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Merged
dr-dimitru merged 2 commits into from
Apr 8, 2025
Merged

Update GridFS exmaple code #900

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c2b7b75
Update GridFS exmaple code
harryadel Mar 28, 2025
3384ff4
Apply the doctor prescription
harryadel Apr 2, 2025
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72 changes: 34 additions & 38 deletions docs/gridfs-bucket-integration.md
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Original file line number Diff line number Diff line change
Expand Up @@ -59,7 +59,7 @@ we also wrap this in a function:
```js
import { MongoInternals } from 'meteor/mongo';

export const createObjectId = ({ gridFsFileId }) => new MongoInternals.NpmModules.mongodb.module.ObjectID(gridFsFileId);
export const createObjectId = ({ gridFsFileId }) => new MongoInternals.NpmModules.mongodb.module.ObjectId(gridFsFileId);
```

### 3. Create an upload handler for the bucket
Expand All @@ -71,50 +71,46 @@ In order to stay flexible enough in the choice of the bucket we use a factory f
import { Meteor } from 'meteor/meteor';
import fs from 'fs';

export const createOnAfterUpload = (bucket) => {
return function onAfterUpload (file) {
export const createOnAfterUpload = bucket =>
function onAfterUpload(file) {
const self = this;

// here you could manipulate your file
// and create a new version, for example a scaled 'thumbnail'
// ...

// then we read all versions we have got so far
Object.keys(file.versions).forEach((versionName) => {
// Process all versions of the uploaded file
Object.keys(file.versions).forEach(versionName => {
const metadata = { ...file.meta, versionName, fileId: file._id };
fs.createReadStream(file.versions[ versionName ].path)

// this is where we upload the binary to the bucket using bucket.openUploadStream
// see http://mongodb.github.io/node-mongodb-native/3.6/api/GridFSBucket.html#openUploadStream
.pipe(bucket.openUploadStream(file.name, {
contentType: file.type || 'binary/octet-stream',
metadata
}))

// and we unlink the file from the fs on any error
// that occurred during the upload to prevent zombie files
.on('error', err => {
console.error(err);
self.unlink(this.collection.findOne(file._id), versionName); // Unlink files from FS
})

// once we are finished, we attach the gridFS Object id on the
// FilesCollection document's meta section and finally unlink the
// upload file from the filesystem
.on('finish', Meteor.bindEnvironment(ver => {
const property = `versions.${versionName}.meta.gridFsFileId`;

self.collection.update(file._id, {
$set: {
[ property ]: ver._id.toHexString(),
const uploadStream = bucket
.openUploadStream(file.name, {
contentType: file.type || 'binary/octet-stream',
metadata,
})
.on('finish', async () => {
const property = `versions.${versionName}.meta.gridFsFileId`

try {
await self.collection.updateAsync(file._id, {
$set: {
[property]: uploadStream.id.toHexString(),
},
})
await self.unlinkAsync(await this.collection.findOneAsync(file._id), versionName);
} catch (error) {
console.error(error);
await self.unlinkAsync(await this.collection.findOneAsync(file._id), versionName);
}
})
.on('error', async (err) => {
console.error(err);
await self.unlinkAsync(await this.collection.findOneAsync(file._id), versionName);
});

self.unlink(this.collection.findOne(file._id), versionName); // Unlink files from FS
}));
const readStream = fs.createReadStream(file.versions[versionName].path).on('open', () => {


readStream.pipe(
uploadStream
);
});
});
};
};
```

### 4. Create download handler
Expand Down