forked from metarhia/metacom
-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Showing
1 changed file
with
52 additions
and
7 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,41 +1,86 @@ | ||
'use strict'; | ||
|
||
const PROTOCOL_VERSION = 1; | ||
const HANDSHAKE_LENGTH = 36; | ||
const PARCEL_LENGTH = 16; | ||
const CHUNK_LENGTH = 12; | ||
|
||
const parcel = (buffer) => { | ||
const readParcel = (buffer) => { | ||
// Read parcel from buffer | ||
// Return parcel object | ||
const rest = Buffer.from(buffer, 1, PARCEL_LENGTH); | ||
return rest; | ||
}; | ||
|
||
const chunk = (buffer) => { | ||
const parcel = ( | ||
// Encode parcel structure to Buffer | ||
// id, // parcelId: 4b | ||
// type, // parcelType: 4b | ||
// compression, // 1b: no = 0, gzip = 1 | ||
// encoding, // 1b: binary = 0, jstp = 1, json = 2, bson = 3, v8 = 4 | ||
// length // 8b | ||
) => { | ||
const parcel = Buffer.alloc(PARCEL_LENGTH); | ||
parcel.writeInt8(0, 0); | ||
// Write parcel fields to buffer | ||
return parcel; | ||
}; | ||
|
||
const readChunk = (buffer) => { | ||
// Read chunkk from buffer | ||
// Return chunk object | ||
const rest = Buffer.from(buffer, 1, CHUNK_LENGTH); | ||
return rest; | ||
}; | ||
|
||
const handshake = (buffer) => { | ||
const chunk = ( | ||
// Encode chunk structure to Buffer | ||
// id, // parcelId: 4b | ||
// flags, // 1b: more = 1, stop = 2, pause = 4, resume = 8 | ||
// length, // 2b | ||
// payload // Buffer | ||
) => { | ||
const chunk = Buffer.alloc(CHUNK_LENGTH); | ||
chunk.writeInt8(1, 0); | ||
// Write chunk fields to buffer | ||
return chunk; | ||
}; | ||
|
||
const readHandshake = (buffer) => { | ||
// Read handshake from buffer | ||
// Return handshake object | ||
const rest = Buffer.from(buffer, 0, HANDSHAKE_LENGTH); | ||
return rest; | ||
}; | ||
|
||
const handshake = ( | ||
// Encode handshake structure to Buffer | ||
// status // 1b: 0 = new, 1 = restore | ||
// reserved // 1b | ||
// token // 32b (optional) | ||
) => { | ||
const handshake = Buffer.alloc(HANDSHAKE_LENGTH); | ||
handshake.writeInt16LE(PROTOCOL_VERSION, 0); | ||
// Write handshake to buffer | ||
return handshake; | ||
}; | ||
|
||
const structTypes = [ | ||
/* 0 */ parcel, | ||
/* 1 */ chunk | ||
/* 0 */ readParcel, | ||
/* 1 */ readChunk | ||
]; | ||
|
||
const structure = (buffer) => { | ||
const readStruct = (buffer) => { | ||
// Read structure from buffer | ||
// Return parcel or chunk object | ||
const structType = buffer.readInt8(0, true); | ||
const parser = structTypes[structType]; | ||
if (parser) return parser(buffer); | ||
}; | ||
|
||
module.exports = { structure, handshake, chunk, parcel }; | ||
module.exports = { | ||
handshake, readHandshake, | ||
chunk, readChunk, | ||
parcel, readParcel, | ||
readStruct | ||
}; |