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author | lizi00164331 <li.zi30@zte.com.cn> | 2017-08-07 11:39:39 +0800 |
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committer | lizi00164331 <li.zi30@zte.com.cn> | 2017-08-07 11:39:39 +0800 |
commit | 21d72c4a80fe2937d0c4ddd20624b27adbcd989b (patch) | |
tree | e5013ee12f74f8452e01cbff16e7b0158bc456cb /common/src/main/webapp/usageguide/appserver/node_modules/mongodb/lib/gridfs-stream/index.js | |
parent | f533e73e2ae32e010b16abdcf7985abaf31ab843 (diff) |
Upload the ESR GUI seed code
Issue-ID: AAI-68
Change-Id: Ia50ce0570c2fabecd77199d4e8454f56fe587c4e
Signed-off-by: lizi00164331 <li.zi30@zte.com.cn>
Diffstat (limited to 'common/src/main/webapp/usageguide/appserver/node_modules/mongodb/lib/gridfs-stream/index.js')
-rw-r--r-- | common/src/main/webapp/usageguide/appserver/node_modules/mongodb/lib/gridfs-stream/index.js | 367 |
1 files changed, 367 insertions, 0 deletions
diff --git a/common/src/main/webapp/usageguide/appserver/node_modules/mongodb/lib/gridfs-stream/index.js b/common/src/main/webapp/usageguide/appserver/node_modules/mongodb/lib/gridfs-stream/index.js new file mode 100644 index 0000000..e0e02c0 --- /dev/null +++ b/common/src/main/webapp/usageguide/appserver/node_modules/mongodb/lib/gridfs-stream/index.js @@ -0,0 +1,367 @@ +var Emitter = require('events').EventEmitter; +var GridFSBucketReadStream = require('./download'); +var GridFSBucketWriteStream = require('./upload'); +var shallowClone = require('../utils').shallowClone; +var toError = require('../utils').toError; +var util = require('util'); + +var DEFAULT_GRIDFS_BUCKET_OPTIONS = { + bucketName: 'fs', + chunkSizeBytes: 255 * 1024 +}; + +module.exports = GridFSBucket; + +/** + * Constructor for a streaming GridFS interface + * @class + * @param {Db} db A db handle + * @param {object} [options=null] Optional settings. + * @param {string} [options.bucketName="fs"] The 'files' and 'chunks' collections will be prefixed with the bucket name followed by a dot. + * @param {number} [options.chunkSizeBytes=255 * 1024] Number of bytes stored in each chunk. Defaults to 255KB + * @param {object} [options.writeConcern=null] Optional write concern to be passed to write operations, for instance `{ w: 1 }` + * @param {object} [options.readPreference=null] Optional read preference to be passed to read operations + * @fires GridFSBucketWriteStream#index + * @return {GridFSBucket} + */ + +function GridFSBucket(db, options) { + Emitter.apply(this); + this.setMaxListeners(0); + + if (options && typeof options === 'object') { + options = shallowClone(options); + var keys = Object.keys(DEFAULT_GRIDFS_BUCKET_OPTIONS); + for (var i = 0; i < keys.length; ++i) { + if (!options[keys[i]]) { + options[keys[i]] = DEFAULT_GRIDFS_BUCKET_OPTIONS[keys[i]]; + } + } + } else { + options = DEFAULT_GRIDFS_BUCKET_OPTIONS; + } + + this.s = { + db: db, + options: options, + _chunksCollection: db.collection(options.bucketName + '.chunks'), + _filesCollection: db.collection(options.bucketName + '.files'), + checkedIndexes: false, + calledOpenUploadStream: false, + promiseLibrary: db.s.promiseLibrary || + (typeof global.Promise == 'function' ? global.Promise : require('es6-promise').Promise) + }; +} + +util.inherits(GridFSBucket, Emitter); + +/** + * When the first call to openUploadStream is made, the upload stream will + * check to see if it needs to create the proper indexes on the chunks and + * files collections. This event is fired either when 1) it determines that + * no index creation is necessary, 2) when it successfully creates the + * necessary indexes. + * + * @event GridFSBucket#index + * @type {Error} + */ + +/** + * Returns a writable stream (GridFSBucketWriteStream) for writing + * buffers to GridFS. The stream's 'id' property contains the resulting + * file's id. + * @method + * @param {string} filename The value of the 'filename' key in the files doc + * @param {object} [options=null] Optional settings. + * @param {number} [options.chunkSizeBytes=null] Optional overwrite this bucket's chunkSizeBytes for this file + * @param {object} [options.metadata=null] Optional object to store in the file document's `metadata` field + * @param {string} [options.contentType=null] Optional string to store in the file document's `contentType` field + * @param {array} [options.aliases=null] Optional array of strings to store in the file document's `aliases` field + * @return {GridFSBucketWriteStream} + */ + +GridFSBucket.prototype.openUploadStream = function(filename, options) { + if (options) { + options = shallowClone(options); + } else { + options = {}; + } + if (!options.chunkSizeBytes) { + options.chunkSizeBytes = this.s.options.chunkSizeBytes; + } + return new GridFSBucketWriteStream(this, filename, options); +}; + +/** + * Returns a writable stream (GridFSBucketWriteStream) for writing + * buffers to GridFS for a custom file id. The stream's 'id' property contains the resulting + * file's id. + * @method + * @param {string|number|object} id A custom id used to identify the file + * @param {string} filename The value of the 'filename' key in the files doc + * @param {object} [options=null] Optional settings. + * @param {number} [options.chunkSizeBytes=null] Optional overwrite this bucket's chunkSizeBytes for this file + * @param {object} [options.metadata=null] Optional object to store in the file document's `metadata` field + * @param {string} [options.contentType=null] Optional string to store in the file document's `contentType` field + * @param {array} [options.aliases=null] Optional array of strings to store in the file document's `aliases` field + * @return {GridFSBucketWriteStream} + */ + +GridFSBucket.prototype.openUploadStreamWithId = function(id, filename, options) { + if (options) { + options = shallowClone(options); + } else { + options = {}; + } + + if (!options.chunkSizeBytes) { + options.chunkSizeBytes = this.s.options.chunkSizeBytes; + } + + options.id = id; + + return new GridFSBucketWriteStream(this, filename, options); +}; + +/** + * Returns a readable stream (GridFSBucketReadStream) for streaming file + * data from GridFS. + * @method + * @param {ObjectId} id The id of the file doc + * @param {Object} [options=null] Optional settings. + * @param {Number} [options.start=null] Optional 0-based offset in bytes to start streaming from + * @param {Number} [options.end=null] Optional 0-based offset in bytes to stop streaming before + * @return {GridFSBucketReadStream} + */ + +GridFSBucket.prototype.openDownloadStream = function(id, options) { + var filter = { _id: id }; + options = { + start: options && options.start, + end: options && options.end + }; + + return new GridFSBucketReadStream(this.s._chunksCollection, + this.s._filesCollection, this.s.options.readPreference, filter, options); +}; + +/** + * Deletes a file with the given id + * @method + * @param {ObjectId} id The id of the file doc + * @param {GridFSBucket~errorCallback} [callback] + */ + +GridFSBucket.prototype.delete = function(id, callback) { + if (typeof callback === 'function') { + return _delete(this, id, callback); + } + + var _this = this; + return new this.s.promiseLibrary(function(resolve, reject) { + _delete(_this, id, function(error, res) { + if (error) { + reject(error); + } else { + resolve(res); + } + }); + }); +}; + +/** + * @ignore + */ + +function _delete(_this, id, callback) { + _this.s._filesCollection.deleteOne({ _id: id }, function(error, res) { + if (error) { + return callback(error); + } + + _this.s._chunksCollection.deleteMany({ files_id: id }, function(error) { + if (error) { + return callback(error); + } + + // Delete orphaned chunks before returning FileNotFound + if (!res.result.n) { + var errmsg = 'FileNotFound: no file with id ' + id + ' found'; + return callback(new Error(errmsg)); + } + + callback(); + }); + }); +} + +/** + * Convenience wrapper around find on the files collection + * @method + * @param {Object} filter + * @param {Object} [options=null] Optional settings for cursor + * @param {number} [options.batchSize=null] Optional batch size for cursor + * @param {number} [options.limit=null] Optional limit for cursor + * @param {number} [options.maxTimeMS=null] Optional maxTimeMS for cursor + * @param {boolean} [options.noCursorTimeout=null] Optionally set cursor's `noCursorTimeout` flag + * @param {number} [options.skip=null] Optional skip for cursor + * @param {object} [options.sort=null] Optional sort for cursor + * @return {Cursor} + */ + +GridFSBucket.prototype.find = function(filter, options) { + filter = filter || {}; + options = options || {}; + + var cursor = this.s._filesCollection.find(filter); + + if (options.batchSize != null) { + cursor.batchSize(options.batchSize); + } + if (options.limit != null) { + cursor.limit(options.limit); + } + if (options.maxTimeMS != null) { + cursor.maxTimeMS(options.maxTimeMS); + } + if (options.noCursorTimeout != null) { + cursor.addCursorFlag('noCursorTimeout', options.noCursorTimeout); + } + if (options.skip != null) { + cursor.skip(options.skip); + } + if (options.sort != null) { + cursor.sort(options.sort); + } + + return cursor; +}; + +/** + * Returns a readable stream (GridFSBucketReadStream) for streaming the + * file with the given name from GridFS. If there are multiple files with + * the same name, this will stream the most recent file with the given name + * (as determined by the `uploadDate` field). You can set the `revision` + * option to change this behavior. + * @method + * @param {String} filename The name of the file to stream + * @param {Object} [options=null] Optional settings + * @param {number} [options.revision=-1] The revision number relative to the oldest file with the given filename. 0 gets you the oldest file, 1 gets you the 2nd oldest, -1 gets you the newest. + * @param {Number} [options.start=null] Optional 0-based offset in bytes to start streaming from + * @param {Number} [options.end=null] Optional 0-based offset in bytes to stop streaming before + * @return {GridFSBucketReadStream} + */ + +GridFSBucket.prototype.openDownloadStreamByName = function(filename, options) { + var sort = { uploadDate: -1 }; + var skip = null; + if (options && options.revision != null) { + if (options.revision >= 0) { + sort = { uploadDate: 1 }; + skip = options.revision; + } else { + skip = -options.revision - 1; + } + } + + var filter = { filename: filename }; + options = { + sort: sort, + skip: skip, + start: options && options.start, + end: options && options.end + }; + return new GridFSBucketReadStream(this.s._chunksCollection, + this.s._filesCollection, this.s.options.readPreference, filter, options); +}; + +/** + * Renames the file with the given _id to the given string + * @method + * @param {ObjectId} id the id of the file to rename + * @param {String} filename new name for the file + * @param {GridFSBucket~errorCallback} [callback] + */ + +GridFSBucket.prototype.rename = function(id, filename, callback) { + if (typeof callback === 'function') { + return _rename(this, id, filename, callback); + } + + var _this = this; + return new this.s.promiseLibrary(function(resolve, reject) { + _rename(_this, id, filename, function(error, res) { + if (error) { + reject(error); + } else { + resolve(res); + } + }); + }); +}; + +/** + * @ignore + */ + +function _rename(_this, id, filename, callback) { + var filter = { _id: id }; + var update = { $set: { filename: filename } }; + _this.s._filesCollection.updateOne(filter, update, function(error, res) { + if (error) { + return callback(error); + } + if (!res.result.n) { + return callback(toError('File with id ' + id + ' not found')); + } + callback(); + }); +} + +/** + * Removes this bucket's files collection, followed by its chunks collection. + * @method + * @param {GridFSBucket~errorCallback} [callback] + */ + +GridFSBucket.prototype.drop = function(callback) { + if (typeof callback === 'function') { + return _drop(this, callback); + } + + var _this = this; + return new this.s.promiseLibrary(function(resolve, reject) { + _drop(_this, function(error, res) { + if (error) { + reject(error); + } else { + resolve(res); + } + }); + }); +}; + +/** + * @ignore + */ + +function _drop(_this, callback) { + _this.s._filesCollection.drop(function(error) { + if (error) { + return callback(error); + } + _this.s._chunksCollection.drop(function(error) { + if (error) { + return callback(error); + } + + return callback(); + }); + }); +} + +/** + * Callback format for all GridFSBucket methods that can accept a callback. + * @callback GridFSBucket~errorCallback + * @param {MongoError} error An error instance representing any errors that occurred + */ |