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EnvoyInterceptor.kt
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EnvoyInterceptor.kt
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/*
* Copyright (C) 2021 Square, Inc.
*
* 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:OptIn(ExperimentalCoroutinesApi::class)
package okhttp.android.envoy
import io.envoyproxy.envoymobile.Engine
import io.envoyproxy.envoymobile.RequestHeadersBuilder
import io.envoyproxy.envoymobile.RequestMethod
import io.envoyproxy.envoymobile.StreamPrototype
import java.io.IOException
import java.nio.ByteBuffer
import java.util.concurrent.Executors
import kotlin.coroutines.cancellation.CancellationException
import kotlin.coroutines.resumeWithException
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.ExperimentalCoroutinesApi
import kotlinx.coroutines.runBlocking
import kotlinx.coroutines.suspendCancellableCoroutine
import okhttp3.Headers
import okhttp3.Interceptor
import okhttp3.MediaType
import okhttp3.MediaType.Companion.toMediaTypeOrNull
import okhttp3.Protocol
import okhttp3.Request
import okhttp3.Response
import okhttp3.ResponseBody.Companion.asResponseBody
import okio.Buffer
import okio.Pipe
import okio.buffer
class EnvoyInterceptor(val engine: Engine) : Interceptor {
override fun intercept(chain: Interceptor.Chain): Response {
return runBlocking(Dispatchers.IO) {
makeRequest(engine, chain.request())
}
}
}
@ExperimentalCoroutinesApi
suspend fun makeRequest(engine: Engine, request: Request) =
suspendCancellableCoroutine<Response> { continuation ->
val responseBuilder = Response.Builder()
.request(request)
.sentRequestAtMillis(System.currentTimeMillis())
val bodyPipe = Pipe(1024L * 1024L)
val bodySink = bodyPipe.sink.buffer()
val bodySource = bodyPipe.source.buffer()
var contentType: MediaType?
val streamPrototype: StreamPrototype = engine
.streamClient()
.newStreamPrototype()
.setOnResponseHeaders { responseHeaders, endStream, streamIntel ->
val headers = responseHeaders.toHeaders()
contentType = headers["content-type"]?.toMediaTypeOrNull()
// TODO check this logic
val alpn = headers["x-envoy-upstream-alpn"]
val protocol = if (alpn != null) {
Protocol.get(alpn)
} else {
if (request.isHttps) Protocol.QUIC else Protocol.HTTP_1_1
}
responseBuilder
.protocol(protocol)
.code(responseHeaders.httpStatus ?: 0)
.message(responseHeaders.httpStatus.toString())
.receivedResponseAtMillis(System.currentTimeMillis())
.headers(headers)
if (!endStream) {
responseBuilder.body(bodySource.asResponseBody(contentType, -1))
}
continuation.resume(responseBuilder.build(), onCancellation = {})
}
.setOnResponseTrailers { responseTrailers, streamIntel ->
println("Dropping trailers " + responseTrailers.toHeaders())
}
.setOnResponseData { data, endStream, streamIntel ->
if (endStream) {
bodySink.close()
}
}
.setOnComplete { streamIntel, finalStreamIntel ->
bodySink.close()
}
.setOnError { error, streamIntel, finalStreamIntel ->
// TODO how to signal error correctly?
bodySource.close()
continuation.resumeWithException(
IOException(
"${error.errorCode}: ${error.message}",
error.cause
)
)
}
.setOnCancel { streamIntel, finalStreamIntel ->
continuation.cancel(CancellationException("underlying connection was cancelled"))
}
val body = request.body
val requestHeaders = RequestHeadersBuilder(
request.envoyMethod,
if (request.isHttps) "https" else "http",
request.url.host,
request.url.encodedPath
).apply {
// TODO addH2RawDomains for Protocol.H2C?
request.headers.toMultimap().forEach { (name, values) ->
values.forEach { value ->
add(name, value)
}
}
}
val stream = if (body != null) {
val requestBodyType = body.contentType()
if (requestBodyType != null) {
requestHeaders.add("Content-Type", requestBodyType.toString())
}
val stream = streamPrototype
.start(Executors.newSingleThreadExecutor())
.sendHeaders(requestHeaders.build(), endStream = false)
// TODO loop in chunks
val buffer = Buffer()
body.writeTo(buffer)
stream.close(ByteBuffer.wrap(buffer.readByteArray()))
stream
} else {
streamPrototype
.start(Executors.newSingleThreadExecutor())
.sendHeaders(requestHeaders.build(), endStream = true)
}
continuation.invokeOnCancellation {
stream.cancel()
}
}
private fun io.envoyproxy.envoymobile.Headers.toHeaders(): Headers {
val builder = Headers.Builder()
allHeaders().forEach { (key, values) ->
values.forEach { value ->
builder.add(key, value)
}
}
return builder.build()
}
private val Request.envoyMethod: RequestMethod
get() {
@Suppress("BlockingMethodInNonBlockingContext")
return when (this.method) {
"GET" -> RequestMethod.GET
"POST" -> RequestMethod.POST
"PUT" -> RequestMethod.PUT
"DELETE" -> RequestMethod.DELETE
else -> throw IllegalArgumentException("Unsupported method $method")
}
}