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pool.go
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pool.go
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package resolver
import (
"context"
"fmt"
"net/http"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/containerd/containerd/images"
"github.com/containerd/containerd/remotes"
"github.com/containerd/containerd/remotes/docker"
distreference "github.com/docker/distribution/reference"
"github.com/moby/buildkit/session"
"github.com/moby/buildkit/source"
"github.com/moby/buildkit/version"
ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
)
// DefaultPool is the default shared resolver pool instance
var DefaultPool = NewPool()
// Pool is a cache of recently used resolvers
type Pool struct {
mu sync.Mutex
m map[string]*authHandlerNS
}
// NewPool creates a new pool for caching resolvers
func NewPool() *Pool {
p := &Pool{
m: map[string]*authHandlerNS{},
}
time.AfterFunc(5*time.Minute, p.gc)
return p
}
func (p *Pool) gc() {
p.mu.Lock()
defer p.mu.Unlock()
for k, ns := range p.m {
ns.muHandlers.Lock()
for key, h := range ns.handlers {
if time.Since(h.lastUsed) < 10*time.Minute {
continue
}
parts := strings.SplitN(key, "/", 2)
if len(parts) != 2 {
delete(ns.handlers, key)
continue
}
c, err := ns.sm.Get(context.TODO(), parts[1], true)
if c == nil || err != nil {
delete(ns.handlers, key)
}
}
if len(ns.handlers) == 0 {
delete(p.m, k)
}
ns.muHandlers.Unlock()
}
time.AfterFunc(5*time.Minute, p.gc)
}
// Clear deletes currently cached items. This may be called on config changes for example.
func (p *Pool) Clear() {
p.mu.Lock()
defer p.mu.Unlock()
p.m = map[string]*authHandlerNS{}
}
// GetResolver gets a resolver for a specified scope from the pool
func (p *Pool) GetResolver(hosts docker.RegistryHosts, ref, scope string, sm *session.Manager, g session.Group) *Resolver {
name := ref
named, err := distreference.ParseNormalizedNamed(ref)
if err == nil {
name = named.Name()
}
key := fmt.Sprintf("%s::%s", name, scope)
p.mu.Lock()
defer p.mu.Unlock()
h, ok := p.m[key]
if !ok {
h = newAuthHandlerNS(sm)
p.m[key] = h
}
return newResolver(hosts, h, sm, g)
}
func newResolver(hosts docker.RegistryHosts, handler *authHandlerNS, sm *session.Manager, g session.Group) *Resolver {
if hosts == nil {
hosts = docker.ConfigureDefaultRegistries(
docker.WithClient(newDefaultClient()),
docker.WithPlainHTTP(docker.MatchLocalhost),
)
}
r := &Resolver{
hosts: hosts,
sm: sm,
g: g,
handler: handler,
}
headers := http.Header{}
headers.Set("User-Agent", version.UserAgent())
r.Resolver = docker.NewResolver(docker.ResolverOptions{
Hosts: r.HostsFunc,
Headers: headers,
})
return r
}
// Resolver is a wrapper around remotes.Resolver
type Resolver struct {
remotes.Resolver
hosts docker.RegistryHosts
sm *session.Manager
g session.Group
handler *authHandlerNS
auth *dockerAuthorizer
is images.Store
mode source.ResolveMode
}
// HostsFunc implements registry configuration of this Resolver
func (r *Resolver) HostsFunc(host string) ([]docker.RegistryHost, error) {
return func(domain string) ([]docker.RegistryHost, error) {
v, err := r.handler.g.Do(context.TODO(), domain, func(ctx context.Context) (interface{}, error) {
// long lock not needed because flightcontrol.Do
r.handler.muHosts.Lock()
v, ok := r.handler.hosts[domain]
r.handler.muHosts.Unlock()
if ok {
return v, nil
}
res, err := r.hosts(domain)
if err != nil {
return nil, err
}
r.handler.muHosts.Lock()
r.handler.hosts[domain] = res
r.handler.muHosts.Unlock()
return res, nil
})
if err != nil || v == nil {
return nil, err
}
vv := v.([]docker.RegistryHost)
if len(vv) == 0 {
return nil, nil
}
// make a copy so authorizer is set on unique instance
res := make([]docker.RegistryHost, len(vv))
copy(res, vv)
auth := newDockerAuthorizer(res[0].Client, r.handler, r.sm, r.g)
for i := range res {
res[i].Authorizer = auth
}
return res, nil
}(host)
}
// WithSession returns a new resolver that works with new session group
func (r *Resolver) WithSession(s session.Group) *Resolver {
r2 := *r
r2.auth = nil
r2.g = s
r2.Resolver = docker.NewResolver(docker.ResolverOptions{
Hosts: r2.HostsFunc, // this refers to the newly-configured session so we need to recreate the resolver.
})
return &r2
}
// WithImageStore returns new resolver that can also resolve from local images store
func (r *Resolver) WithImageStore(is images.Store, mode source.ResolveMode) *Resolver {
r2 := *r
r2.Resolver = r.Resolver
r2.is = is
r2.mode = mode
return &r2
}
// Fetcher returns a new fetcher for the provided reference.
func (r *Resolver) Fetcher(ctx context.Context, ref string) (remotes.Fetcher, error) {
if atomic.LoadInt64(&r.handler.counter) == 0 {
r.Resolve(ctx, ref)
}
return r.Resolver.Fetcher(ctx, ref)
}
// Resolve attempts to resolve the reference into a name and descriptor.
func (r *Resolver) Resolve(ctx context.Context, ref string) (string, ocispecs.Descriptor, error) {
if r.mode == source.ResolveModePreferLocal && r.is != nil {
if img, err := r.is.Get(ctx, ref); err == nil {
return ref, img.Target, nil
}
}
n, desc, err := r.Resolver.Resolve(ctx, ref)
if err == nil {
atomic.AddInt64(&r.handler.counter, 1)
return n, desc, nil
}
if r.mode == source.ResolveModeDefault && r.is != nil {
if img, err := r.is.Get(ctx, ref); err == nil {
return ref, img.Target, nil
}
}
return "", ocispecs.Descriptor{}, err
}