feat: add Caplin (Erigon embedded CL) as a supported consensus launcher#1339
Merged
barnabasbusa merged 10 commits intomainfrom Mar 26, 2026
Merged
feat: add Caplin (Erigon embedded CL) as a supported consensus launcher#1339barnabasbusa merged 10 commits intomainfrom
barnabasbusa merged 10 commits intomainfrom
Conversation
Caplin is Erigon's embedded consensus layer client that runs as a standalone binary connecting to an Erigon EL node via the Engine API. This adds it as a supported cl_type in ethereum-package. Closes #1337 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Add caplin-basic.yaml test with erigon+caplin and geth+lighthouse participants. Add caplin to erigon-all.yaml to test alongside other CL clients. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
6 tasks
Fix caplin launcher flags based on actual caplin --help output: - --execution.addr -> --engine.api + --engine.api.host/port - --execution.jwtSecret -> --engine.api.jwtsecret - --beacon.api takes endpoint list, not boolean - --beacon-cfg -> --custom-config - --genesis-ssz -> --custom-genesis-state - --checkpoint-sync-url -> --caplin.checkpoint-sync-url - Add User(uid=0, gid=0) for /data directory permissions - Use pprof for metrics endpoint Add caplin participant to mix-with-tools.yaml (per-PR CI), mix-with-tools-minimal.yaml, and mix.yaml test configs. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
parithosh
approved these changes
Mar 26, 2026
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Summary
caplinas a new supportedcl_typefor running Erigon's embedded consensus layer clientcaplin) from the same Docker image as Erigon, connecting via Engine API with JWT authvc_typedefaults tolighthousewhen not specifiedUsage example
Changes
src/package_io/constants.star: AddedcaplintoCL_TYPEsrc/package_io/input_parser.star: Added default images, VC type defaults to lighthouse for caplinsrc/cl/caplin/caplin_launcher.star: New launcher following existing patterns (consensoor/lighthouse)src/cl/cl_launcher.star: Registered caplin in the dispatcherCloses #1337
Test plan
kurtosis run . --args-filewith a config usingcl_type: caplinandel_type: erigon🤖 Generated with Claude Code