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"use strict";
var Query = require('../connection/commands').Query
, retrieveBSON = require('../connection/utils').retrieveBSON
, f = require('util').format
, MongoError = require('../error')
, getReadPreference = require('./shared').getReadPreference;
var BSON = retrieveBSON(),
Long = BSON.Long;
var WireProtocol = function(legacyWireProtocol) {
this.legacyWireProtocol = legacyWireProtocol;
}
//
// Execute a write operation
var executeWrite = function(pool, bson, type, opsField, ns, ops, options, callback) {
if(ops.length == 0) throw new MongoError("insert must contain at least one document");
if(typeof options == 'function') {
callback = options;
options = {};
options = options || {};
}
// Split the ns up to get db and collection
var p = ns.split(".");
var d = p.shift();
// Options
var ordered = typeof options.ordered == 'boolean' ? options.ordered : true;
var writeConcern = options.writeConcern;
// return skeleton
var writeCommand = {};
writeCommand[type] = p.join('.');
writeCommand[opsField] = ops;
writeCommand.ordered = ordered;
// Did we specify a write concern
if(writeConcern && Object.keys(writeConcern).length > 0) {
writeCommand.writeConcern = writeConcern;
}
// If we have collation passed in
if(options.collation) {
for(var i = 0; i < writeCommand[opsField].length; i++) {
if(!writeCommand[opsField][i].collation) {
writeCommand[opsField][i].collation = options.collation;
}
}
}
// Do we have bypassDocumentValidation set, then enable it on the write command
if(typeof options.bypassDocumentValidation == 'boolean') {
writeCommand.bypassDocumentValidation = options.bypassDocumentValidation;
}
// Options object
var opts = { command: true };
var queryOptions = { checkKeys : false, numberToSkip: 0, numberToReturn: 1 };
if(type == 'insert') queryOptions.checkKeys = true;
// Ensure we support serialization of functions
if(options.serializeFunctions) queryOptions.serializeFunctions = options.serializeFunctions;
// Do not serialize the undefined fields
if(options.ignoreUndefined) queryOptions.ignoreUndefined = options.ignoreUndefined;
try {
// Create write command
var cmd = new Query(bson, f("%s.$cmd", d), writeCommand, queryOptions);
// Execute command
pool.write(cmd, opts, callback);
} catch(err) {
callback(err);
}
}
//
// Needs to support legacy mass insert as well as ordered/unordered legacy
// emulation
//
WireProtocol.prototype.insert = function(pool, ismaster, ns, bson, ops, options, callback) {
executeWrite(pool, bson, 'insert', 'documents', ns, ops, options, callback);
}
WireProtocol.prototype.update = function(pool, ismaster, ns, bson, ops, options, callback) {
executeWrite(pool, bson, 'update', 'updates', ns, ops, options, callback);
}
WireProtocol.prototype.remove = function(pool, ismaster, ns, bson, ops, options, callback) {
executeWrite(pool, bson, 'delete', 'deletes', ns, ops, options, callback);
}
WireProtocol.prototype.killCursor = function(bson, ns, cursorId, pool, callback) {
// Build command namespace
var parts = ns.split(/\./);
// Command namespace
var commandns = f('%s.$cmd', parts.shift());
// Create getMore command
var killcursorCmd = {
killCursors: parts.join('.'),
cursors: [cursorId]
}
// Build Query object
var query = new Query(bson, commandns, killcursorCmd, {
numberToSkip: 0, numberToReturn: -1
, checkKeys: false, returnFieldSelector: null
});
// Set query flags
query.slaveOk = true;
// Kill cursor callback
var killCursorCallback = function(err, result) {
if(err) {
if(typeof callback != 'function') return;
return callback(err);
}
// Result
var r = result.message;
// If we have a timed out query or a cursor that was killed
if((r.responseFlags & (1 << 0)) != 0) {
if(typeof callback != 'function') return;
return callback(new MongoError("cursor killed or timed out"), null);
}
if(!Array.isArray(r.documents) || r.documents.length == 0) {
if(typeof callback != 'function') return;
return callback(new MongoError(f('invalid killCursors result returned for cursor id %s', cursorId)));
}
// Return the result
if(typeof callback == 'function') {
callback(null, r.documents[0]);
}
}
// Execute the kill cursor command
if(pool && pool.isConnected()) {
pool.write(query, {
command: true
}, killCursorCallback);
}
}
WireProtocol.prototype.getMore = function(bson, ns, cursorState, batchSize, raw, connection, options, callback) {
options = options || {};
// Build command namespace
var parts = ns.split(/\./);
// Command namespace
var commandns = f('%s.$cmd', parts.shift());
// Create getMore command
var getMoreCmd = {
getMore: cursorState.cursorId,
collection: parts.join('.'),
batchSize: Math.abs(batchSize)
}
if(cursorState.cmd.tailable
&& typeof cursorState.cmd.maxAwaitTimeMS == 'number') {
getMoreCmd.maxTimeMS = cursorState.cmd.maxAwaitTimeMS;
}
// Build Query object
var query = new Query(bson, commandns, getMoreCmd, {
numberToSkip: 0, numberToReturn: -1
, checkKeys: false, returnFieldSelector: null
});
// Set query flags
query.slaveOk = true;
// Query callback
var queryCallback = function(err, result) {
if(err) return callback(err);
// Get the raw message
var r = result.message;
// If we have a timed out query or a cursor that was killed
if((r.responseFlags & (1 << 0)) != 0) {
return callback(new MongoError("cursor killed or timed out"), null);
}
// Raw, return all the extracted documents
if(raw) {
cursorState.documents = r.documents;
cursorState.cursorId = r.cursorId;
return callback(null, r.documents);
}
// We have an error detected
if(r.documents[0].ok == 0) {
return callback(MongoError.create(r.documents[0]));
}
// Ensure we have a Long valid cursor id
var cursorId = typeof r.documents[0].cursor.id == 'number'
? Long.fromNumber(r.documents[0].cursor.id)
: r.documents[0].cursor.id;
// Set all the values
cursorState.documents = r.documents[0].cursor.nextBatch;
cursorState.cursorId = cursorId;
// Return the result
callback(null, r.documents[0], r.connection);
}
// Query options
var queryOptions = { command: true };
// If we have a raw query decorate the function
if(raw) {
queryOptions.raw = raw;
}
// Add the result field needed
queryOptions.documentsReturnedIn = 'nextBatch';
// Check if we need to promote longs
if(typeof cursorState.promoteLongs == 'boolean') {
queryOptions.promoteLongs = cursorState.promoteLongs;
}
if(typeof cursorState.promoteValues == 'boolean') {
queryCallback.promoteValues = cursorState.promoteValues;
}
if(typeof cursorState.promoteBuffers == 'boolean') {
queryCallback.promoteBuffers = cursorState.promoteBuffers;
}
// Write out the getMore command
connection.write(query, queryOptions, queryCallback);
}
WireProtocol.prototype.command = function(bson, ns, cmd, cursorState, topology, options) {
// Establish type of command
if(cmd.find) {
// Create the find command
var query = executeFindCommand(bson, ns, cmd, cursorState, topology, options)
// Mark the cmd as virtual
cmd.virtual = false;
// Signal the documents are in the firstBatch value
query.documentsReturnedIn = 'firstBatch';
// Return the query
return query;
} else if(cursorState.cursorId != null) {
return;
} else if(cmd) {
return setupCommand(bson, ns, cmd, cursorState, topology, options);
} else {
throw new MongoError(f("command %s does not return a cursor", JSON.stringify(cmd)));
}
}
// // Command
// {
// find: ns
// , query: <object>
// , limit: <n>
// , fields: <object>
// , skip: <n>
// , hint: <string>
// , explain: <boolean>
// , snapshot: <boolean>
// , batchSize: <n>
// , returnKey: <boolean>
// , maxScan: <n>
// , min: <n>
// , max: <n>
// , showDiskLoc: <boolean>
// , comment: <string>
// , maxTimeMS: <n>
// , raw: <boolean>
// , readPreference: <ReadPreference>
// , tailable: <boolean>
// , oplogReplay: <boolean>
// , noCursorTimeout: <boolean>
// , awaitdata: <boolean>
// , exhaust: <boolean>
// , partial: <boolean>
// }
// FIND/GETMORE SPEC
// {
// “find”: <string>,
// “filter”: { ... },
// “sort”: { ... },
// “projection”: { ... },
// “hint”: { ... },
// “skip”: <int>,
// “limit”: <int>,
// “batchSize”: <int>,
// “singleBatch”: <bool>,
// “comment”: <string>,
// “maxScan”: <int>,
// “maxTimeMS”: <int>,
// “max”: { ... },
// “min”: { ... },
// “returnKey”: <bool>,
// “showRecordId”: <bool>,
// “snapshot”: <bool>,
// “tailable”: <bool>,
// “oplogReplay”: <bool>,
// “noCursorTimeout”: <bool>,
// “awaitData”: <bool>,
// “partial”: <bool>,
// “$readPreference”: { ... }
// }
//
// Execute a find command
var executeFindCommand = function(bson, ns, cmd, cursorState, topology, options) {
// Ensure we have at least some options
options = options || {};
// Get the readPreference
var readPreference = getReadPreference(cmd, options);
// Set the optional batchSize
cursorState.batchSize = cmd.batchSize || cursorState.batchSize;
// Build command namespace
var parts = ns.split(/\./);
// Command namespace
var commandns = f('%s.$cmd', parts.shift());
// Build actual find command
var findCmd = {
find: parts.join('.')
};
// I we provided a filter
if(cmd.query) {
// Check if the user is passing in the $query parameter
if(cmd.query['$query']) {
findCmd.filter = cmd.query['$query'];
} else {
findCmd.filter = cmd.query;
}
}
// Sort value
var sortValue = cmd.sort;
// Handle issue of sort being an Array
if(Array.isArray(sortValue)) {
var sortObject = {};
if(sortValue.length > 0 && !Array.isArray(sortValue[0])) {
var sortDirection = sortValue[1];
// Translate the sort order text
if(sortDirection == 'asc') {
sortDirection = 1;
} else if(sortDirection == 'desc') {
sortDirection = -1;
}
// Set the sort order
sortObject[sortValue[0]] = sortDirection;
} else {
for(var i = 0; i < sortValue.length; i++) {
sortDirection = sortValue[i][1];
// Translate the sort order text
if(sortDirection == 'asc') {
sortDirection = 1;
} else if(sortDirection == 'desc') {
sortDirection = -1;
}
// Set the sort order
sortObject[sortValue[i][0]] = sortDirection;
}
}
sortValue = sortObject;
}
// Add sort to command
if(cmd.sort) findCmd.sort = sortValue;
// Add a projection to the command
if(cmd.fields) findCmd.projection = cmd.fields;
// Add a hint to the command
if(cmd.hint) findCmd.hint = cmd.hint;
// Add a skip
if(cmd.skip) findCmd.skip = cmd.skip;
// Add a limit
if(cmd.limit) findCmd.limit = cmd.limit;
// Add a batchSize
if(typeof cmd.batchSize == 'number') findCmd.batchSize = Math.abs(cmd.batchSize);
// Check if we wish to have a singleBatch
if(cmd.limit < 0) {
findCmd.limit = Math.abs(cmd.limit);
findCmd.singleBatch = true;
}
// If we have comment set
if(cmd.comment) findCmd.comment = cmd.comment;
// If we have maxScan
if(cmd.maxScan) findCmd.maxScan = cmd.maxScan;
// If we have maxTimeMS set
if(cmd.maxTimeMS) findCmd.maxTimeMS = cmd.maxTimeMS;
// If we have min
if(cmd.min) findCmd.min = cmd.min;
// If we have max
if(cmd.max) findCmd.max = cmd.max;
// If we have returnKey set
if(cmd.returnKey) findCmd.returnKey = cmd.returnKey;
// If we have showDiskLoc set
if(cmd.showDiskLoc) findCmd.showRecordId = cmd.showDiskLoc;
// If we have snapshot set
if(cmd.snapshot) findCmd.snapshot = cmd.snapshot;
// If we have tailable set
if(cmd.tailable) findCmd.tailable = cmd.tailable;
// If we have oplogReplay set
if(cmd.oplogReplay) findCmd.oplogReplay = cmd.oplogReplay;
// If we have noCursorTimeout set
if(cmd.noCursorTimeout) findCmd.noCursorTimeout = cmd.noCursorTimeout;
// If we have awaitData set
if(cmd.awaitData) findCmd.awaitData = cmd.awaitData;
if(cmd.awaitdata) findCmd.awaitData = cmd.awaitdata;
// If we have partial set
if(cmd.partial) findCmd.partial = cmd.partial;
// If we have collation passed in
if(cmd.collation) findCmd.collation = cmd.collation;
// If we have explain, we need to rewrite the find command
// to wrap it in the explain command
if(cmd.explain) {
findCmd = {
explain: findCmd
}
}
// Did we provide a readConcern
if(cmd.readConcern) findCmd.readConcern = cmd.readConcern;
// Set up the serialize and ignoreUndefined fields
var serializeFunctions = typeof options.serializeFunctions == 'boolean'
? options.serializeFunctions : false;
var ignoreUndefined = typeof options.ignoreUndefined == 'boolean'
? options.ignoreUndefined : false;
// We have a Mongos topology, check if we need to add a readPreference
if(topology.type == 'mongos'
&& readPreference
&& readPreference.preference != 'primary') {
findCmd = {
'$query': findCmd,
'$readPreference': readPreference.toJSON()
};
}
// Build Query object
var query = new Query(bson, commandns, findCmd, {
numberToSkip: 0, numberToReturn: 1
, checkKeys: false, returnFieldSelector: null
, serializeFunctions: serializeFunctions, ignoreUndefined: ignoreUndefined
});
// Set query flags
query.slaveOk = readPreference.slaveOk();
// Return the query
return query;
}
//
// Set up a command cursor
var setupCommand = function(bson, ns, cmd, cursorState, topology, options) {
// Set empty options object
options = options || {}
// Get the readPreference
var readPreference = getReadPreference(cmd, options);
// Final query
var finalCmd = {};
for(var name in cmd) {
finalCmd[name] = cmd[name];
}
// Build command namespace
var parts = ns.split(/\./);
// Serialize functions
var serializeFunctions = typeof options.serializeFunctions == 'boolean'
? options.serializeFunctions : false;
// Set up the serialize and ignoreUndefined fields
var ignoreUndefined = typeof options.ignoreUndefined == 'boolean'
? options.ignoreUndefined : false;
// We have a Mongos topology, check if we need to add a readPreference
if(topology.type == 'mongos'
&& readPreference
&& readPreference.preference != 'primary') {
finalCmd = {
'$query': finalCmd,
'$readPreference': readPreference.toJSON()
};
}
// Build Query object
var query = new Query(bson, f('%s.$cmd', parts.shift()), finalCmd, {
numberToSkip: 0, numberToReturn: -1
, checkKeys: false, serializeFunctions: serializeFunctions
, ignoreUndefined: ignoreUndefined
});
// Set query flags
query.slaveOk = readPreference.slaveOk();
// Return the query
return query;
}
module.exports = WireProtocol;
|