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package se.rupy.http;
import java.io.File;
import java.io.FileInputStream;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Set;
/**
* High speed HTTP async NIO client.<br>
* <br>
* This exists because Apache HAC:<br>
* <br>
* - Can't handle Murphy's law.<br>
* - Rarely blocks forever stuck in sun.misc.Unsafe.park().<br>
* - Is pretty slow and big (adds ~20-30 ms. and 1.5 MB).<br>
*/
public class Async implements Runnable {
private static final int SIZE = 1024;
private boolean alive = true, debug;
private int timeout;
private CopyOnWriteArrayList calls;
private Selector selector;
private Daemon daemon;
private Queue queue;
protected Async() {
calls = new CopyOnWriteArrayList();
timeout = 1000;
debug = true;
}
protected Async(Daemon daemon, int timeout, boolean debug) {
calls = new CopyOnWriteArrayList();
this.timeout = timeout;
this.daemon = daemon;
this.debug = debug;
}
public boolean debug() {
debug = !debug;
return debug;
}
/**
* This is your Async callback.
*/
public static abstract class Work {
protected Event event;
protected Deploy.Archive archive;
public Work(Event event) throws Exception {
this.event = event;
try {
archive = (Deploy.Archive) Thread.currentThread().getContextClassLoader();
}
catch(Exception e) {
// On standalone (non hosted) this might fail.
}
}
/**
* POST or GET small data with {@link Async.Call#post(String, String, byte[])} and {@link Async.Call#get(String, String)}, POST large data with {@link Async.Call#post(String, String, File)}.
*/
public abstract void send(Call call) throws Exception;
/**
* Will probably return String headers and byte[] body at some point.
*/
public abstract void read(String host, String body) throws Exception;
/**
* If this happens with {@link Async.Timeout}, just resend.
* Exceptions you might see here:
* ClosedChannel and
* Connect
*/
public abstract void fail(String host, Exception e) throws Exception;
}
/**
* Thrown when {@link SocketChannel#read(ByteBuffer)} returns -1.
*/
public static class Timeout extends Exception {
String host;
public Timeout(String host) {
this.host = host;
}
public String getMessage() {
return host;
}
}
/**
* More workers are only important on multi-core processors.
*/
protected void start(int workers) throws Exception {
selector = Selector.open();
queue = new Queue(workers);
new Thread(this, "Async-Poll").start();
}
/**
* Send work to some host.
* If you are using fuse, throw the event immediately after to avoid async cascades.
* @param invalidate the number of seconds after which the channel is regarded as unreliable.
*/
public synchronized void send(String host, Work work, int invalidate) throws Exception {
// Fixes FUSE "opened output without flush" cascade.
//if(work.event != null && work.event.reply().output.init)
// work.event.reply().output.flush();
if(invalidate > 0) {
Iterator it = calls.iterator();
while(it.hasNext()) {
Call call = (Call) it.next();
if(call.work == null && call.host.equals(host) && call.invalidate == invalidate && !remove(call)) {
if(debug)
call.print(" -->");
call.work = work;
call.state(Call.WRITE);
selector.wakeup();
return;
}
}
}
Call call = new Call(this, work, host, invalidate);
call.state(Call.CONNECT);
calls.add(call);
selector.wakeup();
if(debug)
call.print("open");
}
/**
* This has little effect, the class leaks threads and selectors
* on hot-deploy. We will incorporate this class with the rupy
* server as soon as it is feature complete to avoid this issue.
*/
protected void stop() throws Exception {
alive = false;
selector.wakeup();
calls.clear();
queue.stop();
}
/**
* Holds the channel and buffer.
*/
public class Call implements Runnable {
private static final int CONNECT = SelectionKey.OP_CONNECT;
private static final int WRITE = SelectionKey.OP_WRITE;
private static final int READ = SelectionKey.OP_READ;
/*
* This is crucial, since NIO has a tendency to not play well with
* Murphy's law, you need to analyze your practical cluster behavior.
*
* For me there was a grey zone between the channel.read() returning -1
* and the socket throwing connection timeout; where the selector would
* not select read keys for some reason.
*/
private int invalidate;
private int state, run;
private Async async;
private Work work;
private String host, cookie, version;
private SocketChannel channel;
private long time;
private boolean running;
private Call(Async async, Work work, String host, int invalidate) {
this.invalidate = invalidate;
this.async = async;
this.work = work;
this.host = host;
time = System.currentTimeMillis();
}
/* This was a nice try but the spec. says you can also just close the connection
* after the response has finished instead of providing a content-length header
* so this will only work well on some web servers.
* I even tried setting Connection: keep-alive but Apache ignores it and serves a
* HTTP/1.0 response without Content-Length or Transfer-Encoding with Connection: close
* The HTTP spec is not async. to async. friendly.
*/
public void version() {
this.version = "HTTP/1.0";
}
private void state(int state) {
this.state = state;
}
private int state() {
return state;
}
private void select() throws Exception {
if(state == Call.CONNECT)
connect(selector);
if(state == Call.WRITE)
write(selector);
if(state == Call.READ)
read(selector);
}
private void connect(Selector selector) throws Exception {
int colon = this.host.indexOf(':');
String host = colon > 0 ? this.host.substring(0, colon) : this.host;
int port = colon > 0 ? Short.parseShort(this.host.substring(colon + 1, this.host.length())) : 80;
if(debug)
System.out.println(" connect " + host + " " + port);
state = 0;
channel = SocketChannel.open();
channel.configureBlocking(false);
channel.socket().setTcpNoDelay(true);
channel.socket().setSoTimeout(timeout);
channel.connect(new InetSocketAddress(InetAddress.getByName(host), port));
channel.register(selector, SelectionKey.OP_CONNECT, this);
time = System.currentTimeMillis();
}
private void write(Selector selector) throws Exception {
state = 0;
channel.register(selector, SelectionKey.OP_WRITE, this);
time = System.currentTimeMillis();
}
private void read(Selector selector) throws Exception {
state = 0;
channel.register(selector, SelectionKey.OP_READ, this);
time = System.currentTimeMillis();
}
/**
* Headers should be \r\n separated, but no trailing \r\n.
*/
public void get(String path, String headers) throws Exception {
write("GET", path, headers, null);
}
/**
* Headers should be \r\n separated, but no trailing \r\n.
*/
public void post(String path, String headers, byte[] body) throws Exception {
write("POST", path, headers, body);
}
/**
* Headers should be \r\n separated, but no trailing \r\n.
*/
public void post(String path, String headers, File file) throws Exception {
write(path, headers, file);
}
private void write(String method, String path, String headers, byte[] body) throws Exception {
String http = method + " " + path + " " + version + "\r\n" +
(body == null ? "" : "Content-Length: " + body.length + "\r\n") +
(cookie == null ? "" : "Cookie: " + cookie + "\r\n") +
(version.equals("HTTP/1.0") ? "Connection: keep-alive\r\n" : "") +
headers +
"\r\n\r\n";
if(debug)
System.out.println(" request " + http);
byte[] head = http.getBytes("utf-8");
long length, write;
if(body == null) {
length = head.length;
write = channel.write(ByteBuffer.wrap(head));
}
else {
byte[] data = new byte[head.length + body.length];
System.arraycopy(head, 0, data, 0, head.length);
System.arraycopy(body, 0, data, head.length, body.length);
if(debug) {
System.out.println(" head " + head.length);
System.out.println(" body " + body.length);
System.out.println(" data " + new String(data));
}
length = data.length;
write = channel.write(ByteBuffer.wrap(data));
}
if(debug)
System.out.println(" write " + write + " " + length);
if(write != length) {
throw new Exception("Data too long?");
}
}
private void write(String path, String headers, File file) throws Exception {
String http = "POST " + path + " " + version + "\r\n" +
(file == null ? "" : "Content-Length: " + file.length() + "\r\n") +
(cookie == null ? "" : "Cookie: " + cookie + "\r\n") +
headers +
"\r\n\r\n";
byte[] head = http.getBytes("utf-8");
long length, sent = 0, write = 0;
write = channel.write(ByteBuffer.wrap(head));
length = file.length();
FileChannel out = new FileInputStream(file).getChannel();
try {
while(sent < length) {
sent += out.transferTo(sent, 1024, channel);
}
}
catch(Exception e) {
e.printStackTrace();
}
finally {
out.close();
}
}
/*
* Only one chunk supported.
*/
private String read() throws Exception {
ByteBuffer buffer = ByteBuffer.allocate(SIZE);
byte[] data = new byte[SIZE];
byte[] body = null;
int read = channel.read(buffer), full = 0, zero = 0;
String length = null;
String head = null;
if(debug)
System.out.println(" read " + read);
try {
while(read > -1) {
buffer.rewind();
buffer.get(data, 0, read);
if(body == null) {
head = new String(data, "utf-8");
if(debug)
System.out.println(" head " + head);
int boundary = head.indexOf("\r\n\r\n");
if(boundary == -1)
throw new Exception("Boundary not found.");
boundary += 4;
if(cookie == null) {
cookie = header(head, "Set-Cookie:");
if(cookie != null)
cookie = cookie.substring(0, cookie.indexOf(";"));
//System.out.println("COOKIE " + cookie);
}
length = header(head, "Content-Length:");
int size = 0, part = 0;
if(length == null) {
String hex = head.substring(boundary, head.indexOf("\r\n", boundary));
boundary += hex.length() + 2;
size = Integer.parseInt(hex, 16);
part = size;
}
else {
size = Integer.parseInt(length);
part = read - boundary;
}
body = new byte[size];
System.arraycopy(data, boundary, body, 0, part);
full += part;
}
else if(length != null) {
System.arraycopy(data, 0, body, full, read);
full += read;
}
if(length == null) {
if(find(data)) {
String text = new String(body, "utf-8");
if(head.startsWith(version + " 500"))
throw new Exception(text);
else
return text.trim();
}
}
else if(full == body.length) {
String text = new String(body, "utf-8");
if(head.startsWith(version + " 500"))
throw new Exception(text);
else
return text.trim();
}
buffer.clear();
read = channel.read(buffer);
while(read == 0) {
read(selector);
selector.wakeup();
read = channel.read(buffer);
if(read == 0) {
zero++;
Thread.currentThread().sleep(zero * 20);
if(zero > 10)
throw new Exception("Pipe broken.");
}
}
if(debug)
System.out.println(" read " + read);
}
}
catch(Exception e) {
System.out.println(head);
throw e;
}
if(read == -1) {
throw new Timeout(host);
}
return null;
}
private boolean find(byte[] data) {
for(int i = 0; i < data.length - 5; i++) {
if(data[i] == '0' && data[i + 1] == '\r' && data[i + 2] == '\n' && data[i + 3] == '\r' && data[i + 4] == '\n')
return true;
}
return false;
}
private String header(String head, String name) {
int index = head.indexOf(name);
if(index == -1)
return null;
return head.substring(index + name.length(), head.indexOf("\r\n", index)).trim();
}
public void run() {
try {
if(daemon != null && daemon.host) {
if(work == null || work.archive == null) {
return;
}
}
else if(work == null) {
return;
}
if(run == CONNECT) {
channel.finishConnect();
state(Call.WRITE);
async.wakeup();
}
if(run == WRITE) {
if(daemon != null && daemon.host) {
final Call call = this;
//Deploy.Archive archive = daemon.archive(work.event.host(), true);
Thread.currentThread().setContextClassLoader(work.archive);
AccessController.doPrivileged(new PrivilegedExceptionAction() {
public Object run() throws Exception {
try {
call.version = "HTTP/1.1";
work.send(call);
}
catch(Throwable t) {
Exception e = new Exception(host);
e.initCause(t);
throw e;
}
return null;
}
}, work.archive.access());
}
else {
version = "HTTP/1.1";
work.send(this);
}
state(Call.READ);
async.wakeup();
}
if(run == READ) {
if(daemon != null && daemon.host) {
//Deploy.Archive archive = daemon.archive(work.event.host(), true);
Thread.currentThread().setContextClassLoader(work.archive);
AccessController.doPrivileged(new PrivilegedExceptionAction() {
public Object run() throws Exception {
try {
work.read(host, read());
}
catch(Timeout t) {
throw t;
}
catch(Throwable t) {
Exception e = new Exception(host);
e.initCause(t);
throw e;
}
return null;
}
}, work.archive.access());
}
else {
work.read(host, read());
}
//remove(this);
work = null;
}
}
catch(PrivilegedActionException e) {
try {
failure(e.getException());
}
catch(Exception ex) {
e.printStackTrace();
ex.printStackTrace();
}
}
catch(Exception e) {
try {
failure(e);
}
catch(Exception ex) {
e.printStackTrace();
ex.printStackTrace();
}
}
}
private void failure(Exception e) throws Exception {
//async.remove(this);
if(work != null) {
if(daemon != null && daemon.host) {
final Exception ex = e;
//Deploy.Archive archive = daemon.archive(work.event.host(), true);
Thread.currentThread().setContextClassLoader(work.archive);
AccessController.doPrivileged(new PrivilegedExceptionAction() {
public Object run() throws Exception {
try {
work.fail(host, ex);
}
catch(Throwable t) {
t.printStackTrace();
}
return null;
}
}, work.archive.access());
}
else {
work.fail(host, e);
}
}
else {
e.printStackTrace();
}
}
private boolean invalidate() {
return time + invalidate * 1000 < System.currentTimeMillis();
}
private void print(String pre) {
System.out.println(pre + " [" + host + "][" + invalidate + "][" + cookie + "]");
}
}
private class Queue {
private final Worker[] threads;
private final LinkedList queue;
private Queue(int length) {
queue = new LinkedList();
threads = new Worker[length];
for(int i = 0; i < threads.length; i++) {
threads[i] = new Worker(i);
threads[i].start();
}
}
private void execute(Call call) {
if(!call.running)
synchronized(queue) {
call.running = true;
queue.addLast(call);
queue.notify();
}
}
private void stop() {
for(int i = 0; i < threads.length; i++) {
threads[i].interrupt();
}
}
private class Worker extends Thread {
public Worker(int id) {
super("Async-" + id);
}
public void run() {
Call call;
while(alive) {
synchronized(queue) {
while (queue.isEmpty()) {
try {
queue.wait();
}
catch (InterruptedException e) {
if(!alive)
return;
}
}
call = (Call) queue.removeFirst();
}
try {
call.run();
call.running = false;
}
catch(RuntimeException e) {
e.printStackTrace();
}
}
}
}
}
private void wakeup() {
selector.wakeup();
}
private boolean remove(Call call) throws Exception {
if(call.invalidate()) {
try {
call.channel.close();
}
catch(Exception e) {
e.printStackTrace();
}
calls.remove(call);
if(debug)
call.print("kill");
return true;
}
return false;
}
private void select() throws Exception {
Iterator it = calls.iterator();
while(it.hasNext()) {
Call call = (Call) it.next();
try {
call.select();
}
catch(Exception e) {
e.printStackTrace();
it.remove();
}
}
}
public void run() {
while(alive) {
try {
select();
selector.select();
Set set = selector.selectedKeys();
Iterator it = set.iterator();
while(it.hasNext()) {
SelectionKey key = (SelectionKey) it.next();
it.remove();
if(key.isValid()) {
Call call = (Call) key.attachment();
if(key.isConnectable() || key.isReadable() || key.isWritable()) {
call.run = key.interestOps();
key.interestOps(0);
queue.execute(call);
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
if(selector != null) {
try {
selector.close();
}
catch(Exception e) {}
}
}
}
|