wsr

engine

Workflow execution engine. Orchestrates job scheduling, expression evaluation, step dispatch, and result propagation.

responsibilities

• Build the job DAG from needs: declarations
• Expand matrix strategies into concrete job instances
• Evaluate $ expressions via the expression engine
• Dispatch each step to the sandbox
• Propagate outputs: between jobs
• Collect exit codes and surface failures to git

expression engine

Evaluates GitHub Actions expression syntax: $.

supported contexts

context	fields
github.*	event_name, ref, sha, actor, repository
env.*	job and step level env vars
runner.*	os, arch, temp, tool_cache
secrets.*	injected from secrets_from file

supported functions

type	functions
string	contains, startsWith, endsWith, format
JSON	fromJSON, toJSON
status	success(), failure(), always(), cancelled()

job dag

Jobs are sorted topologically by their needs: graph. Independent jobs run in parallel; dependent jobs wait for their predecessors to complete and expose their outputs:.

source

• src/engine/mod.rs

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