CODEWITHSUNDEEP
node.jscouchdbcouchdb-nano
oomer
oomer

Reputation: 169

Async Await style call working for nano.db.insert but not for nano.db.list

I am using https://github.com/apache/couchdb-nano to interact with my couchdb instance, in my nodeJS project.

const nano = = require('nano')('http://127.0.0.1:5984');
const eventsDb = nano.db.use('events');
const savedEvent = await eventsDb.insert({title: 'ABC'});
console.log('savedEvent:');
console.log(savedEvent.body);

The above works but the following does not (i-e it logs undefined):

const databases = await nano.db.list();
console.log(databases.body);
console.log(databases.rows);

and the following prints a long trace:

const databases = await nano.db.list();
console.log(databases);

The last one above prints the following:

Request {
  _events: [Object: null prototype] { pipe: [Function] },
  _eventsCount: 1,
  _maxListeners: undefined,
  method: 'GET',
  headers:
   { 'content-type': 'application/json',
     accept: 'application/json',
     host: '127.0.0.1:5984' },
  uri:
   Url {
     protocol: 'http:',
     slashes: true,
     auth: null,
     host: '127.0.0.1:5984',
     port: '5984',
     hostname: '127.0.0.1',
     hash: null,
     search: null,
     query: null,
     pathname: '/_all_dbs',
     path: '/_all_dbs',
     href: 'http://127.0.0.1:5984/_all_dbs' },
  readable: true,
  writable: true,
  explicitMethod: true,
  _qs:
   Querystring {
     request: [Circular],
     lib:
      { formats: [Object], parse: [Function], stringify: [Function] },
     useQuerystring: undefined,
     parseOptions: {},
     stringifyOptions: {} },
  _auth:
   Auth {
     request: [Circular],
     hasAuth: false,
     sentAuth: false,
     bearerToken: null,
     user: null,
     pass: null },
  _oauth: OAuth { request: [Circular], params: null },
  _multipart:
   Multipart {
     request: [Circular],
     boundary: '85e773c9-18a7-4dee-8564-776339438318',
     chunked: false,
     body: null },
  _redirect:
   Redirect {
     request: [Circular],
     followRedirect: true,
     followRedirects: true,
     followAllRedirects: false,
     followOriginalHttpMethod: false,
     allowRedirect: [Function],
     maxRedirects: 10,
     redirects: [],
     redirectsFollowed: 0,
     removeRefererHeader: false },
  _tunnel:
   Tunnel {
     request: [Circular],
     proxyHeaderWhiteList:
      [ 'accept',
        'accept-charset',
        'accept-encoding',
        'accept-language',
        'accept-ranges',
        'cache-control',
        'content-encoding',
        'content-language',
        'content-location',
        'content-md5',
        'content-range',
        'content-type',
        'connection',
        'date',
        'expect',
        'max-forwards',
        'pragma',
        'referer',
        'te',
        'user-agent',
        'via' ],
     proxyHeaderExclusiveList: [] },
  setHeader: [Function],
  hasHeader: [Function],
  getHeader: [Function],
  removeHeader: [Function],
  localAddress: undefined,
  pool: {},
  dests: [],
  __isRequestRequest: true,
  proxy: null,
  tunnel: false,
  setHost: true,
  originalCookieHeader: undefined,
  _disableCookies: true,
  _jar: false,
  port: '5984',
  host: '127.0.0.1',
  path: '/_all_dbs',
  httpModule:
   { _connectionListener: [Function: connectionListener],
     METHODS:
      [ 'ACL',
        'BIND',
        'CHECKOUT',
        'CONNECT',
        'COPY',
        'DELETE',
        'GET',
        'HEAD',
        'LINK',
        'LOCK',
        'M-SEARCH',
        'MERGE',
        'MKACTIVITY',
        'MKCALENDAR',
        'MKCOL',
        'MOVE',
        'NOTIFY',
        'OPTIONS',
        'PATCH',
        'POST',
        'PROPFIND',
        'PROPPATCH',
        'PURGE',
        'PUT',
        'REBIND',
        'REPORT',
        'SEARCH',
        'SOURCE',
        'SUBSCRIBE',
        'TRACE',
        'UNBIND',
        'UNLINK',
        'UNLOCK',
        'UNSUBSCRIBE' ],
     STATUS_CODES:
      { '100': 'Continue',
        '101': 'Switching Protocols',
        '102': 'Processing',
        '103': 'Early Hints',
        '200': 'OK',
        '201': 'Created',
        '202': 'Accepted',
        '203': 'Non-Authoritative Information',
        '204': 'No Content',
        '205': 'Reset Content',
        '206': 'Partial Content',
        '207': 'Multi-Status',
        '208': 'Already Reported',
        '226': 'IM Used',
        '300': 'Multiple Choices',
        '301': 'Moved Permanently',
        '302': 'Found',
        '303': 'See Other',
        '304': 'Not Modified',
        '305': 'Use Proxy',
        '307': 'Temporary Redirect',
        '308': 'Permanent Redirect',
        '400': 'Bad Request',
        '401': 'Unauthorized',
        '402': 'Payment Required',
        '403': 'Forbidden',
        '404': 'Not Found',
        '405': 'Method Not Allowed',
        '406': 'Not Acceptable',
        '407': 'Proxy Authentication Required',
        '408': 'Request Timeout',
        '409': 'Conflict',
        '410': 'Gone',
        '411': 'Length Required',
        '412': 'Precondition Failed',
        '413': 'Payload Too Large',
        '414': 'URI Too Long',
        '415': 'Unsupported Media Type',
        '416': 'Range Not Satisfiable',
        '417': 'Expectation Failed',
        '418': 'I\'m a Teapot',
        '421': 'Misdirected Request',
        '422': 'Unprocessable Entity',
        '423': 'Locked',
        '424': 'Failed Dependency',
        '425': 'Unordered Collection',
        '426': 'Upgrade Required',
        '428': 'Precondition Required',
        '429': 'Too Many Requests',
        '431': 'Request Header Fields Too Large',
        '451': 'Unavailable For Legal Reasons',
        '500': 'Internal Server Error',
        '501': 'Not Implemented',
        '502': 'Bad Gateway',
        '503': 'Service Unavailable',
        '504': 'Gateway Timeout',
        '505': 'HTTP Version Not Supported',
        '506': 'Variant Also Negotiates',
        '507': 'Insufficient Storage',
        '508': 'Loop Detected',
        '509': 'Bandwidth Limit Exceeded',
        '510': 'Not Extended',
        '511': 'Network Authentication Required' },
     Agent:
      { [Function: Agent] super_: [Function], defaultMaxSockets: Infinity },
     ClientRequest: { [Function: ClientRequest] super_: [Function] },
     globalAgent:
      Agent {
        _events: [Object],
        _eventsCount: 1,
        _maxListeners: undefined,
        defaultPort: 80,
        protocol: 'http:',
        options: [Object],
        requests: {},
        sockets: {},
        freeSockets: {},
        keepAliveMsecs: 1000,
        keepAlive: false,
        maxSockets: Infinity,
        maxFreeSockets: 256 },
     IncomingMessage: { [Function: IncomingMessage] super_: [Function] },
     OutgoingMessage: { [Function: OutgoingMessage] super_: [Function] },
     Server: { [Function: Server] super_: [Function] },
     ServerResponse: { [Function: ServerResponse] super_: [Function] },
     createServer: [Function: createServer],
     get: [Function: get],
     request: [Function: request],
     maxHeaderSize: [Getter] },
  agentClass:
   { [Function: Agent]
     super_:
      { [Function: EventEmitter]
        EventEmitter: [Circular],
        usingDomains: false,
        defaultMaxListeners: [Getter/Setter],
        init: [Function],
        listenerCount: [Function] },
     defaultMaxSockets: Infinity },
  agent:
   Agent {
     _events: [Object: null prototype] { free: [Function] },
     _eventsCount: 1,
     _maxListeners: undefined,
     defaultPort: 80,
     protocol: 'http:',
     options: { path: null },
     requests: {},
     sockets: {},
     freeSockets: {},
     keepAliveMsecs: 1000,
     keepAlive: false,
     maxSockets: Infinity,
     maxFreeSockets: 256 } }

Can anyone help ? Do all nano api(s) work in async/await style ?

Upvotes: 1

Views: 930

Answers (2)

Glynn Bird
Glynn Bird

Reputation: 5637

The last stack trace tells me that you are receiving a Request object back in your databases variable. This was the default behaviour for Nano prior to version 7.0.0.

If you use the latest Nano (v8.0.1 at the time of writing) then most Nano functions return a Promise instead of a Request object - this will make your async/await code work correctly i.e. your variable databases will receive the body of the HTTP request when the Promise resolves.

To ensure you have the latest Nano use npm install nano or modify your project's package.json file to ensure that the version number requested is current before running npm install.

Upvotes: 2

Hassan Juniedi
Hassan Juniedi

Reputation: 413

You can't use await in that way because await works only inside async functions. try the following:

async function getDatabases() {
  const databases = await nano.db.list();
  console.log(databases.body);
  console.log(databases.rows);
}
getDatabases();

Check this tutorial about async/await to get more familiar async/await tutorial

Upvotes: 0

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