InternalFetchConnection.java

/*
 * Copyright (C) 2015, Google Inc. and others
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0 which is available at
 * https://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package org.eclipse.jgit.transport;

import java.io.IOException;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;

import org.eclipse.jgit.errors.TransportException;
import org.eclipse.jgit.internal.JGitText;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.transport.resolver.ServiceNotAuthorizedException;
import org.eclipse.jgit.transport.resolver.ServiceNotEnabledException;
import org.eclipse.jgit.transport.resolver.UploadPackFactory;

class InternalFetchConnection<C> extends BasePackFetchConnection {
    private Thread worker;

    /**
     * Constructor for InternalFetchConnection.
     *
     * @param transport
     *            a {@link org.eclipse.jgit.transport.PackTransport}
     * @param uploadPackFactory
     *            a
     *            {@link org.eclipse.jgit.transport.resolver.UploadPackFactory}
     * @param req
     *            request
     * @param remote
     *            the remote {@link org.eclipse.jgit.lib.Repository}
     * @throws org.eclipse.jgit.errors.TransportException
     *             if any.
     */
    public InternalFetchConnection(PackTransport transport,
            final UploadPackFactory<C> uploadPackFactory,
            final C req, final Repository remote) throws TransportException {
        super(transport);

        final PipedInputStream in_r;
        final PipedOutputStream in_w;

        final PipedInputStream out_r;
        final PipedOutputStream out_w;
        try {
            in_r = new PipedInputStream();
            in_w = new PipedOutputStream(in_r);

            out_r = new PipedInputStream() {
                // The client (BasePackFetchConnection) can write
                // a huge burst before it reads again. We need to
                // force the buffer to be big enough, otherwise it
                // will deadlock both threads.
                {
                    buffer = new byte[MIN_CLIENT_BUFFER];
                }
            };
            out_w = new PipedOutputStream(out_r);
        } catch (IOException err) {
            remote.close();
            throw new TransportException(uri, JGitText.get().cannotConnectPipes, err);
        }

        worker = new Thread("JGit-Upload-Pack") { //$NON-NLS-1$
            @Override
            public void run() {
                try {
                    final UploadPack rp = uploadPackFactory.create(req, remote);
                    rp.upload(out_r, in_w, null);
                } catch (ServiceNotEnabledException
                        | ServiceNotAuthorizedException e) {
                    // Ignored. Client cannot use this repository.
                } catch (IOException | RuntimeException err) {
                    // Client side of the pipes should report the problem.
                    err.printStackTrace();
                } finally {
                    try {
                        out_r.close();
                    } catch (IOException e2) {
                        // Ignore close failure, we probably crashed above.
                    }

                    try {
                        in_w.close();
                    } catch (IOException e2) {
                        // Ignore close failure, we probably crashed above.
                    }

                    remote.close();
                }
            }
        };
        worker.start();

        init(in_r, out_w);
        readAdvertisedRefs();
    }

    /** {@inheritDoc} */
    @Override
    public void close() {
        super.close();

        try {
            if (worker != null) {
                worker.join();
            }
        } catch (InterruptedException ie) {
            // Stop waiting and return anyway.
        } finally {
            worker = null;
        }
    }
}