com.bazoud.elasticsearch.river.git.flow.FetchRepositoryFunction Maven / Gradle / Ivy

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package com.bazoud.elasticsearch.river.git.flow;

import java.util.Collection;

import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.storage.file.FileRepositoryBuilder;
import org.eclipse.jgit.transport.FetchResult;
import org.eclipse.jgit.transport.TrackingRefUpdate;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.logging.Loggers;

import com.bazoud.elasticsearch.river.git.beans.Context;
import com.bazoud.elasticsearch.river.git.flow.functions.TrackingRefUpdateToRef;
import com.bazoud.elasticsearch.river.git.guava.MyFunction;
import com.bazoud.elasticsearch.river.git.jgit.LoggingProgressMonitor;
import com.google.common.base.Predicate;
import com.google.common.base.Predicates;
import com.google.common.collect.FluentIterable;

import static org.eclipse.jgit.lib.RefUpdate.Result.NO_CHANGE;

/**
 * @author Olivier Bazoud
 */
public class FetchRepositoryFunction extends MyFunction {
    private static ESLogger logger = Loggers.getLogger(FetchRepositoryFunction.class);

    @Override
    public Context doApply(Context context) throws Throwable {
        final Repository repository = new FileRepositoryBuilder()
            .setGitDir(context.getProjectPath())
                // scan environment GIT_* variables
            .readEnvironment()
            .findGitDir()
            .setMustExist(true)
            .build();
        context.setRepository(repository);

        logger.info("Fetching '{}' repository at path: '{}'", context.getName(), context.getProjectPath());

        Git git = new Git(repository);

        FetchResult fetchResult = git.fetch()
            .setProgressMonitor(new LoggingProgressMonitor(logger))
            .call();

        Collection refs = FluentIterable
            .from(fetchResult.getTrackingRefUpdates())
            .filter(Predicates.not(new Predicate() {
                @Override
                public boolean apply(TrackingRefUpdate input) {
                    return NO_CHANGE.equals(input.getResult());
                }
            }))
            .transform(new TrackingRefUpdateToRef(repository))
            .toList();

        context.setRefs(refs);
        logger.info("Found {} refs to process.", refs.size());
        return context;
    }
}