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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 define("mojo/public/bindings/js/connector", [ | |
| 6 "mojo/public/bindings/js/codec", | |
| 7 "mojo/bindings/js/core", | |
| 8 "mojo/bindings/js/support", | |
| 9 ], function(codec, core, support) { | |
| 10 | |
| 11 function Connector(handle) { | |
| 12 this.handle_ = handle; | |
| 13 this.dropWrites_ = false; | |
| 14 this.error_ = false; | |
| 15 this.incomingReceiver_ = null; | |
| 16 this.readWaitCookie_ = null; | |
| 17 | |
| 18 this.waitToReadMore_(); | |
| 19 } | |
| 20 | |
| 21 Connector.prototype.close = function() { | |
| 22 if (this.readWaitCookie_) { | |
| 23 support.cancelWait(this.readWaitCookie_); | |
| 24 this.readWaitCookie_ = null; | |
| 25 } | |
| 26 if (this.handle_ != core.kInvalidHandle) { | |
| 27 core.close(this.handle_); | |
| 28 this.handle_ = core.kInvalidHandle; | |
| 29 } | |
| 30 }; | |
| 31 | |
| 32 Connector.prototype.accept = function(message) { | |
| 33 if (this.error_) | |
| 34 return false; | |
| 35 | |
| 36 if (this.dropWrites_) | |
| 37 return true; | |
| 38 | |
| 39 var result = core.writeMessage(this.handle_, | |
| 40 message.memory, | |
| 41 message.handles, | |
| 42 core.WRITE_MESSAGE_FLAG_NONE); | |
| 43 | |
| 44 switch (result) { | |
| 45 case core.RESULT_OK: | |
| 46 // The handles were successfully transferred, so we don't own them | |
| 47 // anymore. | |
| 48 message.handles = []; | |
| 49 break; | |
| 50 case core.RESULT_FAILED_PRECONDITION: | |
| 51 // There's no point in continuing to write to this pipe since the other | |
| 52 // end is gone. Avoid writing any future messages. Hide write failures | |
| 53 // from the caller since we'd like them to continue consuming any | |
| 54 // backlog of incoming messages before regarding the message pipe as | |
| 55 // closed. | |
| 56 this.dropWrites_ = true; | |
| 57 break; | |
| 58 default: | |
| 59 // This particular write was rejected, presumably because of bad input. | |
| 60 // The pipe is not necessarily in a bad state. | |
| 61 return false; | |
| 62 } | |
| 63 return true; | |
| 64 }; | |
| 65 | |
| 66 Connector.prototype.setIncomingReceiver = function(receiver) { | |
| 67 this.incomingReceiver_ = receiver; | |
| 68 }; | |
| 69 | |
| 70 Connector.prototype.encounteredError = function() { | |
| 71 return this.error_; | |
| 72 } | |
| 73 | |
| 74 Connector.prototype.waitToReadMore_ = function() { | |
| 75 this.readWaitCookie_ = support.asyncWait(this.handle_, | |
| 76 core.WAIT_FLAG_READABLE, | |
| 77 this.readMore_.bind(this)); | |
| 78 }; | |
| 79 | |
| 80 Connector.prototype.readMore_ = function(result) { | |
| 81 for (;;) { | |
| 82 var read = core.readMessage(this.handle_, | |
| 83 core.READ_MESSAGE_FLAG_NONE); | |
| 84 if (read.result == core.RESULT_SHOULD_WAIT) { | |
| 85 this.waitToReadMore_(); | |
| 86 return; | |
| 87 } | |
| 88 if (read.result != core.RESULT_OK) { | |
| 89 this.error_ = true; | |
| 90 return; | |
| 91 } | |
| 92 // TODO(abarth): Should core.readMessage return a Uint8Array? | |
| 93 var memory = new Uint8Array(read.buffer); | |
| 94 var message = new codec.Message(memory, read.handles); | |
| 95 if (this.incomingReceiver_) | |
| 96 this.incomingReceiver_.accept(message); | |
| 97 } | |
| 98 }; | |
| 99 | |
| 100 var exports = {}; | |
| 101 exports.Connector = Connector; | |
| 102 return exports; | |
| 103 }); | |
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