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* Copyright The OpenTelemetry Authors\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *      https://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Attributes, AttributeValue, diag } from '@opentelemetry/api';\nimport { SDK_INFO } from '@opentelemetry/core';\nimport {\n  ATTR_SERVICE_NAME,\n  ATTR_TELEMETRY_SDK_LANGUAGE,\n  ATTR_TELEMETRY_SDK_NAME,\n  ATTR_TELEMETRY_SDK_VERSION,\n} from '@opentelemetry/semantic-conventions';\nimport { Resource } from './Resource';\nimport { defaultServiceName } from './default-service-name';\nimport {\n  DetectedResource,\n  DetectedResourceAttributes,\n  MaybePromise,\n  RawResourceAttribute,\n  ResourceOptions,\n} from './types';\nimport { isPromiseLike } from './utils';\n\nclass ResourceImpl implements Resource {\n  private _rawAttributes: RawResourceAttribute[];\n  private _asyncAttributesPending = false;\n  private _schemaUrl?: string;\n\n  private _memoizedAttributes?: Attributes;\n\n  static FromAttributeList(\n    attributes: [string, MaybePromise<AttributeValue | undefined>][],\n    options?: ResourceOptions\n  ): Resource {\n    const res = new ResourceImpl({}, options);\n    res._rawAttributes = guardedRawAttributes(attributes);\n    res._asyncAttributesPending =\n      attributes.filter(([_, val]) => isPromiseLike(val)).length > 0;\n    return res;\n  }\n\n  constructor(\n    /**\n     * A dictionary of attributes with string keys and values that provide\n     * information about the entity as numbers, strings or booleans\n     * TODO: Consider to add check/validation on attributes.\n     */\n    resource: DetectedResource,\n    options?: ResourceOptions\n  ) {\n    const attributes = resource.attributes ?? {};\n    this._rawAttributes = Object.entries(attributes).map(([k, v]) => {\n      if (isPromiseLike(v)) {\n        // side-effect\n        this._asyncAttributesPending = true;\n      }\n\n      return [k, v];\n    });\n\n    this._rawAttributes = guardedRawAttributes(this._rawAttributes);\n    this._schemaUrl = validateSchemaUrl(options?.schemaUrl);\n  }\n\n  public get asyncAttributesPending(): boolean {\n    return this._asyncAttributesPending;\n  }\n\n  public async waitForAsyncAttributes(): Promise<void> {\n    if (!this.asyncAttributesPending) {\n      return;\n    }\n\n    for (let i = 0; i < this._rawAttributes.length; i++) {\n      const [k, v] = this._rawAttributes[i];\n      this._rawAttributes[i] = [k, isPromiseLike(v) ? await v : v];\n    }\n\n    this._asyncAttributesPending = false;\n  }\n\n  public get attributes(): Attributes {\n    if (this.asyncAttributesPending) {\n      diag.error(\n        'Accessing resource attributes before async attributes settled'\n      );\n    }\n\n    if (this._memoizedAttributes) {\n      return this._memoizedAttributes;\n    }\n\n    const attrs: Attributes = {};\n    for (const [k, v] of this._rawAttributes) {\n      if (isPromiseLike(v)) {\n        diag.debug(`Unsettled resource attribute ${k} skipped`);\n        continue;\n      }\n      if (v != null) {\n        attrs[k] ??= v;\n      }\n    }\n\n    // only memoize output if all attributes are settled\n    if (!this._asyncAttributesPending) {\n      this._memoizedAttributes = attrs;\n    }\n\n    return attrs;\n  }\n\n  public getRawAttributes(): RawResourceAttribute[] {\n    return this._rawAttributes;\n  }\n\n  public get schemaUrl(): string | undefined {\n    return this._schemaUrl;\n  }\n\n  public merge(resource: Resource | null): Resource {\n    if (resource == null) return this;\n\n    // Order is important\n    // Spec states incoming attributes override existing attributes\n    const mergedSchemaUrl = mergeSchemaUrl(this, resource);\n    const mergedOptions: ResourceOptions | undefined = mergedSchemaUrl\n      ? { schemaUrl: mergedSchemaUrl }\n      : undefined;\n\n    return ResourceImpl.FromAttributeList(\n      [...resource.getRawAttributes(), ...this.getRawAttributes()],\n      mergedOptions\n    );\n  }\n}\n\nexport function resourceFromAttributes(\n  attributes: DetectedResourceAttributes,\n  options?: ResourceOptions\n): Resource {\n  return ResourceImpl.FromAttributeList(Object.entries(attributes), options);\n}\n\nexport function resourceFromDetectedResource(\n  detectedResource: DetectedResource,\n  options?: ResourceOptions\n): Resource {\n  return new ResourceImpl(detectedResource, options);\n}\n\nexport function emptyResource(): Resource {\n  return resourceFromAttributes({});\n}\n\nexport function defaultResource(): Resource {\n  return resourceFromAttributes({\n    [ATTR_SERVICE_NAME]: defaultServiceName(),\n    [ATTR_TELEMETRY_SDK_LANGUAGE]: SDK_INFO[ATTR_TELEMETRY_SDK_LANGUAGE],\n    [ATTR_TELEMETRY_SDK_NAME]: SDK_INFO[ATTR_TELEMETRY_SDK_NAME],\n    [ATTR_TELEMETRY_SDK_VERSION]: SDK_INFO[ATTR_TELEMETRY_SDK_VERSION],\n  });\n}\n\nfunction guardedRawAttributes(\n  attributes: RawResourceAttribute[]\n): RawResourceAttribute[] {\n  return attributes.map(([k, v]) => {\n    if (isPromiseLike(v)) {\n      return [\n        k,\n        v.catch(err => {\n          diag.debug(\n            'promise rejection for resource attribute: %s - %s',\n            k,\n            err\n          );\n          return undefined;\n        }),\n      ];\n    }\n    return [k, v];\n  });\n}\n\nfunction validateSchemaUrl(schemaUrl?: string): string | undefined {\n  if (typeof schemaUrl === 'string' || schemaUrl === undefined) {\n    return schemaUrl;\n  }\n\n  diag.warn(\n    'Schema URL must be string or undefined, got %s. Schema URL will be ignored.',\n    schemaUrl\n  );\n\n  return undefined;\n}\n\nfunction mergeSchemaUrl(\n  old: Resource,\n  updating: Resource | null\n): string | undefined {\n  const oldSchemaUrl = old?.schemaUrl;\n  const updatingSchemaUrl = updating?.schemaUrl;\n\n  const isOldEmpty = oldSchemaUrl === undefined || oldSchemaUrl === '';\n  const isUpdatingEmpty =\n    updatingSchemaUrl === undefined || updatingSchemaUrl === '';\n\n  if (isOldEmpty) {\n    return updatingSchemaUrl;\n  }\n\n  if (isUpdatingEmpty) {\n    return oldSchemaUrl;\n  }\n\n  if (oldSchemaUrl === updatingSchemaUrl) {\n    return oldSchemaUrl;\n  }\n\n  diag.warn(\n    'Schema URL merge conflict: old resource has \"%s\", updating resource has \"%s\". Resulting resource will have undefined Schema URL.',\n    oldSchemaUrl,\n    updatingSchemaUrl\n  );\n\n  return undefined;\n}\n"]}