plugin installation is failed in proxy environment

[e-mon]

In the proxy environment plugin loading function does not seem to work.

Caused by: org.eclipse.aether.resolution.ArtifactResolutionException: Could not transfer artifact com.github.szyn:digdag-slack:pom:0.1.2 from/to central (http://central.maven.org/maven2/): Connect to central.maven.org:80 timed out

I tried putting proxy setting in ~/.m2/settings.xml and set environment variables ( http_proxy, https_proxy ) , but it still does not work.

my environment:

openjdk version "1.8.0_162"
OpenJDK Runtime Environment (Zulu 8.27.0.7-linux64) (build 1.8.0_162-b01)
OpenJDK 64-Bit Server VM (Zulu 8.27.0.7-linux64) (build 25.162-b01, mixed mode)

digdag version: 0.9.24

How to set proxy for loading plugin?

[hiroyuki-sato]

Hello, @e-mon

IIUC, Plugin loading does not support Proxy yet.

https://github.com/treasure-data/digdag/blob/master/digdag-core/src/main/java/io/digdag/core/plugin/RemotePluginLoader.java#L49-L50

    private static final List<RemoteRepository> DEFAULT_REPOSITORIES = ImmutableList.copyOf(new RemoteRepository[] {
        new RemoteRepository.Builder("central", "default", "http://central.maven.org/maven2/").build(),
        new RemoteRepository.Builder("jcenter", "default", "http://jcenter.bintray.com/").build(),
    });

The RemoteRepository.Builder needs to set proxy parameter. https://maven.apache.org/resolver/apidocs/org/eclipse/aether/repository/RemoteRepository.Builder.html#setProxy(org.eclipse.aether.repository.Proxy)

[hiroyuki-sato]

I checked current implementation.

• Plugin download
  • Plugin download use RemotePluginLodaer class in digdag-core.
  • RemotePluginLoader use RemoteRepository class in org.eclipse.aether package.
  • RemoteRepository use self Proxy class.
  • Current implementation doesn't set Proxy configuration.
• Proxy configuration management.
  • Proxy configuration management use Proxies class in digdag-standards.

It requires the following consideration to implement the proxy setting for RemotePluginLoader.

• RemoePluginLoader use Proxies class.
  • An idea is move Proxies class to digdag-client package.
  • Or move RemotePluginLoader to digdag-standards. (I'm not sure whether this change possible or not.)
• Modify RemotePluginDownloader for the proxy setting.

This change is rough test implementation.