ruby-half.dang

"""
The SDK module's Ruby half, lib/ruby_sdk.rb, run in an exec: the request on stdin, objects by ID, the module's own source by ID, the result in a file.
"""
type RubyHalf {
  """
  The starter of a new module, as the SDK's setting gives it.
  """
  pub template: String!

  """
  The Ruby of a new module, as the SDK's setting gives it.
  """
  pub rubyVersion: String!

  """
  Run one function of the Ruby half, its arguments as JSON with objects by ID; its result as JSON.
  """
  pub call(fnName: String!, fnArgs: String!): String! {
    let request = JSON.encode({{
      template: template,
      rubyVersion: rubyVersion,
      function: fnName,
      args: fnArgs,
      moduleSource: currentModule.source.id,
    }})
    runtime
      .withExec(["ruby", "-rbundler/setup", "lib/ruby_sdk/call.rb", "/dagger/result.json"], stdin: request)
      .file("/dagger/result.json")
      .contents
  }

  # The gems install from the Gemfiles and gemspecs alone, by content, before
  # the rest of the source arrives. Not frozen: after an edit to the Gemfile,
  # this install relocks in the container, so that dagger generate still runs
  # and relocks the scope for good.
  let runtime: Container! {
    let source = currentModule.source
    let dependencies = [
      "Gemfile",
      "Gemfile.lock",
      "dagger.gemfile",
      "sdk/dagger-sdk.gemspec",
      "clients/core/dagger-clients-core.gemspec",
      "clients/roots/dagger-clients-roots.gemspec",
    ].reduce(directory) { files, path => files.withNewFile(path, source.file(path).contents) }
    source.directory("images/ruby").dockerBuild
      .withEnvVariable("BUNDLE_GEMFILE", "/src/Gemfile")
      .withEnvVariable("BUNDLE_PATH", "/usr/local/bundle")
      .withEnvVariable("BUNDLE_USER_CACHE", "/cache/bundle/ruby-sdk")
      .withEnvVariable("DAGGER_MODULE", "ruby-sdk")
      .withEnvVariable("DAGGER_MAIN_OBJECT", "RubySdk")
      .withEnvVariable("DAGGER_MODULE_FILE", "lib/ruby_sdk.rb")
      .withMountedCache("/cache/bundle", cacheVolume("ruby-sdk-bundle"))
      .withWorkdir("/src")
      .withDirectory("/src", dependencies)
      .withExec(["bundle", "install"])
      .withDirectory("/src", source)
  }
}