From 81f5c3e0af9aa4b81662e0781289189703324986 Mon Sep 17 00:00:00 2001
From: Michael Muré <batolettre@gmail.com>
Date: Mon, 3 Feb 2020 21:03:48 +0100
Subject: graphql: use the cache in priority for fast browsing at < 20ms
 instead of seconds

---
 graphql/models/lazy_bug.go | 214 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 214 insertions(+)
 create mode 100644 graphql/models/lazy_bug.go

(limited to 'graphql/models/lazy_bug.go')

diff --git a/graphql/models/lazy_bug.go b/graphql/models/lazy_bug.go
new file mode 100644
index 00000000..b02f781c
--- /dev/null
+++ b/graphql/models/lazy_bug.go
@@ -0,0 +1,214 @@
+package models
+
+import (
+	"sync"
+	"time"
+
+	"github.com/MichaelMure/git-bug/bug"
+	"github.com/MichaelMure/git-bug/cache"
+	"github.com/MichaelMure/git-bug/entity"
+)
+
+type BugWrapper interface {
+	Id() entity.Id
+	LastEdit() time.Time
+	Status() bug.Status
+	Title() string
+	Comments() ([]bug.Comment, error)
+	Labels() []bug.Label
+	Author() (IdentityWrapper, error)
+	Actors() ([]IdentityWrapper, error)
+	Participants() ([]IdentityWrapper, error)
+	CreatedAt() time.Time
+	Timeline() ([]bug.TimelineItem, error)
+	Operations() ([]bug.Operation, error)
+
+	IsAuthored()
+}
+
+var _ BugWrapper = &LazyBug{}
+
+type LazyBug struct {
+	cache   *cache.RepoCache
+	excerpt *cache.BugExcerpt
+
+	mu   sync.Mutex
+	snap *bug.Snapshot
+}
+
+func NewLazyBug(cache *cache.RepoCache, excerpt *cache.BugExcerpt) *LazyBug {
+	return &LazyBug{
+		cache:   cache,
+		excerpt: excerpt,
+	}
+}
+
+func (lb *LazyBug) load() error {
+	if lb.snap != nil {
+		return nil
+	}
+
+	lb.mu.Lock()
+	defer lb.mu.Unlock()
+
+	b, err := lb.cache.ResolveBug(lb.excerpt.Id)
+	if err != nil {
+		return err
+	}
+
+	lb.snap = b.Snapshot()
+	return nil
+}
+
+func (lb *LazyBug) identity(id entity.Id) (IdentityWrapper, error) {
+	i, err := lb.cache.ResolveIdentityExcerpt(id)
+	if err != nil {
+		return nil, err
+	}
+	return &LazyIdentity{cache: lb.cache, excerpt: i}, nil
+}
+
+// Sign post method for gqlgen
+func (lb *LazyBug) IsAuthored() {}
+
+func (lb *LazyBug) Id() entity.Id {
+	return lb.excerpt.Id
+}
+
+func (lb *LazyBug) LastEdit() time.Time {
+	return time.Unix(lb.excerpt.EditUnixTime, 0)
+}
+
+func (lb *LazyBug) Status() bug.Status {
+	return lb.excerpt.Status
+}
+
+func (lb *LazyBug) Title() string {
+	return lb.excerpt.Title
+}
+
+func (lb *LazyBug) Comments() ([]bug.Comment, error) {
+	err := lb.load()
+	if err != nil {
+		return nil, err
+	}
+	return lb.snap.Comments, nil
+}
+
+func (lb *LazyBug) Labels() []bug.Label {
+	return lb.excerpt.Labels
+}
+
+func (lb *LazyBug) Author() (IdentityWrapper, error) {
+	return lb.identity(lb.excerpt.AuthorId)
+}
+
+func (lb *LazyBug) Actors() ([]IdentityWrapper, error) {
+	result := make([]IdentityWrapper, len(lb.excerpt.Actors))
+	for i, actorId := range lb.excerpt.Actors {
+		actor, err := lb.identity(actorId)
+		if err != nil {
+			return nil, err
+		}
+		result[i] = actor
+	}
+	return result, nil
+}
+
+func (lb *LazyBug) Participants() ([]IdentityWrapper, error) {
+	result := make([]IdentityWrapper, len(lb.excerpt.Participants))
+	for i, participantId := range lb.excerpt.Participants {
+		participant, err := lb.identity(participantId)
+		if err != nil {
+			return nil, err
+		}
+		result[i] = participant
+	}
+	return result, nil
+}
+
+func (lb *LazyBug) CreatedAt() time.Time {
+	return time.Unix(lb.excerpt.CreateUnixTime, 0)
+}
+
+func (lb *LazyBug) Timeline() ([]bug.TimelineItem, error) {
+	err := lb.load()
+	if err != nil {
+		return nil, err
+	}
+	return lb.snap.Timeline, nil
+}
+
+func (lb *LazyBug) Operations() ([]bug.Operation, error) {
+	err := lb.load()
+	if err != nil {
+		return nil, err
+	}
+	result := make([]bug.Operation, len(lb.snap.Operations))
+	for i, operation := range lb.snap.Operations {
+		result[i] = operation
+	}
+	return result, nil
+}
+
+var _ BugWrapper = &LoadedBug{}
+
+type LoadedBug struct {
+	*bug.Snapshot
+}
+
+func NewLoadedBug(snap *bug.Snapshot) *LoadedBug {
+	return &LoadedBug{Snapshot: snap}
+}
+
+func (l *LoadedBug) LastEdit() time.Time {
+	return l.Snapshot.LastEditTime()
+}
+
+func (l *LoadedBug) Status() bug.Status {
+	return l.Snapshot.Status
+}
+
+func (l *LoadedBug) Title() string {
+	return l.Snapshot.Title
+}
+
+func (l *LoadedBug) Comments() ([]bug.Comment, error) {
+	return l.Snapshot.Comments, nil
+}
+
+func (l *LoadedBug) Labels() []bug.Label {
+	return l.Snapshot.Labels
+}
+
+func (l *LoadedBug) Author() (IdentityWrapper, error) {
+	return NewLoadedIdentity(l.Snapshot.Author), nil
+}
+
+func (l *LoadedBug) Actors() ([]IdentityWrapper, error) {
+	res := make([]IdentityWrapper, len(l.Snapshot.Actors))
+	for i, actor := range l.Snapshot.Actors {
+		res[i] = NewLoadedIdentity(actor)
+	}
+	return res, nil
+}
+
+func (l *LoadedBug) Participants() ([]IdentityWrapper, error) {
+	res := make([]IdentityWrapper, len(l.Snapshot.Participants))
+	for i, participant := range l.Snapshot.Participants {
+		res[i] = NewLoadedIdentity(participant)
+	}
+	return res, nil
+}
+
+func (l *LoadedBug) CreatedAt() time.Time {
+	return l.Snapshot.CreatedAt
+}
+
+func (l *LoadedBug) Timeline() ([]bug.TimelineItem, error) {
+	return l.Snapshot.Timeline, nil
+}
+
+func (l *LoadedBug) Operations() ([]bug.Operation, error) {
+	return l.Snapshot.Operations, nil
+}
-- 
cgit