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Object.defineProperty(exports, "__esModule", { value: true });
exports.GridFSBucketWriteStream = void 0;
const stream_1 = require("stream");
const bson_1 = require("../bson");
const error_1 = require("../error");
const utils_1 = require("../utils");
const write_concern_1 = require("./../write_concern");
/**
* A writable stream that enables you to write buffers to GridFS.
*
* Do not instantiate this class directly. Use `openUploadStream()` instead.
* @public
*/
class GridFSBucketWriteStream extends stream_1.Writable {
/**
* @param bucket - Handle for this stream's corresponding bucket
* @param filename - The value of the 'filename' key in the files doc
* @param options - Optional settings.
* @internal
*/
constructor(bucket, filename, options) {
super();
/**
* The document containing information about the inserted file.
* This property is defined _after_ the finish event has been emitted.
* It will remain `null` if an error occurs.
*
* @example
* ```ts
* fs.createReadStream('file.txt')
* .pipe(bucket.openUploadStream('file.txt'))
* .on('finish', function () {
* console.log(this.gridFSFile)
* })
* ```
*/
this.gridFSFile = null;
options = options ?? {};
this.bucket = bucket;
this.chunks = bucket.s._chunksCollection;
this.filename = filename;
this.files = bucket.s._filesCollection;
this.options = options;
this.writeConcern = write_concern_1.WriteConcern.fromOptions(options) || bucket.s.options.writeConcern;
// Signals the write is all done
this.done = false;
this.id = options.id ? options.id : new bson_1.ObjectId();
// properly inherit the default chunksize from parent
this.chunkSizeBytes = options.chunkSizeBytes || this.bucket.s.options.chunkSizeBytes;
this.bufToStore = Buffer.alloc(this.chunkSizeBytes);
this.length = 0;
this.n = 0;
this.pos = 0;
this.state = {
streamEnd: false,
outstandingRequests: 0,
errored: false,
aborted: false
};
if (!this.bucket.s.calledOpenUploadStream) {
this.bucket.s.calledOpenUploadStream = true;
// eslint-disable-next-line github/no-then
checkIndexes(this).then(() => {
this.bucket.s.checkedIndexes = true;
this.bucket.emit('index');
}, utils_1.squashError);
}
}
/**
* @internal
*
* The stream is considered constructed when the indexes are done being created
*/
_construct(callback) {
if (this.bucket.s.checkedIndexes) {
return process.nextTick(callback);
}
this.bucket.once('index', callback);
}
/**
* @internal
* Write a buffer to the stream.
*
* @param chunk - Buffer to write
* @param encoding - Optional encoding for the buffer
* @param callback - Function to call when the chunk was added to the buffer, or if the entire chunk was persisted to MongoDB if this chunk caused a flush.
*/
_write(chunk, encoding, callback) {
doWrite(this, chunk, encoding, callback);
}
/** @internal */
_final(callback) {
if (this.state.streamEnd) {
return process.nextTick(callback);
}
this.state.streamEnd = true;
writeRemnant(this, callback);
}
/**
* Places this write stream into an aborted state (all future writes fail)
* and deletes all chunks that have already been written.
*/
async abort() {
if (this.state.streamEnd) {
// TODO(NODE-3485): Replace with MongoGridFSStreamClosed
throw new error_1.MongoAPIError('Cannot abort a stream that has already completed');
}
if (this.state.aborted) {
// TODO(NODE-3485): Replace with MongoGridFSStreamClosed
throw new error_1.MongoAPIError('Cannot call abort() on a stream twice');
}
this.state.aborted = true;
await this.chunks.deleteMany({ files_id: this.id });
}
}
exports.GridFSBucketWriteStream = GridFSBucketWriteStream;
function handleError(stream, error, callback) {
if (stream.state.errored) {
process.nextTick(callback);
return;
}
stream.state.errored = true;
process.nextTick(callback, error);
}
function createChunkDoc(filesId, n, data) {
return {
_id: new bson_1.ObjectId(),
files_id: filesId,
n,
data
};
}
async function checkChunksIndex(stream) {
const index = { files_id: 1, n: 1 };
let indexes;
try {
indexes = await stream.chunks.listIndexes().toArray();
}
catch (error) {
if (error instanceof error_1.MongoError && error.code === error_1.MONGODB_ERROR_CODES.NamespaceNotFound) {
indexes = [];
}
else {
throw error;
}
}
const hasChunksIndex = !!indexes.find(index => {
const keys = Object.keys(index.key);
if (keys.length === 2 && index.key.files_id === 1 && index.key.n === 1) {
return true;
}
return false;
});
if (!hasChunksIndex) {
await stream.chunks.createIndex(index, {
...stream.writeConcern,
background: true,
unique: true
});
}
}
function checkDone(stream, callback) {
if (stream.done) {
return process.nextTick(callback);
}
if (stream.state.streamEnd && stream.state.outstandingRequests === 0 && !stream.state.errored) {
// Set done so we do not trigger duplicate createFilesDoc
stream.done = true;
// Create a new files doc
const gridFSFile = createFilesDoc(stream.id, stream.length, stream.chunkSizeBytes, stream.filename, stream.options.contentType, stream.options.aliases, stream.options.metadata);
if (isAborted(stream, callback)) {
return;
}
// eslint-disable-next-line github/no-then
stream.files.insertOne(gridFSFile, { writeConcern: stream.writeConcern }).then(() => {
stream.gridFSFile = gridFSFile;
callback();
}, error => handleError(stream, error, callback));
return;
}
process.nextTick(callback);
}
async function checkIndexes(stream) {
const doc = await stream.files.findOne({}, { projection: { _id: 1 } });
if (doc != null) {
// If at least one document exists assume the collection has the required index
return;
}
const index = { filename: 1, uploadDate: 1 };
let indexes;
try {
indexes = await stream.files.listIndexes().toArray();
}
catch (error) {
if (error instanceof error_1.MongoError && error.code === error_1.MONGODB_ERROR_CODES.NamespaceNotFound) {
indexes = [];
}
else {
throw error;
}
}
const hasFileIndex = !!indexes.find(index => {
const keys = Object.keys(index.key);
if (keys.length === 2 && index.key.filename === 1 && index.key.uploadDate === 1) {
return true;
}
return false;
});
if (!hasFileIndex) {
await stream.files.createIndex(index, { background: false });
}
await checkChunksIndex(stream);
}
function createFilesDoc(_id, length, chunkSize, filename, contentType, aliases, metadata) {
const ret = {
_id,
length,
chunkSize,
uploadDate: new Date(),
filename
};
if (contentType) {
ret.contentType = contentType;
}
if (aliases) {
ret.aliases = aliases;
}
if (metadata) {
ret.metadata = metadata;
}
return ret;
}
function doWrite(stream, chunk, encoding, callback) {
if (isAborted(stream, callback)) {
return;
}
const inputBuf = Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk, encoding);
stream.length += inputBuf.length;
// Input is small enough to fit in our buffer
if (stream.pos + inputBuf.length < stream.chunkSizeBytes) {
inputBuf.copy(stream.bufToStore, stream.pos);
stream.pos += inputBuf.length;
process.nextTick(callback);
return;
}
// Otherwise, buffer is too big for current chunk, so we need to flush
// to MongoDB.
let inputBufRemaining = inputBuf.length;
let spaceRemaining = stream.chunkSizeBytes - stream.pos;
let numToCopy = Math.min(spaceRemaining, inputBuf.length);
let outstandingRequests = 0;
while (inputBufRemaining > 0) {
const inputBufPos = inputBuf.length - inputBufRemaining;
inputBuf.copy(stream.bufToStore, stream.pos, inputBufPos, inputBufPos + numToCopy);
stream.pos += numToCopy;
spaceRemaining -= numToCopy;
let doc;
if (spaceRemaining === 0) {
doc = createChunkDoc(stream.id, stream.n, Buffer.from(stream.bufToStore));
++stream.state.outstandingRequests;
++outstandingRequests;
if (isAborted(stream, callback)) {
return;
}
// eslint-disable-next-line github/no-then
stream.chunks.insertOne(doc, { writeConcern: stream.writeConcern }).then(() => {
--stream.state.outstandingRequests;
--outstandingRequests;
if (!outstandingRequests) {
checkDone(stream, callback);
}
}, error => handleError(stream, error, callback));
spaceRemaining = stream.chunkSizeBytes;
stream.pos = 0;
++stream.n;
}
inputBufRemaining -= numToCopy;
numToCopy = Math.min(spaceRemaining, inputBufRemaining);
}
}
function writeRemnant(stream, callback) {
// Buffer is empty, so don't bother to insert
if (stream.pos === 0) {
return checkDone(stream, callback);
}
++stream.state.outstandingRequests;
// Create a new buffer to make sure the buffer isn't bigger than it needs
// to be.
const remnant = Buffer.alloc(stream.pos);
stream.bufToStore.copy(remnant, 0, 0, stream.pos);
const doc = createChunkDoc(stream.id, stream.n, remnant);
// If the stream was aborted, do not write remnant
if (isAborted(stream, callback)) {
return;
}
// eslint-disable-next-line github/no-then
stream.chunks.insertOne(doc, { writeConcern: stream.writeConcern }).then(() => {
--stream.state.outstandingRequests;
checkDone(stream, callback);
}, error => handleError(stream, error, callback));
}
function isAborted(stream, callback) {
if (stream.state.aborted) {
process.nextTick(callback, new error_1.MongoAPIError('Stream has been aborted'));
return true;
}
return false;
}
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