org.rapidoid.http.client.HttpClientProtocol Maven / Gradle / Ivy
/*-
* #%L
* rapidoid-http-client
* %%
* Copyright (C) 2014 - 2018 Nikolche Mihajlovski and contributors
* %%
* 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.
* #L%
*/
package org.rapidoid.http.client;
import org.rapidoid.annotation.Authors;
import org.rapidoid.annotation.Since;
import org.rapidoid.buffer.Buf;
import org.rapidoid.data.BufRange;
import org.rapidoid.data.BufRanges;
import org.rapidoid.net.abstracts.Channel;
import org.rapidoid.net.impl.FiniteStateProtocol;
import org.rapidoid.u.U;
import org.rapidoid.util.Msc;
import java.util.Map;
@Authors("Nikolche Mihajlovski")
@Since("5.5.0")
public class HttpClientProtocol extends FiniteStateProtocol {
private final String request;
private final HttpClientCallback callback;
public HttpClientProtocol(String request, HttpClientCallback callback) {
super(2);
this.request = request;
this.callback = callback;
}
/*
* Send request.
*/
@Override
protected int state0(Channel ctx) {
ctx.log("sending request");
ctx.write(request.getBytes());
return 1;
}
/*
* Receive response.
*/
@Override
protected int state1(Channel ctx) {
ctx.log("receiving response");
final BufRanges head = ctx.helper().ranges1.reset();
final BufRanges body = ctx.helper().ranges2.reset();
Buf in = ctx.input();
in.scanLnLn(head);
Map headers = head.toMap(in.bytes(), 1, head.count - 1, "\\s*\\:\\s*");
Map headersLow = Msc.lowercase(headers);
if ("chunked".equals(headersLow.get("transfer-encoding"))) {
ctx.log("got chunked encoding");
parseChunkedBody(in, body);
callback.onResult(in, head, body);
} else if (headersLow.containsKey("content-length")) {
ctx.log("got content length");
int clength = Integer.parseInt(headersLow.get("content-length"));
parseBodyByContentLength(in, body, clength);
callback.onResult(in, head, body);
} else {
// no content length is provided, read until connection is closed
ctx.log("read until closed");
readBodyUntilClosed(ctx, body);
callback.onResult(in, head, body);
}
ctx.log("done");
ctx.close(); // improve: keep-alive
return STOP;
}
private void parseChunkedBody(Buf in, BufRanges chunks) {
int count;
do {
String cnt = in.readLn();
count = Integer.parseInt(cnt, 16);
if (count > 0) {
BufRange chunk = chunks.ranges[chunks.add()];
in.scanN(count, chunk);
// each chunk is terminated with a new line
String line = in.readLn();
U.must(line.isEmpty());
}
} while (count > 0);
}
private void parseBodyByContentLength(Buf in, BufRanges body, int clength) {
body.add(); // there will be only 1 body part
in.scanN(clength, body.ranges[0]);
}
private void readBodyUntilClosed(Channel ctx, BufRanges body) {
ctx.waitUntilClosing();
body.add(); // there will be only 1 body part
Buf in = ctx.input();
in.scanN(in.remaining(), body.ranges[0]);
}
}