tvl-depot/tvix/nar-bridge/pkg/server/util.go
Florian Klink 0ecd10bf30 feat(tvix/nar-bridge): init
This provides a Nix HTTP Binary Cache interface in front of a tvix-store
that's reachable via gRPC.

TODOs:

 - remove import command, move serve up to toplevel. We have nix-copy-
   closure and tvix-store commands.
 - loop into CI. We should be able to fetch the protos as a third-party
   dependency.
 - Check if we can test nar-bridge slightly easier in an integration
   test.
 - Ensure we support connecting to unix sockets and grpc+http at least,
   using the same syntax as tvix-store.
 - Don't buffer the entire blob when rendering NAR

Co-Authored-By: Connor Brewster <cbrewster@hey.com>
Co-Authored-By: Márton Boros <martonboros@gmail.com>
Co-Authored-By: Vo Minh Thu <noteed@gmail.com>

Change-Id: I6064474e49dfe78cea67676957462d9f28658d4a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9339
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
2023-09-17 13:24:53 +00:00

24 lines
702 B
Go

package server
import (
"fmt"
nixhash "github.com/nix-community/go-nix/pkg/hash"
)
// parseNarHashFromUrl parses a nixbase32 string representing a sha256 NarHash
// and returns a nixhash.Hash when it was able to parse, or an error.
func parseNarHashFromUrl(narHashFromUrl string) (*nixhash.Hash, error) {
// peek at the length. If it's 52 characters, assume sha256,
// if it's something else, this is an error.
l := len(narHashFromUrl)
if l != 52 {
return nil, fmt.Errorf("invalid length of narHash: %v", l)
}
nixHash, err := nixhash.ParseNixBase32("sha256:" + narHashFromUrl)
if err != nil {
return nil, fmt.Errorf("unable to parse nixbase32 hash: %w", err)
}
return nixHash, nil
}