@google/cloud-trace/src/constants.js

Node.js Support for StackDriver Trace

/**
 * Copyright 2015 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

'use strict';

module.exports = {
  /** @const {string} header that carries trace context across Google infrastructure. */
  TRACE_CONTEXT_HEADER_NAME: 'x-cloud-trace-context',

  /** @const {string} header that is used to identify outgoing http made by the agent. */
  TRACE_AGENT_REQUEST_HEADER: 'x-cloud-trace-agent-request',

  /** @const {number} bitmask to determine whether trace is enabled in trace options. */
  TRACE_OPTIONS_TRACE_ENABLED: 1 << 0,

  /** See: cloud.google.com/trace/api/reference/rest/v1/projects.traces for limits. */
  /** Maximum size of a span name in bytes. */
  TRACE_SERVICE_SPAN_NAME_LIMIT: 127,

  /** Maximum size of a label key in bytes. */
  TRACE_SERVICE_LABEL_KEY_LIMIT: 127,

  /** Maximum size of a label value in bytes. */
  TRACE_SERVICE_LABEL_VALUE_LIMIT: 16 * 1024 - 1,
};