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never operate more than once on FS until cache expires #1

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Merged
WebReflection merged 1 commit into from
Apr 24, 2020
Merged

never operate more than once on FS until cache expires #1

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188 changes: 97 additions & 91 deletions cjs/index.js
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Original file line number Diff line number Diff line change
@@ -1,13 +1,15 @@
'use strict';
const {
createReadStream, stat, mkdir, readFile, unlink, existsSync, writeFileSync, watchFile, unwatchFile
createReadStream, mkdir, unlink, existsSync, writeFileSync, watch
} = require('fs');
const {tmpdir} = require('os');
const {dirname, extname, join, resolve} = require('path');

const ucompress = (m => m.__esModule ? /* istanbul ignore next */ m.default : /* istanbul ignore next */ m)(require('ucompress'));

const {parse} = JSON;
const json = (m => m.__esModule ? /* istanbul ignore next */ m.default : /* istanbul ignore next */ m)(require('./json.js'));
const stat = (m => m.__esModule ? /* istanbul ignore next */ m.default : /* istanbul ignore next */ m)(require('./stat.js'));

const {compressed} = ucompress;

const getPath = source => (source[0] === '/' ? source : resolve(source));
Expand All @@ -18,15 +20,12 @@ const internalServerError = res => {
res.end();
};

const readAndServe = (res, asset, IfNoneMatch) => {
readFile(asset + '.json', (err, data) => {
const readAndServe = (res, asset, cacheTimeout, IfNoneMatch) =>
json(asset, cacheTimeout).then(
headers => serveFile(res, asset, headers, IfNoneMatch),
/* istanbul ignore next */
if (err)
internalServerError(res);
else
serveFile(res, asset, parse(data), IfNoneMatch);
});
};
() => internalServerError(res)
);

const serveFile = (res, asset, headers, IfNoneMatch) => {
if (headers.ETag === IfNoneMatch) {
Expand All @@ -42,99 +41,106 @@ const streamFile = (res, asset, headers) => {
createReadStream(asset).pipe(res);
};

module.exports = ({source, dest, headers}) => {
module.exports = ({source, dest, headers, cacheTimeout: CT}) => {
const SOURCE = getPath(source);
const DEST = dest ? getPath(dest) : join(tmpdir(), 'ucdn');
const options = {createFiles: true, headers};
return (req, res, next) => {
const path = req.url.replace(/\?.*$/, '');
const original = SOURCE + path;
stat(original, (err, stats) => {
if (err || !stats.isFile()) {
stat(original, CT).then(
({lastModified, size}) => {
if (path === '/favicon.ico')
streamFile(res, original, {
'Content-Length': size,
'Content-Type': 'image/vnd.microsoft.icon',
...headers
});
else {
let asset = DEST + path;
let compression = '';
const {
['accept-encoding']: AcceptEncoding,
['if-none-match']: IfNoneMatch,
['if-modified-since']: IfModifiedSince
} = req.headers;
if (compressed.has(extname(path).toLowerCase())) {
switch (true) {
/* istanbul ignore next */
case /\bbr\b/.test(AcceptEncoding):
compression = '.br';
break;
case /\bgzip\b/.test(AcceptEncoding):
compression = '.gzip';
break;
/* istanbul ignore next */
case /\bdeflate\b/.test(AcceptEncoding):
compression = '.deflate';
break;
}
asset += compression;
}
const create = () => {
const {length} = compression;
const compress = length ? asset.slice(0, -length) : asset;
const waitForIt = compress + '.wait';
mkdir(dirname(waitForIt), {recursive: true}, err => {
/* istanbul ignore if */
if (err)
internalServerError(res);
else if (existsSync(waitForIt))
watch(waitForIt, andClose).on(
'close',
() => readAndServe(res, asset, CT, IfNoneMatch)
);
else {
try {
writeFileSync(waitForIt, path);
ucompress(original, compress, options)
.then(
() => {
unlink(waitForIt, err => {
/* istanbul ignore if */
if (err)
internalServerError(res);
else
readAndServe(res, asset, CT, IfNoneMatch);
});
},
/* istanbul ignore next */
() => unlink(waitForIt, () => internalServerError(res))
);
}
catch (o_O) {
/* istanbul ignore next */
internalServerError(res);
}
}
});
};
json(asset, CT).then(
headers => {
if (lastModified === IfModifiedSince)
serveFile(res, asset, headers, IfNoneMatch);
else
create();
},
create
);
}
},
() => {
if (next)
next();
else {
res.writeHead(404);
res.end();
}
}
else if (path === '/favicon.ico')
streamFile(res, original, {
'Content-Length': stats.size,
'Content-Type': 'image/vnd.microsoft.icon',
...headers
});
else {
let asset = DEST + path;
let compression = '';
const {
['accept-encoding']: AcceptEncoding,
['if-none-match']: IfNoneMatch,
['if-modified-since']: IfModifiedSince
} = req.headers;
if (compressed.has(extname(path).toLowerCase())) {
switch (true) {
/* istanbul ignore next */
case /\bbr\b/.test(AcceptEncoding):
compression = '.br';
break;
case /\bgzip\b/.test(AcceptEncoding):
compression = '.gzip';
break;
/* istanbul ignore next */
case /\bdeflate\b/.test(AcceptEncoding):
compression = '.deflate';
break;
}
asset += compression;
}
readFile(asset + '.json', (err, data) => {
// if there was no error, be sure the source file is still the same
if (!err) {
if (new Date(stats.mtimeMs).toUTCString() === IfModifiedSince) {
serveFile(res, asset, parse(data), IfNoneMatch);
return;
}
}
// if the file was modified, re-optimize it, assuming it changed too
const {length} = compression;
const compress = length ? asset.slice(0, -length) : asset;
const waitForIt = compress + '.wait';
mkdir(dirname(waitForIt), {recursive: true}, err => {
/* istanbul ignore next */
if (err)
internalServerError(res);
else if (existsSync(waitForIt))
watchFile(waitForIt, () => {
unwatchFile(waitForIt);
readAndServe(res, asset, IfNoneMatch);
});
else {
try {
writeFileSync(waitForIt, path);
ucompress(original, compress, options)
.then(
() => {
unlink(waitForIt, err => {
/* istanbul ignore next */
if (err)
internalServerError(res);
else
readAndServe(res, asset, IfNoneMatch);
});
},
/* istanbul ignore next */
() => unlink(waitForIt, () => internalServerError(res))
);
}
catch (o_O) {
/* istanbul ignore next */
internalServerError(res);
}
}
});
});
}
});
);
};
};

function andClose() {
this.close();
}
29 changes: 29 additions & 0 deletions cjs/json.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,29 @@
'use strict';
const {readFile} = require('fs');

const umap = (m => m.__esModule ? /* istanbul ignore next */ m.default : /* istanbul ignore next */ m)(require('umap'));

const {parse} = JSON;

const _ = new Map;
const $ = umap(_);

const clear = asset => {
_.delete(asset);
};

module.exports = (asset, timeout = 1000) => (
$.get(asset) ||
$.set(asset, new Promise((res, rej) => {
readFile(asset + '.json', (err, data) => {
if (err) {
_.delete(asset);
rej();
}
else {
res(parse(data));
setTimeout(clear, timeout, asset);
}
});
}))
);
30 changes: 30 additions & 0 deletions cjs/stat.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,30 @@
'use strict';
const {stat} = require('fs');

const umap = (m => m.__esModule ? /* istanbul ignore next */ m.default : /* istanbul ignore next */ m)(require('umap'));

const _ = new Map;
const $ = umap(_);

const clear = asset => {
_.delete(asset);
};

module.exports = (asset, timeout = 1000) => (
$.get(asset) ||
$.set(asset, new Promise((res, rej) => {
stat(asset, (err, stats) => {
if (err || !stats.isFile()) {
_.delete(asset);
rej();
}
else {
setTimeout(clear, timeout, asset);
res({
lastModified: new Date(stats.mtimeMs).toUTCString(),
size: stats.size
});
}
});
}))
);
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