@aws-cdk/core
Version:
AWS Cloud Development Kit Core Library
98 lines • 14 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
const cxapi = require("@aws-cdk/cx-api");
const stack_1 = require("./stack");
const token_1 = require("./token");
/**
* Base class for the model side of context providers
*
* Instances of this class communicate with context provider plugins in the 'cdk
* toolkit' via context variables (input), outputting specialized queries for
* more context variables (output).
*
* ContextProvider needs access to a Construct to hook into the context mechanism.
*
* @experimental
*/
class ContextProvider {
/**
* @returns the context key or undefined if a key cannot be rendered (due to tokens used in any of the props)
*/
static getKey(scope, options) {
const stack = stack_1.Stack.of(scope);
const props = Object.assign({ account: stack.account, region: stack.region }, options.props || {});
if (Object.values(props).find(x => token_1.Token.isUnresolved(x))) {
throw new Error(`Cannot determine scope for context provider ${options.provider}.\n` +
`This usually happens when one or more of the provider props have unresolved tokens`);
}
const propStrings = propsToArray(props);
return {
key: `${options.provider}:${propStrings.join(':')}`,
props
};
}
static getValue(scope, options) {
const stack = stack_1.Stack.of(scope);
if (token_1.Token.isUnresolved(stack.account) || token_1.Token.isUnresolved(stack.region)) {
throw new Error(`Cannot retrieve value from context provider ${options.provider} since account/region ` +
`are not specified at the stack level. Either configure "env" with explicit account and region when ` +
`you define your stack, or use the environment variables "CDK_DEFAULT_ACCOUNT" and "CDK_DEFAULT_REGION" ` +
`to inherit environment information from the CLI (not recommended for production stacks)`);
}
const { key, props } = this.getKey(scope, options);
const value = scope.node.tryGetContext(key);
const providerError = extractProviderError(value);
// if context is missing or an error occurred during context retrieval,
// report and return a dummy value.
if (value === undefined || providerError !== undefined) {
stack.reportMissingContext({ key, props, provider: options.provider, });
if (providerError !== undefined) {
scope.node.addError(providerError);
}
return { value: options.dummyValue };
}
return { value };
}
constructor() { }
}
exports.ContextProvider = ContextProvider;
/**
* If the context value represents an error, return the error message
*/
function extractProviderError(value) {
if (typeof value === 'object' && value !== null) {
return value[cxapi.PROVIDER_ERROR_KEY];
}
return undefined;
}
/**
* Quote colons in all strings so that we can undo the quoting at a later point
*
* We'll use $ as a quoting character, for no particularly good reason other
* than that \ is going to lead to quoting hell when the keys are stored in JSON.
*/
function colonQuote(xs) {
return xs.replace('$', '$$').replace(':', '$:');
}
function propsToArray(props, keyPrefix = '') {
const ret = [];
for (const key of Object.keys(props)) {
switch (typeof props[key]) {
case 'object': {
ret.push(...propsToArray(props[key], `${keyPrefix}${key}.`));
break;
}
case 'string': {
ret.push(`${keyPrefix}${key}=${colonQuote(props[key])}`);
break;
}
default: {
ret.push(`${keyPrefix}${key}=${JSON.stringify(props[key])}`);
break;
}
}
}
ret.sort();
return ret;
}
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This should be a dummy value that should preferably\n   * fail during deployment since it represents an invalid state.\n   */\n  readonly dummyValue: any;\n}\n\n/**\n * @experimental\n */\nexport interface GetContextKeyResult {\n  readonly key: string;\n  readonly props: { [key: string]: any };\n}\n\n/**\n * @experimental\n */\nexport interface GetContextValueResult {\n  readonly value?: any;\n}\n\n/**\n * Base class for the model side of context providers\n *\n * Instances of this class communicate with context provider plugins in the 'cdk\n * toolkit' via context variables (input), outputting specialized queries for\n * more context variables (output).\n *\n * ContextProvider needs access to a Construct to hook into the context mechanism.\n *\n * @experimental\n */\nexport class ContextProvider {\n  /**\n   * @returns the context key or undefined if a key cannot be rendered (due to tokens used in any of the props)\n   */\n  public static getKey(scope: Construct, options: GetContextKeyOptions): GetContextKeyResult {\n    const stack = Stack.of(scope);\n\n    const props = {\n      account: stack.account,\n      region: stack.region,\n      ...options.props || {},\n    };\n\n    if (Object.values(props).find(x => Token.isUnresolved(x))) {\n      throw new Error(\n        `Cannot determine scope for context provider ${options.provider}.\\n` +\n        `This usually happens when one or more of the provider props have unresolved tokens`);\n    }\n\n    const propStrings = propsToArray(props);\n    return {\n      key: `${options.provider}:${propStrings.join(':')}`,\n      props\n    };\n  }\n\n  public static getValue(scope: Construct, options: GetContextValueOptions): GetContextValueResult {\n    const stack = Stack.of(scope);\n\n    if (Token.isUnresolved(stack.account) || Token.isUnresolved(stack.region)) {\n      throw new Error(`Cannot retrieve value from context provider ${options.provider} since account/region ` +\n                      `are not specified at the stack level. Either configure \"env\" with explicit account and region when ` +\n                      `you define your stack, or use the environment variables \"CDK_DEFAULT_ACCOUNT\" and \"CDK_DEFAULT_REGION\" ` +\n                      `to inherit environment information from the CLI (not recommended for production stacks)`);\n    }\n\n    const { key, props } = this.getKey(scope, options);\n    const value = scope.node.tryGetContext(key);\n    const providerError = extractProviderError(value);\n\n    // if context is missing or an error occurred during context retrieval,\n    // report and return a dummy value.\n    if (value === undefined || providerError !== undefined) {\n      stack.reportMissingContext({ key, props, provider: options.provider, });\n\n      if (providerError !== undefined) {\n        scope.node.addError(providerError);\n      }\n      return { value: options.dummyValue };\n    }\n\n    return { value };\n  }\n\n  private constructor() { }\n}\n\n/**\n * If the context value represents an error, return the error message\n */\nfunction extractProviderError(value: any): string | undefined {\n  if (typeof value === 'object' && value !== null) {\n    return value[cxapi.PROVIDER_ERROR_KEY];\n  }\n  return undefined;\n}\n\n/**\n * Quote colons in all strings so that we can undo the quoting at a later point\n *\n * We'll use $ as a quoting character, for no particularly good reason other\n * than that \\ is going to lead to quoting hell when the keys are stored in JSON.\n */\nfunction colonQuote(xs: string): string {\n  return xs.replace('$', '$$').replace(':', '$:');\n}\n\nfunction propsToArray(props: {[key: string]: any}, keyPrefix = ''): string[] {\n  const ret: string[] = [];\n\n  for (const key of Object.keys(props)) {\n    switch (typeof props[key]) {\n      case 'object': {\n        ret.push(...propsToArray(props[key], `${keyPrefix}${key}.`));\n        break;\n      }\n      case 'string': {\n        ret.push(`${keyPrefix}${key}=${colonQuote(props[key])}`);\n        break;\n      }\n      default: {\n        ret.push(`${keyPrefix}${key}=${JSON.stringify(props[key])}`);\n        break;\n      }\n    }\n  }\n\n  ret.sort();\n  return ret;\n}\n"]}