Add support to follow containers logs with DockerComposeContainer

[mfuksa]

When using DockerComposeContainer I would like to follow output logs from my containers that are started by DockerComposeContainer.

Maybe there is a way how to do it but I have not found it. Using DockerComposeContainer#followOutput(...)does not do that.
Thanks.

[rnorth]

Hi Miroslav,

Yes, that feature doesn't exist yet. I'm currently doing quite a bit of
rework on docker compose support (#156) so I think it would make sense to
add this when that's all resolved - it should be easier then, as well.

I hope this is ok!
Thanks

Richard
On Wed, 15 Jun 2016 at 20:48, Miroslav Fuksa notifications@github.com
wrote:

When using DockerComposeContainer I would like to follow output logs from
my containers that are started by DockerComposeContainer.

Maybe there is a way how to do it but I have not found it. Using
DockerComposeContainer#followOutput(...)does not do that.
Thanks.

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Richard

[mfuksa]

Hi Richard,

no problem. I appreciate if it could be added (even later). I can access the logs other ways, so it's fine for me as a workaround.

Thanks a lot
Miroslav

[pcornish]

@mfuksa @rnorth

Something like this in DockerComposeContainer.createServices() might do it:

// tail child container logs
dockerClient.listContainersCmd()
        .withShowAll(true)
        .exec().stream()
        .filter(container -> Arrays.stream(container.getNames()).anyMatch(name -> name.startsWith("/" + identifier)))
        .forEach(container -> followOutput(
                container.getId(),
                new Slf4jLogConsumer(logger()).withPrefix(container.getNames()[0]),
                OutputFrame.OutputType.STDOUT, OutputFrame.OutputType.STDERR)
        );

// ...then

private void followOutput(String containerId, Consumer<OutputFrame> consumer, OutputFrame.OutputType... types) {
    LogContainerCmd cmd = dockerClient.logContainerCmd(containerId)
            .withFollowStream(true);

    FrameConsumerResultCallback callback = new FrameConsumerResultCallback();
    for (OutputFrame.OutputType type : types) {
        callback.addConsumer(type, consumer);
        if (type == STDOUT) cmd.withStdOut(true);
        if (type == STDERR) cmd.withStdErr(true);
    }

    cmd.exec(callback);
}

There are obvious DRY opportunities here, as this followOutput method is copy-pasta'd from GenericContainer, for illustrative purposes.

[outofcoffee]

@rnorth we can probably close this now #233 has been merged.

[rnorth]

Yep - released in 1.1.7 so will close.