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| 1 | +/* |
| 2 | + * Copyright 2015-2024 the original author or authors. |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + * you may not use this file except in compliance with the License. |
| 6 | + * You may obtain a copy of the License at |
| 7 | + * |
| 8 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | + * |
| 10 | + * Unless required by applicable law or agreed to in writing, software |
| 11 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + * See the License for the specific language governing permissions and |
| 14 | + * limitations under the License. |
| 15 | + */ |
| 16 | + |
| 17 | +package io.rsocket.kotlin.transport.ktor.websocket.client |
| 18 | + |
| 19 | +import io.ktor.client.* |
| 20 | +import io.ktor.client.engine.* |
| 21 | +import io.ktor.client.plugins.websocket.* |
| 22 | +import io.ktor.client.request.* |
| 23 | +import io.ktor.http.* |
| 24 | +import io.rsocket.kotlin.internal.io.* |
| 25 | +import io.rsocket.kotlin.transport.* |
| 26 | +import io.rsocket.kotlin.transport.ktor.websocket.internal.* |
| 27 | +import kotlinx.coroutines.* |
| 28 | +import kotlin.coroutines.* |
| 29 | + |
| 30 | +public sealed interface KtorWebSocketClientTransport : RSocketTransport { |
| 31 | + public fun target(request: HttpRequestBuilder.() -> Unit): RSocketClientTarget |
| 32 | + public fun target(urlString: String, request: HttpRequestBuilder.() -> Unit = {}): RSocketClientTarget |
| 33 | + |
| 34 | + public fun target( |
| 35 | + method: HttpMethod = HttpMethod.Get, |
| 36 | + host: String? = null, |
| 37 | + port: Int? = null, |
| 38 | + path: String? = null, |
| 39 | + request: HttpRequestBuilder.() -> Unit = {}, |
| 40 | + ): RSocketClientTarget |
| 41 | + |
| 42 | + public companion object Factory : |
| 43 | + RSocketTransportFactory<KtorWebSocketClientTransport, KtorWebSocketClientTransportBuilder>(::KtorWebSocketClientTransportBuilderImpl) |
| 44 | +} |
| 45 | + |
| 46 | +public sealed interface KtorWebSocketClientTransportBuilder : RSocketTransportBuilder<KtorWebSocketClientTransport> { |
| 47 | + public fun httpEngine(configure: HttpClientEngineConfig.() -> Unit) |
| 48 | + public fun httpEngine(engine: HttpClientEngine, configure: HttpClientEngineConfig.() -> Unit = {}) |
| 49 | + public fun <T : HttpClientEngineConfig> httpEngine(factory: HttpClientEngineFactory<T>, configure: T.() -> Unit = {}) |
| 50 | + |
| 51 | + public fun webSocketsConfig(block: WebSockets.Config.() -> Unit) |
| 52 | +} |
| 53 | + |
| 54 | +private class KtorWebSocketClientTransportBuilderImpl : KtorWebSocketClientTransportBuilder { |
| 55 | + private var httpClientFactory: HttpClientFactory = HttpClientFactory.Default |
| 56 | + private var webSocketsConfig: WebSockets.Config.() -> Unit = {} |
| 57 | + |
| 58 | + override fun httpEngine(configure: HttpClientEngineConfig.() -> Unit) { |
| 59 | + this.httpClientFactory = HttpClientFactory.FromConfiguration(configure) |
| 60 | + } |
| 61 | + |
| 62 | + override fun httpEngine(engine: HttpClientEngine, configure: HttpClientEngineConfig.() -> Unit) { |
| 63 | + this.httpClientFactory = HttpClientFactory.FromEngine(engine, configure) |
| 64 | + } |
| 65 | + |
| 66 | + override fun <T : HttpClientEngineConfig> httpEngine(factory: HttpClientEngineFactory<T>, configure: T.() -> Unit) { |
| 67 | + this.httpClientFactory = HttpClientFactory.FromFactory(factory, configure) |
| 68 | + } |
| 69 | + |
| 70 | + override fun webSocketsConfig(block: WebSockets.Config.() -> Unit) { |
| 71 | + this.webSocketsConfig = block |
| 72 | + } |
| 73 | + |
| 74 | + @RSocketTransportApi |
| 75 | + override fun buildTransport(context: CoroutineContext): KtorWebSocketClientTransport { |
| 76 | + val httpClient = httpClientFactory.createHttpClient { |
| 77 | + install(WebSockets, webSocketsConfig) |
| 78 | + } |
| 79 | + // only dispatcher of a client is used - it looks like it's Dispatchers.IO now |
| 80 | + val newContext = context.supervisorContext() + (httpClient.coroutineContext[ContinuationInterceptor] ?: EmptyCoroutineContext) |
| 81 | + val newJob = newContext.job |
| 82 | + val httpClientJob = httpClient.coroutineContext.job |
| 83 | + |
| 84 | + httpClientJob.invokeOnCompletion { newJob.cancel("HttpClient closed", it) } |
| 85 | + newJob.invokeOnCompletion { httpClientJob.cancel("KtorWebSocketClientTransport closed", it) } |
| 86 | + |
| 87 | + return KtorWebSocketClientTransportImpl( |
| 88 | + coroutineContext = newContext, |
| 89 | + httpClient = httpClient, |
| 90 | + ) |
| 91 | + } |
| 92 | +} |
| 93 | + |
| 94 | +private class KtorWebSocketClientTransportImpl( |
| 95 | + override val coroutineContext: CoroutineContext, |
| 96 | + private val httpClient: HttpClient, |
| 97 | +) : KtorWebSocketClientTransport { |
| 98 | + override fun target(request: HttpRequestBuilder.() -> Unit): RSocketClientTarget = KtorWebSocketClientTargetImpl( |
| 99 | + coroutineContext = coroutineContext, |
| 100 | + httpClient = httpClient, |
| 101 | + request = request |
| 102 | + ) |
| 103 | + |
| 104 | + override fun target( |
| 105 | + urlString: String, |
| 106 | + request: HttpRequestBuilder.() -> Unit, |
| 107 | + ): RSocketClientTarget = target( |
| 108 | + method = HttpMethod.Get, host = null, port = null, path = null, |
| 109 | + request = { |
| 110 | + url.protocol = URLProtocol.WS |
| 111 | + url.port = port |
| 112 | + |
| 113 | + url.takeFrom(urlString) |
| 114 | + request() |
| 115 | + }, |
| 116 | + ) |
| 117 | + |
| 118 | + override fun target( |
| 119 | + method: HttpMethod, |
| 120 | + host: String?, |
| 121 | + port: Int?, |
| 122 | + path: String?, |
| 123 | + request: HttpRequestBuilder.() -> Unit, |
| 124 | + ): RSocketClientTarget = target { |
| 125 | + this.method = method |
| 126 | + url("ws", host, port, path) |
| 127 | + request() |
| 128 | + } |
| 129 | +} |
| 130 | + |
| 131 | +private class KtorWebSocketClientTargetImpl( |
| 132 | + override val coroutineContext: CoroutineContext, |
| 133 | + private val httpClient: HttpClient, |
| 134 | + private val request: HttpRequestBuilder.() -> Unit, |
| 135 | +) : RSocketClientTarget { |
| 136 | + |
| 137 | + @RSocketTransportApi |
| 138 | + override fun connectClient(handler: RSocketConnectionHandler): Job = launch { |
| 139 | + httpClient.webSocket(request) { |
| 140 | + handler.handleKtorWebSocketConnection(this) |
| 141 | + } |
| 142 | + } |
| 143 | +} |
| 144 | + |
| 145 | +private sealed class HttpClientFactory { |
| 146 | + abstract fun createHttpClient(block: HttpClientConfig<*>.() -> Unit): HttpClient |
| 147 | + |
| 148 | + object Default : HttpClientFactory() { |
| 149 | + override fun createHttpClient(block: HttpClientConfig<*>.() -> Unit): HttpClient = HttpClient(block) |
| 150 | + } |
| 151 | + |
| 152 | + class FromConfiguration( |
| 153 | + private val configure: HttpClientEngineConfig.() -> Unit, |
| 154 | + ) : HttpClientFactory() { |
| 155 | + override fun createHttpClient(block: HttpClientConfig<*>.() -> Unit): HttpClient = HttpClient { |
| 156 | + engine(configure) |
| 157 | + block() |
| 158 | + } |
| 159 | + } |
| 160 | + |
| 161 | + class FromEngine( |
| 162 | + private val engine: HttpClientEngine, |
| 163 | + private val configure: HttpClientEngineConfig.() -> Unit, |
| 164 | + ) : HttpClientFactory() { |
| 165 | + override fun createHttpClient(block: HttpClientConfig<*>.() -> Unit): HttpClient = HttpClient(engine) { |
| 166 | + engine(configure) |
| 167 | + block() |
| 168 | + } |
| 169 | + } |
| 170 | + |
| 171 | + class FromFactory<T : HttpClientEngineConfig>( |
| 172 | + private val factory: HttpClientEngineFactory<T>, |
| 173 | + private val configure: T.() -> Unit, |
| 174 | + ) : HttpClientFactory() { |
| 175 | + override fun createHttpClient(block: HttpClientConfig<*>.() -> Unit): HttpClient = HttpClient(factory) { |
| 176 | + engine(configure) |
| 177 | + block() |
| 178 | + } |
| 179 | + } |
| 180 | +} |
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