/
index.go
226 lines (193 loc) · 4.8 KB
/
index.go
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package manifest
import (
"bufio"
"bytes"
"database/sql"
"log"
"os"
"path/filepath"
"strings"
"time"
"github.com/arken/arken/database"
"github.com/go-git/go-git/v5"
"github.com/go-git/go-git/v5/plumbing"
"github.com/ipfs/go-cid"
)
func (m *Manifest) Index(db *database.DB, force bool) (chan database.File, error) {
// Grab the manifest lock before starting an index to prevent
// other systems from indexing at the same time.
m.lock.Lock()
defer m.lock.Unlock()
// Check to see if an existing commit checkpoint exists
commit, err := m.getCommit()
if err != nil && !os.IsNotExist(err) {
return nil, err
}
// Grab the current commit of the repository
ref, err := m.r.Head()
if err != nil {
return nil, err
}
// Create results channel
results := make(chan database.File, 50)
// Initialize go routine to handle indexing
go func() {
// Check if fullIndex or diffIndex should be used.
switch {
case commit != "" && ref.Hash().String() != commit && !force:
m.indexDiff(commit, results)
case commit == "" || force:
m.indexFull(db, results)
}
// Save current git hash as checkpoint.
m.setCommit(ref.Hash().String())
// Close results channel
close(results)
}()
return results, nil
}
func (m *Manifest) indexFull(db *database.DB, results chan<- database.File) {
// Store current time to find files not touched during index
start := time.Now().UTC()
// Walk through entire repository directory structure to look for .ks files.
err := filepath.Walk(m.path, func(path string, info os.FileInfo, err error) error {
// On each interation of the "walk" this function will check if a manifest
// file and parse for file IDs if true.
if strings.HasSuffix(filepath.Base(path), ".ks") {
file, err := os.Open(path)
// This shouldn't be an error unless part of the manifest was
// corrupted in transit.
if err != nil {
return err
}
defer file.Close()
// Open the files for reading.
scanner := bufio.NewScanner(file)
// Scan one line at a time.
for scanner.Scan() {
// Split data on white space.
data := strings.Fields(scanner.Text())
// Check if entry is already in the database.
if file, err := db.Get(data[0]); err == nil || err != sql.ErrNoRows {
if err == nil {
// Update file name if changed
file.Name = data[1]
// Update existing entry in db to modify time
_, err = db.Update(file)
if err != nil {
return err
}
}
continue
}
// Only add files not in the DB to the added channel
results <- database.File{
ID: data[0],
Name: data[1],
Status: "add",
Size: 0,
}
}
if err := scanner.Err(); err != nil {
return err
}
}
return nil
})
if err != nil {
log.Println(err)
}
// Check for deleted files by looking for everything not touched by the index
for i := 0; ; i++ {
files, err := db.GetAllOlderThan(start, 100, i)
if err != nil {
break
}
for _, file := range files {
file.Status = "remove"
results <- file
}
}
if err != nil && err != sql.ErrNoRows {
log.Println(err)
}
}
func (m *Manifest) indexDiff(oldCommit string, results chan<- database.File) {
r, err := git.PlainOpen(m.path)
if err != nil {
log.Println(err)
return
}
ref, err := r.Head()
if err != nil {
log.Println(err)
return
}
commit, err := r.CommitObject(ref.Hash())
if err != nil {
log.Println(err)
return
}
parent, err := r.CommitObject(plumbing.NewHash(oldCommit))
if err != nil {
log.Println(err)
return
}
diff, err := parent.Patch(commit)
if err != nil {
log.Println(err)
return
}
buf := new(bytes.Buffer)
err = diff.Encode(buf)
if err != nil {
log.Println(err)
return
}
entries := make(map[string]database.File)
lines := strings.Split(buf.String(), "\n")
for i := range lines {
data := strings.Fields(lines[i])
if len(data) <= 1 {
continue
}
id := strings.TrimPrefix(strings.TrimPrefix(data[0], "+"), "-")
_, err := cid.Decode(id)
if err != nil {
continue
}
fileTemplate := database.File{}
if strings.HasPrefix(lines[i], "+") {
// Set custom file values.
fileTemplate.ID = id
fileTemplate.Name = data[1]
fileTemplate.Status = "add"
entry, ok := entries[fileTemplate.ID]
if !ok {
entries[fileTemplate.ID] = fileTemplate
} else if entry.Status == "remove" {
delete(entries, entry.ID)
}
}
if strings.HasPrefix(lines[i], "-") {
// Set custom file values.
fileTemplate.ID = id
fileTemplate.Name = data[1]
fileTemplate.Status = "remove"
entry, ok := entries[fileTemplate.ID]
if !ok {
entries[fileTemplate.ID] = fileTemplate
} else if entry.Status == "add" {
delete(entries, entry.ID)
}
}
}
for _, entry := range entries {
if entry.Status == "add" {
results <- entry
}
if entry.Status == "remove" {
results <- entry
}
}
}