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nim-libp2p
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Dmitriy Ryajov 2021-06-29 11:41:34 -06:00
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12
README.md
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@ -18,10 +18,12 @@
## Introduction
An implementation of [libp2p](https://libp2p.io/) in Nim. Also provides a Nim wrapper of the [Libp2p Go daemon](https://github.com/libp2p/go-libp2p).
An implementation of [libp2p](https://libp2p.io/) in Nim.
## Project Status
The current native Nim libp2p implementation support is experimental and shouldn't be relied on for production use. It is under active development and contributions are highly welcomed. :)
libp2p is now used in production by a few projects at [status](https://github.com/status-im), including [nimbus](https://github.com/status-im/nimbus-eth2).
While far from complete, currently available componets are fairly stable.
Check our [examples folder](/examples) to get started!
@ -88,12 +90,6 @@ git clone https://github.com/status-im/nim-libp2p
cd nim-libp2p
nimble install
```
### Tests
#### Prerequisite
- [Go 1.12+](https://golang.org/dl/)
#### Run unit tests
```sh
# run all the unit tests

56
docs/GO_DAEMON.md
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@ -1,56 +0,0 @@
# Table of Contents
- [Introduction](#introduction)
- [Installation](#installation)
- [Usage](#usage)
- [Example](#example)
- [Getting Started](#getting-started)
# Introduction
This is a libp2p-backed daemon wrapping the functionalities of go-libp2p for use in Nim. <br>
For more information about the go daemon, check out [this repository](https://github.com/libp2p/go-libp2p-daemon).
# Installation
```sh
# clone and install dependencies
git clone https://github.com/status-im/nim-libp2p
cd nim-libp2p
nimble install
# perform unit tests
nimble test
# update the git submodule to install the go daemon
git submodule update --init --recursive
go version
git clone https://github.com/libp2p/go-libp2p-daemon
cd go-libp2p-daemon
git checkout v0.0.1
go install ./...
cd ..
```
# Usage
## Example
Examples can be found in the [examples folder](https://github.com/status-im/nim-libp2p/tree/readme/examples/go-daemon)
## Getting Started
Try out the chat example. Full code can be found [here](https://github.com/status-im/nim-libp2p/blob/master/examples/chat.nim):
```bash
nim c -r --threads:on examples\chat.nim
```
This will output a peer ID such as `QmbmHfVvouKammmQDJck4hz33WvVktNEe7pasxz2HgseRu` which you can use in another instance to connect to it.
```bash
./example/chat
/connect QmbmHfVvouKammmQDJck4hz33WvVktNEe7pasxz2HgseRu
```
You can now chat between the instances!
![Chat example](https://imgur.com/caYRu8K.gif)

4
docs/api/libp2p/daemonapi.md
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@ -38,13 +38,13 @@ Examples can be found in the [examples folder](https://github.com/status-im/nim-
Try out the chat example. Full code can be found [here](https://github.com/status-im/nim-libp2p/blob/master/examples/chat.nim):
```bash
nim c -r --threads:on examples\chat.nim
nim c -r --threads:on examples/directchat.nim
```
This will output a peer ID such as `QmbmHfVvouKammmQDJck4hz33WvVktNEe7pasxz2HgseRu` which you can use in another instance to connect to it.
```bash
./example/chat
./examples/directchat
/connect QmbmHfVvouKammmQDJck4hz33WvVktNEe7pasxz2HgseRu
```

150
docs/tutorial/second.nim
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@ -1,23 +1,26 @@
when not(compileOption("threads")):
{.fatal: "Please, compile this program with the --threads:on option!".}
import tables, strformat, strutils
import chronos
import ../libp2p/[switch,
multistream,
crypto/crypto,
protocols/identify,
connection,
transports/transport,
transports/tcptransport,
multiaddress,
peerinfo,
peerid,
protocols/protocol,
protocols/secure/secure,
protocols/secure/secio,
muxers/muxer,
muxers/mplex/mplex]
import tables, strformat, strutils, bearssl
import chronos # an efficient library for async
import ../libp2p/[switch, # manage transports, a single entry point for dialing and listening
builders, # helper to build the switch object
multistream, # tag stream with short header to identify it
multicodec, # multicodec utilities
crypto/crypto, # cryptographic functions
errors, # error handling utilities
protocols/identify, # identify the peer info of a peer
stream/connection, # create and close stream read / write connections
transports/transport, # listen and dial to other peers using p2p protocol
transports/tcptransport, # listen and dial to other peers using client-server protocol
multiaddress, # encode different addressing schemes. For example, /ip4/7.7.7.7/tcp/6543 means it is using IPv4 protocol and TCP
peerinfo, # manage the information of a peer, such as peer ID and public / private key
peerid, # Implement how peers interact
protocols/protocol, # define the protocol base type
protocols/secure/secure, # define the protocol of secure connection
protocols/secure/secio, # define the protocol of secure input / output, allows encrypted communication that uses public keys to validate signed messages instead of a certificate authority like in TLS
muxers/muxer, # define an interface for stream multiplexing, allowing peers to offer many protocols over a single connection
muxers/mplex/mplex] # define some contants and message types for stream multiplexing
const ChatCodec = "/nim-libp2p/chat/1.0.0"
const DefaultAddr = "/ip4/127.0.0.1/tcp/55505"
@ -37,31 +40,33 @@ type ChatProto = ref object of LPProtocol
connected: bool # if the node is connected to another peer
started: bool # if the node has started
# copied from https://github.com/status-im/nimbus-eth2/blob/0ed657e953740a92458f23033d47483ffa17ccb0/beacon_chain/eth2_network.nim#L109-L115
proc initAddress(T: type MultiAddress, str: string): T =
let address = MultiAddress.init(str)
if IPFS.match(address) and matchPartial(multiaddress.TCP, address):
result = address
else:
raise newException(MultiAddressError,
"Invalid bootstrap node multi-address")
proc dialPeer(p: ChatProto, address: string) {.async.} =
let multiAddr = MultiAddress.initAddress(address);
let parts = address.split("/")
let remotePeer = PeerInfo.init(parts[^1],
[multiAddr])
echo &"dialing peer: {multiAddr}"
p.conn = await p.switch.dial(remotePeer, ChatCodec)
p.connected = true
proc readAndPrint(p: ChatProto) {.async.} =
while true:
while p.connected:
echo cast[string](await p.conn.readLp(1024))
var strData = await p.conn.readLp(1024)
strData &= '\0'.uint8
var str = cast[cstring](addr strdata[0])
echo $p.switch.peerInfo.peerId & ": " & $str
await sleepAsync(100.millis)
proc dialPeer(p: ChatProto, address: string) {.async.} =
let
multiAddr = MultiAddress.init(address).tryGet()
# split the peerId part /p2p/...
peerIdBytes = multiAddr[multiCodec("p2p")]
.tryGet()
.protoAddress()
.tryGet()
remotePeer = PeerID.init(peerIdBytes).tryGet()
# split the wire address
ip4Addr = multiAddr[multiCodec("ip4")].tryGet()
tcpAddr = multiAddr[multiCodec("tcp")].tryGet()
wireAddr = ip4Addr & tcpAddr
echo &"dialing peer: {multiAddr}"
p.conn = await p.switch.dial(remotePeer, @[wireAddr], ChatCodec)
p.connected = true
asyncSpawn p.readAndPrint()
proc writeAndPrint(p: ChatProto) {.async.} =
while true:
if not p.connected:
@ -110,21 +115,31 @@ proc writeAndPrint(p: ChatProto) {.async.} =
await p.conn.writeLp(line)
else:
try:
if line.startsWith("/") and "ipfs" in line:
if line.startsWith("/") and "p2p" in line:
await p.dialPeer(line)
except:
echo &"unable to dial remote peer {line}"
echo getCurrentExceptionMsg()
proc readWriteLoop(p: ChatProto) {.async.} =
asyncSpawn p.writeAndPrint() # execute the async function but does not block
asyncSpawn p.readAndPrint()
await p.writeAndPrint()
proc processInput(rfd: AsyncFD) {.async.} =
let transp = fromPipe(rfd)
while true:
let a = await transp.readLine()
echo "You just entered: " & a
proc newChatProto(switch: Switch, transp: StreamTransport): ChatProto =
var chatproto = ChatProto(switch: switch, transp: transp, codecs: @[ChatCodec])
# create handler for incoming connection
proc handle(stream: Connection, proto: string) {.async.} =
if chatproto.connected and not chatproto.conn.closed:
echo "a chat session is already in progress - disconnecting!"
await stream.close()
else:
chatproto.conn = stream
chatproto.connected = true
await chatproto.readAndPrint()
# assign the new handler
chatproto.handler = handle
return chatproto
proc readInput(wfd: AsyncFD) {.thread.} =
## This procedure performs reading from `stdin` and sends data over
@ -135,7 +150,48 @@ proc readInput(wfd: AsyncFD) {.thread.} =
let line = stdin.readLine()
discard waitFor transp.write(line & "\r\n")
proc processInput(rfd: AsyncFD, rng: ref BrHmacDrbgContext) {.async.} =
let transp = fromPipe(rfd)
let seckey = PrivateKey.random(RSA, rng[]).get()
var localAddress = DefaultAddr
while true:
echo &"Type an address to bind to or Enter to use the default {DefaultAddr}"
let a = await transp.readLine()
try:
if a.len > 0:
localAddress = a
break
# uise default
break
except:
echo "invalid address"
localAddress = DefaultAddr
continue
var switch = SwitchBuilder
.init()
.withRng(rng)
.withPrivateKey(seckey)
.withAddress(MultiAddress.init(localAddress).tryGet())
.build()
let chatProto = newChatProto(switch, transp)
switch.mount(chatProto)
let libp2pFuts = await switch.start()
chatProto.started = true
let id = $switch.peerInfo.peerId
echo "PeerID: " & id
echo "listening on: "
for a in switch.peerInfo.addrs:
echo &"{a}/p2p/{id}"
await chatProto.readWriteLoop()
await allFuturesThrowing(libp2pFuts)
proc main() {.async.} =
let rng = newRng() # Singe random number source for the whole application
let (rfd, wfd) = createAsyncPipe()
if rfd == asyncInvalidPipe or wfd == asyncInvalidPipe:
raise newException(ValueError, "Could not initialize pipe!")
@ -143,7 +199,7 @@ proc main() {.async.} =
var thread: Thread[AsyncFD]
thread.createThread(readInput, wfd)
await processInput(rfd)
await processInput(rfd, rng)
when isMainModule: # isMainModule = true when the module is compiled as the main file
waitFor(main())

86
examples/directchat.nim
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@ -4,7 +4,9 @@ when not(compileOption("threads")):
import tables, strformat, strutils, bearssl
import chronos # an efficient library for async
import ../libp2p/[switch, # manage transports, a single entry point for dialing and listening
builders, # helper to build the switch object
multistream, # tag stream with short header to identify it
multicodec, # multicodec utilities
crypto/crypto, # cryptographic functions
errors, # error handling utilities
protocols/identify, # identify the peer info of a peer
@ -38,33 +40,33 @@ type ChatProto = ref object of LPProtocol
connected: bool # if the node is connected to another peer
started: bool # if the node has started
proc initAddress(T: type MultiAddress, str: string): T =
let address = MultiAddress.init(str).tryGet()
if IPFS.match(address) and matchPartial(multiaddress.TCP, address):
result = address
else:
raise newException(ValueError,
"Invalid bootstrap node multi-address")
proc dialPeer(p: ChatProto, address: string) {.async.} =
let multiAddr = MultiAddress.initAddress(address);
let parts = address.split("/")
let remotePeer = PeerInfo.init(parts[^1],
[multiAddr])
echo &"dialing peer: {multiAddr}"
p.conn = await p.switch.dial(remotePeer, ChatCodec)
p.connected = true
proc readAndPrint(p: ChatProto) {.async.} =
while true:
while p.connected:
# TODO: echo &"{p.id} -> "
echo cast[string](await p.conn.readLp(1024))
var strData = await p.conn.readLp(1024)
strData &= '\0'.uint8
var str = cast[cstring](addr strdata[0])
echo $p.switch.peerInfo.peerId & ": " & $str
await sleepAsync(100.millis)
proc dialPeer(p: ChatProto, address: string) {.async.} =
let
multiAddr = MultiAddress.init(address).tryGet()
# split the peerId part /p2p/...
peerIdBytes = multiAddr[multiCodec("p2p")]
.tryGet()
.protoAddress()
.tryGet()
remotePeer = PeerID.init(peerIdBytes).tryGet()
# split the wire address
ip4Addr = multiAddr[multiCodec("ip4")].tryGet()
tcpAddr = multiAddr[multiCodec("tcp")].tryGet()
wireAddr = ip4Addr & tcpAddr
echo &"dialing peer: {multiAddr}"
p.conn = await p.switch.dial(remotePeer, @[wireAddr], ChatCodec)
p.connected = true
asyncSpawn p.readAndPrint()
proc writeAndPrint(p: ChatProto) {.async.} =
while true:
if not p.connected:
@ -113,15 +115,14 @@ proc writeAndPrint(p: ChatProto) {.async.} =
await p.conn.writeLp(line)
else:
try:
if line.startsWith("/") and "ipfs" in line:
if line.startsWith("/") and "p2p" in line:
await p.dialPeer(line)
except:
echo &"unable to dial remote peer {line}"
echo getCurrentExceptionMsg()
proc readWriteLoop(p: ChatProto) {.async.} =
asyncSpawn p.writeAndPrint() # execute the async function but does not block
asyncSpawn p.readAndPrint()
await p.writeAndPrint()
proc newChatProto(switch: Switch, transp: StreamTransport): ChatProto =
var chatproto = ChatProto(switch: switch, transp: transp, codecs: @[ChatCodec])
@ -134,6 +135,7 @@ proc newChatProto(switch: Switch, transp: StreamTransport): ChatProto =
else:
chatproto.conn = stream
chatproto.connected = true
await chatproto.readAndPrint()
# assign the new handler
chatproto.handler = handle
@ -152,48 +154,38 @@ proc processInput(rfd: AsyncFD, rng: ref BrHmacDrbgContext) {.async.} =
let transp = fromPipe(rfd)
let seckey = PrivateKey.random(RSA, rng[]).get()
let peerInfo = PeerInfo.init(seckey)
var localAddress = DefaultAddr
while true:
echo &"Type an address to bind to or Enter to use the default {DefaultAddr}"
let a = await transp.readLine()
try:
if a.len > 0:
peerInfo.addrs.add(Multiaddress.init(a).tryGet())
localAddress = a
break
peerInfo.addrs.add(Multiaddress.init(localAddress).tryGet())
# uise default
break
except:
echo "invalid address"
localAddress = DefaultAddr
continue
# a constructor for building different multiplexers under various connections
proc createMplex(conn: Connection): Muxer =
result = Mplex.init(conn)
let mplexProvider = newMuxerProvider(createMplex, MplexCodec)
let transports = @[Transport(TcpTransport.init())]
let muxers = [(MplexCodec, mplexProvider)].toTable()
let identify = newIdentify(peerInfo)
let secureManagers = [Secure(newSecio(rng, seckey))]
let switch = newSwitch(peerInfo,
transports,
identify,
muxers,
secureManagers)
var switch = SwitchBuilder
.init()
.withRng(rng)
.withPrivateKey(seckey)
.withAddress(MultiAddress.init(localAddress).tryGet())
.build()
let chatProto = newChatProto(switch, transp)
switch.mount(chatProto)
let libp2pFuts = await switch.start()
chatProto.started = true
let id = $peerInfo.peerId
let id = $switch.peerInfo.peerId
echo "PeerID: " & id
echo "listening on: "
for a in peerInfo.addrs:
echo &"{a}/ipfs/{id}"
for a in switch.peerInfo.addrs:
echo &"{a}/p2p/{id}"
await chatProto.readWriteLoop()
await allFuturesThrowing(libp2pFuts)