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blame.go
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blame.go
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// Copyright 2023 Harness, Inc.
//
// 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 git
import (
"context"
"fmt"
"io"
"github.com/harness/gitness/errors"
)
type BlameParams struct {
ReadParams
GitRef string
Path string
// LineFrom allows to restrict the blame output to only lines starting from the provided line number (inclusive).
// Optional, ignored if value is 0.
LineFrom int
// LineTo allows to restrict the blame output to only lines up to the provided line number (inclusive).
// Optional, ignored if value is 0.
LineTo int
}
func (params *BlameParams) Validate() error {
if params == nil {
return ErrNoParamsProvided
}
if err := params.ReadParams.Validate(); err != nil {
return err
}
if params.GitRef == "" {
return errors.InvalidArgument("git ref needs to be provided")
}
if params.Path == "" {
return errors.InvalidArgument("file path needs to be provided")
}
if params.LineFrom < 0 || params.LineTo < 0 {
return errors.InvalidArgument("line from and line to can't be negative")
}
if params.LineTo > 0 && params.LineFrom > params.LineTo {
return errors.InvalidArgument("line from can't be after line after")
}
return nil
}
type BlamePart struct {
Commit *Commit `json:"commit"`
Lines []string `json:"lines"`
}
// Blame processes and streams the git blame output data.
// The function returns two channels: The data channel and the error channel.
// If any error happens during the operation it will be put to the error channel
// and the streaming will stop. Maximum of one error can be put on the channel.
func (s *Service) Blame(ctx context.Context, params *BlameParams) (<-chan *BlamePart, <-chan error) {
ch := make(chan *BlamePart)
chErr := make(chan error, 1)
go func() {
defer close(ch)
defer close(chErr)
if err := params.Validate(); err != nil {
chErr <- err
return
}
repoPath := getFullPathForRepo(s.reposRoot, params.RepoUID)
reader := s.git.Blame(ctx,
repoPath, params.GitRef, params.Path,
params.LineFrom, params.LineTo)
for {
part, errRead := reader.NextPart()
if part == nil {
return
}
commit, err := mapCommit(part.Commit)
if err != nil {
chErr <- fmt.Errorf("failed to map rpc commit: %w", err)
return
}
lines := make([]string, len(part.Lines))
copy(lines, part.Lines)
ch <- &BlamePart{Commit: commit, Lines: lines}
if errRead != nil && errors.Is(errRead, io.EOF) {
return
}
}
}()
return ch, chErr
}