com.lithium.flow.shell.sshj.SshjExec.java Source code

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Here is the source code for com.lithium.flow.shell.sshj.SshjExec.java

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/*
 * Copyright 2015 Lithium Technologies, 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.
 */

package com.lithium.flow.shell.sshj;

import static com.google.common.base.Charsets.UTF_8;
import static com.google.common.base.Preconditions.checkNotNull;
import static net.schmizz.sshj.connection.channel.direct.Session.Command;

import com.lithium.flow.io.InputStreamSpliterator;
import com.lithium.flow.shell.Exec;

import java.io.IOException;
import java.util.Optional;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;

import javax.annotation.Nonnull;

import org.apache.commons.io.IOUtils;

import net.schmizz.sshj.connection.channel.direct.Session;

/**
 * @author Matt Ayres
 */
public class SshjExec implements Exec {
    private final Command command;
    private final boolean pty;

    public SshjExec(@Nonnull Sshj ssh, @Nonnull String command) throws IOException {
        checkNotNull(ssh);
        checkNotNull(command);

        Session session = ssh.startSession();
        pty = ssh.isPty();
        if (pty) {
            session.allocateDefaultPTY();
        }

        this.command = session.exec(command);
    }

    @Override
    @Nonnull
    public Stream<String> out() {
        return StreamSupport.stream(new InputStreamSpliterator(command.getInputStream(), UTF_8), false);
    }

    @Override
    @Nonnull
    public Stream<String> err() {
        return StreamSupport.stream(new InputStreamSpliterator(command.getErrorStream(), UTF_8), false);
    }

    @Override
    @Nonnull
    public Optional<Integer> exit() throws IOException {
        out().count();
        err().count();
        Integer status = command.getExitStatus();
        close();
        return Optional.ofNullable(status);
    }

    @Override
    public void close() throws IOException {
        if (pty) {
            command.close();
        } else {
            IOUtils.closeQuietly(command.getOutputStream());
            IOUtils.closeQuietly(command.getInputStream());
            IOUtils.closeQuietly(command.getErrorStream());
        }
    }
}