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|
package cache
import (
"fmt"
"strings"
"github.com/MichaelMure/git-bug/bug"
"github.com/MichaelMure/git-bug/repository"
)
type Cacher interface {
RegisterRepository(ref string, repo repository.Repo)
RegisterDefaultRepository(repo repository.Repo)
ResolveRepo(ref string) (RepoCacher, error)
DefaultRepo() (RepoCacher, error)
// Shortcut to resolve on the default repo for convenience
DefaultResolveBug(id string) (BugCacher, error)
DefaultResolveBugPrefix(prefix string) (BugCacher, error)
}
type RepoCacher interface {
ResolveBug(id string) (BugCacher, error)
ResolveBugPrefix(prefix string) (BugCacher, error)
ClearAllBugs()
}
type BugCacher interface {
Snapshot() *bug.Snapshot
ClearSnapshot()
}
// Cacher ------------------------
type RootCache struct {
repos map[string]RepoCacher
}
func NewCache() RootCache {
return RootCache{
repos: make(map[string]RepoCacher),
}
}
func (c *RootCache) RegisterRepository(ref string, repo repository.Repo) {
c.repos[ref] = NewRepoCache(repo)
}
func (c *RootCache) RegisterDefaultRepository(repo repository.Repo) {
c.repos[""] = NewRepoCache(repo)
}
func (c *RootCache) DefaultRepo() (RepoCacher, error) {
if len(c.repos) != 1 {
return nil, fmt.Errorf("repository is not unique")
}
for _, r := range c.repos {
return r, nil
}
panic("unreachable")
}
func (c *RootCache) ResolveRepo(ref string) (RepoCacher, error) {
r, ok := c.repos[ref]
if !ok {
return nil, fmt.Errorf("unknown repo")
}
return r, nil
}
func (c *RootCache) DefaultResolveBug(id string) (BugCacher, error) {
repo, err := c.DefaultRepo()
if err != nil {
return nil, err
}
return repo.ResolveBug(id)
}
func (c *RootCache) DefaultResolveBugPrefix(prefix string) (BugCacher, error) {
repo, err := c.DefaultRepo()
if err != nil {
return nil, err
}
return repo.ResolveBugPrefix(prefix)
}
// Repo ------------------------
type RepoCache struct {
repo repository.Repo
bugs map[string]BugCacher
}
func NewRepoCache(r repository.Repo) RepoCacher {
return &RepoCache{
repo: r,
bugs: make(map[string]BugCacher),
}
}
func (c RepoCache) ResolveBug(id string) (BugCacher, error) {
cached, ok := c.bugs[id]
if ok {
return cached, nil
}
b, err := bug.ReadLocalBug(c.repo, id)
if err != nil {
return nil, err
}
cached = NewBugCache(b)
c.bugs[id] = cached
return cached, nil
}
func (c RepoCache) ResolveBugPrefix(prefix string) (BugCacher, error) {
// preallocate but empty
matching := make([]string, 0, 5)
for id := range c.bugs {
if strings.HasPrefix(id, prefix) {
matching = append(matching, id)
}
}
// TODO: should check matching bug in the repo as well
if len(matching) > 1 {
return nil, fmt.Errorf("Multiple matching bug found:\n%s", strings.Join(matching, "\n"))
}
if len(matching) == 1 {
b := c.bugs[matching[0]]
return b, nil
}
b, err := bug.FindLocalBug(c.repo, prefix)
if err != nil {
return nil, err
}
cached := NewBugCache(b)
c.bugs[b.Id()] = cached
return cached, nil
}
func (c RepoCache) ClearAllBugs() {
c.bugs = make(map[string]BugCacher)
}
// Bug ------------------------
type BugCache struct {
bug *bug.Bug
snap *bug.Snapshot
}
func NewBugCache(b *bug.Bug) BugCacher {
return &BugCache{
bug: b,
}
}
func (c BugCache) Snapshot() *bug.Snapshot {
if c.snap == nil {
snap := c.bug.Compile()
c.snap = &snap
}
return c.snap
}
func (c BugCache) ClearSnapshot() {
c.snap = nil
}
|
