github.com/kaleido-io/firefly@v0.0.0-20210622132723-8b4b6aacb971/kat/src/clients/db-providers/mongodb.ts (about)

     1  // Copyright © 2021 Kaleido, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  import { Db, MongoClient } from 'mongodb';
    16  import { config } from '../../lib/config';
    17  import { databaseCollectionName, IDatabaseProvider, indexes } from '../../lib/interfaces';
    18  import { databaseCollectionIndexes } from '../../lib/utils';
    19  
    20  let db: Db;
    21  let mongoClient: MongoClient;
    22  
    23  export default class MongoDBProvider implements IDatabaseProvider {
    24  
    25    async init() {
    26      try {
    27        mongoClient = await MongoClient.connect(config.mongodb.connectionUrl,
    28          { useNewUrlParser: true, useUnifiedTopology: true, ignoreUndefined: true });
    29        db = mongoClient.db(config.mongodb.databaseName);
    30        for (const [collectionName, indexes] of Object.entries(databaseCollectionIndexes)) {
    31          this.createCollection(collectionName, indexes);
    32        }
    33      } catch (err) {
    34        throw new Error(`Failed to connect to Mongodb. ${err}`);
    35      }
    36    }
    37  
    38    async createCollection(collectionName: string, indexes: indexes) {
    39      try {
    40        for (const index of indexes) {
    41          const fields: { [f: string]: number } = {};
    42          for (const field of index.fields) {
    43            fields[field] = 1; // all ascending currently
    44          }
    45          db.collection(collectionName).createIndex(fields, { unique: !!index.unique });
    46        }
    47      } catch (err) {
    48        throw new Error(`Failed to create collection. ${err}`);
    49      }
    50    }
    51  
    52    count(collectionName: databaseCollectionName, query: object): Promise<number> {
    53      return db.collection(collectionName).find(query).count();
    54    }
    55  
    56    find<T>(collectionName: databaseCollectionName, query: object, sort: object, skip: number, limit: number): Promise<T[]> {
    57      return db.collection(collectionName).find<T>(query, { projection: { _id: 0 } }).sort(sort).skip(skip).limit(limit).toArray();
    58    }
    59  
    60    findOne<T>(collectionName: databaseCollectionName, query: object): Promise<T | null> {
    61      return db.collection(collectionName).findOne<T>(query, { projection: { _id: 0 } });
    62    }
    63  
    64    async updateOne(collectionName: databaseCollectionName, query: object, value: object, upsert: boolean) {
    65      await db.collection(collectionName).updateOne(query, value, { upsert });
    66    }
    67  
    68    shutDown() {
    69      mongoClient.close();
    70    }
    71  
    72  }