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package commitgraph
import (
"fmt"
"time"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/format/commitgraph"
"github.com/go-git/go-git/v5/plumbing/object"
"github.com/go-git/go-git/v5/plumbing/storer"
)
// graphCommitNode is a reduced representation of Commit as presented in the commit
// graph file (commitgraph.Node). It is merely useful as an optimization for walking
// the commit graphs.
//
// graphCommitNode implements the CommitNode interface.
type graphCommitNode struct {
// Hash for the Commit object
hash plumbing.Hash
// Index of the node in the commit graph file
index int
commitData *commitgraph.CommitData
gci *graphCommitNodeIndex
}
// graphCommitNodeIndex is an index that can load CommitNode objects from both the commit
// graph files and the object store.
//
// graphCommitNodeIndex implements the CommitNodeIndex interface
type graphCommitNodeIndex struct {
commitGraph commitgraph.Index
s storer.EncodedObjectStorer
}
// NewGraphCommitNodeIndex returns CommitNodeIndex implementation that uses commit-graph
// files as backing storage and falls back to object storage when necessary
func NewGraphCommitNodeIndex(commitGraph commitgraph.Index, s storer.EncodedObjectStorer) CommitNodeIndex {
return &graphCommitNodeIndex{commitGraph, s}
}
func (gci *graphCommitNodeIndex) Get(hash plumbing.Hash) (CommitNode, error) {
// Check the commit graph first
parentIndex, err := gci.commitGraph.GetIndexByHash(hash)
if err == nil {
parent, err := gci.commitGraph.GetCommitDataByIndex(parentIndex)
if err != nil {
return nil, err
}
return &graphCommitNode{
hash: hash,
index: parentIndex,
commitData: parent,
gci: gci,
}, nil
}
// Fallback to loading full commit object
commit, err := object.GetCommit(gci.s, hash)
if err != nil {
return nil, err
}
return &objectCommitNode{
nodeIndex: gci,
commit: commit,
}, nil
}
func (c *graphCommitNode) ID() plumbing.Hash {
return c.hash
}
func (c *graphCommitNode) Tree() (*object.Tree, error) {
return object.GetTree(c.gci.s, c.commitData.TreeHash)
}
func (c *graphCommitNode) CommitTime() time.Time {
return c.commitData.When
}
func (c *graphCommitNode) NumParents() int {
return len(c.commitData.ParentIndexes)
}
func (c *graphCommitNode) ParentNodes() CommitNodeIter {
return newParentgraphCommitNodeIter(c)
}
func (c *graphCommitNode) ParentNode(i int) (CommitNode, error) {
if i < 0 || i >= len(c.commitData.ParentIndexes) {
return nil, object.ErrParentNotFound
}
parent, err := c.gci.commitGraph.GetCommitDataByIndex(c.commitData.ParentIndexes[i])
if err != nil {
return nil, err
}
return &graphCommitNode{
hash: c.commitData.ParentHashes[i],
index: c.commitData.ParentIndexes[i],
commitData: parent,
gci: c.gci,
}, nil
}
func (c *graphCommitNode) ParentHashes() []plumbing.Hash {
return c.commitData.ParentHashes
}
func (c *graphCommitNode) Generation() uint64 {
// If the commit-graph file was generated with older Git version that
// set the generation to zero for every commit the generation assumption
// is still valid. It is just less useful.
return uint64(c.commitData.Generation)
}
func (c *graphCommitNode) Commit() (*object.Commit, error) {
return object.GetCommit(c.gci.s, c.hash)
}
func (c *graphCommitNode) String() string {
return fmt.Sprintf(
"%s %s\nDate: %s",
plumbing.CommitObject, c.ID(),
c.CommitTime().Format(object.DateFormat),
)
}
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