Merge pull request #209 from steemit/72-http-socket-support

Http socket support

config.json

 {
+  "transport": "ws",
   "websocket": "wss://steemd.steemit.com",
+  "uri": "https://steemd.steemit.com",
+  "dev_uri": "https://steemd.steemitdev.com",
+  "stage_uri": "https://steemd.steemitstage.com",
   "address_prefix": "STM",
   "chain_id": "0000000000000000000000000000000000000000000000000000000000000000"
 }

doc/README.md

@@ -3,6 +3,7 @@
 - [Install](#install)
 - [Browser](#browser)
 - [Config](#config)
+- [JSON-RPC](#jsonrpc)
 - [Database API](#api)
     - [Subscriptions](#subscriptions)
     - [Tags](#tags)
@@ -54,6 +55,16 @@ steem.config.set('address_prefix','STM');
 steem.config.get('chain_id');
 ```
 
+## JSON-RPC
+Here is how to activate JSON-RPC transport:
+```js
+steem.api.setOptions({
+  transport: 'http',
+  uri: 'https://steemd.steemitdev.com' // Optional, by default https://steemd.steemit.com is used.
+});
+
+```
+
 # API
 
 ## Subscriptions
@@ -517,12 +528,6 @@ steem.api.getFollowCount(account, function(err, result) {
 
 ## Broadcast API
 
-### Broadcast Transaction
-```
-steem.api.broadcastTransaction(trx, function(err, result) {
-  console.log(err, result);
-});
-```
 ### Broadcast Transaction Synchronous
 ```
 steem.api.broadcastTransactionSynchronous(trx, function(err, result) {
@@ -535,12 +540,7 @@ steem.api.broadcastBlock(b, function(err, result) {
   console.log(err, result);
 });
 ```
-### Broadcast Transaction With Callback
-```
-steem.api.broadcastTransactionWithCallback(confirmationCallback, trx, function(err, result) {
-  console.log(err, result);
-});
-```
+
 # Broadcast
 
 ### Account Create

package.json

 {
   "name": "steem",
-  "version": "0.5.20",
+  "version": "0.6.0",
   "description": "Steem.js the JavaScript API for Steem blockchain",
   "main": "lib/index.js",
   "scripts": {
@@ -45,9 +45,10 @@
     "debug": "^2.6.8",
     "detect-node": "^2.0.3",
     "ecurve": "^1.0.5",
+    "isomorphic-fetch": "^2.2.1",
     "lodash": "^4.16.4",
     "secure-random": "^1.1.1",
-    "ws": "^1.1.1"
+    "ws": "^3.0.0"
   },
   "devDependencies": {
     "babel-cli": "^6.16.0",

src/api/index.js

 import EventEmitter from 'events';
 import Promise from 'bluebird';
-import cloneDeep from 'lodash/cloneDeep';
-import defaults from 'lodash/defaults';
-import isNode from 'detect-node';
-import newDebug from 'debug';
 import config from '../config';
 import methods from './methods';
-import { camelCase } from '../utils';
-
-const debugEmitters = newDebug('steem:emitters');
-const debugProtocol = newDebug('steem:protocol');
-const debugSetup = newDebug('steem:setup');
-const debugApiIds = newDebug('steem:api_ids');
-const debugWs = newDebug('steem:ws');
-
-let WebSocket;
-if (isNode) {
-  WebSocket = require('ws'); // eslint-disable-line global-require
-} else if (typeof window !== 'undefined') {
-  WebSocket = window.WebSocket;
-} else {
-  throw new Error('Couldn\'t decide on a `WebSocket` class');
-}
-
-const DEFAULTS = {
-  apiIds: {
-    database_api: 0,
-    login_api: 1,
-    follow_api: 2,
-    network_broadcast_api: 4,
-  },
-  id: 0,
-};
-
-const expectedResponseMs = process.env.EXPECTED_RESPONSE_MS || 2000;
+import transports from './transports';
+import {camelCase} from '../utils';
+import {hash} from '../auth/ecc';
+import {ops} from '../auth/serializer';
 
 class Steem extends EventEmitter {
   constructor(options = {}) {
     super(options);
-    defaults(options, DEFAULTS);
-    this.options = cloneDeep(options);
-
-    this.id = 0;
-    this.inFlight = 0;
-    this.currentP = Promise.fulfilled();
-    this.apiIds = this.options.apiIds;
-    this.isOpen = false;
-    this.releases = [];
-    this.requests = {};
-
-    // A Map of api name to a promise to it's API ID refresh call
-    this.apiIdsP = {};
+    this._setTransport(options);
+    this.options = options;
   }
 
-  setWebSocket(url) {
-    console.warn("steem.api.setWebSocket(url) is now deprecated instead use steem.config.set('websocket',url)");
-    debugSetup('Setting WS', url);
-    config.set('websocket', url);
-    this.stop();
-  }
-
-  start() {
-    if (this.startP) {
-      return this.startP;
-    }
-
-    const startP = new Promise((resolve, reject) => {
-      if (startP !== this.startP) return;
-      const url = config.get('websocket');
-      this.ws = new WebSocket(url);
-
-      const releaseOpen = this.listenTo(this.ws, 'open', () => {
-        debugWs('Opened WS connection with', url);
-        this.isOpen = true;
-        releaseOpen();
-        resolve();
-      });
-
-      const releaseClose = this.listenTo(this.ws, 'close', () => {
-        debugWs('Closed WS connection with', url);
-        this.isOpen = false;
-        delete this.ws;
-        this.stop();
+  _setTransport(options) {
+    if (options.transport) {
+      if (this.transport && this._transportType !== options.transport) {
+        this.transport.stop();
+      }
 
-        if (startP.isPending()) {
-          reject(new Error(
-            'The WS connection was closed before this operation was made'
-          ));
-        }
-      });
+      this._transportType = options.transport;
 
-      const releaseMessage = this.listenTo(this.ws, 'message', (message) => {
-        debugWs('Received message', message.data);
-        const data = JSON.parse(message.data);
-        const id = data.id;
-        const request = this.requests[id];
-        if (!request) {
-          debugWs('Steem.onMessage error: unknown request ', id);
-          return;
+      if (typeof options.transport === 'string') {
+        if (!transports[options.transport]) {
+          throw new TypeError(
+            'Invalid `transport`, valid values are `http`, `ws` or a class',
+          );
         }
-        delete this.requests[id];
-        this.onMessage(data, request);
-      });
-
-      this.releases = this.releases.concat([
-        releaseOpen,
-        releaseClose,
-        releaseMessage,
-      ]);
-    });
-
-    this.startP = startP;
-    this.getApiIds();
+        this.transport = new transports[options.transport](options);
+      } else {
+        this.transport = new options.transport(options);
+      }
+    } else {
+      this.transport = new transports.ws(options);
+    }
+  }
 
-    return startP;
+  start() {
+    return this.transport.start();
   }
 
   stop() {
-    debugSetup('Stopping...');
-    if (this.ws) this.ws.close();
-    this.apiIdsP = {};
-    delete this.startP;
-    delete this.ws;
-    this.releases.forEach((release) => release());
-    this.releases = [];
+    return this.transport.stop();
   }
 
-  listenTo(target, eventName, callback) {
-    debugEmitters('Adding listener for', eventName, 'from', target.constructor.name);
-    if (target.addEventListener) target.addEventListener(eventName, callback);
-    else target.on(eventName, callback);
-
-    return () => {
-      debugEmitters('Removing listener for', eventName, 'from', target.constructor.name);
-      if (target.removeEventListener) target.removeEventListener(eventName, callback);
-      else target.removeListener(eventName, callback);
-    };
+  send(api, data, callback) {
+    return this.transport.send(api, data, callback);
   }
 
-  /**
-   * Refreshes API IDs, populating the `Steem::apiIdsP` map.
-   *
-   * @param {String} [requestName] If provided, only this API will be refreshed
-   * @param {Boolean} [force] If true the API will be forced to refresh, ignoring existing results
-   */
-
-  getApiIds(requestName, force) {
-    if (!force && requestName && this.apiIdsP[requestName]) {
-      return this.apiIdsP[requestName];
-    }
-
-    const apiNamesToRefresh = requestName ? [requestName] : Object.keys(this.apiIds);
-    apiNamesToRefresh.forEach((name) => {
-      debugApiIds('Syncing API ID', name);
-      this.apiIdsP[name] = this.getApiByNameAsync(name).then((result) => {
-        if (result != null) {
-          this.apiIds[name] = result;
-        } else {
-          debugApiIds('Dropped null API ID for', name, result);
-        }
-      });
-    });
-
-    // If `requestName` was provided, only wait for this API ID
-    if (requestName) {
-      return this.apiIdsP[requestName];
-    }
-
-    // Otherwise wait for all of them
-    return Promise.props(this.apiIdsP);
+  setOptions(options) {
+    Object.assign(this.options, options);
+    this._setTransport(this.options);
+    this.transport.setOptions(this.options);
   }
 
-
-  onMessage(message, request) {
-    const {api, data, resolve, reject, start_time} = request;
-    debugWs('-- Steem.onMessage -->', message.id);
-    const errorCause = message.error;
-    if (errorCause) {
-      const err = new Error(
-        // eslint-disable-next-line prefer-template
-        (errorCause.message || 'Failed to complete operation') +
-        ' (see err.payload for the full error payload)'
-      );
-      err.payload = message;
-      reject(err);
-      return;
-    }
-
-    if (api === 'login_api' && data.method === 'login') {
-      debugApiIds(
-        'network_broadcast_api API ID depends on the WS\' session. ' +
-        'Triggering a refresh...'
-      );
-      this.getApiIds('network_broadcast_api', true);
-    }
-
-    debugProtocol('Resolved', api, data, '->', message);
-    this.emit('track-performance', data.method, Date.now() - start_time);
-    delete this.requests[message.id];
-    resolve(message.result);
+  setWebSocket(url) {
+    this.setOptions({websocket: url});
   }
 
-  send(api, data, callback) {
-    debugSetup('Steem::send', api, data);
-    const id = data.id || this.id++;
-    const startP = this.start();
-
-    const apiIdsP = api === 'login_api' && data.method === 'get_api_by_name'
-      ? Promise.fulfilled()
-      : this.getApiIds(api);
-
-    if (api === 'login_api' && data.method === 'get_api_by_name') {
-      debugApiIds('Sending setup message');
-    } else {
-      debugApiIds('Going to wait for setup messages to resolve');
-    }
-
-    this.currentP = Promise.join(startP, apiIdsP)
-      .then(() => new Promise((resolve, reject) => {
-        if (!this.ws) {
-          reject(new Error(
-            'The WS connection was closed while this request was pending'
-          ));
-          return;
-        }
-
-        const payload = JSON.stringify({
-          id,
-          method: 'call',
-          params: [
-            this.apiIds[api],
-            data.method,
-            data.params,
-          ],
-        });
-
-        debugWs('Sending message', payload);
-        this.requests[id] = {
-          api,
-          data,
-          resolve,
-          reject,
-          start_time: Date.now()
-        };
-
-        // this.inFlight += 1;
-        this.ws.send(payload);
-      }))
-      .nodeify(callback);
-
-    return this.currentP;
+  setUri(url) {
+    this.setOptions({uri: url});
   }
 
   streamBlockNumber(mode = 'head', callback, ts = 200) {
@@ -263,8 +74,8 @@ class Steem extends EventEmitter {
     const update = () => {
       if (!running) return;
 
-      this.getDynamicGlobalPropertiesAsync()
-        .then((result) => {
+      this.getDynamicGlobalPropertiesAsync().then(
+        result => {
           const blockId = mode === 'irreversible'
             ? result.last_irreversible_block_num
             : result.head_block_number;
@@ -286,9 +97,11 @@ class Steem extends EventEmitter {
           Promise.delay(ts).then(() => {
             update();
           });
-        }, (err) => {
+        },
+        err => {
           callback(err);
-        });
+        },
+      );
     };
 
     update();
@@ -338,7 +151,7 @@ class Steem extends EventEmitter {
       }
 
       if (result && result.transactions) {
-        result.transactions.forEach((transaction) => {
+        result.transactions.forEach(transaction => {
           callback(null, transaction);
         });
       }
@@ -360,7 +173,7 @@ class Steem extends EventEmitter {
         return;
       }
 
-      transaction.operations.forEach((operation) => {
+      transaction.operations.forEach(operation => {
         callback(null, operation);
       });
     });
@@ -370,35 +183,71 @@ class Steem extends EventEmitter {
 }
 
 // Generate Methods from methods.json
-methods.forEach((method) => {
+methods.forEach(method => {
   const methodName = method.method_name || camelCase(method.method);
   const methodParams = method.params || [];
 
-  Steem.prototype[`${methodName}With`] =
-    function Steem$$specializedSendWith(options, callback) {
-      const params = methodParams.map((param) => options[param]);
-      return this.send(method.api, {
+  Steem.prototype[`${methodName}With`] = function Steem$$specializedSendWith(
+    options,
+    callback,
+  ) {
+    const params = methodParams.map(param => options[param]);
+    return this.send(
+      method.api,
+      {
         method: method.method,
         params,
-      }, callback);
-    };
-
-  Steem.prototype[methodName] =
-    function Steem$specializedSend(...args) {
-      const options = methodParams.reduce((memo, param, i) => {
-        memo[param] = args[i]; // eslint-disable-line no-param-reassign
-        return memo;
-      }, {});
-      const callback = args[methodParams.length];
-
-      return this[`${methodName}With`](options, callback);
-    };
+      },
+      callback,
+    );
+  };
+
+  Steem.prototype[methodName] = function Steem$specializedSend(...args) {
+    const options = methodParams.reduce((memo, param, i) => {
+      memo[param] = args[i]; // eslint-disable-line no-param-reassign
+      return memo;
+    }, {});
+    const callback = args[methodParams.length];
+    return this[`${methodName}With`](options, callback);
+  };
 });
 
+/**
+ * Wrap transaction broadcast: serializes the object and adds error reporting
+ */
+
+Steem.prototype.broadcastTransactionSynchronousWith = function Steem$$specializedSendWith(
+  options,
+  callback,
+) {
+  const trx = options.trx;
+  return this.send(
+    'network_broadcast_api',
+    {
+      method: 'broadcast_transaction_synchronous',
+      params: [trx],
+    },
+    (err, result) => {
+      if (err) {
+        const {signed_transaction} = ops;
+        // console.log('-- broadcastTransactionSynchronous -->', JSON.stringify(signed_transaction.toObject(trx), null, 2));
+        // toObject converts objects into serializable types
+        const trObject = signed_transaction.toObject(trx);
+        const buf = signed_transaction.toBuffer(trx);
+        err.digest = hash.sha256(buf).toString('hex');
+        err.transaction_id = buf.toString('hex');
+        err.transaction = JSON.stringify(trObject);
+        callback(err, '');
+      } else {
+        callback('', result);
+      }
+    },
+  );
+};
+
 Promise.promisifyAll(Steem.prototype);
 
 // Export singleton instance
-const steem = new Steem();
+const steem = new Steem(config);
 exports = module.exports = steem;
 exports.Steem = Steem;
-exports.Steem.DEFAULTS = DEFAULTS;

src/api/transports/base.js

+import Promise from 'bluebird';
+import EventEmitter from 'events';
+import each from 'lodash/each';
+
+export default class Transport extends EventEmitter {
+  constructor(options = {}) {
+    super(options);
+    this.options = options;
+    this.id = 0;
+  }
+
+  setOptions(options) {
+    each(options, (value, key) => {
+      this.options[key] = value;
+    });
+    this.stop();
+  }
+
+  listenTo(target, eventName, callback) {
+    if (target.addEventListener) target.addEventListener(eventName, callback);
+    else target.on(eventName, callback);
+
+    return () => {
+      if (target.removeEventListener)
+        target.removeEventListener(eventName, callback);
+      else target.removeListener(eventName, callback);
+    };
+  }
+
+  send() {}
+  start() {}
+  stop() {}
+}
+
+Promise.promisifyAll(Transport.prototype);

src/api/transports/http.js

+import fetch from 'isomorphic-fetch';
+import newDebug from 'debug';
+
+import Transport from './base';
+
+const debug = newDebug('steem:http');
+
+export default class HttpTransport extends Transport {
+  send(api, data, callback) {
+    debug('Steem::send', api, data);
+    const id = data.id || this.id++;
+    const payload = {
+      id,
+      jsonrpc: '2.0',
+      method: data.method,
+      params: data.params,
+    };
+    fetch(this.options.uri, {
+      method: 'POST',
+      body: JSON.stringify(payload),
+    })
+      .then(res => {
+        debug('Steem::receive', api, data);
+        return res.json();
+      })
+      .then(json => {
+        const err = json.error || '';
+        const result = json.result || '';
+        callback(err, result);
+      })
+      .catch(err => {
+        callback(err, '');
+      });
+  }
+}

src/api/transports/index.js

+import HttpTransport from './http';
+import WsTransport from './ws';
+
+export default {
+  http: HttpTransport,
+  ws: WsTransport,
+};

src/api/transports/ws.js

+import Promise from 'bluebird';
+import defaults from 'lodash/defaults';
+import isNode from 'detect-node';
+import newDebug from 'debug';
+
+import Transport from './base';
+
+let WebSocket;
+if (isNode) {
+  WebSocket = require('ws'); // eslint-disable-line global-require
+} else if (typeof window !== 'undefined') {
+  WebSocket = window.WebSocket;
+} else {
+  throw new Error("Couldn't decide on a `WebSocket` class");
+}
+
+const debug = newDebug('steem:ws');
+
+const DEFAULTS = {
+  apiIds: {
+    database_api: 0,
+    login_api: 1,
+    follow_api: 2,