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file - use readableStream

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メモリ利用量が改善します
This commit is contained in:
otofune 2017-11-10 10:54:08 +09:00
parent 7972c3b030
commit 06f4c8cea5
1 changed files with 65 additions and 52 deletions
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117
src/file/server.ts
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@ -8,6 +8,7 @@ import * as bodyParser from 'body-parser';
import * as cors from 'cors';
import * as mongodb from 'mongodb';
import * as gm from 'gm';
import * as stream from 'stream';
import DriveFile, { getGridFSBucket } from '../api/models/drive-file';
@ -33,60 +34,81 @@ app.get('/', (req, res) => {
});
app.get('/default-avatar.jpg', (req, res) => {
// TODO: 非同期にしたい。Promise対応してないんだろうか...
const file = fs.readFileSync(`${__dirname}/assets/avatar.jpg`);
const file = fs.createReadStream(`${__dirname}/assets/avatar.jpg`);
send(file, 'image/jpeg', req, res);
});
app.get('/app-default.jpg', (req, res) => {
// TODO: 非同期にしたい。Promise対応してないんだろうか...
const file = fs.readFileSync(`${__dirname}/assets/dummy.png`);
const file = fs.createReadStream(`${__dirname}/assets/dummy.png`);
send(file, 'image/png', req, res);
});
async function raw(data: Buffer, type: string, download: boolean, res: express.Response): Promise<any> {
res.header('Content-Type', type);
interface ISend {
contentType: string;
stream: stream.Readable;
}
if (download) {
function thumbnail(data: stream.Readable, type: string, resize: number): ISend {
const readable: stream.Readable = (() => {
if (!/^image\/.*$/.test(type)) {
// 使わないことにしたストリームはしっかり取り壊しておく
data.destroy();
return fs.createReadStream(`${__dirname}/assets/not-an-image.png`);
}
return data;
})();
let g = gm(readable);
if (resize) {
g = g.resize(resize, resize);
}
const stream = g
.compress('jpeg')
.quality(80)
.stream();
return {
contentType: 'image/jpeg',
stream
};
}
const commonReadableHandlerGenerator = (req: express.Request, res: express.Response) => (e: Error): void => {
console.dir(e);
req.destroy();
res.destroy(e);
};
function send(readable: stream.Readable, type: string, req: express.Request, res: express.Response): void {
readable.on('error', commonReadableHandlerGenerator(req, res));
const data = ((): ISend => {
if (req.query.thumbnail !== undefined) {
return thumbnail(readable, type, req.query.size);
}
return {
contentType: type,
stream: readable
};
})();
if (readable !== data.stream) {
data.stream.on('error', commonReadableHandlerGenerator(req, res));
}
if (req.query.download !== undefined) {
res.header('Content-Disposition', 'attachment');
}
res.send(data);
}
res.header('Content-Type', data.contentType);
async function thumbnail(data: Buffer, type: string, resize: number, res: express.Response): Promise<any> {
if (!/^image\/.*$/.test(type)) {
// TODO: 非同期にしたい。Promise対応してないんだろうか...
data = fs.readFileSync(`${__dirname}/assets/not-an-image.png`);
}
data.stream.pipe(res);
let g = gm(data);
if (resize) {
g = g.resize(resize, resize);
}
g
.compress('jpeg')
.quality(80)
.toBuffer('jpeg', (err, img) => {
if (err !== undefined && err !== null) {
console.error(err);
res.sendStatus(500);
return;
}
res.header('Content-Type', 'image/jpeg');
res.send(img);
});
}
function send(data: Buffer, type: string, req: express.Request, res: express.Response): void {
if (req.query.thumbnail !== undefined) {
thumbnail(data, type, req.query.size, res);
} else {
raw(data, type, req.query.download !== undefined, res);
}
data.stream.on('end', () => {
res.end();
});
}
async function sendFileById(req: express.Request, res: express.Response): Promise<void> {
@ -112,18 +134,9 @@ async function sendFileById(req: express.Request, res: express.Response): Promis
const bucket = await getGridFSBucket();
const buffer = await ((id): Promise<Buffer> => new Promise((resolve, reject) => {
const chunks = [];
const readableStream = bucket.openDownloadStream(id);
readableStream.on('data', chunk => {
chunks.push(chunk);
});
readableStream.on('end', () => {
resolve(Buffer.concat(chunks));
});
}))(fileId);
const readable = bucket.openDownloadStream(fileId);
send(buffer, file.contentType, req, res);
send(readable, file.contentType, req, res);
}
/**