init

internal/cas/mesh_fetcher.go

@@ -0,0 +1,50 @@
+package cas
+
+import (
+	"io"
+	"net/http"
+	"strings"
+
+	"git.send.nrw/sendnrw/decent-websrv/internal/mesh"
+	"git.send.nrw/sendnrw/decent-websrv/internal/security"
+)
+
+type MeshFetcher struct {
+	Ring     *mesh.Rendezvous
+	HTTP     *http.Client
+	Verifier *security.MeshVerifier
+	Self     mesh.NodeInfo
+}
+
+func (f *MeshFetcher) FetchTo(hash string, w http.ResponseWriter) bool {
+	owners := f.Ring.Owners(hash, 3)
+	if len(owners) == 0 {
+		return false
+	}
+	for _, id := range owners {
+		if id == f.Self.NodeID {
+			continue
+		}
+		// resolve id to node
+		// In this minimal starter we assume Mesh URL can be derived externally; in a fuller impl, pass a Catalog here.
+		// For simplicity, try owner as URL directly if it's already a URL; otherwise skip.
+		u := id // If your ring holds IDs, you should map ID->Node (MeshURL); keep simple here.
+		if !strings.HasPrefix(u, "http") {
+			continue
+		}
+		path := "/_mesh/cas/" + hash
+		req, _ := http.NewRequest(http.MethodGet, strings.TrimRight(u, "/")+path, nil)
+		f.Verifier.SignOutgoing(req, "", f.Self.NodeID) // sign GET with empty body-hash
+		resp, err := f.HTTP.Do(req)
+		if err != nil {
+			continue
+		}
+		if resp.StatusCode == 200 {
+			defer resp.Body.Close()
+			io.Copy(w, resp.Body)
+			return true
+		}
+		resp.Body.Close()
+	}
+	return false
+}