| // Copyright 2022 The LUCI Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| // Package graph contains methods to explore reachable invocations. |
| package graph |
| |
| import ( |
| "crypto/sha256" |
| "encoding/hex" |
| |
| "go.chromium.org/luci/resultdb/pbutil" |
| pb "go.chromium.org/luci/resultdb/proto/v1" |
| ) |
| |
| // SourceHash stores a 12 byte hash of sources, as raw bytes. |
| // To display, use the String() method. |
| type SourceHash string |
| |
| const ( |
| EmptySourceHash SourceHash = "" |
| ) |
| |
| func (h SourceHash) String() string { |
| return hex.EncodeToString([]byte(h)) |
| } |
| |
| // HashSources returns a hash of the given code sources proto, |
| // which can be used as a key in maps. |
| func HashSources(s *pb.Sources) SourceHash { |
| h := sha256.New() |
| b := pbutil.MustMarshal(s) |
| _, err := h.Write(b) |
| if err != nil { |
| panic(err) |
| } |
| return SourceHash(string(h.Sum(nil)[:12])) |
| } |