8 Commits
Author SHA1 Message Date
sergeych 26564b6081 0.4.1: performance, incompatible keys ID (as of crypto2 upgrade), fixed tests to properly run on Macos on arm64 target 2024-08-19 18:34:11 +02:00
sergeych 9ddb1209c9 more UDP tests 2024-08-11 19:08:49 +02:00
sergeych b68232653a readme docs 2024-08-11 16:31:08 +02:00
sergeych 2e4f551e8e more docs 2024-08-11 16:28:09 +02:00
sergeych 40b8723132 0.3.2: UDP timeout support, fix #4 2024-08-11 15:11:32 +02:00
sergeych 4d178d951f 0.3.2: UDP support 2024-08-11 14:17:54 +02:00
sergeych f6fbf8e58e readme fixes 2024-08-10 11:39:37 +02:00
sergeych 3c915a8f58 updates for moved home page in gitea 2024-08-10 11:37:02 +02:00
23 changed files with 1045 additions and 93 deletions

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<component name="ArtifactManager">
<artifact type="jar" name="kiloparsec-js-0.3.1">
<output-path>$PROJECT_DIR$/build/libs</output-path>
<root id="archive" name="kiloparsec-js-0.3.1.jar">
<element id="module-output" name="kiloparsec.jsMain" />
</root>
</artifact>
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<component name="ArtifactManager">
<artifact type="jar" name="kiloparsec-js-0.3.2">
<output-path>$PROJECT_DIR$/build/libs</output-path>
<root id="archive" name="kiloparsec-js-0.3.2.jar">
<element id="module-output" name="kiloparsec.jsMain" />
</root>
</artifact>
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<component name="ArtifactManager">
<artifact type="jar" name="kiloparsec-js-0.3.3">
<output-path>$PROJECT_DIR$/build/libs</output-path>
<root id="archive" name="kiloparsec-js-0.3.3.jar">
<element id="module-output" name="kiloparsec.jsMain" />
</root>
</artifact>
</component>
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<component name="ArtifactManager">
<artifact type="jar" name="kiloparsec-jvm-0.3.1">
<output-path>$PROJECT_DIR$/build/libs</output-path>
<root id="archive" name="kiloparsec-jvm-0.3.1.jar">
<element id="module-output" name="kiloparsec.jvmMain" />
</root>
</artifact>
</component>
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<component name="ArtifactManager">
<artifact type="jar" name="kiloparsec-jvm-0.3.2">
<output-path>$PROJECT_DIR$/build/libs</output-path>
<root id="archive" name="kiloparsec-jvm-0.3.2.jar">
<element id="module-output" name="kiloparsec.jvmMain" />
</root>
</artifact>
</component>
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<component name="ArtifactManager">
<artifact type="jar" name="kiloparsec-jvm-0.3.3">
<output-path>$PROJECT_DIR$/build/libs</output-path>
<root id="archive" name="kiloparsec-jvm-0.3.3.jar">
<element id="module-output" name="kiloparsec.jvmMain" />
</root>
</artifact>
</component>
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@@ -1,16 +1,19 @@
# Kiloparsec
__Recommended version is `0.3.1`: to keep the code compatible with current and further versions we
ask to upgrade to `0.3.1` at least.__
__Recommended version is `0.4.1`: to keep the code compatible with current and further versions we
ask to upgrade to `0.4.2` at least.__ Starting from this version some pacakage names are changed for
better clarity and fast UDP endpoints are added.
The new generation of __PARanoid SECurity__ protocol, advanced, faster, more secure. It also allows connecting any "
block device" transport to the same local interface. Out if the box it
provides the following transports:
| name | JVM | JS | native |
|----------------|-----|----|----------|
| TCP/IP server | ✓ | | >= 0.2.6 |
| TCP/IP client | ✓ | | >= 0.2.6 |
|----------------|--------|----|--------|
| TCP/IP server | ✓ | | 0.2.6+ |
| TCP/IP client | ✓ | | 0.2.6+ |
| UDP server | 0.3.2+ | | 0.3.2+ |
| UDP client | 0.3.2+ | | 0.3.2+ |
| Websock server | ✓ | | |
| Websock client | ✓ | ✓ | ✓ |
@@ -19,31 +22,41 @@ provides the following transports:
Protocols >= 0.3.0 are not binary compatible with previous version due to more compact binary
format. The format from 0.3.0 onwards is supposed to keep compatible.
#### ID calculation algorithm is changed since 0.4.1
We recommend to upgrade to 0.4+ ASAP as public/shared key id derivation method was changed for even higher security.
### Supported native targets
- iosArm64, iosX64
- macosArm64, macosArm64
- linxArm64, linuxX64
- linuxArm64, linuxX64
### Non-native targets
- JS (browser and nodeJS)
- JVM (android, macos, windows, linx, everywhere where JRE is installed)
## TCP/IP transport
## TCP/IP and UDP transports
It is the fastest based on async socket implementation of ktor client. It works everywhere but JS target as
These are the fastest based on async socket implementation of ktor client. They works everywhere but JS target as
there is currently no widely adopted sockets for browser javascript.
While UDP is faster than TCP/IP, it is less reliable, especially with commands and return values that serializes to more than 240 bytes approx, and has no retransmission facilities (use TCP!). UDP though shines when all you need is to [push](https://code.sergeych.net/docs/kiloparsec/kiloparsec/net.sergeych.kiloparsec/-remote-interface/push.html) with little or no data in it.
## Websock server
While it is much slower than pure TCP, it is still faster than any http-based transport. It uses binary frames based on
While it is much slower than TCP or UDP, it is still faster than any http-based API; it uses binary frames based on
the Ktor server framework to easily integrate with web services. We recommend using it instead of a classic HTTP API as
it beats it in terms of speed and server load even with HTTP/2.
We recommend to create the `KiloInterface<S>` instance and connect it to the websock and tcp servers in real
applications to get easy access from anywhere.
## Websocket client
It is slower than TCP or UDP, but it works on literally all platforms. See the sample below.
# Usage
The library should be used as maven dependency, not as source.
@@ -67,7 +80,7 @@ It could be, depending on your project structure, something like:
```kotlin
val commonMain by getting {
dependencies {
api("net.sergeych:kiloparsec:0.3.1")
api("net.sergeych:kiloparsec:0.4.1")
}
}
```
@@ -165,12 +178,38 @@ Documentation is available in samples here:
- [TCP/IP client](https://code.sergeych.net/docs/kiloparsec/kiloparsec/net.sergeych.kiloparsec/-kilo-client/index.html)
In short, there are two functions that implements aysnchronous TCP/IP transport on all platforms buy JS:
In short, there are two functions that implements asynchronous TCP/IP transport on all platforms buy JS:
- [acceptTcpDevice](https://code.sergeych.net/docs/kiloparsec/kiloparsec/net.sergeych.kiloparsec.adapter/accept-tcp-device.html?query=fun%20acceptTcpDevice(port:%20Int):%20Flow%3CInetTransportDevice%3E) to create a server
- [connectTcpDevice](https://code.sergeych.net/docs/kiloparsec/kiloparsec/net.sergeych.kiloparsec.adapter/connect-tcp-device.html) to connect to the server
## UDP client and server
Is very much straightforward, same as with TCP/IP:
- [UDP server creation](https://code.sergeych.net/docs/kiloparsec/kiloparsec/net.sergeych.kiloparsec.adapter/accept-udp-device.html)
- [Connect UDP client](https://code.sergeych.net/docs/kiloparsec/kiloparsec/net.sergeych.kiloparsec.adapter/connect-udp-device.html)
### UDP specifics
#### Command size
Each command invocation and result are packed in a separate UDP diagram using effective binary packing.
Thus for the best results commands and results should be relatively short, best to fit into 240 bytes. While bigger datagrams are often transmitted successfully, the probability of the effective transmission drops with the size.
Kiloparsec UDP transport does not retransmits not delivered packets. Use TCP/IP or websocket if it is a concern.
For the best results we recommend using [push](https://code.sergeych.net/docs/kiloparsec/kiloparsec/net.sergeych.kiloparsec/-remote-interface/index.html#1558240250%2FFunctions%2F788909594) for remote interfaces with UDP.
#### Timeouts
As Datagrams do not form protocol itself, kiloparsec issues pings when no data is circulated between parties.
When no pings are received long enough, kiloparsec connection is closed. There are `maxInactivityTimeout` in all
relevant functions and constructors.
Client shoudl not issue pings manually.
## Reusing code between servers
The same instance of the [KiloInterface](https://code.sergeych.net/docs/kiloparsec/kiloparsec/net.sergeych.kiloparsec/-kilo-interface/index.html?query=open%20class%20KiloInterface%3CS%3E%20:%20LocalInterface%3CKiloScope%3CS%3E%3E) could easily be reused with all instances of servers with different protocols.
@@ -181,7 +220,7 @@ This is a common proactive to create a business logic in a `KiloInterface`, then
We do not recommend to rely on TLS (HTTPS://, WSS://) host identification solely, in the modern world there is
a high probability of attacks on unfriendly (in respect to at least some of your users) states to the SSL certificates
chain, in which case the MITM and spoofing will be undetected. Check the [remoteId](https://code.sergeych.net/docs/kiloparsec/kiloparsec/net.sergeych.kiloparsec/-kilo-client/remote-id.html?query=suspend%20fun%20remoteId():%20VerifyingPublicKey?) in your client on each connection and provide the safe [serverSecretKey](https://code.sergeych.net/docs/kiloparsec/kiloparsec/net.sergeych.kiloparsec/-kilo-server/index.html?query=class%20KiloServer%3CS%3E(clientInterface:%20KiloInterface%3CS%3E,%20connections:%20Flow%3CInetTransportDevice%3E,%20serverSecretKey:%20SigningKey?%20=%20null,%20sessionBuilder:%20()%20-%3E%20S) when creating a server.
chain, in which case the MITM and spoofing will be undetected. Check the [remoteId](https://code.sergeych.net/docs/kiloparsec/kiloparsec/net.sergeych.kiloparsec/-kilo-client/remote-id.html?query=suspend%20fun%20remoteId():%20VerifyingPublicKey?) in your client on each connection and provide the safe [serverSecretKey](https://code.sergeych.net/docs/kiloparsec/kiloparsec/net.sergeych.kiloparsec/-kilo-server/index.html) when creating a server.
This will effectively protetcs against certificate chain spoofing in the case of the application installed from the trusted source.
@@ -191,7 +230,7 @@ transparently substitute the whole site. In the case of we applications we stron
## See also:
- [Source documentation](https://code.sergeych.net/docs/kiloparsec/)
- [Project's WIKI](https://gitea.sergeych.net/sergeych/kiloparsec/wiki)
- [Project's WIKI](https://gitea.sergeych.net/SergeychWorks/kiloparsec/wiki)
# Details
+3 -3
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@@ -1,12 +1,12 @@
plugins {
kotlin("multiplatform") version "2.0.0"
kotlin("multiplatform") version "2.0.10"
id("org.jetbrains.kotlin.plugin.serialization") version "2.0.0"
`maven-publish`
id("org.jetbrains.dokka") version "1.9.20"
}
group = "net.sergeych"
version = "0.3.1"
version = "0.4.1"
repositories {
mavenCentral()
@@ -44,7 +44,7 @@ kotlin {
implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.3")
implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.7.1")
api("io.ktor:ktor-client-core:$ktor_version")
api("net.sergeych:crypto2:0.4.2")
api("net.sergeych:crypto2:0.5.3")
}
}
val ktorSocketMain by creating {
@@ -89,6 +89,7 @@ class KiloClient<S>(
}
_state.value = false
resetDeferredClient()
// reconnection timeout
delay(100)
}
}
@@ -74,7 +74,11 @@ open class LocalInterface<S> : Loggable by LogTag("LocalInterface${idCounter.inc
private val errorByClass = mutableMapOf<KClass<*>, String>()
private val errorBuilder = mutableMapOf<String, (String, UByteArray?) -> Throwable>()
fun <T : Throwable> registerError(
/**
* Register exception for automatic transmission over the kiloparsec connection using its [klass]
* and possibly override code. In most cases it is simpler to use [registerError].
*/
fun <T : Throwable> registerErrorClass(
klass: KClass<T>, code: String = klass.simpleName!!,
exceptionBuilder: (String, UByteArray?) -> T,
) {
@@ -82,10 +86,17 @@ open class LocalInterface<S> : Loggable by LogTag("LocalInterface${idCounter.inc
errorBuilder[code] = exceptionBuilder
}
/**
* Register an exception to be transmitted automatically over the kiloparsec connection.
* Example:
* ```kotlin
* localInterface.registerError { IllegalArgumentException(it) }
* ```
*/
inline fun <reified T : Throwable> registerError(
noinline exceptionBuilder: (String) -> T,
) {
registerError(T::class) { msg, _ -> exceptionBuilder(msg) }
registerErrorClass(T::class) { msg, _ -> exceptionBuilder(msg) }
}
val errorProviders = mutableListOf<LocalInterface<*>>()
@@ -47,7 +47,14 @@ interface RemoteInterface {
suspend fun <R> call(cmd: Command<Unit, R>): R = call(cmd, Unit)
/**
* Call the remote procedure with specified args and return its result
* Call the remote procedure with specified [args] and return its result of type [R]. The calling coroutine
* suspends until the request is performed on the remote side and the result value (also `Unit`) will be received.
*
* When it is not necessary to wait for the return value and/or command execution, it is recommended to
* use [push] instead.
*
* @throws RemoteException if the execution caused exception on the remote size
* @throws Exception for registered exceptions, see [LocalInterface.registerError], etc.
*/
suspend fun <A, R> call(cmd: Command<A, R>, args: A): R
@@ -55,6 +62,8 @@ interface RemoteInterface {
* Push the notification without waiting for reception or processing.
* It returns immediately after sending data to the transport (e.g., to the network).
* Use [call] if it is necessary to wait until the command will be received and processed by the remote.
*
* Push is onlu available for commands without returned value.
*/
suspend fun <A> push(cmd: Command<A, Unit>, args: A)
@@ -231,7 +231,6 @@ class Transport<S>(
.also { debug { "command executed: ${b.name}" } }
}
}
debug { "=---------------------------------------------" }
}
debug { "input step performed closed=$isClosed active=$isActive" }
} catch (_: ClosedSendChannelException) {
@@ -1,6 +1,24 @@
package net.sergeych.kiloparsec
import kotlinx.coroutines.sync.Mutex
import kotlinx.coroutines.sync.withLock
fun String.encodeToUByteArray() =
encodeToByteArray().toUByteArray()
fun UByteArray.decodeFromUByteArray(): String = toByteArray().decodeToString()
class SyncValue<T>(initialValue: T) {
private val access = Mutex()
var value = initialValue
private set
suspend fun mutate(f: suspend (T)->T): T = access.withLock { f(value).also { value = it } }
@Suppress("unused")
suspend fun getAndSet(newValue: T): T = mutate {
val old = value
value = newValue
old
}
}
@@ -27,15 +27,15 @@ private val logCounter = AtomicCounter(0)
class ProtocolException(text: String, cause: Throwable? = null) : RuntimeException(text, cause)
const val MAX_TCP_BLOCK_SIZE = 16776216
val PING_INACTIVITY_TIME = 30.seconds
internal val PING_INACTIVITY_TIME = 30.seconds
/**
* Listen for incoming TCP/IP connections on all local interfaces and the specified [port]
* anc create flow of [InetTransportDevice] suitable for [KiloClient].
*/
fun acceptTcpDevice(port: Int): Flow<InetTransportDevice> {
fun acceptTcpDevice(port: Int,localInterface: String = "0.0.0.0"): Flow<InetTransportDevice> {
val selectorManager = SelectorManager(Dispatchers.IO)
val serverSocket = aSocket(selectorManager).tcp().bind("127.0.0.1", port)
val serverSocket = aSocket(selectorManager).tcp().bind(localInterface, port)
return flow {
while (true) {
serverSocket.accept().let { sock ->
@@ -0,0 +1,102 @@
package net.sergeych.kiloparsec.adapter
import io.ktor.network.sockets.*
import io.ktor.utils.io.core.*
import net.sergeych.crypto2.toDump
import net.sergeych.kiloparsec.adapter.UdpBlock.Companion.CANCEL_BLOCK
import net.sergeych.kiloparsec.adapter.UdpBlock.Companion.ESCAPE_BYTE
import net.sergeych.kiloparsec.adapter.UdpBlock.Companion.PING_BLOCK
import net.sergeych.kiloparsec.adapter.UdpBlock.Companion.decode
/**
* Encoded block for UDP datagram space-savvy. Minimum dara size is two bytes, which is fine
* for Kiloparsec blocks.
*
* First byte is encoded using [ESCAPE_BYTE] depending on the second byte:
*
* | 0 | 1 | meaning |
* |---|---|---------|
* | [ESCAPE_BYTE] | [ESCAPE_BYTE] | Data block, dropping first byte |
* | [ESCAPE_BYTE] | [PING_BLOCK] | Ping block, reset timers |
* | [ESCAPE_BYTE] | [CANCEL_BLOCK] | close connection |
* | any other | * | data block, all bytes |
*
* Use [encoded] and [toDatagram] to create binary or the datagram from a block, and [decode] to restore.
*
* We do not use serialization to speed up the transport layer.
*/
sealed class UdpBlock {
/**
* Block to show that the connection is closed and should also be closed on the other side
*/
object Cancel : UdpBlock()
/**
* Parties show pings if there is no activity to keep it alive, detect connection loss and in some
* cases revive NAT/Proxy state in routers.
*/
object Ping : UdpBlock()
/**
* Parsec data block. Could not be smaller than two bytes.
*/
class Data(val data: UByteArray) : UdpBlock() {
override fun toString(): String {
return "UDP Data (${data.size}):\n${data.toDump()}"
}
init {
if( data.size < 2) throw IllegalArgumentException("data must be at least 2 bytes")
}
}
val encoded: UByteArray by lazy {
when(this) {
is Data -> {
// Do we need escaping?
if( data[0] == ESCAPE_BYTE )
escapeAsArray + data
else
data
}
is Cancel -> cancelAsArray
is Ping -> pingAsArray
}
}
fun toDatagram(address: SocketAddress): Datagram {
val encoded = encoded.toByteArray()
return Datagram(ByteReadPacket(encoded, 0, encoded.size), address)
}
companion object {
val ESCAPE_BYTE = 255.toUByte()
val PING_BLOCK = 0.toUByte()
val CANCEL_BLOCK = 1.toUByte()
private val escapeAsArray = ubyteArrayOf(ESCAPE_BYTE)
private val pingAsArray = ubyteArrayOf(ESCAPE_BYTE, PING_BLOCK)
private val cancelAsArray = ubyteArrayOf(ESCAPE_BYTE, CANCEL_BLOCK)
fun decode(data: UByteArray): UdpBlock {
if (data.size < 2)
throw UdpTransportException("block too short: ${data.size}")
return if( data[0] != ESCAPE_BYTE )
// plain data
Data(data)
else {
when(val b2 = data[1]) {
ESCAPE_BYTE -> {
// Escaped first byte, then plain data
Data(data.sliceArray(1 ..< data.size))
}
PING_BLOCK -> Ping
CANCEL_BLOCK -> Cancel
else -> throw UdpTransportException("invalid block type: $b2")
}
}
}
fun decode(datagram: Datagram) =
decode(datagram.packet.readBytes().toUByteArray())
}
}
@@ -0,0 +1,18 @@
package net.sergeych.kiloparsec.adapter
import io.ktor.network.sockets.*
/**
* The interface for common UDP connector shared by UDP components
*/
internal interface UdpConnector {
/**
* Called when client connection is done so the provider could free resources
*/
suspend fun disconnectClient(address: SocketAddress)
/**
* Send a block from a proper UDP socket
*/
suspend fun sendBlock(block: UdpBlock, toAddress: SocketAddress)
}
@@ -0,0 +1,148 @@
package net.sergeych.kiloparsec.adapter
import io.ktor.network.selector.*
import io.ktor.network.sockets.*
import io.ktor.utils.io.CancellationException
import kotlinx.coroutines.*
import kotlinx.coroutines.flow.Flow
import net.sergeych.kiloparsec.KiloClient
import net.sergeych.kiloparsec.KiloServer
import net.sergeych.kiloparsec.RemoteInterface
import net.sergeych.mp_tools.globalLaunch
import net.sergeych.tools.AtomicCounter
import kotlin.time.Duration
import kotlin.time.Duration.Companion.minutes
internal val udpCounter = AtomicCounter(0)
class UdpTransportException(override val message: String) : RemoteInterface.InvalidDataException(message)
/**
* Listen for incoming UDP connections and provide transport flow for it. See also [UdpServer.transportFlow]
* for another way to create a server. Use it with [KiloServer]:
* ```kotlin
* // Whatever server session data we might need:
* data class Session(
* var data: String,
* )
*
* // declare some commands (normally in a shared module):
* val cmdSave by command<String, Unit>()
* val cmdLoad by command<Unit, String>()
* val cmdDrop by command<Unit, Unit>()
* val cmdException by command<Unit, Unit>()
*
* // Interface using the session above, can be shared between many
* // server types and instances (different ports and protocols):
* val cli = KiloInterface<Session>().apply {
* onConnected { session.data = "start" }
* on(cmdSave) { session.data = it }
* on(cmdLoad) {
* session.data
* }
* on(cmdException) {
* throw TestException()
* }
* on(cmdDrop) {
* throw LocalInterface.BreakConnectionException()
* }
* }
* // Now create a server to accept incoming UDPs on our port:
* val server = KiloServer(cli, acceptUdpDevice(port)) {
* // This initializes new session for each incoming command
* Session("unknown")
* }
* ```
*
* See [connectUdpDevice] for the client sample.
*
* When it is necessary to stop listening to some port, use [UdpServer] instead.
*
* @param port port to listen
* @param localInterface string form local interface to listen
* @param maxInactivityTimeout maximum silence time after which the connection is supposed to be lost.
* the module automatically issues pings on inactivity when there is no data often enough
* to maintain the connection open.
*/
fun acceptUdpDevice(
port: Int,
localInterface: String = "0.0.0.0",
maxInactivityTimeout: Duration = 2.minutes,
): Flow<InetTransportDevice> =
UdpServer(port, localInterface,maxInactivityTimeout).transportFlow
/**
* Connect to UDP server (see [acceptUdpDevice] or [UdpServer]) and return a [InetTransportDevice] for it. It
* should be used with [KiloClient] as connection provider:
* ```kotlin
* val client = KiloClient<Unit>() {
* connect { connectUdpDevice("localhost:$port") }
* }
* // now we can execute remote commands:
* assertEquals("start", client.call(cmdLoad))
* ```
*
* @param hostPort "host:port" string address of the remote UDP port to connect to
* @param maxInactivityTimeout maximum silence time after which the connection is supposed to be lost.
* the module automatically issues pings on inactivity when there is no data often enough
* to maintain the connection open.
*/
fun connectUdpDevice(
hostPort: String,
maxInactivityTimeout: Duration = 2.minutes,
) = connectUdpDevice(hostPort.toNetworkAddress(), maxInactivityTimeout)
/**
* Connect to UDP server (see [acceptUdpDevice]) and return a [InetTransportDevice] for it. It
* should be used with [KiloClient] as connection provider:
* ```kotlin
* val client = KiloClient<Unit>() {
* connect { connectUdpDevice("localhost:$port") }
* }
* // now we can execute remote commands:
* assertEquals("start", client.call(cmdLoad))
* ```
* @param addr the network address where to connect to
* @param maxInactivityTimeout maximum silence time after which the connection is supposed to be lost.
* the module automatically issues pings on inactivity when there is no data often enough
* to maintain the connection open.
*/
fun connectUdpDevice(
addr: NetworkAddress,
maxInactivityTimeout: Duration = 2.minutes,
): InetTransportDevice {
val selectorManager = SelectorManager(Dispatchers.IO)
val remoteAddress = InetSocketAddress(addr.host, addr.port)
val socket = aSocket(selectorManager).udp().connect(remoteAddress)
val done = CompletableDeferred<Unit>()
val transport = UdpSocketTransport(object : UdpConnector {
override suspend fun sendBlock(block: UdpBlock, toAddress: SocketAddress) {
socket.send(block.toDatagram(remoteAddress))
}
override suspend fun disconnectClient(address: SocketAddress) {
done.complete(Unit)
}
}, remoteAddress, false, maxInactivityTimeout)
globalLaunch {
launch {
while (isActive) {
try {
transport.processIncoming(UdpBlock.decode(socket.receive()))
} catch (_: CancellationException) {
break
} catch (e: Exception) {
transport.close()
break
}
}
}
done.await()
}
return transport.transportDevice
}
@@ -0,0 +1,127 @@
package net.sergeych.kiloparsec.adapter
import io.ktor.network.selector.*
import io.ktor.network.sockets.*
import io.ktor.utils.io.*
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.IO
import kotlinx.coroutines.channels.ClosedReceiveChannelException
import kotlinx.coroutines.flow.flow
import kotlinx.coroutines.sync.Mutex
import kotlinx.coroutines.sync.withLock
import net.sergeych.kiloparsec.KiloServer
import net.sergeych.mp_logger.LogTag
import net.sergeych.mp_logger.Loggable
import net.sergeych.mp_logger.debug
import net.sergeych.mp_logger.exception
import kotlin.time.Duration
import kotlin.time.Duration.Companion.minutes
/**
* UDP server for kiloparsec. Unlike [acceptUdpDevice], it allow stopping listening
* to the port when need with [close]. Use [transportFlow] with [KiloServer], here is the
* basic sample:
*
* ```kotlin
* val uServer = UdpServer(port)
* KiloServer(cli, uServer.transportFlow()) {
* Session("unknown")
* }
*
* // server is now active and accepts connections
* // ...
*
* // close and stop listening to the port:
* uServer.close()
* ```
*
* See [acceptUdpDevice] for more information.
*
* @param port port to listen to
* @param localInterface string form of local interface to listen to
* @param maxInactivityTimeout maximum silence time after which the connection is supposed to be lost.
* the module automatically issues pings on inactivity when there is no data often enough
* to maintain the connection open.
*/
class UdpServer(val port: Int, localInterface: String = "0.0.0.0", maxInactivityTimeout: Duration = 2.minutes) :
Loggable by LogTag("UDPS${udpCounter.incrementAndGet()}"), UdpConnector {
private val sessions = mutableMapOf<SocketAddress, UdpSocketTransport>()
private val access = Mutex()
private val selectorManager = SelectorManager(Dispatchers.IO)
private val serverSocket = aSocket(selectorManager).udp().bind(InetSocketAddress(localInterface, port))
override suspend fun disconnectClient(address: SocketAddress) {
access.withLock { sessions.remove(address) }
}
/**
* a transport flow of [InetTransportDevice] suitable to be used with [KiloServer], see [UdpServer] for the
* usage sample.
*/
val transportFlow by lazy {
flow {
while (true) {
try {
val datagram = serverSocket.receive()
val block = UdpBlock.decode(datagram)
val remoteAddress = datagram.address
access.withLock {
if (block == UdpBlock.Cancel) {
// if the cancel comes to already closed transport, do nothing
sessions.remove(remoteAddress)?.processIncoming(block)
} else {
sessions.getOrPut(remoteAddress) {
// new connection: create transport
debug { "Creating new connection to $remoteAddress" }
UdpSocketTransport(this@UdpServer, remoteAddress, true, maxInactivityTimeout)
// and emit it:
.also { emit(it.transportDevice) }
}.processIncoming(block)
}
}
} catch (_: CancellationException) {
break
} catch (_: ClosedReceiveChannelException) {
break
} catch (e: Exception) {
exception { "unexpected exception in incoming datagram processing" to e }
close()
break
}
}
}
}
override suspend fun sendBlock(block: UdpBlock, toAddress: SocketAddress) {
serverSocket.send(block.toDatagram(toAddress))
}
val isClosed: Boolean get() = serverSocket.isClosed
/**
* Close the UDP server. Calling it will cause:
*
* - Closing nound UDP socket on [port]
* - Closing all pending connections
* - cancelling the [transportFlow], which will cause Kiloparsec server to also stop
*
* Call suspends until socket and all sessions are closed. Later calls do nothing.
*/
suspend fun close() {
access.withLock {
if (!isClosed) {
runCatching { serverSocket.close() }
}
}
while (sessions.isNotEmpty()) {
runCatching {
access.withLock { sessions.values.firstOrNull() }
?.close()
}
}
}
}
@@ -0,0 +1,179 @@
package net.sergeych.kiloparsec.adapter
import io.ktor.network.sockets.*
import io.ktor.utils.io.*
import kotlinx.coroutines.channels.BufferOverflow
import kotlinx.coroutines.channels.Channel
import kotlinx.coroutines.channels.ClosedReceiveChannelException
import kotlinx.coroutines.channels.ClosedSendChannelException
import kotlinx.coroutines.coroutineScope
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch
import kotlinx.datetime.Clock
import net.sergeych.kiloparsec.SyncValue
import net.sergeych.mp_logger.Log
import net.sergeych.mp_logger.Loggable
import net.sergeych.mp_logger.debug
import net.sergeych.mp_logger.exception
import net.sergeych.mp_tools.globalLaunch
import kotlin.time.Duration
/**
* This is a common part of UDP transport shared between client and server connections.
* It should not be used directly but bu the [UdpServer], [acceptUdpDevice] and [connectUdpDevice]
* respectively.
*/
internal class UdpSocketTransport(
private val server: UdpConnector,
val socketAddress: SocketAddress,
val isServer: Boolean,
val maxInactivityTimeout: Duration
) :
Loggable {
// IMPORTANT! Log stuff must be the first (or you shot your leg):
val address = (socketAddress as InetSocketAddress).let { NetworkAddress(it.hostname, it.port) }
override var logTag: String = "UDPT:$address${if (isServer) ":server" else ":client"}"
override var logLevel: Log.Level? = Log.Level.DEBUG
// Pinger params: keep them first!
private var lastSendAt = Clock.System.now()
private var lastReceived = Clock.System.now()
private val pingTimeout = maxInactivityTimeout / 3
private val pingSleep = pingTimeout / 3
private val pingMinTimeout = pingTimeout * 2 / 3
val inputDataBlocks = Channel<UByteArray>(256, onBufferOverflow = BufferOverflow.DROP_OLDEST)
val outputDataBlocks = Channel<UByteArray>(256, onBufferOverflow = BufferOverflow.DROP_OLDEST)
val inputUdpBlocks = Channel<UdpBlock>(256, onBufferOverflow = BufferOverflow.DROP_OLDEST)
private val job = globalLaunch {
coroutineScope {
launch { convertOutput() }
launch { convertInput() }
launch { pinger() }
}
}
init {
// This is iverly important: it requires that
// all members are initialized before use. Otherwise kotlin
// may execute class members pr
debug { "initialization done" }
}
val transportDevice: InetTransportDevice by lazy {
InetTransportDevice(inputDataBlocks, outputDataBlocks, address, { close() }, {})
}
private val closedFlag = SyncValue(false)
val isClosed: Boolean = closedFlag.value
suspend fun close() {
closedFlag.mutate {
if (!it) {
runCatching { server.sendBlock(UdpBlock.Cancel, socketAddress) }
server.disconnectClient(socketAddress)
runCatching { inputDataBlocks.close() }
runCatching { outputDataBlocks.close() }
job.cancel()
}
true
}
}
private suspend fun send(block: UdpBlock) {
server.sendBlock(block, socketAddress)
lastSendAt = Clock.System.now()
}
/**
* Process the block recoded by the server. Note that it should properly process all
* block types, e.g. close on [UdpBlock.Cancel], etc. Server will not close us!
*
* __Important: it should not block, instead, server expects it to return ASAP__, so it
* executes in a local coroutine context.
*
* Also it should not throw exceptions.
*/
fun processIncoming(block: UdpBlock) {
inputUdpBlocks.trySend(block)
}
suspend fun convertInput() {
while(!isClosed) {
when (val block = inputUdpBlocks.receiveCatching().getOrNull()) {
null -> break
is UdpBlock.Cancel -> globalLaunch {
debug { "received cancel block, requesting close" }
kotlin.runCatching { close() }
}
is UdpBlock.Data -> {
// input does not block, it uses DROP_OLDEST policy
lastReceived = Clock.System.now()
val result = kotlin.runCatching { inputDataBlocks.send(block.data) }
when (val e = result.exceptionOrNull()) {
null -> {}
is ClosedSendChannelException -> {
debug { "received close channel" }
close()
}
is CancellationException -> {}
else -> {
exception { "unexpected exception" to e }
close()
}
}
}
UdpBlock.Ping -> {
lastReceived = Clock.System.now()
if (lastSendAt - lastReceived > pingMinTimeout) send(UdpBlock.Ping)
}
}
}
}
private suspend fun pinger() {
while (!isClosed) {
delay(pingSleep)
val inactivity = Clock.System.now() - lastSendAt
if( inactivity > maxInactivityTimeout) {
debug { "inactivity timout: closing the connection" }
close()
}
if (inactivity >= pingTimeout) {
debug { "pinger sends a ping on timeout" }
send(UdpBlock.Ping)
}
}
}
private suspend fun convertOutput() {
while (!isClosed) {
try {
server.sendBlock(UdpBlock.Data(outputDataBlocks.receive()), socketAddress)
} catch (e: CancellationException) {
// this is ok
break
} catch (e: ClosedReceiveChannelException) {
debug { "input channel is closed, closing" }
close()
break
} catch (e: Exception) {
exception { "unexpected exception in convertOutput" to e }
close()
break
}
}
debug { "exiting convertOutput" }
}
}
-69
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@@ -1,69 +0,0 @@
import kotlinx.coroutines.test.runTest
import net.sergeych.crypto2.initCrypto
import net.sergeych.kiloparsec.*
import net.sergeych.kiloparsec.adapter.acceptTcpDevice
import net.sergeych.kiloparsec.adapter.connectTcpDevice
import kotlin.random.Random
import kotlin.test.Test
import kotlin.test.assertEquals
import kotlin.test.assertIs
class TcpTest {
class TestException : Exception("test1")
@Test
fun tcpTest() = runTest {
initCrypto()
// Log.connectConsole(Log.Level.DEBUG)
data class Session(
var data: String,
)
val port = 27170 + Random.nextInt(1, 200)
val cmdSave by command<String, Unit>()
val cmdLoad by command<Unit, String>()
val cmdDrop by command<Unit, Unit>()
val cmdException by command<Unit, Unit>()
val cli = KiloInterface<Session>().apply {
registerError { TestException() }
onConnected { session.data = "start" }
on(cmdSave) { session.data = it }
on(cmdLoad) {
session.data
}
on(cmdException) {
throw TestException()
}
on(cmdDrop) {
throw LocalInterface.BreakConnectionException()
}
}
val server = KiloServer(cli, acceptTcpDevice(port)) {
Session("unknown")
}
val client = KiloClient<Unit>() {
addErrors(cli)
// TODO: add register error variant
connect { connectTcpDevice("localhost:$port") }
}
assertEquals("start", client.call(cmdLoad))
client.call(cmdSave, "foobar")
assertEquals("foobar", client.call(cmdLoad))
val res = kotlin.runCatching { client.call(cmdException) }
assertIs<TestException>(res.exceptionOrNull())
assertEquals("foobar", client.call(cmdLoad))
assertThrows<RemoteInterface.ClosedException> { client.call(cmdDrop) }
// reconnect?
assertEquals("start", client.call(cmdLoad))
server.close()
}
}
@@ -0,0 +1,192 @@
package net.sergeych.kiloparsec.adapter
import assertThrows
import kotlinx.coroutines.test.runTest
import net.sergeych.crypto2.initCrypto
import net.sergeych.kiloparsec.*
import net.sergeych.mp_logger.Log
import kotlin.random.Random
import kotlin.test.Test
import kotlin.test.assertEquals
import kotlin.test.assertIs
class InternetrTest {
class TestException : Exception("test1")
@Test
fun tcpTest() = runTest {
initCrypto()
Log.connectConsole(Log.Level.DEBUG)
data class Session(
var data: String,
)
val port = 27170 + Random.nextInt(1, 200)
val cmdSave by command<String, Unit>()
val cmdLoad by command<Unit, String>()
val cmdDrop by command<Unit, Unit>()
val cmdException by command<Unit, Unit>()
val cli = KiloInterface<Session>().apply {
registerError { TestException() }
onConnected { session.data = "start" }
on(cmdSave) { session.data = it }
on(cmdLoad) {
session.data
}
on(cmdException) {
throw TestException()
}
on(cmdDrop) {
throw LocalInterface.BreakConnectionException()
}
}
val server = KiloServer(cli, acceptTcpDevice(port)) {
Session("unknown")
}
val client = KiloClient<Unit>() {
addErrors(cli)
// TODO: add register error variant
connect { connectTcpDevice("localhost:$port") }
}
assertEquals("start", client.call(cmdLoad))
client.call(cmdSave, "foobar")
assertEquals("foobar", client.call(cmdLoad))
val res = kotlin.runCatching { client.call(cmdException) }
assertIs<TestException>(res.exceptionOrNull())
assertEquals("foobar", client.call(cmdLoad))
assertThrows<RemoteInterface.ClosedException> { client.call(cmdDrop) }
// reconnect?
assertEquals("start", client.call(cmdLoad))
server.close()
}
@Test
fun udpTest() = runTest {
initCrypto()
Log.connectConsole(Log.Level.DEBUG)
data class Session(
var data: String,
)
val port = 27170 + Random.nextInt(1, 200)
val cmdSave by command<String, Unit>()
val cmdLoad by command<Unit, String>()
val cmdDrop by command<Unit, Unit>()
val cmdException by command<Unit, Unit>()
val cli = KiloInterface<Session>().apply {
registerError { TestException() }
onConnected { session.data = "start" }
on(cmdSave) { session.data = it }
on(cmdLoad) {
session.data
}
on(cmdException) {
throw TestException()
}
on(cmdDrop) {
throw LocalInterface.BreakConnectionException()
}
}
val server = KiloServer(cli, acceptUdpDevice(port)) {
Session("unknown")
}
val client = KiloClient<Unit>() {
addErrors(cli)
connect { connectUdpDevice("127.0.0.1:$port") }
}
assertEquals("start", client.call(cmdLoad))
client.call(cmdSave, "foobar")
assertEquals("foobar", client.call(cmdLoad))
val res = kotlin.runCatching { client.call(cmdException) }
assertIs<TestException>(res.exceptionOrNull())
assertEquals("foobar", client.call(cmdLoad))
assertThrows<RemoteInterface.ClosedException> { client.call(cmdDrop) }
// reconnect?
assertEquals("start", client.call(cmdLoad))
server.close()
}
@Test
fun udpServerTest() = runTest {
initCrypto()
Log.connectConsole(Log.Level.DEBUG)
data class Session(
var data: String,
)
val port = 27170 + Random.nextInt(1, 900)
val cmdSave by command<String, Unit>()
val cmdLoad by command<Unit, String>()
val cmdDrop by command<Unit, Unit>()
val cmdException by command<Unit, Unit>()
val cli = KiloInterface<Session>().apply {
registerError { TestException() }
onConnected { session.data = "start" }
on(cmdSave) { session.data = it }
on(cmdLoad) {
session.data
}
on(cmdException) {
throw TestException()
}
on(cmdDrop) {
throw LocalInterface.BreakConnectionException()
}
}
val uServer = UdpServer(port)
KiloServer(cli, uServer.transportFlow) {
Session("unknown")
}
// second server
KiloServer(cli,acceptUdpDevice(uServer.port+1)) { Session("unknown2") }
val client = KiloClient<Unit>() {
addErrors(cli)
connect { connectUdpDevice("127.0.0.1:$port") }
}
val client2 = KiloClient<Unit>() { connect { connectUdpDevice("127.0.0.1:${port+1}") } }
assertEquals("start", client.call(cmdLoad))
assertEquals("start", client2.call(cmdLoad))
client.call(cmdSave, "foobar")
client2.call(cmdSave, "buzz")
assertEquals("foobar", client.call(cmdLoad))
assertEquals("buzz", client2.call(cmdLoad))
val res = kotlin.runCatching { client.call(cmdException) }
assertIs<TestException>(res.exceptionOrNull())
assertEquals("foobar", client.call(cmdLoad))
assertThrows<RemoteInterface.ClosedException> { client.call(cmdDrop) }
// reconnect?
assertEquals("start", client.call(cmdLoad))
uServer.close()
// server.close()
}
}