Implement more of chrome.serial on the Mojo SerialConnection.

extensions/renderer/resources/serial_service.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 define('serial_service', [
     'content/public/renderer/service_provider',
     'device/serial/serial.mojom',
+    'mojo/public/js/bindings/core',
     'mojo/public/js/bindings/router',
-], function(serviceProvider, serialMojom, routerModule) {
+], function(serviceProvider, serialMojom, core, routerModule) {
+  /**
+   * A Javascript client for the serial service and connection Mojo services.
+   *
+   * This provides a thick client around the Mojo services, exposing a JS-style
+   * interface to serial connections and information about serial devices. This
+   * converts parameters and result between the Apps serial API types and the
+   * Mojo types.
+   */
 
-  function defineService(proxy, handle) {
-    if (!handle)
-      handle = serviceProvider.connectToService(proxy.NAME_);
-    var router = new routerModule.Router(handle);
-    var service = new proxy(router);
-    return {
-      service: service,
-      router: router,
-    };
-  }
-
-  var service = defineService(serialMojom.SerialServiceProxy).service;
+  var service = new serialMojom.SerialServiceProxy(new routerModule.Router(
+      serviceProvider.connectToService(serialMojom.SerialServiceProxy.NAME_)));
 
   function getDevices() {
     return service.getDevices().then(function(response) {
       return $Array.map(response.devices, function(device) {
         var result = {path: device.path || ''};
         if (device.has_vendor_id)
           result.vendorId = device.vendor_id;
         if (device.has_product_id)
           result.productId = device.product_id;
         if (device.display_name)
           result.displayName = device.display_name;
         return result;
       });
     });
   }
 
+  var DEFAULT_CLIENT_OPTIONS = {
+    persistent: false,
+    name: '',
+    receiveTimeout: 0,
+    sendTimeout: 0,
+    bufferSize: 4096,
+  };
+
+  var DATA_BITS_TO_MOJO = {
+    undefined: serialMojom.DataBits.NONE,
+    'seven': serialMojom.DataBits.SEVEN,
+    'eight': serialMojom.DataBits.EIGHT,
+  };
+  var STOP_BITS_TO_MOJO = {
+    undefined: serialMojom.StopBits.NONE,
+    'one': serialMojom.StopBits.ONE,
+    'two': serialMojom.StopBits.TWO,
+  };
+  var PARITY_BIT_TO_MOJO = {
+    undefined: serialMojom.ParityBit.NONE,
+    'no': serialMojom.ParityBit.NO,
+    'odd': serialMojom.ParityBit.ODD,
+    'even': serialMojom.ParityBit.EVEN,
+  };
+
+  function invertMap(input) {
+    var output = {};
+    for (var key in input) {
+      if (key == 'undefined')
+        output[input[key]] = undefined;
+      else
+        output[input[key]] = key;
+    }
+    return output;
+  }
+  var DATA_BITS_FROM_MOJO = invertMap(DATA_BITS_TO_MOJO);
+  var STOP_BITS_FROM_MOJO = invertMap(STOP_BITS_TO_MOJO);
+  var PARITY_BIT_FROM_MOJO = invertMap(PARITY_BIT_TO_MOJO);
+
+  function getServiceOptions(options) {
+    var out = {};
+    if (options.dataBits)
+      out.data_bits = DATA_BITS_TO_MOJO[options.dataBits];
+    if (options.stopBits)
+      out.stop_bits = STOP_BITS_TO_MOJO[options.stopBits];
+    if (options.parityBit)
+      out.parity_bit = PARITY_BIT_TO_MOJO[options.parityBit];
+    if ('ctsFlowControl' in options) {
+      out.has_cts_flow_control = true;
+      out.cts_flow_control = options.ctsFlowControl;
+    }
+    if ('bitrate' in options)
+      out.bitrate = options.bitrate;
+    return out;
+  }
+
+  function convertServiceInfo(result) {
+    if (!result.info)
+      throw new Error('Failed to get ConnectionInfo.');
+    return {
+      ctsFlowControl: !!result.info.cts_flow_control,
+      bitrate: result.info.bitrate || undefined,
+      dataBits: DATA_BITS_FROM_MOJO[result.info.data_bits],
+      stopBits: STOP_BITS_FROM_MOJO[result.info.stop_bits],
+      parityBit: PARITY_BIT_FROM_MOJO[result.info.parity_bit],
+    };
+  }
+
+  function Connection(remoteConnection, router, id, options) {
+    this.remoteConnection_ = remoteConnection;
+    this.router_ = router;
+    this.id_ = id;
+    getConnections().then(function(connections) {
+      connections[this.id_] = this;
+    }.bind(this));
+    this.paused_ = false;
+    this.options_ = {};
+    for (var key in DEFAULT_CLIENT_OPTIONS) {
+      this.options_[key] = DEFAULT_CLIENT_OPTIONS[key];
+    }
+    this.setClientOptions_(options);
+  }
+
+  Connection.create = function(path, options) {
+    options = options || {};
+    var serviceOptions = getServiceOptions(options);
+    var pipe = core.createMessagePipe();
+    service.connect(path, serviceOptions, pipe.handle0);
+    var router = new routerModule.Router(pipe.handle1);
+    var connection = new serialMojom.ConnectionProxy(router);
+    return connection.getInfo().then(convertServiceInfo).then(
+        function(info) {
+      return Promise.all([info, allocateConnectionId()]);
+    }).catch(function(e) {
+      router.close();
+      throw e;
+    }).then(function(results) {
+      var info = results[0];
+      var id = results[1];
+      var serialConnectionClient = new Connection(
+          connection, router, id, options);
+      var clientInfo = serialConnectionClient.getClientInfo_();
+      for (var key in clientInfo) {
+        info[key] = clientInfo[key];
+      }
+      return {
+        connection: serialConnectionClient,
+        info: info,
+      };
+    });
+  };
+
+  Connection.prototype.close = function() {
+    this.router_.close();
+    return getConnections().then(function(connections) {
+      delete connections[this.id_]
+      return true;
+    }.bind(this));
+  };
+
+  Connection.prototype.getClientInfo_ = function() {
+    var info = {
+      connectionId: this.id_,
+      paused: this.paused_,
+    }
+    for (var key in this.options_) {
+      info[key] = this.options_[key];
+    }
+    return info;
+  };
+
+  Connection.prototype.getInfo = function() {
+    var info = this.getClientInfo_();
+    return this.remoteConnection_.getInfo().then(convertServiceInfo).then(
+        function(result) {
+      for (var key in result) {
+        info[key] = result[key];
+      }
+      return info;
+    }).catch(function() {
+      return info;
+    });
+  };
+
+  Connection.prototype.setClientOptions_ = function(options) {
+    if ('name' in options)
+      this.options_.name = options.name;
+    if ('receiveTimeout' in options)
+      this.options_.receiveTimeout = options.receiveTimeout;
+    if ('sendTimeout' in options)
+      this.options_.sendTimeout = options.sendTimeout;
+    if ('bufferSize' in options)
+      this.options_.bufferSize = options.bufferSize;
+  };
+
+  Connection.prototype.setOptions = function(options) {
+    this.setClientOptions_(options);
+    var serviceOptions = getServiceOptions(options);
+    if ($Object.keys(serviceOptions).length == 0)
+      return true;
+    return this.remoteConnection_.setOptions(serviceOptions).then(
+        function(result) {
+      return !!result.success;
+    }).catch(function() {
+      return false;
+    });
+  };
+
+  Connection.prototype.getControlSignals = function() {
+    return this.remoteConnection_.getControlSignals().then(function(result) {
+      if (!result.signals)
+        throw new Error('Failed to get control signals.');
+      var signals = result.signals;
+      return {
+        dcd: !!signals.dcd,
+        cts: !!signals.cts,
+        ri: !!signals.ri,
+        dsr: !!signals.dsr,
+      };
+    });
+  };
+
+  Connection.prototype.setControlSignals = function(signals) {
+    var controlSignals = {};
+    if ('dtr' in signals) {
+      controlSignals.has_dtr = true;
+      controlSignals.dtr = signals.dtr;
+    }
+    if ('rts' in signals) {
+      controlSignals.has_rts = true;
+      controlSignals.rts = signals.rts;
+    }
+    return this.remoteConnection_.setControlSignals(controlSignals).then(
+        function(result) {
+      return !!result.success;
+    });
+  };
+
+  Connection.prototype.flush = function() {
+    return this.remoteConnection_.flush().then(function(result) {
+      return !!result.success;
+    });
+  };
+
+  Connection.prototype.setPaused = function(paused) {
+    this.paused_ = paused;
+  };
+
+  var connections_ = {};
+  var nextConnectionId_ = 0;
+
+  // Wrap all access to |connections_| through getConnections to avoid adding
+  // any synchronous dependencies on it. This will likely be important when
+  // supporting persistent connections by stashing them.
+  function getConnections() {
+    return Promise.resolve(connections_);
+  }
+
+  function getConnection(id) {
+    return getConnections().then(function(connections) {
+      if (!connections[id])
+        throw new Error ('Serial connection not found.');
+      return connections[id];
+    });
+  }
+
+  function allocateConnectionId() {
+    return Promise.resolve(nextConnectionId_++);
+  }
+
   return {
     getDevices: getDevices,
+    createConnection: Connection.create,
+    getConnection: getConnection,
+    getConnections: getConnections,
   };
 });