Initial commit

node_modules/mongodb/lib/operations/create_collection.js

@@ -0,0 +1,102 @@
+'use strict';
+
+const Aspect = require('./operation').Aspect;
+const defineAspects = require('./operation').defineAspects;
+const CommandOperation = require('./command');
+const applyWriteConcern = require('../utils').applyWriteConcern;
+const loadCollection = require('../dynamic_loaders').loadCollection;
+const MongoError = require('../core').MongoError;
+const ReadPreference = require('../core').ReadPreference;
+
+const ILLEGAL_COMMAND_FIELDS = new Set([
+  'w',
+  'wtimeout',
+  'j',
+  'fsync',
+  'autoIndexId',
+  'strict',
+  'serializeFunctions',
+  'pkFactory',
+  'raw',
+  'readPreference',
+  'session',
+  'readConcern',
+  'writeConcern'
+]);
+
+class CreateCollectionOperation extends CommandOperation {
+  constructor(db, name, options) {
+    super(db, options);
+    this.name = name;
+  }
+
+  _buildCommand() {
+    const name = this.name;
+    const options = this.options;
+
+    const cmd = { create: name };
+    for (let n in options) {
+      if (
+        options[n] != null &&
+        typeof options[n] !== 'function' &&
+        !ILLEGAL_COMMAND_FIELDS.has(n)
+      ) {
+        cmd[n] = options[n];
+      }
+    }
+
+    return cmd;
+  }
+
+  execute(callback) {
+    const db = this.db;
+    const name = this.name;
+    const options = this.options;
+    const Collection = loadCollection();
+
+    let listCollectionOptions = Object.assign({ nameOnly: true, strict: false }, options);
+    listCollectionOptions = applyWriteConcern(listCollectionOptions, { db }, listCollectionOptions);
+
+    function done(err) {
+      if (err) {
+        return callback(err);
+      }
+
+      try {
+        callback(
+          null,
+          new Collection(db, db.s.topology, db.databaseName, name, db.s.pkFactory, options)
+        );
+      } catch (err) {
+        callback(err);
+      }
+    }
+
+    const strictMode = listCollectionOptions.strict;
+    if (strictMode) {
+      db.listCollections({ name }, listCollectionOptions)
+        .setReadPreference(ReadPreference.PRIMARY)
+        .toArray((err, collections) => {
+          if (err) {
+            return callback(err);
+          }
+
+          if (collections.length > 0) {
+            return callback(
+              new MongoError(`Collection ${name} already exists. Currently in strict mode.`)
+            );
+          }
+
+          super.execute(done);
+        });
+
+      return;
+    }
+
+    // otherwise just execute the command
+    super.execute(done);
+  }
+}
+
+defineAspects(CreateCollectionOperation, Aspect.WRITE_OPERATION);
+module.exports = CreateCollectionOperation;