Merge pull request #316 from MichaelMure/lazy-graphql

graphql: use the cache in priority for fast browsing in the WebUI

1 files changed, 167 insertions, 0 deletions

diff --git a/graphql/models/lazy_identity.go b/graphql/models/lazy_identity.go
new file mode 100644
index 00000000..bbd36be3
--- /dev/null
+++ b/graphql/models/lazy_identity.go
@@ -0,0 +1,167 @@
+package models
+
+import (
+	"fmt"
+	"sync"
+
+	"github.com/MichaelMure/git-bug/cache"
+	"github.com/MichaelMure/git-bug/entity"
+	"github.com/MichaelMure/git-bug/identity"
+	"github.com/MichaelMure/git-bug/util/lamport"
+	"github.com/MichaelMure/git-bug/util/timestamp"
+)
+
+// IdentityWrapper is an interface used by the GraphQL resolvers to handle an identity.
+// Depending on the situation, an Identity can already be fully loaded in memory or not.
+// This interface is used to wrap either a lazyIdentity or a loadedIdentity depending on the situation.
+type IdentityWrapper interface {
+	Id() entity.Id
+	Name() string
+	Email() (string, error)
+	AvatarUrl() (string, error)
+	Keys() ([]*identity.Key, error)
+	ValidKeysAtTime(time lamport.Time) ([]*identity.Key, error)
+	DisplayName() string
+	IsProtected() (bool, error)
+	LastModificationLamport() (lamport.Time, error)
+	LastModification() (timestamp.Timestamp, error)
+}
+
+var _ IdentityWrapper = &lazyIdentity{}
+
+type lazyIdentity struct {
+	cache   *cache.RepoCache
+	excerpt *cache.IdentityExcerpt
+
+	mu sync.Mutex
+	id *cache.IdentityCache
+}
+
+func NewLazyIdentity(cache *cache.RepoCache, excerpt *cache.IdentityExcerpt) *lazyIdentity {
+	return &lazyIdentity{
+		cache:   cache,
+		excerpt: excerpt,
+	}
+}
+
+func (li *lazyIdentity) load() (*cache.IdentityCache, error) {
+	if li.id != nil {
+		return li.id, nil
+	}
+
+	li.mu.Lock()
+	defer li.mu.Unlock()
+
+	id, err := li.cache.ResolveIdentity(li.excerpt.Id)
+	if err != nil {
+		return nil, fmt.Errorf("cache: missing identity %v", li.excerpt.Id)
+	}
+	li.id = id
+	return id, nil
+}
+
+func (li *lazyIdentity) Id() entity.Id {
+	return li.excerpt.Id
+}
+
+func (li *lazyIdentity) Name() string {
+	return li.excerpt.Name
+}
+
+func (li *lazyIdentity) Email() (string, error) {
+	id, err := li.load()
+	if err != nil {
+		return "", err
+	}
+	return id.Email(), nil
+}
+
+func (li *lazyIdentity) AvatarUrl() (string, error) {
+	id, err := li.load()
+	if err != nil {
+		return "", err
+	}
+	return id.AvatarUrl(), nil
+}
+
+func (li *lazyIdentity) Keys() ([]*identity.Key, error) {
+	id, err := li.load()
+	if err != nil {
+		return nil, err
+	}
+	return id.Keys(), nil
+}
+
+func (li *lazyIdentity) ValidKeysAtTime(time lamport.Time) ([]*identity.Key, error) {
+	id, err := li.load()
+	if err != nil {
+		return nil, err
+	}
+	return id.ValidKeysAtTime(time), nil
+}
+
+func (li *lazyIdentity) DisplayName() string {
+	return li.excerpt.DisplayName()
+}
+
+func (li *lazyIdentity) IsProtected() (bool, error) {
+	id, err := li.load()
+	if err != nil {
+		return false, err
+	}
+	return id.IsProtected(), nil
+}
+
+func (li *lazyIdentity) LastModificationLamport() (lamport.Time, error) {
+	id, err := li.load()
+	if err != nil {
+		return 0, err
+	}
+	return id.LastModificationLamport(), nil
+}
+
+func (li *lazyIdentity) LastModification() (timestamp.Timestamp, error) {
+	id, err := li.load()
+	if err != nil {
+		return 0, err
+	}
+	return id.LastModification(), nil
+}
+
+var _ IdentityWrapper = &loadedIdentity{}
+
+type loadedIdentity struct {
+	identity.Interface
+}
+
+func NewLoadedIdentity(id identity.Interface) *loadedIdentity {
+	return &loadedIdentity{Interface: id}
+}
+
+func (l loadedIdentity) Email() (string, error) {
+	return l.Interface.Email(), nil
+}
+
+func (l loadedIdentity) AvatarUrl() (string, error) {
+	return l.Interface.AvatarUrl(), nil
+}
+
+func (l loadedIdentity) Keys() ([]*identity.Key, error) {
+	return l.Interface.Keys(), nil
+}
+
+func (l loadedIdentity) ValidKeysAtTime(time lamport.Time) ([]*identity.Key, error) {
+	return l.Interface.ValidKeysAtTime(time), nil
+}
+
+func (l loadedIdentity) IsProtected() (bool, error) {
+	return l.Interface.IsProtected(), nil
+}
+
+func (l loadedIdentity) LastModificationLamport() (lamport.Time, error) {
+	return l.Interface.LastModificationLamport(), nil
+}
+
+func (l loadedIdentity) LastModification() (timestamp.Timestamp, error) {
+	return l.Interface.LastModification(), nil
+}