that happens once the advertised cluster
		// values are read during this function
		isLeader, leaderAddr, err := core.Leader()
		if err != nil {
			if err == vault.ErrHANotEnabled {
				// Standalone node, serve request normally
				handler.ServeHTTP(w, r)
				return
			}
			// Some internal error occurred
			respondError(w, http.StatusInternalServerError, err)
			return
		}
		if isLeader {
			// No forwarding needed, we're leader
			handler.ServeHTTP(w, r)
			return
		}
		if leaderAddr == "" {
			respondError(w, http.StatusInternalServerError, fmt.Errorf("node not active but active node not found"))
			return
		}

		// Attempt forwarding the request. If we cannot forward -- perhaps it's
		// been disabled on the active node -- this will return with an
		// ErrCannotForward and we simply fall back
		resp, err := core.ForwardRequest(r)
		if err != nil {
			if err == vault.ErrCannotForward {
				core.Logger().Printf("[TRACE] http/handleRequestForwarding: cannot forward (possibly disabled on active node), falling back")
			} else {
				core.Logger().Printf("[ERR] http/handleRequestForwarding: error forwarding request: %v", err)
			}

			// Fall back to redirection
			handler.ServeHTTP(w, r)
			return
		}
		defer resp.Body.Close()

		// Read the body into a buffer so we can write it back out to the
		// original requestor
		buf := bytes.NewBuffer(nil)
		_, err = buf.ReadFrom(resp.Body)
		if err != nil {
			core.Logger().Printf("[ERR] http/handleRequestForwarding: error reading response body: %v", err)
			respondError(w, http.StatusInternalServerError, err)
			return
		}

		w.WriteHeader(resp.StatusCode)
		w.Write(buf.Bytes())
		return
	})
}