Add hashGlobs query to state service

cmd/state-svc/internal/hash/file_hasher.go

@@ -0,0 +1,75 @@
+package hash
+
+import (
+	"encoding/base64"
+	"fmt"
+	"io"
+	"os"
+	"sort"
+	"time"
+
+	"github.com/ActiveState/cli/internal/errs"
+	"github.com/ActiveState/cli/internal/rtutils"
+	"github.com/cespare/xxhash"
+	"github.com/patrickmn/go-cache"
+)
+
+type fileCache interface {
+	Get(key string) (interface{}, bool)
+	Set(key string, value interface{}, expiration time.Duration)
+}
+
+type FileHasher struct {
+	cache fileCache
+}
+
+func NewFileHasher() *FileHasher {
+	return &FileHasher{
+		cache: cache.New(cache.NoExpiration, 24*time.Hour),
+	}
+}
+
+func (fh *FileHasher) HashFiles(files []string) (hash string, rerr error) {
+	sort.Strings(files)
+
+	hasher := xxhash.New()
+	for _, f := range files {
+		file, err := os.Open(f)
+		if err != nil {
+			return "", errs.Wrap(err, "Could not open file: %s", file.Name())
+		}
+		defer rtutils.Closer(file.Close, &rerr)
+
+		fileInfo, err := file.Stat()
+		if err != nil {
+			return "", errs.Wrap(err, "Could not stat file: %s", file.Name())
+		}
+
+		var hash string
+		cachedHash, ok := fh.cache.Get(cacheKey(file.Name(), fileInfo.ModTime()))
+		if ok {
+			hash, ok = cachedHash.(string)
+			if !ok {
+				return "", errs.New("Could not convert cache value to string")
+			}
+		} else {
+			fileHasher := xxhash.New()
+			if _, err := io.Copy(fileHasher, file); err != nil {
+				return "", errs.Wrap(err, "Could not hash file: %s", file.Name())
+			}
+
+			hash = fmt.Sprintf("%x", fileHasher.Sum(nil))
+		}
+
+		fh.cache.Set(cacheKey(file.Name(), fileInfo.ModTime()), hash, cache.NoExpiration)
+
+		// Incorporate the individual file hash into the overall hash in hex format
+		fmt.Fprintf(hasher, "%x", hash)
+	}
+
+	return base64.StdEncoding.EncodeToString(hasher.Sum(nil)), nil
+}
+
+func cacheKey(file string, modTime time.Time) string {
+	return fmt.Sprintf("%s-%d", file, modTime.UTC().UnixNano())
+}

cmd/state-svc/internal/hash/file_hasher_test.go

@@ -0,0 +1,228 @@
+package hash
+
+import (
+	"os"
+	"testing"
+	"time"
+
+	"github.com/patrickmn/go-cache"
+	"github.com/stretchr/testify/assert"
+)
+
+type testCache struct {
+	cache  *cache.Cache
+	hits   []string
+	misses []string
+}
+
+func (tc *testCache) Get(key string) (interface{}, bool) {
+	val, ok := tc.cache.Get(key)
+	if ok {
+		tc.hits = append(tc.hits, key)
+	} else {
+		tc.misses = append(tc.misses, key)
+	}
+
+	return val, ok
+}
+
+func (tc *testCache) Set(key string, value interface{}, expiration time.Duration) {
+	tc.cache.Set(key, value, cache.DefaultExpiration)
+}
+
+func TestFileHasher_HashFiles(t *testing.T) {
+	file1 := createTempFile(t, "file1")
+	file2 := createTempFile(t, "file2")
+
+	hasher := NewFileHasher()
+
+	hash1, err := hasher.HashFiles([]string{file1, file2})
+	assert.NoError(t, err)
+
+	hash2, err := hasher.HashFiles([]string{file1, file2})
+	assert.NoError(t, err)
+
+	assert.Equal(t, hash1, hash2)
+}
+
+func TestFileHasher_CacheHit(t *testing.T) {
+	file1 := createTempFile(t, "file1")
+	file2 := createTempFile(t, "file2")
+
+	tc := &testCache{
+		cache: cache.New(cache.NoExpiration, cache.NoExpiration),
+	}
+
+	hasher := &FileHasher{
+		cache: tc,
+	}
+
+	hash1, err := hasher.HashFiles([]string{file1, file2})
+	assert.NoError(t, err)
+
+	hash2, err := hasher.HashFiles([]string{file1, file2})
+	assert.NoError(t, err)
+
+	assert.Equal(t, hash1, hash2)
+	assert.Len(t, tc.hits, 2)
+	assert.Len(t, tc.misses, 2)
+}
+
+func TestFileHasher_CacheMiss(t *testing.T) {
+	file1 := createTempFile(t, "file1")
+	file2 := createTempFile(t, "file2")
+
+	tc := &testCache{
+		cache: cache.New(cache.NoExpiration, cache.NoExpiration),
+	}
+
+	hasher := &FileHasher{
+		cache: tc,
+	}
+
+	hash1, err := hasher.HashFiles([]string{file1, file2})
+	assert.NoError(t, err)
+
+	if err := os.Chtimes(file1, time.Now(), time.Now()); err != nil {
+		t.Fatal(err)
+	}
+
+	file, err := os.Open(file1)
+	assert.NoError(t, err)
+	err = file.Sync()
+	assert.NoError(t, err)
+
+	hash2, err := hasher.HashFiles([]string{file1, file2})
+	assert.NoError(t, err)
+
+	assert.Equal(t, hash1, hash2)
+	assert.Len(t, tc.hits, 1)
+	assert.Len(t, tc.misses, 3)
+}
+
+func TestFileHasher_ContentAgnostic(t *testing.T) {
+	// Files have same content but different names and modification times
+	file1 := createTempFile(t, "file1")
+
+	// Ensure mod times are different
+	time.Sleep(1 * time.Millisecond)
+	file2 := createTempFile(t, "file1")
+
+	tc := &testCache{
+		cache: cache.New(cache.NoExpiration, cache.NoExpiration),
+	}
+
+	hasher := &FileHasher{
+		cache: tc,
+	}
+
+	hash1, err := hasher.HashFiles([]string{file1, file2})
+	assert.NoError(t, err)
+
+	hash2, err := hasher.HashFiles([]string{file1, file2})
+	assert.NoError(t, err)
+
+	assert.Equal(t, hash1, hash2)
+	assert.Len(t, tc.hits, 2)
+	assert.Len(t, tc.misses, 2)
+}
+
+func TestFileHasher_NotEqualFileAdded(t *testing.T) {
+	file1 := createTempFile(t, "file1")
+	file2 := createTempFile(t, "file2")
+	file3 := createTempFile(t, "file3")
+
+	tc := &testCache{
+		cache: cache.New(cache.NoExpiration, cache.NoExpiration),
+	}
+
+	hasher := &FileHasher{
+		cache: tc,
+	}
+
+	hash1, err := hasher.HashFiles([]string{file1, file2})
+	assert.NoError(t, err)
+
+	hash2, err := hasher.HashFiles([]string{file1, file2, file3})
+	assert.NoError(t, err)
+
+	assert.NotEqual(t, hash1, hash2)
+	assert.Len(t, tc.hits, 2)
+	assert.Len(t, tc.misses, 3)
+}
+
+func TestFileHasher_NotEqualFileRemoved(t *testing.T) {
+	file1 := createTempFile(t, "file1")
+	file2 := createTempFile(t, "file2")
+	file3 := createTempFile(t, "file3")
+
+	tc := &testCache{
+		cache: cache.New(cache.NoExpiration, cache.NoExpiration),
+	}
+
+	hasher := &FileHasher{
+		cache: tc,
+	}
+
+	hash1, err := hasher.HashFiles([]string{file1, file2, file3})
+	assert.NoError(t, err)
+
+	hash2, err := hasher.HashFiles([]string{file1, file2})
+	assert.NoError(t, err)
+
+	assert.NotEqual(t, hash1, hash2)
+	assert.Len(t, tc.hits, 2)
+	assert.Len(t, tc.misses, 3)
+}
+
+func TestFileHasher_NotEqualContentChanged(t *testing.T) {
+	file1 := createTempFile(t, "file1")
+	file2 := createTempFile(t, "file2")
+
+	tc := &testCache{
+		cache: cache.New(cache.NoExpiration, cache.NoExpiration),
+	}
+
+	hasher := &FileHasher{
+		cache: tc,
+	}
+
+	hash1, err := hasher.HashFiles([]string{file1, file2})
+	assert.NoError(t, err)
+
+	hash2, err := hasher.HashFiles([]string{file1, file2})
+	assert.NoError(t, err)
+
+	assert.Equal(t, hash1, hash2)
+
+	// Change content of file1 and ensure mod time is different to avoid a cache hit.
+	// The time these tests take as well as the accuracy of the file system's mod time
+	// resolution may cause the mod time to be the same.
+	time.Sleep(10 * time.Millisecond)
+	if err := os.WriteFile(file1, []byte("file1_changed"), 0644); err != nil {
+		t.Fatal(err)
+	}
+
+	hash2Modified, err := hasher.HashFiles([]string{file1, file2})
+	assert.NoError(t, err)
+
+	assert.NotEqual(t, hash1, hash2Modified)
+	assert.Len(t, tc.hits, 3)
+	assert.Len(t, tc.misses, 3)
+}
+
+func createTempFile(t *testing.T, content string) string {
+	tmpfile, err := os.CreateTemp("", "testfile")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if _, err := tmpfile.Write([]byte(content)); err != nil {
+		t.Fatal(err)
+	}
+	if err := tmpfile.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	return tmpfile.Name()
+}

cmd/state-svc/internal/resolver/resolver.go

@@ -4,11 +4,13 @@ import (
 	"context"
 	"encoding/json"
 	"os"
+	"path/filepath"
 	"runtime/debug"
 	"sort"
 	"strconv"
 	"time"
 
+	"github.com/ActiveState/cli/cmd/state-svc/internal/hash"
 	"github.com/ActiveState/cli/cmd/state-svc/internal/messages"
 	"github.com/ActiveState/cli/cmd/state-svc/internal/rtwatcher"
 	genserver "github.com/ActiveState/cli/cmd/state-svc/internal/server/generated"
@@ -36,6 +38,7 @@ type Resolver struct {
 	updatePoller   *poller.Poller
 	authPoller     *poller.Poller
 	projectIDCache *projectcache.ID
+	fileHasher     *hash.FileHasher
 	an             *sync.Client
 	anForClient    *sync.Client // Use separate client for events sent through service so we don't contaminate one with the other
 	rtwatch        *rtwatcher.Watcher
@@ -81,6 +84,7 @@ func New(cfg *config.Instance, an *sync.Client, auth *authentication.Auth) (*Res
 		pollUpdate,
 		pollAuth,
 		projectcache.NewID(),
+		hash.NewFileHasher(),
 		an,
 		anForClient,
 		rtwatcher.New(cfg, anForClient),
@@ -263,6 +267,8 @@ func (r *Resolver) GetProcessesInUse(ctx context.Context, execDir string) ([]*gr
 }
 
 func (r *Resolver) GetJwt(ctx context.Context) (*graph.Jwt, error) {
+	defer func() { handlePanics(recover(), debug.Stack()) }()
+
 	if err := r.auth.MaybeRenew(); err != nil {
 		return nil, errs.Wrap(err, "Could not renew auth token")
 	}
@@ -296,6 +302,21 @@ func (r *Resolver) GetJwt(ctx context.Context) (*graph.Jwt, error) {
 	return jwt, nil
 }
 
+func (r *Resolver) HashGlobs(ctx context.Context, globs []string) (string, error) {
+	defer func() { handlePanics(recover(), debug.Stack()) }()
+
+	var files []string
+	for _, glob := range globs {
+		matches, err := filepath.Glob(glob)
+		if err != nil {
+			return "", errs.Wrap(err, "Could not match glob: %s", glob)
+		}
+		files = append(files, matches...)
+	}
+
+	return r.fileHasher.HashFiles(files)
+}
+
 func handlePanics(recovered interface{}, stack []byte) {
 	if recovered != nil {
 		multilog.Error("Panic: %v", recovered)