aws-cdk
Version:
CDK Toolkit, the command line tool for CDK apps
151 lines • 20.8 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.BackgroundStackRefresh = exports.ActiveAssetCache = void 0;
exports.refreshStacks = refreshStacks;
const logging_1 = require("../../logging");
const error_1 = require("../../toolkit/error");
class ActiveAssetCache {
constructor() {
this.stacks = new Set();
}
rememberStack(stackTemplate) {
this.stacks.add(stackTemplate);
}
contains(asset) {
for (const stack of this.stacks) {
if (stack.includes(asset)) {
return true;
}
}
return false;
}
}
exports.ActiveAssetCache = ActiveAssetCache;
async function paginateSdkCall(cb) {
let finished = false;
let nextToken;
while (!finished) {
nextToken = await cb(nextToken);
if (nextToken === undefined) {
finished = true;
}
}
}
/**
* Fetches all relevant stack templates from CloudFormation. It ignores the following stacks:
* - stacks in DELETE_COMPLETE or DELETE_IN_PROGRESS stage
* - stacks that are using a different bootstrap qualifier
*/
async function fetchAllStackTemplates(cfn, qualifier) {
const stackNames = [];
await paginateSdkCall(async (nextToken) => {
const stacks = await cfn.listStacks({ NextToken: nextToken });
// We ignore stacks with these statuses because their assets are no longer live
const ignoredStatues = ['CREATE_FAILED', 'DELETE_COMPLETE', 'DELETE_IN_PROGRESS', 'DELETE_FAILED', 'REVIEW_IN_PROGRESS'];
stackNames.push(...(stacks.StackSummaries ?? [])
.filter((s) => !ignoredStatues.includes(s.StackStatus))
.map((s) => s.StackId ?? s.StackName));
return stacks.NextToken;
});
(0, logging_1.debug)(`Parsing through ${stackNames.length} stacks`);
const templates = [];
for (const stack of stackNames) {
let summary;
summary = await cfn.getTemplateSummary({
StackName: stack,
});
if (bootstrapFilter(summary.Parameters, qualifier)) {
// This stack is definitely bootstrapped to a different qualifier so we can safely ignore it
continue;
}
else {
const template = await cfn.getTemplate({
StackName: stack,
});
templates.push((template.TemplateBody ?? '') + JSON.stringify(summary?.Parameters));
}
}
(0, logging_1.debug)('Done parsing through stacks');
return templates;
}
/**
* Filter out stacks that we KNOW are using a different bootstrap qualifier
* This is mostly necessary for the integration tests that can run the same app (with the same assets)
* under different qualifiers.
* This is necessary because a stack under a different bootstrap could coincidentally reference the same hash
* and cause a false negative (cause an asset to be preserved when its isolated)
* This is intentionally done in a way where we ONLY filter out stacks that are meant for a different qualifier
* because we are okay with false positives.
*/
function bootstrapFilter(parameters, qualifier) {
const bootstrapVersion = parameters?.find((p) => p.ParameterKey === 'BootstrapVersion');
const splitBootstrapVersion = bootstrapVersion?.DefaultValue?.split('/');
// We find the qualifier in a specific part of the bootstrap version parameter
return (qualifier &&
splitBootstrapVersion &&
splitBootstrapVersion.length == 4 &&
splitBootstrapVersion[2] != qualifier);
}
async function refreshStacks(cfn, activeAssets, qualifier) {
try {
const stacks = await fetchAllStackTemplates(cfn, qualifier);
for (const stack of stacks) {
activeAssets.rememberStack(stack);
}
}
catch (err) {
throw new error_1.ToolkitError(`Error refreshing stacks: ${err}`);
}
}
/**
* Class that controls scheduling of the background stack refresh
*/
class BackgroundStackRefresh {
constructor(props) {
this.props = props;
this.queuedPromises = [];
this.lastRefreshTime = Date.now();
}
start() {
// Since start is going to be called right after the first invocation of refreshStacks,
// lets wait some time before beginning the background refresh.
this.timeout = setTimeout(() => this.refresh(), 300000); // 5 minutes
}
async refresh() {
const startTime = Date.now();
await refreshStacks(this.props.cfn, this.props.activeAssets, this.props.qualifier);
this.justRefreshedStacks();
// If the last invocation of refreshStacks takes <5 minutes, the next invocation starts 5 minutes after the last one started.
// If the last invocation of refreshStacks takes >5 minutes, the next invocation starts immediately.
this.timeout = setTimeout(() => this.refresh(), Math.max(startTime + 300000 - Date.now(), 0));
}
justRefreshedStacks() {
this.lastRefreshTime = Date.now();
for (const p of this.queuedPromises.splice(0, this.queuedPromises.length)) {
p(undefined);
}
}
/**
* Checks if the last successful background refresh happened within the specified time frame.
* If the last refresh is older than the specified time frame, it returns a Promise that resolves
* when the next background refresh completes or rejects if the refresh takes too long.
*/
noOlderThan(ms) {
const horizon = Date.now() - ms;
// The last refresh happened within the time frame
if (this.lastRefreshTime >= horizon) {
return Promise.resolve();
}
// The last refresh happened earlier than the time frame
// We will wait for the latest refresh to land or reject if it takes too long
return Promise.race([
new Promise(resolve => this.queuedPromises.push(resolve)),
new Promise((_, reject) => setTimeout(() => reject(new error_1.ToolkitError('refreshStacks took too long; the background thread likely threw an error')), ms)),
]);
}
stop() {
clearTimeout(this.timeout);
}
}
exports.BackgroundStackRefresh = BackgroundStackRefresh;
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{ ParameterDeclaration } from '@aws-sdk/client-cloudformation';\nimport { debug } from '../../logging';\nimport { ToolkitError } from '../../toolkit/error';\nimport { ICloudFormationClient } from '../aws-auth';\n\nexport class ActiveAssetCache {\n  private readonly stacks: Set<string> = new Set();\n\n  public rememberStack(stackTemplate: string) {\n    this.stacks.add(stackTemplate);\n  }\n\n  public contains(asset: string): boolean {\n    for (const stack of this.stacks) {\n      if (stack.includes(asset)) {\n        return true;\n      }\n    }\n    return false;\n  }\n}\n\nasync function paginateSdkCall(cb: (nextToken?: string) => Promise<string | undefined>) {\n  let finished = false;\n  let nextToken: string | undefined;\n  while (!finished) {\n    nextToken = await cb(nextToken);\n    if (nextToken === undefined) {\n      finished = true;\n    }\n  }\n}\n\n/**\n * Fetches all relevant stack templates from CloudFormation. It ignores the following stacks:\n * - stacks in DELETE_COMPLETE or DELETE_IN_PROGRESS stage\n * - stacks that are using a different bootstrap qualifier\n */\nasync function fetchAllStackTemplates(cfn: ICloudFormationClient, qualifier?: string) {\n  const stackNames: string[] = [];\n  await paginateSdkCall(async (nextToken) => {\n    const stacks = await cfn.listStacks({ NextToken: nextToken });\n\n    // We ignore stacks with these statuses because their assets are no longer live\n    const ignoredStatues = ['CREATE_FAILED', 'DELETE_COMPLETE', 'DELETE_IN_PROGRESS', 'DELETE_FAILED', 'REVIEW_IN_PROGRESS'];\n    stackNames.push(\n      ...(stacks.StackSummaries ?? [])\n        .filter((s: any) => !ignoredStatues.includes(s.StackStatus))\n        .map((s: any) => s.StackId ?? s.StackName),\n    );\n\n    return stacks.NextToken;\n  });\n\n  debug(`Parsing through ${stackNames.length} stacks`);\n\n  const templates: string[] = [];\n  for (const stack of stackNames) {\n    let summary;\n    summary = await cfn.getTemplateSummary({\n      StackName: stack,\n    });\n\n    if (bootstrapFilter(summary.Parameters, qualifier)) {\n      // This stack is definitely bootstrapped to a different qualifier so we can safely ignore it\n      continue;\n    } else {\n      const template = await cfn.getTemplate({\n        StackName: stack,\n      });\n\n      templates.push((template.TemplateBody ?? '') + JSON.stringify(summary?.Parameters));\n    }\n  }\n\n  debug('Done parsing through stacks');\n\n  return templates;\n}\n\n/**\n * Filter out stacks that we KNOW are using a different bootstrap qualifier\n * This is mostly necessary for the integration tests that can run the same app (with the same assets)\n * under different qualifiers.\n * This is necessary because a stack under a different bootstrap could coincidentally reference the same hash\n * and cause a false negative (cause an asset to be preserved when its isolated)\n * This is intentionally done in a way where we ONLY filter out stacks that are meant for a different qualifier\n * because we are okay with false positives.\n */\nfunction bootstrapFilter(parameters?: ParameterDeclaration[], qualifier?: string) {\n  const bootstrapVersion = parameters?.find((p) => p.ParameterKey === 'BootstrapVersion');\n  const splitBootstrapVersion = bootstrapVersion?.DefaultValue?.split('/');\n  // We find the qualifier in a specific part of the bootstrap version parameter\n  return (qualifier &&\n          splitBootstrapVersion &&\n          splitBootstrapVersion.length == 4 &&\n          splitBootstrapVersion[2] != qualifier);\n}\n\nexport async function refreshStacks(cfn: ICloudFormationClient, activeAssets: ActiveAssetCache, qualifier?: string) {\n  try {\n    const stacks = await fetchAllStackTemplates(cfn, qualifier);\n    for (const stack of stacks) {\n      activeAssets.rememberStack(stack);\n    }\n  } catch (err) {\n    throw new ToolkitError(`Error refreshing stacks: ${err}`);\n  }\n}\n\n/**\n * Background Stack Refresh properties\n */\nexport interface BackgroundStackRefreshProps {\n  /**\n   * The CFN SDK handler\n   */\n  readonly cfn: ICloudFormationClient;\n\n  /**\n   * Active Asset storage\n   */\n  readonly activeAssets: ActiveAssetCache;\n\n  /**\n   * Stack bootstrap qualifier\n   */\n  readonly qualifier?: string;\n}\n\n/**\n * Class that controls scheduling of the background stack refresh\n */\nexport class BackgroundStackRefresh {\n  private timeout?: NodeJS.Timeout;\n  private lastRefreshTime: number;\n  private queuedPromises: Array<(value: unknown) => void> = [];\n\n  constructor(private readonly props: BackgroundStackRefreshProps) {\n    this.lastRefreshTime = Date.now();\n  }\n\n  public start() {\n    // Since start is going to be called right after the first invocation of refreshStacks,\n    // lets wait some time before beginning the background refresh.\n    this.timeout = setTimeout(() => this.refresh(), 300_000); // 5 minutes\n  }\n\n  private async refresh() {\n    const startTime = Date.now();\n\n    await refreshStacks(this.props.cfn, this.props.activeAssets, this.props.qualifier);\n    this.justRefreshedStacks();\n\n    // If the last invocation of refreshStacks takes <5 minutes, the next invocation starts 5 minutes after the last one started.\n    // If the last invocation of refreshStacks takes >5 minutes, the next invocation starts immediately.\n    this.timeout = setTimeout(() => this.refresh(), Math.max(startTime + 300_000 - Date.now(), 0));\n  }\n\n  private justRefreshedStacks() {\n    this.lastRefreshTime = Date.now();\n    for (const p of this.queuedPromises.splice(0, this.queuedPromises.length)) {\n      p(undefined);\n    }\n  }\n\n  /**\n   * Checks if the last successful background refresh happened within the specified time frame.\n   * If the last refresh is older than the specified time frame, it returns a Promise that resolves\n   * when the next background refresh completes or rejects if the refresh takes too long.\n   */\n  public noOlderThan(ms: number) {\n    const horizon = Date.now() - ms;\n\n    // The last refresh happened within the time frame\n    if (this.lastRefreshTime >= horizon) {\n      return Promise.resolve();\n    }\n\n    // The last refresh happened earlier than the time frame\n    // We will wait for the latest refresh to land or reject if it takes too long\n    return Promise.race([\n      new Promise(resolve => this.queuedPromises.push(resolve)),\n      new Promise((_, reject) => setTimeout(() => reject(new ToolkitError('refreshStacks took too long; the background thread likely threw an error')), ms)),\n    ]);\n  }\n\n  public stop() {\n    clearTimeout(this.timeout);\n  }\n}\n"]}