forked from moby/buildkit
/
bridge.go
213 lines (197 loc) · 5.86 KB
/
bridge.go
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package llbsolver
import (
"context"
"fmt"
"io"
"strings"
"sync"
"github.com/containerd/containerd/platforms"
"github.com/docker/distribution/reference"
"github.com/moby/buildkit/cache"
"github.com/moby/buildkit/cache/remotecache"
"github.com/moby/buildkit/executor"
"github.com/moby/buildkit/frontend"
gw "github.com/moby/buildkit/frontend/gateway/client"
"github.com/moby/buildkit/solver"
"github.com/moby/buildkit/util/tracing"
"github.com/moby/buildkit/worker"
digest "github.com/opencontainers/go-digest"
specs "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
)
type llbBridge struct {
builder solver.Builder
frontends map[string]frontend.Frontend
resolveWorker func() (worker.Worker, error)
resolveCacheImporter remotecache.ResolveCacheImporterFunc
cms map[string]solver.CacheManager
cmsMu sync.Mutex
platforms []specs.Platform
}
func (b *llbBridge) Solve(ctx context.Context, req frontend.SolveRequest) (res *frontend.Result, err error) {
w, err := b.resolveWorker()
if err != nil {
return nil, err
}
var cms []solver.CacheManager
for _, ref := range req.ImportCacheRefs {
b.cmsMu.Lock()
var cm solver.CacheManager
if prevCm, ok := b.cms[ref]; !ok {
r, err := reference.ParseNormalizedNamed(ref)
if err != nil {
return nil, err
}
ref = reference.TagNameOnly(r).String()
func(ref string) {
cm = newLazyCacheManager(ref, func() (solver.CacheManager, error) {
var cmNew solver.CacheManager
if err := inVertexContext(b.builder.Context(ctx), "importing cache manifest from "+ref, "", func(ctx context.Context) error {
if b.resolveCacheImporter == nil {
return errors.New("no cache importer is available")
}
typ := "" // TODO: support non-registry type
ci, desc, err := b.resolveCacheImporter(ctx, typ, ref)
if err != nil {
return err
}
cmNew, err = ci.Resolve(ctx, desc, ref, w)
return err
}); err != nil {
return nil, err
}
return cmNew, nil
})
}(ref)
b.cms[ref] = cm
} else {
cm = prevCm
}
cms = append(cms, cm)
b.cmsMu.Unlock()
}
if req.Definition != nil && req.Definition.Def != nil && req.Frontend != "" {
return nil, errors.New("cannot solve with both Definition and Frontend specified")
}
if req.Definition != nil && req.Definition.Def != nil {
ent, err := loadEntitlements(b.builder)
if err != nil {
return nil, err
}
edge, err := Load(req.Definition, ValidateEntitlements(ent), WithCacheSources(cms), RuntimePlatforms(b.platforms), WithValidateCaps())
if err != nil {
return nil, err
}
ref, err := b.builder.Build(ctx, edge)
if err != nil {
return nil, err
}
res = &frontend.Result{Ref: ref}
} else if req.Frontend != "" {
f, ok := b.frontends[req.Frontend]
if !ok {
return nil, errors.Errorf("invalid frontend: %s", req.Frontend)
}
res, err = f.Solve(ctx, b, req.FrontendOpt)
if err != nil {
return nil, err
}
} else {
return &frontend.Result{}, nil
}
if err := res.EachRef(func(r solver.CachedResult) error {
wr, ok := r.Sys().(*worker.WorkerRef)
if !ok {
return errors.Errorf("invalid reference for exporting: %T", r.Sys())
}
if wr.ImmutableRef != nil {
if err := wr.ImmutableRef.Finalize(ctx, false); err != nil {
return err
}
}
return nil
}); err != nil {
return nil, err
}
return
}
func (s *llbBridge) Exec(ctx context.Context, meta executor.Meta, root cache.ImmutableRef, stdin io.ReadCloser, stdout, stderr io.WriteCloser) (err error) {
w, err := s.resolveWorker()
if err != nil {
return err
}
span, ctx := tracing.StartSpan(ctx, strings.Join(meta.Args, " "))
err = w.Exec(ctx, meta, root, stdin, stdout, stderr)
tracing.FinishWithError(span, err)
return err
}
func (s *llbBridge) ResolveImageConfig(ctx context.Context, ref string, opt gw.ResolveImageConfigOpt) (dgst digest.Digest, config []byte, err error) {
w, err := s.resolveWorker()
if err != nil {
return "", nil, err
}
if opt.LogName == "" {
opt.LogName = fmt.Sprintf("resolve image config for %s", ref)
}
id := ref // make a deterministic ID for avoiding duplicates
if platform := opt.Platform; platform == nil {
id += platforms.Format(platforms.DefaultSpec())
} else {
id += platforms.Format(*platform)
}
err = inVertexContext(s.builder.Context(ctx), opt.LogName, id, func(ctx context.Context) error {
dgst, config, err = w.ResolveImageConfig(ctx, ref, opt)
return err
})
return dgst, config, err
}
type lazyCacheManager struct {
id string
main solver.CacheManager
waitCh chan struct{}
err error
}
func (lcm *lazyCacheManager) ID() string {
return lcm.id
}
func (lcm *lazyCacheManager) Query(inp []solver.CacheKeyWithSelector, inputIndex solver.Index, dgst digest.Digest, outputIndex solver.Index) ([]*solver.CacheKey, error) {
if err := lcm.wait(); err != nil {
return nil, err
}
return lcm.main.Query(inp, inputIndex, dgst, outputIndex)
}
func (lcm *lazyCacheManager) Records(ck *solver.CacheKey) ([]*solver.CacheRecord, error) {
if err := lcm.wait(); err != nil {
return nil, err
}
return lcm.main.Records(ck)
}
func (lcm *lazyCacheManager) Load(ctx context.Context, rec *solver.CacheRecord) (solver.Result, error) {
if err := lcm.wait(); err != nil {
return nil, err
}
return lcm.main.Load(ctx, rec)
}
func (lcm *lazyCacheManager) Save(key *solver.CacheKey, s solver.Result) (*solver.ExportableCacheKey, error) {
if err := lcm.wait(); err != nil {
return nil, err
}
return lcm.main.Save(key, s)
}
func (lcm *lazyCacheManager) wait() error {
<-lcm.waitCh
return lcm.err
}
func newLazyCacheManager(id string, fn func() (solver.CacheManager, error)) solver.CacheManager {
lcm := &lazyCacheManager{id: id, waitCh: make(chan struct{})}
go func() {
defer close(lcm.waitCh)
cm, err := fn()
if err != nil {
lcm.err = err
return
}
lcm.main = cm
}()
return lcm
}