[Communication protocol proposal. Not yet fully implemented and still expected to change.]

Nodes communicate by exchanging messages through network sockets. Basic message format is simple:

		json-length: ABC

		bin-length: DEF

		{... JSON payload ...}

		... binary payload ...

`ABC` is the JSON payload length (decimal integer), `DEF` is the binary payload length. JSON payload always contains a "command" field.

### <a name="req"></a>req ###

Requests hashes or a data chunk from the server.

#### Params ####

- {hash, data} dataType

hash

- [(int) i0, ...] index: list of requested node keys from the HashTree

data

#### Responses ####

- [send](#send)

- [err](#err)

### <a name="send"></a>send ####

Sends data. Can be a client action or a response to a request.

#### Params ####

- {hash, data} dataType

- index: see [req](#req)

# generate certificate

# openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365 -nodes -subj "/CN=name"

set -e

DIRNAME=`dirname $0`

sudo losetup -f ~/ext2.img

sudo cryptsetup open --type=luks /dev/loop0 ext2luks

sudo mount /dev/mapper/ext2luks ~/temp

sudo rdiff-backup -v 5 ~/Dokumenty ~/temp/Dokumenty

sudo rdiff-backup -v 5 ~/Obrázky ~/temp/Obrázky

sudo umount /dev/mapper/ext2luks

sudo cryptsetup close ext2luks

sudo losetup -d /dev/loop0

echo

python $DIRNAME/morevna.py build ~/ext2.bin ~/ext2.img

python $DIRNAME/morevna.py push --tree ~/ext2.bin ~/ext2.img

class NetworkWriter:

	def __init__(self,stream):

		self._stream=stream

	def writeMsg(self,*args):

		msg=self.prepMsg(*args)

		self._stream.write(msg)

		self._stream.flush()

		stats.logSent(msg)

	def prepMsg(self,jsonData,binData=b""):

		jsonLength=bytes("json-length: "+str(len(jsonData))+"\n",encoding="utf-8")

		binLength=bytes("bin-length: "+str(len(binData))+"\n",encoding="utf-8")

		return b"".join((jsonLength,binLength,jsonData,binData))