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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const Cache = require("../Cache");
const ProgressPlugin = require("../ProgressPlugin");
/** @typedef {import("../Compiler")} Compiler */
const BUILD_DEPENDENCIES_KEY = Symbol();
class IdleFileCachePlugin {
/**
* @param {TODO} strategy cache strategy
* @param {number} idleTimeout timeout
* @param {number} idleTimeoutForInitialStore initial timeout
*/
constructor(strategy, idleTimeout, idleTimeoutForInitialStore) {
this.strategy = strategy;
this.idleTimeout = idleTimeout;
this.idleTimeoutForInitialStore = idleTimeoutForInitialStore;
}
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
let strategy = this.strategy;
const idleTimeout = this.idleTimeout;
const idleTimeoutForInitialStore = Math.min(
idleTimeout,
this.idleTimeoutForInitialStore
);
const resolvedPromise = Promise.resolve();
/** @type {Map<string | typeof BUILD_DEPENDENCIES_KEY, () => Promise>} */
const pendingIdleTasks = new Map();
compiler.cache.hooks.store.tap(
{ name: "IdleFileCachePlugin", stage: Cache.STAGE_DISK },
(identifier, etag, data) => {
pendingIdleTasks.set(identifier, () =>
strategy.store(identifier, etag, data)
);
}
);
compiler.cache.hooks.get.tapPromise(
{ name: "IdleFileCachePlugin", stage: Cache.STAGE_DISK },
(identifier, etag, gotHandlers) => {
const restore = () =>
strategy.restore(identifier, etag).then(cacheEntry => {
if (cacheEntry === undefined) {
gotHandlers.push((result, callback) => {
if (result !== undefined) {
pendingIdleTasks.set(identifier, () =>
strategy.store(identifier, etag, result)
);
}
callback();
});
} else {
return cacheEntry;
}
});
const pendingTask = pendingIdleTasks.get(identifier);
if (pendingTask !== undefined) {
pendingIdleTasks.delete(identifier);
return pendingTask().then(restore);
}
return restore();
}
);
compiler.cache.hooks.storeBuildDependencies.tap(
{ name: "IdleFileCachePlugin", stage: Cache.STAGE_DISK },
dependencies => {
pendingIdleTasks.set(BUILD_DEPENDENCIES_KEY, () =>
strategy.storeBuildDependencies(dependencies)
);
}
);
compiler.cache.hooks.shutdown.tapPromise(
{ name: "IdleFileCachePlugin", stage: Cache.STAGE_DISK },
() => {
if (idleTimer) {
clearTimeout(idleTimer);
idleTimer = undefined;
}
isIdle = false;
const reportProgress = ProgressPlugin.getReporter(compiler);
const jobs = Array.from(pendingIdleTasks.values());
if (reportProgress) reportProgress(0, "process pending cache items");
const promises = jobs.map(fn => fn());
pendingIdleTasks.clear();
promises.push(currentIdlePromise);
const promise = Promise.all(promises);
currentIdlePromise = promise.then(() => strategy.afterAllStored());
if (reportProgress) {
currentIdlePromise = currentIdlePromise.then(() => {
reportProgress(1, `stored`);
});
}
return currentIdlePromise.then(() => {
// Reset strategy
if (strategy.clear) strategy.clear();
});
}
);
/** @type {Promise<any>} */
let currentIdlePromise = resolvedPromise;
let isIdle = false;
let isInitialStore = true;
const processIdleTasks = () => {
if (isIdle) {
if (pendingIdleTasks.size > 0) {
const promises = [currentIdlePromise];
const maxTime = Date.now() + 100;
let maxCount = 100;
for (const [filename, factory] of pendingIdleTasks) {
pendingIdleTasks.delete(filename);
promises.push(factory());
if (maxCount-- <= 0 || Date.now() > maxTime) break;
}
currentIdlePromise = Promise.all(promises);
currentIdlePromise.then(() => {
// Allow to exit the process between
setTimeout(processIdleTasks, 0).unref();
});
return;
}
currentIdlePromise = currentIdlePromise
.then(() => strategy.afterAllStored())
.catch(err => {
const logger = compiler.getInfrastructureLogger(
"IdleFileCachePlugin"
);
logger.warn(`Background tasks during idle failed: ${err.message}`);
logger.debug(err.stack);
});
isInitialStore = false;
}
};
let idleTimer = undefined;
compiler.cache.hooks.beginIdle.tap(
{ name: "IdleFileCachePlugin", stage: Cache.STAGE_DISK },
() => {
idleTimer = setTimeout(
() => {
idleTimer = undefined;
isIdle = true;
resolvedPromise.then(processIdleTasks);
},
isInitialStore ? idleTimeoutForInitialStore : idleTimeout
);
idleTimer.unref();
}
);
compiler.cache.hooks.endIdle.tap(
{ name: "IdleFileCachePlugin", stage: Cache.STAGE_DISK },
() => {
if (idleTimer) {
clearTimeout(idleTimer);
idleTimer = undefined;
}
isIdle = false;
}
);
}
}
module.exports = IdleFileCachePlugin;