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observe-009-replacement-on-success.js
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observe-009-replacement-on-success.js
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/*
Handle a replacement of an Observe request after a successful Observe response
to another request:
1. Client sends a request:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 0 0 | 0 0 0 0 | 0 0 0 0 0 0 0 1 | 0x0001
1 | CON | 0 bytes | GET | 1
------------------------------------------------------------------------------
Remote Endpoint: 127.0.0.1
------------------------------------------------------------------------------
Observe : 0
Uri-Path: observer
==============================================================================
2. Server sends a piggy-backed response:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 1 0 | 0 0 0 0 | 0 1 0 0 0 1 0 1 | 0x0001
1 | ACK | 0 bytes | 2.05 Content | 1
------------------------------------------------------------------------------
Remote Endpoint: 127.0.0.1
------------------------------------------------------------------------------
Observe : 1
Content-Format: text/plain;charset=utf-8
Max-Age : 10
------------------------------------------------------------------------------
Payload (1 byte)
1
==============================================================================
3. Client receives the #2 response. Request emits the `acknowledged` event
and the `response` event.
4. After 2s, server sends the first notification:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 0 0 | 0 0 0 0 | 0 1 0 0 0 1 0 1 | 0x4321
1 | CON | 0 bytes | 2.05 Content | 17185
------------------------------------------------------------------------------
Remote Endpoint: 127.0.0.1
------------------------------------------------------------------------------
Observe : 2
Content-Format: text/plain;charset=utf-8
Max-Age : 10
------------------------------------------------------------------------------
Payload (1 byte)
2
==============================================================================
5. Client receives the #4 notification. Request emits the `response` event.
6. Client acknowledges the #4 notification:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 1 0 | 0 0 0 0 | 0 0 0 0 0 0 0 0 | 0x4321
1 | ACK | 0 bytes | Empty | 17185
------------------------------------------------------------------------------
Remote Endpoint: 127.0.0.1
==============================================================================
7. Client sends another request for the same resource with an Observe option:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 0 0 | 0 0 0 1 | 0 0 0 0 0 0 0 1 | 0x0002
1 | CON | 1 byte | GET | 2
------------------------------------------------------------------------------
Token | Remote Endpoint
01 | 127.0.0.1
------------------------------------------------------------------------------
Observe : 0
Uri-Path: observer
==============================================================================
8. Server receives the #7 request, replaces the #1 observer with the #6 one
and sends a response:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 1 0 | 0 0 0 1 | 0 1 0 0 0 1 0 1 | 0x0002
1 | ACK | 1 byte | 2.05 Content | 2
------------------------------------------------------------------------------
Token | Remote Endpoint
01 | 127.0.0.1
------------------------------------------------------------------------------
Observe : 3
Content-Format: text/plain;charset=utf-8
Max-Age : 10
------------------------------------------------------------------------------
Payload (1 byte)
3
==============================================================================
9. Client receives the #8 response. The #1 observer emits the `cancelled`
event. The #7 observer emits the `acknowledged` event and the `response` event.
10. Server sends the first notification for the #7 observer:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 0 0 | 0 0 0 1 | 0 1 0 0 0 1 0 1 | 0x4322
1 | CON | 1 byte | 2.05 Content | 17186
------------------------------------------------------------------------------
Token | Remote Endpoint
01 | 127.0.0.1
------------------------------------------------------------------------------
Observe : 4
Content-Format: text/plain;charset=utf-8
Max-Age : 10
------------------------------------------------------------------------------
Payload (1 byte)
4
==============================================================================
11. Client receives the #10 notification. Request emits the `response` event.
12. Client acknowledges the #10 notification:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 1 0 | 0 0 0 0 | 0 0 0 0 0 0 0 0 | 0x4322
1 | ACK | 0 bytes | Empty | 17186
------------------------------------------------------------------------------
Remote Endpoint: 127.0.0.1
==============================================================================
13. Client cancels the #7 observer. The #7 observer emits the `cancelled`
event.
14. Servers sends the second notification for the #7 observer:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 0 0 | 0 0 0 1 | 0 1 0 0 0 1 0 1 | 0x4323
1 | CON | 1 byte | 2.05 Content | 17187
------------------------------------------------------------------------------
Token | Remote Endpoint
01 | 127.0.0.1
------------------------------------------------------------------------------
Observe : 5
Content-Format: text/plain;charset=utf-8
Max-Age : 10
------------------------------------------------------------------------------
Payload (1 byte)
5
==============================================================================
15. Client receives the #14 notification, but resets it:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 1 1 | 0 0 0 0 | 0 0 0 0 0 0 0 0 | 0x4323
1 | RST | 0 bytes | Empty | 17187
------------------------------------------------------------------------------
Remote Endpoint: 127.0.0.1
==============================================================================
16. Server receives the #15 reset and removes the #7 observer.
*/
'use strict';
require('should');
var sinon = require('sinon');
var helpers = require('../helpers');
var Message = require(helpers.LIB_DIR).Message;
helpers.test(__filename, function(ctx)
{
/*jshint maxstatements:999*/
var subscriptionRequest1 = {
type: Message.Type.CON,
code: Message.Code.GET,
id: 0x0001,
token: new Buffer([]),
uri: '/observer',
observe: 0
};
var subscriptionResponse1 = {
type: Message.Type.ACK,
code: Message.Code.CONTENT,
id: subscriptionRequest1.id,
token: subscriptionRequest1.token,
contentFormat: 'text/plain;charset=utf-8',
maxAge: 10,
observe: 1,
payload: new Buffer('1')
};
var notification1 = {
type: Message.Type.CON,
code: Message.Code.CONTENT,
id: 0x4321,
token: subscriptionRequest1.token,
contentFormat: 'text/plain;charset=utf-8',
maxAge: 10,
observe: 2,
payload: new Buffer('2')
};
var notificationAck1 = {
type: Message.Type.ACK,
code: Message.Code.EMPTY,
id: notification1.id
};
var subscriptionRequest2 = {
type: Message.Type.CON,
code: Message.Code.GET,
id: 0x0002,
token: new Buffer([0x01]),
uri: subscriptionRequest1.uri,
observe: 0
};
var subscriptionResponse2 = {
type: Message.Type.ACK,
code: Message.Code.CONTENT,
id: subscriptionRequest2.id,
token: subscriptionRequest2.token,
contentFormat: 'text/plain;charset=utf-8',
maxAge: 10,
observe: 3,
payload: new Buffer('3')
};
var notification2 = {
type: Message.Type.CON,
code: Message.Code.CONTENT,
id: 0x4322,
token: subscriptionRequest2.token,
contentFormat: 'text/plain;charset=utf-8',
maxAge: 10,
observe: 4,
payload: new Buffer('4')
};
var notificationAck2 = {
type: Message.Type.ACK,
code: Message.Code.EMPTY,
id: notification2.id
};
var notification3 = {
type: Message.Type.CON,
code: Message.Code.CONTENT,
id: 0x4323,
token: subscriptionRequest2.token,
contentFormat: 'text/plain;charset=utf-8',
maxAge: 10,
observe: 5,
payload: new Buffer('5')
};
var notificationRst3 = {
type: Message.Type.RST,
code: Message.Code.EMPTY,
id: notification3.id
};
ctx.socket.expectRequest(subscriptionRequest1);
ctx.socket.scheduleResponse(50, subscriptionResponse1);
ctx.socket.scheduleResponse(2050, notification1);
ctx.socket.expectRequest(2050, notificationAck1);
ctx.socket.expectRequest(3000, subscriptionRequest2);
ctx.socket.scheduleResponse(3050, subscriptionResponse2);
ctx.socket.scheduleResponse(4050, notification2);
ctx.socket.expectRequest(4050, notificationAck2);
ctx.socket.scheduleResponse(6050, notification3);
ctx.socket.expectRequest(6050, notificationRst3);
var subscriptionReq1 = Message.fromObject(subscriptionRequest1);
var subscriptionReq2 = Message.fromObject(subscriptionRequest2);
var subscription1EventSpy = sinon.spy(subscriptionReq1, 'emit');
var subscription2EventSpy = sinon.spy(subscriptionReq2, 'emit');
ctx.client.request(subscriptionReq1);
setTimeout(function() { ctx.client.request(subscriptionReq2); }, 3000);
setTimeout(function() { ctx.client.cancel(subscriptionReq2); }, 5000);
ctx.clock.tick(3600000);
return function assert()
{
ctx.socket.assert();
sinon.assert.callCount(subscription1EventSpy, 4);
sinon.assert.callCount(subscription2EventSpy, 4);
sinon.assert.calledWith(
subscription1EventSpy, 'acknowledged', sinon.match.instanceOf(Message)
);
sinon.assert.calledWith(
subscription1EventSpy, 'response', sinon.match.instanceOf(Message)
);
sinon.assert.calledWith(subscription1EventSpy, 'cancelled');
sinon.assert.calledWith(
subscription2EventSpy, 'acknowledged', sinon.match.instanceOf(Message)
);
sinon.assert.calledWith(
subscription2EventSpy, 'response', sinon.match.instanceOf(Message)
);
sinon.assert.calledWith(subscription2EventSpy, 'cancelled');
subscription1EventSpy.args[0][0].should.be.equal('acknowledged');
sinon.assert.coapMessage(
subscription1EventSpy.args[0][1],
subscriptionResponse1,
"Invalid observer #1 ACK."
);
subscription1EventSpy.args[1][0].should.be.equal('response');
sinon.assert.coapMessage(
subscription1EventSpy.args[1][1],
subscriptionResponse1,
"Invalid `response` #1."
);
subscription1EventSpy.args[2][0].should.be.equal('response');
sinon.assert.coapMessage(
subscription1EventSpy.args[2][1],
notification1,
"Invalid `response` #2."
);
subscription1EventSpy.args[3][0].should.be.equal('cancelled');
subscription2EventSpy.args[0][0].should.be.equal('acknowledged');
sinon.assert.coapMessage(
subscription2EventSpy.args[0][1],
subscriptionResponse2,
"Invalid observer #2 ACK."
);
subscription2EventSpy.args[1][0].should.be.equal('response');
sinon.assert.coapMessage(
subscription2EventSpy.args[1][1],
subscriptionResponse2,
"Invalid `response` #3."
);
subscription2EventSpy.args[2][0].should.be.equal('response');
sinon.assert.coapMessage(
subscription2EventSpy.args[2][1],
notification2,
"Invalid `response` #2."
);
subscription2EventSpy.args[3][0].should.be.equal('cancelled');
};
});