cache,bug,identity: structural change

- bug doesn't commit identities anymore, only make sure they are commit
- cache use an IdentityResolver to load bugs with identities from the cache (deps injection)
- IdentityCache now are identity.Interface

8 files changed, 112 insertions, 89 deletions

diff --git a/bug/bug.go b/bug/bug.go
index 2ee89031..6f5d0a7a 100644
--- a/bug/bug.go
+++ b/bug/bug.go
@@ -74,48 +74,32 @@ func NewBug() *Bug {
 	return &Bug{}
 }
 
-// FindLocalBug find an existing Bug matching a prefix
-func FindLocalBug(repo repository.ClockedRepo, prefix string) (*Bug, error) {
-	ids, err := ListLocalIds(repo)
-
-	if err != nil {
-		return nil, err
-	}
-
-	// preallocate but empty
-	matching := make([]entity.Id, 0, 5)
-
-	for _, id := range ids {
-		if id.HasPrefix(prefix) {
-			matching = append(matching, id)
-		}
-	}
-
-	if len(matching) == 0 {
-		return nil, errors.New("no matching bug found.")
-	}
-
-	if len(matching) > 1 {
-		return nil, NewErrMultipleMatchBug(matching)
-	}
-
-	return ReadLocalBug(repo, matching[0])
+// ReadLocal will read a local bug from its hash
+func ReadLocal(repo repository.ClockedRepo, id entity.Id) (*Bug, error) {
+	ref := bugsRefPattern + id.String()
+	return read(repo, identity.NewSimpleResolver(repo), ref)
 }
 
-// ReadLocalBug will read a local bug from its hash
-func ReadLocalBug(repo repository.ClockedRepo, id entity.Id) (*Bug, error) {
+// ReadLocalWithResolver will read a local bug from its hash
+func ReadLocalWithResolver(repo repository.ClockedRepo, identityResolver identity.Resolver, id entity.Id) (*Bug, error) {
 	ref := bugsRefPattern + id.String()
-	return readBug(repo, ref)
+	return read(repo, identityResolver, ref)
+}
+
+// ReadRemote will read a remote bug from its hash
+func ReadRemote(repo repository.ClockedRepo, remote string, id entity.Id) (*Bug, error) {
+	ref := fmt.Sprintf(bugsRemoteRefPattern, remote) + id.String()
+	return read(repo, identity.NewSimpleResolver(repo), ref)
 }
 
-// ReadRemoteBug will read a remote bug from its hash
-func ReadRemoteBug(repo repository.ClockedRepo, remote string, id entity.Id) (*Bug, error) {
+// ReadRemoteWithResolver will read a remote bug from its hash
+func ReadRemoteWithResolver(repo repository.ClockedRepo, identityResolver identity.Resolver, remote string, id entity.Id) (*Bug, error) {
 	ref := fmt.Sprintf(bugsRemoteRefPattern, remote) + id.String()
-	return readBug(repo, ref)
+	return read(repo, identityResolver, ref)
 }
 
-// readBug will read and parse a Bug from git
-func readBug(repo repository.ClockedRepo, ref string) (*Bug, error) {
+// read will read and parse a Bug from git
+func read(repo repository.ClockedRepo, identityResolver identity.Resolver, ref string) (*Bug, error) {
 	refSplit := strings.Split(ref, "/")
 	id := entity.Id(refSplit[len(refSplit)-1])
 
@@ -233,8 +217,7 @@ func readBug(repo repository.ClockedRepo, ref string) (*Bug, error) {
 	}
 
 	// Make sure that the identities are properly loaded
-	resolver := identity.NewSimpleResolver(repo)
-	err = bug.EnsureIdentities(resolver)
+	err = bug.EnsureIdentities(identityResolver)
 	if err != nil {
 		return nil, err
 	}
@@ -297,19 +280,30 @@ type StreamedBug struct {
 	Err error
 }
 
-// ReadAllLocalBugs read and parse all local bugs
-func ReadAllLocalBugs(repo repository.ClockedRepo) <-chan StreamedBug {
-	return readAllBugs(repo, bugsRefPattern)
+// ReadAllLocal read and parse all local bugs
+func ReadAllLocal(repo repository.ClockedRepo) <-chan StreamedBug {
+	return readAll(repo, identity.NewSimpleResolver(repo), bugsRefPattern)
+}
+
+// ReadAllLocalWithResolver read and parse all local bugs
+func ReadAllLocalWithResolver(repo repository.ClockedRepo, identityResolver identity.Resolver) <-chan StreamedBug {
+	return readAll(repo, identityResolver, bugsRefPattern)
+}
+
+// ReadAllRemote read and parse all remote bugs for a given remote
+func ReadAllRemote(repo repository.ClockedRepo, remote string) <-chan StreamedBug {
+	refPrefix := fmt.Sprintf(bugsRemoteRefPattern, remote)
+	return readAll(repo, identity.NewSimpleResolver(repo), refPrefix)
 }
 
-// ReadAllRemoteBugs read and parse all remote bugs for a given remote
-func ReadAllRemoteBugs(repo repository.ClockedRepo, remote string) <-chan StreamedBug {
+// ReadAllRemoteWithResolver read and parse all remote bugs for a given remote
+func ReadAllRemoteWithResolver(repo repository.ClockedRepo, identityResolver identity.Resolver, remote string) <-chan StreamedBug {
 	refPrefix := fmt.Sprintf(bugsRemoteRefPattern, remote)
-	return readAllBugs(repo, refPrefix)
+	return readAll(repo, identityResolver, refPrefix)
 }
 
 // Read and parse all available bug with a given ref prefix
-func readAllBugs(repo repository.ClockedRepo, refPrefix string) <-chan StreamedBug {
+func readAll(repo repository.ClockedRepo, identityResolver identity.Resolver, refPrefix string) <-chan StreamedBug {
 	out := make(chan StreamedBug)
 
 	go func() {
@@ -322,7 +316,7 @@ func readAllBugs(repo repository.ClockedRepo, refPrefix string) <-chan StreamedB
 		}
 
 		for _, ref := range refs {
-			b, err := readBug(repo, ref)
+			b, err := read(repo, identityResolver, ref)
 
 			if err != nil {
 				out <- StreamedBug{Err: err}
diff --git a/bug/bug_actions.go b/bug/bug_actions.go
index f99f83ad..21ce3733 100644
--- a/bug/bug_actions.go
+++ b/bug/bug_actions.go
@@ -5,6 +5,7 @@ import (
 	"strings"
 
 	"github.com/MichaelMure/git-bug/entity"
+	"github.com/MichaelMure/git-bug/identity"
 	"github.com/MichaelMure/git-bug/repository"
 	"github.com/pkg/errors"
 )
@@ -57,6 +58,11 @@ func Pull(repo repository.ClockedRepo, remote string) error {
 func MergeAll(repo repository.ClockedRepo, remote string) <-chan entity.MergeResult {
 	out := make(chan entity.MergeResult)
 
+	// no caching for the merge, we load everything from git even if that means multiple
+	// copy of the same entity in memory. The cache layer will intercept the results to
+	// invalidate entities if necessary.
+	identityResolver := identity.NewSimpleResolver(repo)
+
 	go func() {
 		defer close(out)
 
@@ -77,7 +83,7 @@ func MergeAll(repo repository.ClockedRepo, remote string) <-chan entity.MergeRes
 				continue
 			}
 
-			remoteBug, err := readBug(repo, remoteRef)
+			remoteBug, err := read(repo, identityResolver, remoteRef)
 
 			if err != nil {
 				out <- entity.NewMergeInvalidStatus(id, errors.Wrap(err, "remote bug is not readable").Error())
@@ -111,7 +117,7 @@ func MergeAll(repo repository.ClockedRepo, remote string) <-chan entity.MergeRes
 				continue
 			}
 
-			localBug, err := readBug(repo, localRef)
+			localBug, err := read(repo, identityResolver, localRef)
 
 			if err != nil {
 				out <- entity.NewMergeError(errors.Wrap(err, "local bug is not readable"), id)
diff --git a/bug/bug_actions_test.go b/bug/bug_actions_test.go
index c867ac80..df35a5e5 100644
--- a/bug/bug_actions_test.go
+++ b/bug/bug_actions_test.go
@@ -16,6 +16,8 @@ func TestPushPull(t *testing.T) {
 	defer repository.CleanupTestRepos(repoA, repoB, remote)
 
 	reneA := identity.NewIdentity("René Descartes", "rene@descartes.fr")
+	err := reneA.Commit(repoA)
+	require.NoError(t, err)
 
 	bug1, _, err := Create(reneA, time.Now().Unix(), "bug1", "message")
 	require.NoError(t, err)
@@ -37,7 +39,7 @@ func TestPushPull(t *testing.T) {
 	err = Pull(repoB, "origin")
 	require.NoError(t, err)
 
-	bugs := allBugs(t, ReadAllLocalBugs(repoB))
+	bugs := allBugs(t, ReadAllLocal(repoB))
 
 	if len(bugs) != 1 {
 		t.Fatal("Unexpected number of bugs")
@@ -58,7 +60,7 @@ func TestPushPull(t *testing.T) {
 	err = Pull(repoA, "origin")
 	require.NoError(t, err)
 
-	bugs = allBugs(t, ReadAllLocalBugs(repoA))
+	bugs = allBugs(t, ReadAllLocal(repoA))
 
 	if len(bugs) != 2 {
 		t.Fatal("Unexpected number of bugs")
@@ -91,6 +93,8 @@ func _RebaseTheirs(t testing.TB) {
 	defer repository.CleanupTestRepos(repoA, repoB, remote)
 
 	reneA := identity.NewIdentity("René Descartes", "rene@descartes.fr")
+	err := reneA.Commit(repoA)
+	require.NoError(t, err)
 
 	bug1, _, err := Create(reneA, time.Now().Unix(), "bug1", "message")
 	require.NoError(t, err)
@@ -114,7 +118,7 @@ func _RebaseTheirs(t testing.TB) {
 	err = Pull(repoB, "origin")
 	require.NoError(t, err)
 
-	bug2, err := ReadLocalBug(repoB, bug1.Id())
+	bug2, err := ReadLocal(repoB, bug1.Id())
 	require.NoError(t, err)
 	assert.False(t, bug2.NeedCommit())
 
@@ -140,13 +144,13 @@ func _RebaseTheirs(t testing.TB) {
 	err = Pull(repoA, "origin")
 	require.NoError(t, err)
 
-	bugs := allBugs(t, ReadAllLocalBugs(repoB))
+	bugs := allBugs(t, ReadAllLocal(repoB))
 
 	if len(bugs) != 1 {
 		t.Fatal("Unexpected number of bugs")
 	}
 
-	bug3, err := ReadLocalBug(repoA, bug1.Id())
+	bug3, err := ReadLocal(repoA, bug1.Id())
 	require.NoError(t, err)
 
 	if nbOps(bug3) != 4 {
@@ -169,6 +173,8 @@ func _RebaseOurs(t testing.TB) {
 	defer repository.CleanupTestRepos(repoA, repoB, remote)
 
 	reneA := identity.NewIdentity("René Descartes", "rene@descartes.fr")
+	err := reneA.Commit(repoA)
+	require.NoError(t, err)
 
 	bug1, _, err := Create(reneA, time.Now().Unix(), "bug1", "message")
 	require.NoError(t, err)
@@ -220,13 +226,13 @@ func _RebaseOurs(t testing.TB) {
 	err = Pull(repoA, "origin")
 	require.NoError(t, err)
 
-	bugs := allBugs(t, ReadAllLocalBugs(repoA))
+	bugs := allBugs(t, ReadAllLocal(repoA))
 
 	if len(bugs) != 1 {
 		t.Fatal("Unexpected number of bugs")
 	}
 
-	bug2, err := ReadLocalBug(repoA, bug1.Id())
+	bug2, err := ReadLocal(repoA, bug1.Id())
 	require.NoError(t, err)
 
 	if nbOps(bug2) != 10 {
@@ -258,6 +264,8 @@ func _RebaseConflict(t testing.TB) {
 	defer repository.CleanupTestRepos(repoA, repoB, remote)
 
 	reneA := identity.NewIdentity("René Descartes", "rene@descartes.fr")
+	err := reneA.Commit(repoA)
+	require.NoError(t, err)
 
 	bug1, _, err := Create(reneA, time.Now().Unix(), "bug1", "message")
 	require.NoError(t, err)
@@ -305,7 +313,7 @@ func _RebaseConflict(t testing.TB) {
 	err = bug1.Commit(repoA)
 	require.NoError(t, err)
 
-	bug2, err := ReadLocalBug(repoB, bug1.Id())
+	bug2, err := ReadLocal(repoB, bug1.Id())
 	require.NoError(t, err)
 
 	reneB, err := identity.ReadLocal(repoA, reneA.Id())
@@ -346,13 +354,13 @@ func _RebaseConflict(t testing.TB) {
 	err = Pull(repoB, "origin")
 	require.NoError(t, err)
 
-	bugs := allBugs(t, ReadAllLocalBugs(repoB))
+	bugs := allBugs(t, ReadAllLocal(repoB))
 
 	if len(bugs) != 1 {
 		t.Fatal("Unexpected number of bugs")
 	}
 
-	bug3, err := ReadLocalBug(repoB, bug1.Id())
+	bug3, err := ReadLocal(repoB, bug1.Id())
 	require.NoError(t, err)
 
 	if nbOps(bug3) != 19 {
@@ -367,13 +375,13 @@ func _RebaseConflict(t testing.TB) {
 	err = Pull(repoA, "origin")
 	require.NoError(t, err)
 
-	bugs = allBugs(t, ReadAllLocalBugs(repoA))
+	bugs = allBugs(t, ReadAllLocal(repoA))
 
 	if len(bugs) != 1 {
 		t.Fatal("Unexpected number of bugs")
 	}
 
-	bug4, err := ReadLocalBug(repoA, bug1.Id())
+	bug4, err := ReadLocal(repoA, bug1.Id())
 	require.NoError(t, err)
 
 	if nbOps(bug4) != 19 {
diff --git a/bug/bug_test.go b/bug/bug_test.go
index ac7da693..05f6e617 100644
--- a/bug/bug_test.go
+++ b/bug/bug_test.go
@@ -5,7 +5,6 @@ import (
 	"testing"
 	"time"
 
-	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
 	"github.com/MichaelMure/git-bug/identity"
@@ -18,11 +17,14 @@ func TestBugId(t *testing.T) {
 	bug1 := NewBug()
 
 	rene := identity.NewIdentity("René Descartes", "rene@descartes.fr")
+	err := rene.Commit(mockRepo)
+	require.NoError(t, err)
+
 	createOp := NewCreateOp(rene, time.Now().Unix(), "title", "message", nil)
 
 	bug1.Append(createOp)
 
-	err := bug1.Commit(mockRepo)
+	err = bug1.Commit(mockRepo)
 
 	if err != nil {
 		t.Fatal(err)
@@ -37,6 +39,9 @@ func TestBugValidity(t *testing.T) {
 	bug1 := NewBug()
 
 	rene := identity.NewIdentity("René Descartes", "rene@descartes.fr")
+	err := rene.Commit(mockRepo)
+	require.NoError(t, err)
+
 	createOp := NewCreateOp(rene, time.Now().Unix(), "title", "message", nil)
 
 	if bug1.Validate() == nil {
@@ -49,7 +54,7 @@ func TestBugValidity(t *testing.T) {
 		t.Fatal("Bug with just a CreateOp should be valid")
 	}
 
-	err := bug1.Commit(mockRepo)
+	err = bug1.Commit(mockRepo)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -67,9 +72,14 @@ func TestBugValidity(t *testing.T) {
 }
 
 func TestBugCommitLoad(t *testing.T) {
+	repo := repository.NewMockRepoForTest()
+
 	bug1 := NewBug()
 
 	rene := identity.NewIdentity("René Descartes", "rene@descartes.fr")
+	err := rene.Commit(repo)
+	require.NoError(t, err)
+
 	createOp := NewCreateOp(rene, time.Now().Unix(), "title", "message", nil)
 	setTitleOp := NewSetTitleOp(rene, time.Now().Unix(), "title2", "title1")
 	addCommentOp := NewAddCommentOp(rene, time.Now().Unix(), "message2", nil)
@@ -77,35 +87,33 @@ func TestBugCommitLoad(t *testing.T) {
 	bug1.Append(createOp)
 	bug1.Append(setTitleOp)
 
-	repo := repository.NewMockRepoForTest()
-
-	assert.True(t, bug1.NeedCommit())
+	require.True(t, bug1.NeedCommit())
 
-	err := bug1.Commit(repo)
-	assert.Nil(t, err)
-	assert.False(t, bug1.NeedCommit())
+	err = bug1.Commit(repo)
+	require.Nil(t, err)
+	require.False(t, bug1.NeedCommit())
 
-	bug2, err := ReadLocalBug(repo, bug1.Id())
-	assert.NoError(t, err)
+	bug2, err := ReadLocal(repo, bug1.Id())
+	require.NoError(t, err)
 	equivalentBug(t, bug1, bug2)
 
 	// add more op
 
 	bug1.Append(addCommentOp)
 
-	assert.True(t, bug1.NeedCommit())
+	require.True(t, bug1.NeedCommit())
 
 	err = bug1.Commit(repo)
-	assert.Nil(t, err)
-	assert.False(t, bug1.NeedCommit())
+	require.Nil(t, err)
+	require.False(t, bug1.NeedCommit())
 
-	bug3, err := ReadLocalBug(repo, bug1.Id())
-	assert.NoError(t, err)
+	bug3, err := ReadLocal(repo, bug1.Id())
+	require.NoError(t, err)
 	equivalentBug(t, bug1, bug3)
 }
 
 func equivalentBug(t *testing.T, expected, actual *Bug) {
-	assert.Equal(t, len(expected.packs), len(actual.packs))
+	require.Equal(t, len(expected.packs), len(actual.packs))
 
 	for i := range expected.packs {
 		for j := range expected.packs[i].Operations {
@@ -113,7 +121,7 @@ func equivalentBug(t *testing.T, expected, actual *Bug) {
 		}
 	}
 
-	assert.Equal(t, expected, actual)
+	require.Equal(t, expected, actual)
 }
 
 func TestBugRemove(t *testing.T) {
@@ -163,13 +171,13 @@ func TestBugRemove(t *testing.T) {
 	err = RemoveBug(repo, b.Id())
 	require.NoError(t, err)
 
-	_, err = ReadLocalBug(repo, b.Id())
+	_, err = ReadLocal(repo, b.Id())
 	require.Error(t, ErrBugNotExist, err)
 
-	_, err = ReadRemoteBug(repo, "remoteA", b.Id())
+	_, err = ReadRemote(repo, "remoteA", b.Id())
 	require.Error(t, ErrBugNotExist, err)
 
-	_, err = ReadRemoteBug(repo, "remoteB", b.Id())
+	_, err = ReadRemote(repo, "remoteB", b.Id())
 	require.Error(t, ErrBugNotExist, err)
 
 	ids, err := ListLocalIds(repo)
diff --git a/bug/clocks.go b/bug/clocks.go
index ba93e0dc..58fce923 100644
--- a/bug/clocks.go
+++ b/bug/clocks.go
@@ -1,6 +1,7 @@
 package bug
 
 import (
+	"github.com/MichaelMure/git-bug/identity"
 	"github.com/MichaelMure/git-bug/repository"
 )
 
@@ -8,7 +9,9 @@ import (
 var ClockLoader = repository.ClockLoader{
 	Clocks: []string{creationClockName, editClockName},
 	Witnesser: func(repo repository.ClockedRepo) error {
-		for b := range ReadAllLocalBugs(repo) {
+		// We don't care about the actual identity so an IdentityStub will do
+		resolver := identity.NewStubResolver()
+		for b := range ReadAllLocalWithResolver(repo, resolver) {
 			if b.Err != nil {
 				return b.Err
 			}
diff --git a/bug/operation_iterator_test.go b/bug/operation_iterator_test.go
index fcc61d0f..5d245185 100644
--- a/bug/operation_iterator_test.go
+++ b/bug/operation_iterator_test.go
@@ -5,7 +5,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 
 	"github.com/MichaelMure/git-bug/identity"
 	"github.com/MichaelMure/git-bug/repository"
@@ -28,6 +28,9 @@ func TestOpIterator(t *testing.T) {
 	mockRepo := repository.NewMockRepoForTest()
 
 	rene := identity.NewIdentity("René Descartes", "rene@descartes.fr")
+	err := rene.Commit(mockRepo)
+	require.NoError(t, err)
+
 	unix := time.Now().Unix()
 
 	createOp := NewCreateOp(rene, unix, "title", "message", nil)
@@ -48,15 +51,15 @@ func TestOpIterator(t *testing.T) {
 	bug1.Append(addCommentOp)
 	bug1.Append(setStatusOp)
 	bug1.Append(labelChangeOp)
-	err := bug1.Commit(mockRepo)
-	assert.NoError(t, err)
+	err = bug1.Commit(mockRepo)
+	require.NoError(t, err)
 
 	// second pack
 	bug1.Append(genTitleOp())
 	bug1.Append(genTitleOp())
 	bug1.Append(genTitleOp())
 	err = bug1.Commit(mockRepo)
-	assert.NoError(t, err)
+	require.NoError(t, err)
 
 	// staging
 	bug1.Append(genTitleOp())
@@ -71,5 +74,5 @@ func TestOpIterator(t *testing.T) {
 		counter++
 	}
 
-	assert.Equal(t, 10, counter)
+	require.Equal(t, 10, counter)
 }
diff --git a/bug/operation_pack.go b/bug/operation_pack.go
index 58c8381c..6a134b94 100644
--- a/bug/operation_pack.go
+++ b/bug/operation_pack.go
@@ -143,10 +143,11 @@ func (opp *OperationPack) Write(repo repository.ClockedRepo) (repository.Hash, e
 	}
 
 	// First, make sure that all the identities are properly Commit as well
+	// TODO: this might be downgraded to "make sure it exist in git" but then, what make
+	// sure no data is lost on identities ?
 	for _, op := range opp.Operations {
-		err := op.base().Author.CommitAsNeeded(repo)
-		if err != nil {
-			return "", err
+		if op.base().Author.NeedCommit() {
+			return "", fmt.Errorf("identity need commmit")
 		}
 	}
 
diff --git a/bug/operation_test.go b/bug/operation_test.go
index 21ae5eff..64bff41f 100644
--- a/bug/operation_test.go
+++ b/bug/operation_test.go
@@ -106,7 +106,7 @@ func TestID(t *testing.T) {
 
 		require.Equal(t, id1, id2)
 
-		b2, err := ReadLocalBug(repo, b.Id())
+		b2, err := ReadLocal(repo, b.Id())
 		require.Nil(t, err)
 
 		op3 := b2.FirstOp()