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erwin-kok committed Jul 31, 2023
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108 changes: 107 additions & 1 deletion README.md
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Expand Up @@ -90,9 +90,115 @@ See for an in-depth description of libp2p, please see: https://libp2p.io/

## Getting started

First add the proper dependencies to your project:

Kotlin DSL:

```kotlin
repositories {
mavenCentral()
}

dependencies {
implementation("org.erwinkok.result:libp2p-xxx:$latest")
}
```

`libp2p-core` is mandatory, other dependencies are optional depending on your needs. For example, if you need tcp
transport, include `libp2p-transport-tcp`, or if you want the mplex muxer include `libp2p-muxer-plex`.

In your code, first create a host:

```kotlin
val hostBuilder = host {
identity(localIdentity)
muxers {
mplex()
}
securityTransport {
noise()
}
transports {
tcp()
}
peerstore {
gcInterval = 1.hours
keyStore {
password = "APasswordThatIsAtLeast20CharactersLong"
dek {
salt = "W/SC6fnZfBIWdeAD3l+ClLpQtfICEtn+KYTUhfKq6d7l"
}
}
}
swarm {
dialTimeout = 10.minutes
listenAddresses {
multiAddress("/ip4/0.0.0.0/tcp/10333")
}
}
datastore(datastore)
}

val host = hostBuilder.build(scope)
.getOrElse {
logger.error { "The following errors occurred while creating the host: ${errorMessage(it)}" }
return@runBlocking
}
```

The layout is hopefully clear: for example, the code above will use `tcp` as a transport, `noise` for security and
`mplex` as a muxer.

Then you can add a handler:

```kotlin
host.setStreamHandler(ProtocolId.of("/chat/1.0.0")) {
chatHandler(it)
}
```
This means that if a peer connects and requests the `/chat/1.0.0` protocol, the corresponding handler will be called.

To call a peer and open a new stream, use the following code:

```kotlin
val stream = host.newStream(aPeerId, ProtocolId.of("/chat/1.0.0"))
.getOrElse {
logger.error { "Could not open chat stream with peer: ${errorMessage(it)}" }
return@runBlocking
}
chatHandler(stream)
```

This tries to connect to peer `aPeerId` and tries to open a new stream for protocol `/chat/1.0.0`. If it fails, it
returns if it succeeds it progresses to the chatHandler.

See also the example application in `app`.

To use this sample app, start the application. It will create a new random LocalIdentity (key-pair) and logs the adres
on which it listens on the output:

```shell
[main] o.e.l.a.ApplicationKt$main$1: Local addresses the Host listens on: /ip4/0.0.0.0/tcp/10333/p2p/12D3KooWDfaEJxpmjbFLb9wUakCd6Lo6LRntaV3drb4EaYZRtYuY
```

In the libp2p-Go repository you can find `chat` in the examples directory. Then you can connect to the running instance
by using:

```shell
./chat -d /ip4/0.0.0.0/tcp/10333/p2p/12D3KooWDfaEJxpmjbFLb9wUakCd6Lo6LRntaV3drb4EaYZRtYuY
```

On both sides it should mention that a connection is established.

## Contact

If you want to contact me, please write an e-mail to: [[email protected]](mailto:[email protected])
If you want to contact me, please write an e-mail to: [[email protected]](mailto:[email protected])

## Acknowledgements

This work is largely based on the awesome libp2p-go implementation. This work would not have been possible without their
effort. Please consider giving kudos to the libp2p-go authors.
(See also [`ACKNOWLEDGEMENTS`](ACKNOWLEDGEMENTS.md))

## License

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2 changes: 1 addition & 1 deletion build-logic/src/main/kotlin/libp2p.publish.gradle.kts
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Expand Up @@ -37,7 +37,7 @@ publishing {
developer {
id.set("erwin-kok")
name.set("Erwin Kok")
email.set("erwin.kok@protonmail.com")
email.set("erwin-kok@gmx.com")
url.set("https://github.com/erwin-kok/")
roles.set(listOf("owner", "developer"))
}
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