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The Python implementation of the libp2p networking stack 🐍 [under development]
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stuckinaboot and robzajac [WIP] PubSub and FloodSub development (#133)
* Add notifee interface

* Add notify function to network interface

* Implement notify feature

* Add tests for notify

* Make notifee functions all async

* Fix linting issue

* Fix linting issue

* Scaffold pubsub router interface

* Scaffold pubsub directory

* Store peer_id in muxed connection

* Implement pubsub notifee

* Remove outdated files

* Implement pubsub first attempt

* Prepare pubsub for floodsub

* Add mplex conn to net stream and add conn in notify tests

* Implement floodsub

* Use NetStream in generic protocol handler

* Debugging async issues

* Modify test to perform proper assert. Test passes

* Remove callbacks. Reduce sleep time

* Add simple three node test

* Clean up code. Add message classes

* Add test for two topics

* Add conn to net stream and conn tests

* Refactor test setup to remove duplicate code

* Fix linting issues

* Fix linting issue

* Fix linting issue

* Fix outstanding unrelated lint issue in multiselect_client

* Add connect function

* Remove debug prints

* Remove debug prints from floodsub

* Use MessageTalk in place of direct message breakdown

* Remove extra prints

* Remove outdated function

* Add message to queues for all topics in message

* Debugging

* Add message self delivery

* Increase read timeout to 5 to get pubsub tests passing

* Refactor testing helper func. Add tests

* Add tests and increase timeout to get tests passing

* Add dummy account demo scaffolding

* Attempt to use threads. Test fails

* Implement basic dummy node tests using threads

* Add generic testing function

* Add simple seven node tree test

* Add more complex seven node tree tests

* Add five node ring tests

* Remove unnecessary get_message_type func

* Add documentation to classes

* Add message id to messages

* Add documentation to test helper func

* Add docs to dummy account node helper func

* Add more docs to dummy account node test helper func

* fixed linting errors in floodsub

* small notify bugfix

* move pubsub into libp2p

* fixed pubsub linting

* fixing pubsub test failures

* linting
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README.md

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WARNING

py-libp2p is an experimental and work-in-progress repo under heavy development. We do not yet recommend using py-libp2p in production environments.

Sponsorship

This project is graciously sponsored by the Ethereum Foundation through Wave 5 of their Grants Program.

Maintainers

The py-libp2p team consists of:

@zixuanzh @alexh @stuckinaboot @robzajac

Development

py-libp2p requires Python 3.7 and the best way to guarantee a clean Python 3.7 environment is with virtualenv

virtualenv -p python3.7 venv
. venv/bin/activate
pip3 install -r requirements_dev.txt
python setup.py develop

Testing

After installing our requirements (see above), you can:

cd tests
pytest

Note that tests/libp2p/test_libp2p.py contains an end-to-end messaging test between two libp2p hosts, which is the bulk of our proof of concept.

Feature Breakdown

py-libp2p aims for conformity with the standard libp2p modules. Below is a breakdown of the modules we have developed, are developing, and may develop in the future.

Legend: 🍏 Done Β  πŸ‹ In Progress Β  πŸ… Missing Β  🌰 Not planned

libp2p Node Status
libp2p 🍏
Identify Protocol Status
Identify πŸ…
Transport Protocols Status
TCP πŸ‹ tests
UDP πŸ…
WebSockets πŸ…
UTP πŸ…
WebRTC πŸ…
SCTP 🌰
Tor 🌰
i2p 🌰
cjdns 🌰
Bluetooth LE 🌰
Audio TP 🌰
Zerotier 🌰
QUIC 🌰
Stream Muxers Status
multiplex πŸ‹ tests
yamux πŸ…
benchmarks 🌰
muxado 🌰
spdystream 🌰
spdy 🌰
http2 🌰
QUIC 🌰
Protocol Muxers Status
multiselect 🍏
Switch (Swarm) Status
Switch πŸ‹ tests
Dialer stack 🌰
Peer Discovery Status
bootstrap list 🍏
Kademlia DHT πŸ…
mDNS πŸ…
PEX 🌰
DNS 🌰
Content Routing Status
Kademlia DHT πŸ…
floodsub πŸ…
gossipsub πŸ…
PHT 🌰
Peer Routing Status
Kademlia DHT πŸ…
floodsub πŸ…
gossipsub πŸ…
PHT 🌰
NAT Traversal Status
nat-pmp πŸ…
upnp πŸ…
ext addr discovery 🌰
STUN-like 🌰
line-switch relay 🌰
pkt-switch relay 🌰
Exchange Status
HTTP 🌰
Bitswap 🌰
Bittorrent 🌰
Consensus Status
Paxos 🌰
Raft 🌰
PBTF 🌰
Nakamoto 🌰

Explanation of Basic Two Node Communication

Core Concepts

(non-normative, useful for team notes, not a reference)

Several components of the libp2p stack take part when establishing a connection between two nodes:

  1. Host: a node in the libp2p network.
  2. Connection: the layer 3 connection between two nodes in a libp2p network.
  3. Transport: the component that creates a Connection, e.g. TCP, UDP, QUIC, etc.
  4. Streams: an abstraction on top of a Connection representing parallel conversations about different matters, each of which is identified by a protocol ID. Multiple streams are layered on top of a Connection via the Multiplexer.
  5. Multiplexer: a component that is responsible for wrapping messages sent on a stream with an envelope that identifies the stream they pertain to, normally via an ID. The multiplexer on the other unwraps the message and routes it internally based on the stream identification.
  6. Secure channel: optionally establishes a secure, encrypted, and authenticated channel over the Connection.
  7. Upgrader: a component that takes a raw layer 3 connection returned by the Transport, and performs the security and multiplexing negotiation to set up a secure, multiplexed channel on top of which Streams can be opened.

Communication between two hosts X and Y

(non-normative, useful for team notes, not a reference)

Initiate the connection: A host is simply a node in the libp2p network that is able to communicate with other nodes in the network. In order for X and Y to communicate with one another, one of the hosts must initiate the connection. Let's say that X is going to initiate the connection. X will first open a connection to Y. This connection is where all of the actual communication will take place.

Communication over one connection with multiple protocols: X and Y can communicate over the same connection using different protocols and the multiplexer will appropriately route messages for a given protocol to a particular handler function for that protocol, which allows for each host to handle different protocols with separate functions. Furthermore, we can use multiple streams for a given protocol that allow for the same protocol and same underlying connection to be used for communication about separate topics between nodes X and Y.

Why use multiple streams?: The purpose of using the same connection for multiple streams to communicate over is to avoid the overhead of having multiple connections between X and Y. In order for X and Y to differentiate between messages on different streams and different protocols, a multiplexer is used to encode the messages when a message will be sent and decode a message when a message is received. The multiplexer encodes the message by adding a header to the beginning of any message to be sent that contains the stream id (along with some other info). Then, the message is sent across the raw connection and the receiving host will use its multiplexer to decode the message, i.e. determine which stream id the message should be routed to.

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