internal/pkg: cache computed identifiers

This eliminates duplicate identifier computations. The new implementation also significantly reduces allocations while computing identifier for a large dependency tree.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/pkg/net.go

@@ -50,9 +50,11 @@ func NewHTTPGet(
 // Kind returns the hardcoded [Kind] constant.
 func (a *httpArtifact) Kind() Kind { return KindHTTPGet }
 
-// Params returns the backing url string. Context is not represented as it does
+// Params writes the backing url string. Client is not represented as it does
 // not affect [Cache.Cure] outcome.
-func (a *httpArtifact) Params() []byte { return []byte(a.url) }
+func (a *httpArtifact) Params(ctx *IContext) {
+	ctx.GetHash().Write([]byte(a.url))
+}
 
 // Dependencies returns a nil slice.
 func (a *httpArtifact) Dependencies() []Artifact { return nil }