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observe-016-blockwise-out-of-order-notification.js
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/*
Handle an out-of-order blockwise notification soon followed by another valid
notification:
1. Client sends a request:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 0 0 | 0 0 1 0 | 0 0 0 0 0 0 0 1 | 0x0001
1 | CON | 2 bytes | GET | 1
------------------------------------------------------------------------------
Remote Endpoint: 127.0.0.1
------------------------------------------------------------------------------
Observe : 0
Uri-Path: observer
Uri-Path: blocks
Uri-Path: out-of-order
==============================================================================
2. Server sends a piggy-backed response with a Block2 option:
==============================================================================
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
Block2 : NUM: 0, M: true, SZX: 0 (16 bytes)
------------------------------------------------------------------------------
Payload (16 bytes)
1111111111111111
==============================================================================
3. Client receives the #2 response. Request emits the `acknowledged` event and
the `block received` event.
4. Server sends the second block:
==============================================================================
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 : 1
Content-Format: text/plain;charset=utf-8
Max-Age : 10
Block2 : NUM: 1, M: false, SZX: 0 (16 bytes)
------------------------------------------------------------------------------
Payload (16 bytes)
2222222222222222
==============================================================================
5. Client receives the #4 block and sends the acknowledgement:
==============================================================================
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
==============================================================================
6. The #1 request emits the `block received` event and the `response` event.
7. After 2s, server sends the second block (instead of the first) of 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 | 0x4322
1 | CON | 0 bytes | 2.05 Content | 17186
------------------------------------------------------------------------------
Remote Endpoint: 127.0.0.1
------------------------------------------------------------------------------
Observe : 2
Content-Format: text/plain;charset=utf-8
Max-Age : 10
Block2 : NUM: 1, M: true, SZX: 0 (16 bytes)
------------------------------------------------------------------------------
Payload (16 bytes)
4444444444444444
==============================================================================
8. Client receives the #7 message and ignores it, because it doesn't start
at block number 0 (acknowledgement is still sent, because it's a 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
==============================================================================
10. Server receives the #8 acknowledgement and sends the third block:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 0 0 | 0 0 0 0 | 0 1 0 0 0 1 0 1 | 0x4324
1 | CON | 0 bytes | 2.05 Content | 17188
------------------------------------------------------------------------------
Remote Endpoint: 127.0.0.1
------------------------------------------------------------------------------
Observe : 2
Content-Format: text/plain;charset=utf-8
Max-Age : 10
Block2 : NUM: 2, M: false, SZX: 0 (16 bytes)
------------------------------------------------------------------------------
Payload (16 bytes)
5555555555555555
==============================================================================
11. Client receives the #10 message and ignores it, because it doesn't start
at block number 0 (acknowledgement is still sent, because it's a notification):
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 1 0 | 0 0 0 0 | 0 0 0 0 0 0 0 0 | 0x4324
1 | ACK | 0 bytes | Empty | 17188
------------------------------------------------------------------------------
Remote Endpoint: 127.0.0.1
==============================================================================
14. After 2s, server sends the first block of the second notification:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 0 0 | 0 0 0 0 | 0 1 0 0 0 1 0 1 | 0x4325
1 | CON | 0 bytes | 2.05 Content | 17189
------------------------------------------------------------------------------
Remote Endpoint: 127.0.0.1
------------------------------------------------------------------------------
Observe : 3
Content-Format: text/plain;charset=utf-8
Max-Age : 10
Block2 : NUM: 0, M: true, SZX: 0 (16 bytes)
------------------------------------------------------------------------------
Payload (16 bytes)
6666666666666666
==============================================================================
15. Client receives the #14 message and acknowledges it:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 1 0 | 0 0 0 0 | 0 0 0 0 0 0 0 0 | 0x4325
1 | ACK | 0 bytes | Empty | 17189
------------------------------------------------------------------------------
Remote Endpoint: 127.0.0.1
==============================================================================
16. The #1 request emits the `block received` event
(all blocks of the previous, unfinished notifications are dropped).
17. Server receives the #15 acknowledgement and sends the second block:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 0 0 | 0 0 0 0 | 0 1 0 0 0 1 0 1 | 0x4326
1 | CON | 0 bytes | 2.05 Content | 17190
------------------------------------------------------------------------------
Remote Endpoint: 127.0.0.1
------------------------------------------------------------------------------
Observe : 3
Content-Format: text/plain;charset=utf-8
Max-Age : 10
Block2 : NUM: 1, M: false, SZX: 0 (16 bytes)
------------------------------------------------------------------------------
Payload (16 bytes)
7777777777777777
==============================================================================
18. Client receives the #17 message and acknowledges it:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 1 0 | 0 0 0 0 | 0 0 0 0 0 0 0 0 | 0x4326
1 | ACK | 0 bytes | Empty | 17190
------------------------------------------------------------------------------
Remote Endpoint: 127.0.0.1
==============================================================================
19. The #1 request emits the `block received` event and the `response` event.
20. Client cancels the #1 observer. The #1 request emits the `cancelled` event.
21. Server crashes. No more notifications are sent.
*/
'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 request = {
type: Message.Type.CON,
code: Message.Code.GET,
id: 0x0001,
token: new Buffer([]),
uri: '/observer/blocks/out-of-order',
observe: 0
};
var responseBlock0 = {
type: Message.Type.ACK,
code: Message.Code.CONTENT,
id: request.id,
token: request.token,
contentFormat: 'text/plain;charset=utf-8',
maxAge: 10,
observe: 1,
block2: {num: 0, m: true, szx: 0},
payload: new Buffer('1111111111111111')
};
var responseBlock1 = {
type: Message.Type.CON,
code: Message.Code.CONTENT,
id: 0x4321,
token: request.token,
contentFormat: 'text/plain;charset=utf-8',
maxAge: 10,
observe: 1,
block2: {num: 1, m: false, szx: 0},
payload: new Buffer('2222222222222222')
};
var responseBlock1Ack = {
type: Message.Type.ACK,
code: Message.Code.EMPTY,
id: responseBlock1.id
};
var response = {
type: responseBlock1.type,
code: responseBlock1.code,
id: responseBlock1.id,
token: responseBlock1.token,
contentFormat: responseBlock1.contentFormat,
maxAge: responseBlock1.maxAge,
observe: responseBlock1.observe,
block2: responseBlock1.block2,
payload: Buffer.concat([responseBlock0.payload, responseBlock1.payload])
};
var notification1Block1 = {
type: Message.Type.CON,
code: Message.Code.CONTENT,
id: 0x4322,
token: request.token,
contentFormat: 'text/plain;charset=utf-8',
maxAge: 10,
observe: 2,
block2: {num: 1, m: true, szx: 0},
payload: new Buffer('4444444444444444')
};
var notification1Block1Ack = {
type: Message.Type.ACK,
code: Message.Type.EMPTY,
id: notification1Block1.id
};
var notification1Block2 = {
type: Message.Type.CON,
code: Message.Code.CONTENT,
id: 0x4323,
token: request.token,
contentFormat: 'text/plain;charset=utf-8',
maxAge: 10,
observe: 2,
block2: {num: 2, m: false, szx: 0},
payload: new Buffer('5555555555555555')
};
var notification1Block2Ack = {
type: Message.Type.ACK,
code: Message.Type.EMPTY,
id: notification1Block2.id
};
var notification2Block0 = {
type: Message.Type.CON,
code: Message.Code.CONTENT,
id: 0x4324,
token: request.token,
contentFormat: 'text/plain;charset=utf-8',
maxAge: 10,
observe: 3,
block2: {num: 0, m: true, szx: 0},
payload: new Buffer('6666666666666666')
};
var notification2Block0Ack = {
type: Message.Type.ACK,
code: Message.Type.EMPTY,
id: notification2Block0.id
};
var notification2Block1 = {
type: Message.Type.CON,
code: Message.Code.CONTENT,
id: 0x4325,
token: request.token,
contentFormat: 'text/plain;charset=utf-8',
maxAge: 10,
observe: 3,
block2: {num: 1, m: false, szx: 0},
payload: new Buffer('7777777777777777')
};
var notification2Block1Ack = {
type: Message.Type.ACK,
code: Message.Type.EMPTY,
id: notification2Block1.id
};
var notification2Response = {
type: notification2Block1.type,
code: notification2Block1.code,
id: notification2Block1.id,
token: notification2Block1.token,
contentFormat: notification2Block1.contentFormat,
maxAge: notification2Block1.maxAge,
observe: notification2Block1.observe,
block2: notification2Block1.block2,
payload: Buffer.concat([
notification2Block0.payload,
notification2Block1.payload
])
};
ctx.socket.expectRequest(request);
ctx.socket.scheduleResponse(50, responseBlock0);
ctx.socket.scheduleResponse(75, responseBlock1);
ctx.socket.expectRequest(75, responseBlock1Ack);
ctx.socket.scheduleResponse(2050, notification1Block1);
ctx.socket.expectRequest(2050, notification1Block1Ack);
ctx.socket.scheduleResponse(2075, notification1Block2);
ctx.socket.expectRequest(2075, notification1Block2Ack);
ctx.socket.scheduleResponse(4050, notification2Block0);
ctx.socket.expectRequest(4050, notification2Block0Ack);
ctx.socket.scheduleResponse(4075, notification2Block1);
ctx.socket.expectRequest(4075, notification2Block1Ack);
var req = ctx.client.request(Message.fromObject(request));
setTimeout(function() { ctx.client.cancel(req); }, 5000);
var eventSpy = sinon.spy(req, 'emit');
ctx.clock.tick(3600000);
return function assert()
{
ctx.socket.assert();
sinon.assert.callCount(eventSpy, 8);
sinon.assert.calledWith(
eventSpy, 'acknowledged', sinon.match.instanceOf(Message)
);
sinon.assert.calledWith(
eventSpy, 'block received', sinon.match.instanceOf(Message)
);
sinon.assert.calledWith(
eventSpy, 'response', sinon.match.instanceOf(Message)
);
sinon.assert.calledWith(
eventSpy, 'cancelled'
);
eventSpy.args[0][0].should.be.equal('acknowledged');
sinon.assert.coapMessage(
eventSpy.args[0][1], responseBlock0, "Invalid ACK."
);
eventSpy.args[1][0].should.be.equal('block received');
sinon.assert.coapMessage(
eventSpy.args[1][1], responseBlock0, "Invalid `block received` #1."
);
eventSpy.args[2][0].should.be.equal('block received');
sinon.assert.coapMessage(
eventSpy.args[2][1], responseBlock1, "Invalid `block received` #2."
);
eventSpy.args[3][0].should.be.equal('response');
sinon.assert.coapMessage(
eventSpy.args[3][1], response, "Invalid `response` #1."
);
eventSpy.args[4][0].should.be.equal('block received');
sinon.assert.coapMessage(
eventSpy.args[4][1], notification2Block0, "Invalid `block received` #3."
);
eventSpy.args[5][0].should.be.equal('block received');
sinon.assert.coapMessage(
eventSpy.args[5][1], notification2Block1, "Invalid `block received` #4."
);
eventSpy.args[6][0].should.be.equal('response');
sinon.assert.coapMessage(
eventSpy.args[6][1], notification2Response, "Invalid `response` #2."
);
eventSpy.args[7][0].should.be.equal('cancelled');
};
});