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feat(examples): add fake-driver-rs scriptable compute driver#2181

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feat(examples): add fake-driver-rs scriptable compute driver#2181
elezar wants to merge 1 commit into
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1950-fake-driver-rs/el

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@elezar

@elezar elezar commented Jul 8, 2026

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Summary

Adds examples/fake-driver-rs, a scriptable out-of-process gRPC compute driver for testing gateway integration and developing conformance tests against the external driver path.

Related Issue

Closes #1950

Changes

  • New fake-driver-rs binary in examples/fake-driver-rs/ (added to workspace)
  • Implements the full ComputeDriver gRPC service over a Unix socket
  • Each RPC is driven by an ordered sequence of scripted responses defined in a TOML config file
  • When a sequence is exhausted, the last entry repeats with a warning logged
  • WatchSandboxes emits scripted events with a configurable delay between each
  • Responds to both SIGTERM and SIGINT for clean shutdown
  • Includes a scenarios/happy-path.toml example scenario covering all RPCs

Testing

  • mise run pre-commit passes
  • Unit tests added/updated
  • E2E tests added/updated (if applicable)

Checklist

  • Follows Conventional Commits
  • Commits are signed off (DCO)

Adds a fake out-of-process compute driver to examples/fake-driver-rs
for testing gateway integration and developing conformance tests.

The driver implements the full ComputeDriver gRPC service over a Unix
socket, with each RPC driven by an ordered sequence of scripted
responses defined in a TOML config file. When a sequence is exhausted
the last entry repeats with a warning logged. Responds to both SIGTERM
and SIGINT for clean shutdown.

Signed-off-by: Evan Lezar <elezar@nvidia.com>
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test: add e2e coverage for external compute driver endpoints

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