golang-context

Propagate context cancellation and deadlines across Go HTTP handlers by passing r.Context() through service calls and database queries. Use context-aware APIs like QueryContext to ensure work stops cleanly when the request is aborted or times out.

Store request-scoped data in Golang context using unexported keys. Avoid storing the context itself inside structs; instead, pass it explicitly as the first parameter to functions to maintain clean cancellation chains and traceability.

Cancel database queries in Go by passing the request context to context-aware variants like QueryContext or ExecContext. This ensures the underlying database driver aborts the query automatically when the parent context deadline is exceeded or canceled.

Run background work after a Go context is canceled using advanced patterns like context.WithoutCancel and context.AfterFunc. These allow you to detach new background operations from the parent request's cancellation signal while preserving request-scoped tracing data.

Avoid storing Go context in a struct because it breaks the explicit propagation chain required for reliable cancellation and deadlines. Passing context as the first function argument ensures all downstream service calls and HTTP requests respect timeout boundaries.

This Skill covers idiomatic context patterns for microservices by applying context.Context across HTTP handlers, outbound service calls, and database queries. It enforces best practices for unexported keys and proper cleanup to ensure traceable and cancellable work.