mirror of
https://github.com/go-gitea/gitea
synced 2025-07-10 12:37:19 +00:00
Use commit graph files for listing pages (#7314)
* Experimental support for git commit graph files and bloom filter index Signed-off-by: Filip Navara <filip.navara@gmail.com> * Force vendor of commitgraph Signed-off-by: Filip Navara <filip.navara@gmail.com> * Remove bloom filter experiment and debug prints * Remove old code for building commit graphs * Remove unused function * Remove mmap usage * gofmt * sort vendor/modules.txt * Add copyright header and log commit-graph error
This commit is contained in:
35
vendor/gopkg.in/src-d/go-git.v4/plumbing/format/commitgraph/commitgraph.go
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35
vendor/gopkg.in/src-d/go-git.v4/plumbing/format/commitgraph/commitgraph.go
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package commitgraph
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import (
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"time"
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"gopkg.in/src-d/go-git.v4/plumbing"
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)
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// CommitData is a reduced representation of Commit as presented in the commit graph
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// file. It is merely useful as an optimization for walking the commit graphs.
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type CommitData struct {
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// TreeHash is the hash of the root tree of the commit.
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TreeHash plumbing.Hash
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// ParentIndexes are the indexes of the parent commits of the commit.
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ParentIndexes []int
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// ParentHashes are the hashes of the parent commits of the commit.
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ParentHashes []plumbing.Hash
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// Generation number is the pre-computed generation in the commit graph
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// or zero if not available
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Generation int
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// When is the timestamp of the commit.
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When time.Time
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}
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// Index represents a representation of commit graph that allows indexed
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// access to the nodes using commit object hash
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type Index interface {
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// GetIndexByHash gets the index in the commit graph from commit hash, if available
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GetIndexByHash(h plumbing.Hash) (int, error)
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// GetNodeByIndex gets the commit node from the commit graph using index
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// obtained from child node, if available
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GetCommitDataByIndex(i int) (*CommitData, error)
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// Hashes returns all the hashes that are available in the index
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Hashes() []plumbing.Hash
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}
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103
vendor/gopkg.in/src-d/go-git.v4/plumbing/format/commitgraph/doc.go
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vendored
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103
vendor/gopkg.in/src-d/go-git.v4/plumbing/format/commitgraph/doc.go
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// Package commitgraph implements encoding and decoding of commit-graph files.
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//
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// Git commit graph format
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// =======================
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//
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// The Git commit graph stores a list of commit OIDs and some associated
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// metadata, including:
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//
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// - The generation number of the commit. Commits with no parents have
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// generation number 1; commits with parents have generation number
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// one more than the maximum generation number of its parents. We
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// reserve zero as special, and can be used to mark a generation
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// number invalid or as "not computed".
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//
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// - The root tree OID.
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//
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// - The commit date.
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//
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// - The parents of the commit, stored using positional references within
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// the graph file.
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//
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// These positional references are stored as unsigned 32-bit integers
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// corresponding to the array position within the list of commit OIDs. Due
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// to some special constants we use to track parents, we can store at most
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// (1 << 30) + (1 << 29) + (1 << 28) - 1 (around 1.8 billion) commits.
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//
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// == Commit graph files have the following format:
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//
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// In order to allow extensions that add extra data to the graph, we organize
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// the body into "chunks" and provide a binary lookup table at the beginning
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// of the body. The header includes certain values, such as number of chunks
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// and hash type.
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//
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// All 4-byte numbers are in network order.
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//
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// HEADER:
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//
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// 4-byte signature:
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// The signature is: {'C', 'G', 'P', 'H'}
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//
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// 1-byte version number:
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// Currently, the only valid version is 1.
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//
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// 1-byte Hash Version (1 = SHA-1)
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// We infer the hash length (H) from this value.
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//
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// 1-byte number (C) of "chunks"
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//
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// 1-byte (reserved for later use)
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// Current clients should ignore this value.
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//
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// CHUNK LOOKUP:
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//
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// (C + 1) * 12 bytes listing the table of contents for the chunks:
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// First 4 bytes describe the chunk id. Value 0 is a terminating label.
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// Other 8 bytes provide the byte-offset in current file for chunk to
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// start. (Chunks are ordered contiguously in the file, so you can infer
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// the length using the next chunk position if necessary.) Each chunk
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// ID appears at most once.
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//
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// The remaining data in the body is described one chunk at a time, and
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// these chunks may be given in any order. Chunks are required unless
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// otherwise specified.
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//
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// CHUNK DATA:
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//
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// OID Fanout (ID: {'O', 'I', 'D', 'F'}) (256 * 4 bytes)
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// The ith entry, F[i], stores the number of OIDs with first
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// byte at most i. Thus F[255] stores the total
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// number of commits (N).
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//
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// OID Lookup (ID: {'O', 'I', 'D', 'L'}) (N * H bytes)
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// The OIDs for all commits in the graph, sorted in ascending order.
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//
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// Commit Data (ID: {'C', 'D', 'A', 'T' }) (N * (H + 16) bytes)
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// * The first H bytes are for the OID of the root tree.
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// * The next 8 bytes are for the positions of the first two parents
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// of the ith commit. Stores value 0x7000000 if no parent in that
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// position. If there are more than two parents, the second value
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// has its most-significant bit on and the other bits store an array
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// position into the Extra Edge List chunk.
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// * The next 8 bytes store the generation number of the commit and
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// the commit time in seconds since EPOCH. The generation number
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// uses the higher 30 bits of the first 4 bytes, while the commit
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// time uses the 32 bits of the second 4 bytes, along with the lowest
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// 2 bits of the lowest byte, storing the 33rd and 34th bit of the
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// commit time.
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//
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// Extra Edge List (ID: {'E', 'D', 'G', 'E'}) [Optional]
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// This list of 4-byte values store the second through nth parents for
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// all octopus merges. The second parent value in the commit data stores
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// an array position within this list along with the most-significant bit
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// on. Starting at that array position, iterate through this list of commit
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// positions for the parents until reaching a value with the most-significant
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// bit on. The other bits correspond to the position of the last parent.
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//
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// TRAILER:
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//
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// H-byte HASH-checksum of all of the above.
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//
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// Source:
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// https://raw.githubusercontent.com/git/git/master/Documentation/technical/commit-graph-format.txt
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package commitgraph
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190
vendor/gopkg.in/src-d/go-git.v4/plumbing/format/commitgraph/encoder.go
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190
vendor/gopkg.in/src-d/go-git.v4/plumbing/format/commitgraph/encoder.go
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package commitgraph
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import (
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"crypto/sha1"
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"hash"
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"io"
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"gopkg.in/src-d/go-git.v4/plumbing"
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"gopkg.in/src-d/go-git.v4/utils/binary"
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)
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// Encoder writes MemoryIndex structs to an output stream.
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type Encoder struct {
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io.Writer
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hash hash.Hash
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}
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// NewEncoder returns a new stream encoder that writes to w.
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func NewEncoder(w io.Writer) *Encoder {
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h := sha1.New()
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mw := io.MultiWriter(w, h)
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return &Encoder{mw, h}
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}
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// Encode writes an index into the commit-graph file
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func (e *Encoder) Encode(idx Index) error {
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var err error
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// Get all the hashes in the input index
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hashes := idx.Hashes()
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// Sort the inout and prepare helper structures we'll need for encoding
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hashToIndex, fanout, extraEdgesCount := e.prepare(idx, hashes)
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chunkSignatures := [][]byte{oidFanoutSignature, oidLookupSignature, commitDataSignature}
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chunkSizes := []uint64{4 * 256, uint64(len(hashes)) * 20, uint64(len(hashes)) * 36}
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if extraEdgesCount > 0 {
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chunkSignatures = append(chunkSignatures, extraEdgeListSignature)
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chunkSizes = append(chunkSizes, uint64(extraEdgesCount)*4)
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}
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if err = e.encodeFileHeader(len(chunkSignatures)); err != nil {
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return err
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}
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if err = e.encodeChunkHeaders(chunkSignatures, chunkSizes); err != nil {
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return err
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}
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if err = e.encodeFanout(fanout); err != nil {
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return err
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}
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if err = e.encodeOidLookup(hashes); err != nil {
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return err
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}
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if extraEdges, err := e.encodeCommitData(hashes, hashToIndex, idx); err == nil {
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if err = e.encodeExtraEdges(extraEdges); err != nil {
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return err
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}
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}
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if err != nil {
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return err
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}
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return e.encodeChecksum()
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}
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func (e *Encoder) prepare(idx Index, hashes []plumbing.Hash) (hashToIndex map[plumbing.Hash]uint32, fanout []uint32, extraEdgesCount uint32) {
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// Sort the hashes and build our index
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plumbing.HashesSort(hashes)
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hashToIndex = make(map[plumbing.Hash]uint32)
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fanout = make([]uint32, 256)
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for i, hash := range hashes {
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hashToIndex[hash] = uint32(i)
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fanout[hash[0]]++
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}
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// Convert the fanout to cumulative values
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for i := 1; i <= 0xff; i++ {
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fanout[i] += fanout[i-1]
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}
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// Find out if we will need extra edge table
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for i := 0; i < len(hashes); i++ {
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v, _ := idx.GetCommitDataByIndex(i)
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if len(v.ParentHashes) > 2 {
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extraEdgesCount += uint32(len(v.ParentHashes) - 1)
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break
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}
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}
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return
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}
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func (e *Encoder) encodeFileHeader(chunkCount int) (err error) {
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if _, err = e.Write(commitFileSignature); err == nil {
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_, err = e.Write([]byte{1, 1, byte(chunkCount), 0})
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}
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return
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}
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func (e *Encoder) encodeChunkHeaders(chunkSignatures [][]byte, chunkSizes []uint64) (err error) {
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// 8 bytes of file header, 12 bytes for each chunk header and 12 byte for terminator
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offset := uint64(8 + len(chunkSignatures)*12 + 12)
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for i, signature := range chunkSignatures {
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if _, err = e.Write(signature); err == nil {
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err = binary.WriteUint64(e, offset)
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}
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if err != nil {
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return
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}
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offset += chunkSizes[i]
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}
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if _, err = e.Write(lastSignature); err == nil {
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err = binary.WriteUint64(e, offset)
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}
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return
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}
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func (e *Encoder) encodeFanout(fanout []uint32) (err error) {
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for i := 0; i <= 0xff; i++ {
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if err = binary.WriteUint32(e, fanout[i]); err != nil {
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return
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}
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}
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return
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}
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func (e *Encoder) encodeOidLookup(hashes []plumbing.Hash) (err error) {
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for _, hash := range hashes {
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if _, err = e.Write(hash[:]); err != nil {
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return err
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}
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}
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return
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}
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|
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func (e *Encoder) encodeCommitData(hashes []plumbing.Hash, hashToIndex map[plumbing.Hash]uint32, idx Index) (extraEdges []uint32, err error) {
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for _, hash := range hashes {
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origIndex, _ := idx.GetIndexByHash(hash)
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commitData, _ := idx.GetCommitDataByIndex(origIndex)
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if _, err = e.Write(commitData.TreeHash[:]); err != nil {
|
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return
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}
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|
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var parent1, parent2 uint32
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if len(commitData.ParentHashes) == 0 {
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parent1 = parentNone
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parent2 = parentNone
|
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} else if len(commitData.ParentHashes) == 1 {
|
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parent1 = hashToIndex[commitData.ParentHashes[0]]
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parent2 = parentNone
|
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} else if len(commitData.ParentHashes) == 2 {
|
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parent1 = hashToIndex[commitData.ParentHashes[0]]
|
||||
parent2 = hashToIndex[commitData.ParentHashes[1]]
|
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} else if len(commitData.ParentHashes) > 2 {
|
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parent1 = hashToIndex[commitData.ParentHashes[0]]
|
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parent2 = uint32(len(extraEdges)) | parentOctopusUsed
|
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for _, parentHash := range commitData.ParentHashes[1:] {
|
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extraEdges = append(extraEdges, hashToIndex[parentHash])
|
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}
|
||||
extraEdges[len(extraEdges)-1] |= parentLast
|
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}
|
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|
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if err = binary.WriteUint32(e, parent1); err == nil {
|
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err = binary.WriteUint32(e, parent2)
|
||||
}
|
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if err != nil {
|
||||
return
|
||||
}
|
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|
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unixTime := uint64(commitData.When.Unix())
|
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unixTime |= uint64(commitData.Generation) << 34
|
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if err = binary.WriteUint64(e, unixTime); err != nil {
|
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return
|
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}
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func (e *Encoder) encodeExtraEdges(extraEdges []uint32) (err error) {
|
||||
for _, parent := range extraEdges {
|
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if err = binary.WriteUint32(e, parent); err != nil {
|
||||
return
|
||||
}
|
||||
}
|
||||
return
|
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}
|
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|
||||
func (e *Encoder) encodeChecksum() error {
|
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_, err := e.Write(e.hash.Sum(nil)[:20])
|
||||
return err
|
||||
}
|
259
vendor/gopkg.in/src-d/go-git.v4/plumbing/format/commitgraph/file.go
generated
vendored
Normal file
259
vendor/gopkg.in/src-d/go-git.v4/plumbing/format/commitgraph/file.go
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vendored
Normal file
@ -0,0 +1,259 @@
|
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package commitgraph
|
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|
||||
import (
|
||||
"bytes"
|
||||
encbin "encoding/binary"
|
||||
"errors"
|
||||
"io"
|
||||
"time"
|
||||
|
||||
"gopkg.in/src-d/go-git.v4/plumbing"
|
||||
"gopkg.in/src-d/go-git.v4/utils/binary"
|
||||
)
|
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|
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var (
|
||||
// ErrUnsupportedVersion is returned by OpenFileIndex when the commit graph
|
||||
// file version is not supported.
|
||||
ErrUnsupportedVersion = errors.New("Unsupported version")
|
||||
// ErrUnsupportedHash is returned by OpenFileIndex when the commit graph
|
||||
// hash function is not supported. Currently only SHA-1 is defined and
|
||||
// supported
|
||||
ErrUnsupportedHash = errors.New("Unsupported hash algorithm")
|
||||
// ErrMalformedCommitGraphFile is returned by OpenFileIndex when the commit
|
||||
// graph file is corrupted.
|
||||
ErrMalformedCommitGraphFile = errors.New("Malformed commit graph file")
|
||||
|
||||
commitFileSignature = []byte{'C', 'G', 'P', 'H'}
|
||||
oidFanoutSignature = []byte{'O', 'I', 'D', 'F'}
|
||||
oidLookupSignature = []byte{'O', 'I', 'D', 'L'}
|
||||
commitDataSignature = []byte{'C', 'D', 'A', 'T'}
|
||||
extraEdgeListSignature = []byte{'E', 'D', 'G', 'E'}
|
||||
lastSignature = []byte{0, 0, 0, 0}
|
||||
|
||||
parentNone = uint32(0x70000000)
|
||||
parentOctopusUsed = uint32(0x80000000)
|
||||
parentOctopusMask = uint32(0x7fffffff)
|
||||
parentLast = uint32(0x80000000)
|
||||
)
|
||||
|
||||
type fileIndex struct {
|
||||
reader io.ReaderAt
|
||||
fanout [256]int
|
||||
oidFanoutOffset int64
|
||||
oidLookupOffset int64
|
||||
commitDataOffset int64
|
||||
extraEdgeListOffset int64
|
||||
}
|
||||
|
||||
// OpenFileIndex opens a serialized commit graph file in the format described at
|
||||
// https://github.com/git/git/blob/master/Documentation/technical/commit-graph-format.txt
|
||||
func OpenFileIndex(reader io.ReaderAt) (Index, error) {
|
||||
fi := &fileIndex{reader: reader}
|
||||
|
||||
if err := fi.verifyFileHeader(); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if err := fi.readChunkHeaders(); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if err := fi.readFanout(); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return fi, nil
|
||||
}
|
||||
|
||||
func (fi *fileIndex) verifyFileHeader() error {
|
||||
// Verify file signature
|
||||
var signature = make([]byte, 4)
|
||||
if _, err := fi.reader.ReadAt(signature, 0); err != nil {
|
||||
return err
|
||||
}
|
||||
if !bytes.Equal(signature, commitFileSignature) {
|
||||
return ErrMalformedCommitGraphFile
|
||||
}
|
||||
|
||||
// Read and verify the file header
|
||||
var header = make([]byte, 4)
|
||||
if _, err := fi.reader.ReadAt(header, 4); err != nil {
|
||||
return err
|
||||
}
|
||||
if header[0] != 1 {
|
||||
return ErrUnsupportedVersion
|
||||
}
|
||||
if header[1] != 1 {
|
||||
return ErrUnsupportedHash
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func (fi *fileIndex) readChunkHeaders() error {
|
||||
var chunkID = make([]byte, 4)
|
||||
for i := 0; ; i++ {
|
||||
chunkHeader := io.NewSectionReader(fi.reader, 8+(int64(i)*12), 12)
|
||||
if _, err := io.ReadAtLeast(chunkHeader, chunkID, 4); err != nil {
|
||||
return err
|
||||
}
|
||||
chunkOffset, err := binary.ReadUint64(chunkHeader)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
if bytes.Equal(chunkID, oidFanoutSignature) {
|
||||
fi.oidFanoutOffset = int64(chunkOffset)
|
||||
} else if bytes.Equal(chunkID, oidLookupSignature) {
|
||||
fi.oidLookupOffset = int64(chunkOffset)
|
||||
} else if bytes.Equal(chunkID, commitDataSignature) {
|
||||
fi.commitDataOffset = int64(chunkOffset)
|
||||
} else if bytes.Equal(chunkID, extraEdgeListSignature) {
|
||||
fi.extraEdgeListOffset = int64(chunkOffset)
|
||||
} else if bytes.Equal(chunkID, lastSignature) {
|
||||
break
|
||||
}
|
||||
}
|
||||
|
||||
if fi.oidFanoutOffset <= 0 || fi.oidLookupOffset <= 0 || fi.commitDataOffset <= 0 {
|
||||
return ErrMalformedCommitGraphFile
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func (fi *fileIndex) readFanout() error {
|
||||
fanoutReader := io.NewSectionReader(fi.reader, fi.oidFanoutOffset, 256*4)
|
||||
for i := 0; i < 256; i++ {
|
||||
fanoutValue, err := binary.ReadUint32(fanoutReader)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if fanoutValue > 0x7fffffff {
|
||||
return ErrMalformedCommitGraphFile
|
||||
}
|
||||
fi.fanout[i] = int(fanoutValue)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (fi *fileIndex) GetIndexByHash(h plumbing.Hash) (int, error) {
|
||||
var oid plumbing.Hash
|
||||
|
||||
// Find the hash in the oid lookup table
|
||||
var low int
|
||||
if h[0] == 0 {
|
||||
low = 0
|
||||
} else {
|
||||
low = fi.fanout[h[0]-1]
|
||||
}
|
||||
high := fi.fanout[h[0]]
|
||||
for low < high {
|
||||
mid := (low + high) >> 1
|
||||
offset := fi.oidLookupOffset + int64(mid)*20
|
||||
if _, err := fi.reader.ReadAt(oid[:], offset); err != nil {
|
||||
return 0, err
|
||||
}
|
||||
cmp := bytes.Compare(h[:], oid[:])
|
||||
if cmp < 0 {
|
||||
high = mid
|
||||
} else if cmp == 0 {
|
||||
return mid, nil
|
||||
} else {
|
||||
low = mid + 1
|
||||
}
|
||||
}
|
||||
|
||||
return 0, plumbing.ErrObjectNotFound
|
||||
}
|
||||
|
||||
func (fi *fileIndex) GetCommitDataByIndex(idx int) (*CommitData, error) {
|
||||
if idx >= fi.fanout[0xff] {
|
||||
return nil, plumbing.ErrObjectNotFound
|
||||
}
|
||||
|
||||
offset := fi.commitDataOffset + int64(idx)*36
|
||||
commitDataReader := io.NewSectionReader(fi.reader, offset, 36)
|
||||
|
||||
treeHash, err := binary.ReadHash(commitDataReader)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
parent1, err := binary.ReadUint32(commitDataReader)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
parent2, err := binary.ReadUint32(commitDataReader)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
genAndTime, err := binary.ReadUint64(commitDataReader)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
var parentIndexes []int
|
||||
if parent2&parentOctopusUsed == parentOctopusUsed {
|
||||
// Octopus merge
|
||||
parentIndexes = []int{int(parent1 & parentOctopusMask)}
|
||||
offset := fi.extraEdgeListOffset + 4*int64(parent2&parentOctopusMask)
|
||||
buf := make([]byte, 4)
|
||||
for {
|
||||
_, err := fi.reader.ReadAt(buf, offset)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
parent := encbin.BigEndian.Uint32(buf)
|
||||
offset += 4
|
||||
parentIndexes = append(parentIndexes, int(parent&parentOctopusMask))
|
||||
if parent&parentLast == parentLast {
|
||||
break
|
||||
}
|
||||
}
|
||||
} else if parent2 != parentNone {
|
||||
parentIndexes = []int{int(parent1 & parentOctopusMask), int(parent2 & parentOctopusMask)}
|
||||
} else if parent1 != parentNone {
|
||||
parentIndexes = []int{int(parent1 & parentOctopusMask)}
|
||||
}
|
||||
|
||||
parentHashes, err := fi.getHashesFromIndexes(parentIndexes)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return &CommitData{
|
||||
TreeHash: treeHash,
|
||||
ParentIndexes: parentIndexes,
|
||||
ParentHashes: parentHashes,
|
||||
Generation: int(genAndTime >> 34),
|
||||
When: time.Unix(int64(genAndTime&0x3FFFFFFFF), 0),
|
||||
}, nil
|
||||
}
|
||||
|
||||
func (fi *fileIndex) getHashesFromIndexes(indexes []int) ([]plumbing.Hash, error) {
|
||||
hashes := make([]plumbing.Hash, len(indexes))
|
||||
|
||||
for i, idx := range indexes {
|
||||
if idx >= fi.fanout[0xff] {
|
||||
return nil, ErrMalformedCommitGraphFile
|
||||
}
|
||||
|
||||
offset := fi.oidLookupOffset + int64(idx)*20
|
||||
if _, err := fi.reader.ReadAt(hashes[i][:], offset); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
}
|
||||
|
||||
return hashes, nil
|
||||
}
|
||||
|
||||
// Hashes returns all the hashes that are available in the index
|
||||
func (fi *fileIndex) Hashes() []plumbing.Hash {
|
||||
hashes := make([]plumbing.Hash, fi.fanout[0xff])
|
||||
for i := 0; i < int(fi.fanout[0xff]); i++ {
|
||||
offset := fi.oidLookupOffset + int64(i)*20
|
||||
if n, err := fi.reader.ReadAt(hashes[i][:], offset); err != nil || n < 20 {
|
||||
return nil
|
||||
}
|
||||
}
|
||||
return hashes
|
||||
}
|
72
vendor/gopkg.in/src-d/go-git.v4/plumbing/format/commitgraph/memory.go
generated
vendored
Normal file
72
vendor/gopkg.in/src-d/go-git.v4/plumbing/format/commitgraph/memory.go
generated
vendored
Normal file
@ -0,0 +1,72 @@
|
||||
package commitgraph
|
||||
|
||||
import (
|
||||
"gopkg.in/src-d/go-git.v4/plumbing"
|
||||
)
|
||||
|
||||
// MemoryIndex provides a way to build the commit-graph in memory
|
||||
// for later encoding to file.
|
||||
type MemoryIndex struct {
|
||||
commitData []*CommitData
|
||||
indexMap map[plumbing.Hash]int
|
||||
}
|
||||
|
||||
// NewMemoryIndex creates in-memory commit graph representation
|
||||
func NewMemoryIndex() *MemoryIndex {
|
||||
return &MemoryIndex{
|
||||
indexMap: make(map[plumbing.Hash]int),
|
||||
}
|
||||
}
|
||||
|
||||
// GetIndexByHash gets the index in the commit graph from commit hash, if available
|
||||
func (mi *MemoryIndex) GetIndexByHash(h plumbing.Hash) (int, error) {
|
||||
i, ok := mi.indexMap[h]
|
||||
if ok {
|
||||
return i, nil
|
||||
}
|
||||
|
||||
return 0, plumbing.ErrObjectNotFound
|
||||
}
|
||||
|
||||
// GetCommitDataByIndex gets the commit node from the commit graph using index
|
||||
// obtained from child node, if available
|
||||
func (mi *MemoryIndex) GetCommitDataByIndex(i int) (*CommitData, error) {
|
||||
if int(i) >= len(mi.commitData) {
|
||||
return nil, plumbing.ErrObjectNotFound
|
||||
}
|
||||
|
||||
commitData := mi.commitData[i]
|
||||
|
||||
// Map parent hashes to parent indexes
|
||||
if commitData.ParentIndexes == nil {
|
||||
parentIndexes := make([]int, len(commitData.ParentHashes))
|
||||
for i, parentHash := range commitData.ParentHashes {
|
||||
var err error
|
||||
if parentIndexes[i], err = mi.GetIndexByHash(parentHash); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
}
|
||||
commitData.ParentIndexes = parentIndexes
|
||||
}
|
||||
|
||||
return commitData, nil
|
||||
}
|
||||
|
||||
// Hashes returns all the hashes that are available in the index
|
||||
func (mi *MemoryIndex) Hashes() []plumbing.Hash {
|
||||
hashes := make([]plumbing.Hash, 0, len(mi.indexMap))
|
||||
for k := range mi.indexMap {
|
||||
hashes = append(hashes, k)
|
||||
}
|
||||
return hashes
|
||||
}
|
||||
|
||||
// Add adds new node to the memory index
|
||||
func (mi *MemoryIndex) Add(hash plumbing.Hash, commitData *CommitData) {
|
||||
// The parent indexes are calculated lazily in GetNodeByIndex
|
||||
// which allows adding nodes out of order as long as all parents
|
||||
// are eventually resolved
|
||||
commitData.ParentIndexes = nil
|
||||
mi.indexMap[hash] = len(mi.commitData)
|
||||
mi.commitData = append(mi.commitData, commitData)
|
||||
}
|
Reference in New Issue
Block a user