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Implement fallback hashing algorithm when crypto module is not available (#19941)

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* Implement fallback hashing algorithm when crypto module is not available

* Fix lint errors

* Expose method internally and use in watch.ts

* Simplify syntax; Remove fallback from watch.ts
This commit is contained in:
Adnan Chowdhury 2018-01-25 16:17:58 -08:00 committed by Mohamed Hegazy
parent b80081d0cb
commit 9677b0641c
1 changed files with 24 additions and 6 deletions
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30
src/compiler/sys.ts
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@ -126,10 +126,32 @@ namespace ts {
const _fs = require("fs");
const _path = require("path");
const _os = require("os");
const _crypto = require("crypto");
// crypto can be absent on reduced node installations
let _crypto: any;
try {
_crypto = require("crypto");
}
catch {
_crypto = undefined;
}
const useNonPollingWatchers = process.env.TSC_NONPOLLING_WATCHER;
/**
* djb2 hashing algorithm
* http://www.cse.yorku.ca/~oz/hash.html
*/
function generateDjb2Hash(data: string): string {
const chars = data.split("").map(str => str.charCodeAt(0));
return `${chars.reduce((prev, curr) => ((prev << 5) + prev) + curr, 5381)}`;
}
function createMD5HashUsingNativeCrypto(data: string) {
const hash = _crypto.createHash("md5");
hash.update(data);
return hash.digest("hex");
}
function createWatchedFileSet() {
const dirWatchers = createMap<DirectoryWatcher>();
// One file can have multiple watchers
@ -493,11 +515,7 @@ namespace ts {
return undefined;
}
},
createHash(data) {
const hash = _crypto.createHash("md5");
hash.update(data);
return hash.digest("hex");
},
createHash: _crypto ? createMD5HashUsingNativeCrypto : generateDjb2Hash,
getMemoryUsage() {
if (global.gc) {
global.gc();