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OkHttpSkraperClient.kt
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OkHttpSkraperClient.kt
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/*
* Copyright (c) 2019-present Mikhael Sokolov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
@file:Suppress(
"EXPERIMENTAL_API_USAGE",
"BlockingMethodInNonBlockingContext"
)
package ru.sokomishalov.skraper.client.okhttp
import kotlinx.coroutines.Dispatchers.IO
import kotlinx.coroutines.suspendCancellableCoroutine
import kotlinx.coroutines.withContext
import okhttp3.*
import okhttp3.MediaType.Companion.toMediaType
import okio.Buffer
import okio.BufferedSink
import okio.buffer
import okio.sink
import ru.sokomishalov.skraper.client.HttpRequest
import ru.sokomishalov.skraper.client.HttpResponse
import ru.sokomishalov.skraper.client.SkraperClient
import ru.sokomishalov.skraper.internal.consts.DEFAULT_CONNECTION_TIMEOUT
import ru.sokomishalov.skraper.internal.consts.DEFAULT_READ_TIMEOUT
import java.io.File
import java.io.IOException
import kotlin.coroutines.resume
import kotlin.coroutines.resumeWithException
/**
* Huge appreciation to my russian colleague
* @see <a href="https://github.com/gildor/kotlin-coroutines-okhttp/blob/master/src/main/kotlin/ru/gildor/coroutines/okhttp/CallAwait.kt">CallAwait.kt</a>
*
* @author sokomishalov
*/
class OkHttpSkraperClient(
private val client: OkHttpClient = DEFAULT_CLIENT
) : SkraperClient {
override suspend fun request(request: HttpRequest): HttpResponse {
return client
.newCall(request.prepareCall())
.await()
.let {
HttpResponse(
status = it.code,
headers = it.headers.toMap(),
body = withContext(IO) { it.body?.bytes() }
)
}
}
override suspend fun download(request: HttpRequest, destFile: File) {
val response = client
.newCall(request.prepareCall())
.await()
withContext(IO) {
destFile.sink().buffer().use { sink ->
response.body?.source()?.use { source ->
val sinkBuffer: Buffer = sink.buffer
val bufferSize = 8 * 1024
while (source.read(sinkBuffer, bufferSize.toLong()) != -1L) sink.emit()
sink.flush()
}
}
}
}
private fun HttpRequest.prepareCall(): Request {
return Request
.Builder()
.url(url)
.headers(Headers.headersOf(*(headers.flatMap { (k, v) -> listOf(k, v) }.toTypedArray())))
.method(
method = method.name,
body = body?.createRequest(contentType = headers["Content-Type"])
)
.build()
}
private suspend fun Call.await(): Response {
return suspendCancellableCoroutine { continuation ->
enqueue(object : Callback {
override fun onResponse(call: Call, response: Response) = continuation.resume(response)
override fun onFailure(call: Call, e: IOException) = if (continuation.isCancelled.not()) continuation.resumeWithException(e) else Unit
})
continuation.invokeOnCancellation {
runCatching { cancel() }
}
}
}
private fun ByteArray.createRequest(contentType: String?): RequestBody {
return object : RequestBody() {
override fun contentType(): MediaType? = contentType?.toMediaType()
override fun contentLength(): Long = [email protected]()
override fun writeTo(sink: BufferedSink) = sink.write(this@createRequest).run { }
}
}
companion object {
@JvmStatic
val DEFAULT_CLIENT: OkHttpClient = OkHttpClient
.Builder()
.followRedirects(true)
.followSslRedirects(true)
.connectTimeout(DEFAULT_CONNECTION_TIMEOUT)
.readTimeout(DEFAULT_READ_TIMEOUT)
.build()
}
}