config

func InjectEnvars ¶

func InjectEnvars(schema *hcl.AST, config *hcl.AST, prefix string, vars map[string]string)

InjectEnvars walks the schema and for each attribute not present in the config, checks for a corresponding environment variable and injects it.

Environment variable names are derived from the path to the attribute: prefix + block names + attr name, joined with "_", uppercased, hyphens replaced with "_". e.g. prefix="CACHEW", path=["scheduler", "concurrency"] -> "CACHEW_SCHEDULER_CONCURRENCY".

func Load ¶

func Load(
	ctx context.Context,
	cr *cache.Registry,
	mr *metadatadb.Registry,
	sr *strategy.Registry,
	ast *hcl.AST,
	mux *http.ServeMux,
	vars map[string]string,
) (http.Handler, metadatadb.Backend, error)

Load HCL configuration and use that to construct the cache backend, and proxy strategies. It returns an http.Handler that wraps mux — any loaded strategies that implement strategy.Interceptor are applied as middleware before ServeMux route matching, so that they can inspect r.RequestURI rather than the path-only r.URL.Path.

func Schema ¶

func Schema[GlobalConfig any](cr *cache.Registry, mr *metadatadb.Registry, sr *strategy.Registry) *hcl.AST

Schema returns the configuration file schema.

func Split ¶

func Split[GlobalConfig any](ast *hcl.AST) (global, providers *hcl.AST)

Split configuration into global config and provider-specific config.

At this point we don't know what config the providers require, so we just pull out the global config and assume everything else is for the providers.