143 lines
5.1 KiB
JavaScript
143 lines
5.1 KiB
JavaScript
/**
|
|
* @fileoverview Utility for caching lint results.
|
|
* @author Kevin Partington
|
|
*/
|
|
"use strict";
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Requirements
|
|
//-----------------------------------------------------------------------------
|
|
|
|
const assert = require("assert");
|
|
const fs = require("fs");
|
|
const fileEntryCache = require("file-entry-cache");
|
|
const stringify = require("json-stable-stringify-without-jsonify");
|
|
const pkg = require("../../package.json");
|
|
const hash = require("./hash");
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Helpers
|
|
//-----------------------------------------------------------------------------
|
|
|
|
const configHashCache = new WeakMap();
|
|
const nodeVersion = process && process.version;
|
|
|
|
/**
|
|
* Calculates the hash of the config
|
|
* @param {ConfigArray} config The config.
|
|
* @returns {string} The hash of the config
|
|
*/
|
|
function hashOfConfigFor(config) {
|
|
if (!configHashCache.has(config)) {
|
|
configHashCache.set(config, hash(`${pkg.version}_${nodeVersion}_${stringify(config)}`));
|
|
}
|
|
|
|
return configHashCache.get(config);
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Public Interface
|
|
//-----------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Lint result cache. This wraps around the file-entry-cache module,
|
|
* transparently removing properties that are difficult or expensive to
|
|
* serialize and adding them back in on retrieval.
|
|
*/
|
|
class LintResultCache {
|
|
|
|
/**
|
|
* Creates a new LintResultCache instance.
|
|
* @param {string} cacheFileLocation The cache file location.
|
|
* configuration lookup by file path).
|
|
*/
|
|
constructor(cacheFileLocation) {
|
|
assert(cacheFileLocation, "Cache file location is required");
|
|
|
|
this.fileEntryCache = fileEntryCache.create(cacheFileLocation);
|
|
}
|
|
|
|
/**
|
|
* Retrieve cached lint results for a given file path, if present in the
|
|
* cache. If the file is present and has not been changed, rebuild any
|
|
* missing result information.
|
|
* @param {string} filePath The file for which to retrieve lint results.
|
|
* @param {ConfigArray} config The config of the file.
|
|
* @returns {Object|null} The rebuilt lint results, or null if the file is
|
|
* changed or not in the filesystem.
|
|
*/
|
|
getCachedLintResults(filePath, config) {
|
|
|
|
/*
|
|
* Cached lint results are valid if and only if:
|
|
* 1. The file is present in the filesystem
|
|
* 2. The file has not changed since the time it was previously linted
|
|
* 3. The ESLint configuration has not changed since the time the file
|
|
* was previously linted
|
|
* If any of these are not true, we will not reuse the lint results.
|
|
*/
|
|
|
|
const fileDescriptor = this.fileEntryCache.getFileDescriptor(filePath);
|
|
const hashOfConfig = hashOfConfigFor(config);
|
|
const changed = fileDescriptor.changed || fileDescriptor.meta.hashOfConfig !== hashOfConfig;
|
|
|
|
if (fileDescriptor.notFound || changed) {
|
|
return null;
|
|
}
|
|
|
|
// If source is present but null, need to reread the file from the filesystem.
|
|
if (fileDescriptor.meta.results && fileDescriptor.meta.results.source === null) {
|
|
fileDescriptor.meta.results.source = fs.readFileSync(filePath, "utf-8");
|
|
}
|
|
|
|
return fileDescriptor.meta.results;
|
|
}
|
|
|
|
/**
|
|
* Set the cached lint results for a given file path, after removing any
|
|
* information that will be both unnecessary and difficult to serialize.
|
|
* Avoids caching results with an "output" property (meaning fixes were
|
|
* applied), to prevent potentially incorrect results if fixes are not
|
|
* written to disk.
|
|
* @param {string} filePath The file for which to set lint results.
|
|
* @param {ConfigArray} config The config of the file.
|
|
* @param {Object} result The lint result to be set for the file.
|
|
* @returns {void}
|
|
*/
|
|
setCachedLintResults(filePath, config, result) {
|
|
if (result && Object.prototype.hasOwnProperty.call(result, "output")) {
|
|
return;
|
|
}
|
|
|
|
const fileDescriptor = this.fileEntryCache.getFileDescriptor(filePath);
|
|
|
|
if (fileDescriptor && !fileDescriptor.notFound) {
|
|
|
|
// Serialize the result, except that we want to remove the file source if present.
|
|
const resultToSerialize = Object.assign({}, result);
|
|
|
|
/*
|
|
* Set result.source to null.
|
|
* In `getCachedLintResults`, if source is explicitly null, we will
|
|
* read the file from the filesystem to set the value again.
|
|
*/
|
|
if (Object.prototype.hasOwnProperty.call(resultToSerialize, "source")) {
|
|
resultToSerialize.source = null;
|
|
}
|
|
|
|
fileDescriptor.meta.results = resultToSerialize;
|
|
fileDescriptor.meta.hashOfConfig = hashOfConfigFor(config);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Persists the in-memory cache to disk.
|
|
* @returns {void}
|
|
*/
|
|
reconcile() {
|
|
this.fileEntryCache.reconcile();
|
|
}
|
|
}
|
|
|
|
module.exports = LintResultCache;
|