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block-017-put-retransmit.js
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/*
Handle retransmission of a confirmable, blockwise PUT request:
1. User sends a request with the `blockSize` option set to `128`:
==============================================================================
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 | PUT | 1
------------------------------------------------------------------------------
Remote Endpoint: 127.0.0.1
------------------------------------------------------------------------------
Uri-Path : blocks
Uri-Path : put
Content-Format: text/plain;charset=utf-8
------------------------------------------------------------------------------
Payload (128 bytes)
|-------------------------------------------------------------|
| BLOCK 1 |
|-------------------------------------------------------------|
| BLOCK 2 |
|-------------------------------------------------------------|
==============================================================================
2. Client recognizes that the payload of the #1 request is bigger than
the specified block size, so it constructs and sends the first Block1 request
instead:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 0 0 | 0 0 0 0 | 0 0 0 0 0 0 0 1 | 0x0002
1 | CON | 0 bytes | PUT | 2
------------------------------------------------------------------------------
Remote Endpoint: 127.0.0.1
------------------------------------------------------------------------------
Uri-Path : blocks
Uri-Path : put
Content-Format: text/plain;charset=utf-8
Block1 : NUM: 0, M: true, SZX: 3 (128 bytes)
------------------------------------------------------------------------------
Payload (128 bytes)
|-------------------------------------------------------------|
| BLOCK 1 |
==============================================================================
3. Server confirms the first block:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 1 0 | 0 0 0 0 | 0 1 0 0 0 1 0 0 | 0x0002
1 | ACK | 0 bytes | 2.04 Changed | 2
------------------------------------------------------------------------------
Remote Endpoint: 127.0.0.1
------------------------------------------------------------------------------
Block1: NUM: 0, M: true, SZX: 3 (128 bytes)
==============================================================================
4. Client receives the #3 confirmation. Request emits the `acknowledged` event
and the `block sent` event.
5. Client sends a request with the second block:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 0 0 | 0 0 0 0 | 0 0 0 0 0 0 0 1 | 0x0003
1 | CON | 0 bytes | PUT | 3
------------------------------------------------------------------------------
Remote Endpoint: 127.0.0.1
------------------------------------------------------------------------------
Uri-Path : blocks
Uri-Path : put
Content-Format: text/plain;charset=utf-8
Block1 : NUM: 1, M: true, SZX: 3 (128 bytes)
------------------------------------------------------------------------------
Payload (128 bytes)
|-------------------------------------------------------------|
| BLOCK 2 |
==============================================================================
6. The #5 request is lost along the way...
7. Client retransmits the #5 request...
8. Servers receives the #5 request and confirms the second block:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 1 0 | 0 0 0 0 | 0 1 0 0 0 1 0 0 | 0x0003
1 | ACK | 0 bytes | 2.04 Changed | 3
------------------------------------------------------------------------------
Remote Endpoint: 127.0.0.1
------------------------------------------------------------------------------
Block1: NUM: 1, M: true, SZX: 3 (128 bytes)
==============================================================================
9. Client receives the #8 confirmation. The #1 request emits the `block sent`
event.
10. Client sends a request with the third, last block:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 0 0 | 0 0 0 0 | 0 0 0 0 0 0 0 1 | 0x0004
1 | CON | 0 bytes | PUT | 4
------------------------------------------------------------------------------
Remote Endpoint: 127.0.0.1
------------------------------------------------------------------------------
Uri-Path : blocks
Uri-Path : put
Content-Format: text/plain;charset=utf-8
Block1 : NUM: 2, M: false, SZX: 3 (128 bytes)
------------------------------------------------------------------------------
Payload (63 bytes)
|-------------------------------------------------------------|
==============================================================================
11. Server confirms the last block:
==============================================================================
Version | Type | Token Length | Code | Message ID
0 1 | 1 0 | 0 0 0 0 | 0 1 0 0 0 1 0 0 | 0x0004
1 | ACK | 0 bytes | 2.04 Changed | 4
------------------------------------------------------------------------------
Remote Endpoint: 127.0.0.1
------------------------------------------------------------------------------
Block1: NUM: 2, M: false, SZX: 3 (128 bytes)
==============================================================================
12. Client receives the #11 confirmation. The #1 request emits the `block sent`
event and the `response` event.
*/
'use strict';
require('should');
var sinon = require('sinon');
var helpers = require('../helpers');
var Message = require(helpers.LIB_DIR).Message;
helpers.test(__filename, function(ctx)
{
var request = {
type: Message.Type.CON,
code: Message.Code.PUT,
uri: '/blocks/put',
contentFormat: 'text/plain;charset=utf-8',
payload: new Buffer(
'|-------------------------------------------------------------|\n' +
'| BLOCK 1 |\n' +
'|-------------------------------------------------------------|\n' +
'| BLOCK 2 |\n' +
'|-------------------------------------------------------------|'
)
};
var reqWithBlock0 = {
type: request.type,
code: request.code,
id: 0x0002,
uri: request.uri,
block1: {num: 0, m: true, szx: 3},
contentFormat: request.contentFormat,
payload: request.payload.slice(0 * 128, 1 * 128)
};
var resToBlock0 = {
type: Message.Type.ACK,
code: Message.Code.CHANGED,
id: reqWithBlock0.id,
block1: {num: 0, m: true, szx: 3}
};
var reqWithBlock1 = {
type: request.type,
code: request.code,
id: 0x0003,
uri: request.uri,
block1: {num: 1, m: true, szx: 3},
contentFormat: request.contentFormat,
payload: request.payload.slice(1 * 128, 2 * 128)
};
var resToBlock1 = {
type: Message.Type.ACK,
code: Message.Code.CHANGED,
id: reqWithBlock1.id,
block1: {num: 1, m: true, szx: 3}
};
var reqWithBlock2 = {
type: request.type,
code: request.code,
id: 0x0004,
uri: request.uri,
block1: {num: 2, m: false, szx: 3},
contentFormat: request.contentFormat,
payload: request.payload.slice(2 * 128, 3 * 128)
};
var resToBlock2 = {
type: Message.Type.ACK,
code: Message.Code.CHANGED,
id: reqWithBlock2.id,
block1: {num: 2, m: false, szx: 3}
};
ctx.socket.expectRequest(reqWithBlock0);
ctx.socket.scheduleResponse(50, resToBlock0);
ctx.socket.expectRequest(50, reqWithBlock1);
ctx.socket.expectRequest(2050, reqWithBlock1);
ctx.socket.scheduleResponse(2100, resToBlock1);
ctx.socket.expectRequest(2100, reqWithBlock2);
ctx.socket.scheduleResponse(2150, resToBlock2);
var req = ctx.client.request(Message.fromObject(request), {
blockSize: 128
});
var eventSpy = sinon.spy(req, 'emit');
ctx.clock.tick(3600000);
return function assert()
{
ctx.socket.assert();
sinon.assert.callCount(eventSpy, 5);
sinon.assert.calledWith(
eventSpy, 'acknowledged', sinon.match.instanceOf(Message)
);
sinon.assert.calledWith(
eventSpy, 'block sent', sinon.match.instanceOf(Message)
);
sinon.assert.calledWith(
eventSpy, 'response', sinon.match.instanceOf(Message)
);
eventSpy.args[0][0].should.be.equal('acknowledged');
sinon.assert.coapMessage(
eventSpy.args[0][1], resToBlock0, "Invalid ACK."
);
eventSpy.args[1][0].should.be.equal('block sent');
sinon.assert.coapMessage(
eventSpy.args[1][1], resToBlock0, "Invalid `block sent` (#1)."
);
eventSpy.args[2][0].should.be.equal('block sent');
sinon.assert.coapMessage(
eventSpy.args[2][1], resToBlock1, "Invalid `block sent` (#2)."
);
eventSpy.args[3][0].should.be.equal('block sent');
sinon.assert.coapMessage(
eventSpy.args[3][1], resToBlock2, "Invalid `block sent` (#3)."
);
eventSpy.args[4][0].should.be.equal('response');
sinon.assert.coapMessage(
eventSpy.args[4][1], resToBlock2, "Invalid `response`."
);
};
});