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buildkitcontroller.go
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buildkitcontroller.go
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package server
import (
"context"
"errors"
"fmt"
"io"
"runtime/debug"
"sync"
"time"
controlapi "github.com/moby/buildkit/api/services/control"
apitypes "github.com/moby/buildkit/api/types"
"github.com/moby/buildkit/cache/remotecache"
bkclient "github.com/moby/buildkit/client"
"github.com/moby/buildkit/executor/oci"
"github.com/moby/buildkit/frontend"
"github.com/moby/buildkit/session"
"github.com/moby/buildkit/session/grpchijack"
containerdsnapshot "github.com/moby/buildkit/snapshot/containerd"
"github.com/moby/buildkit/solver"
"github.com/moby/buildkit/solver/pb"
"github.com/moby/buildkit/util/bklog"
"github.com/moby/buildkit/util/entitlements"
"github.com/moby/buildkit/util/imageutil"
"github.com/moby/buildkit/util/leaseutil"
"github.com/moby/buildkit/util/throttle"
"github.com/moby/locker"
"github.com/sirupsen/logrus"
logsv1 "go.opentelemetry.io/proto/otlp/collector/logs/v1"
metricsv1 "go.opentelemetry.io/proto/otlp/collector/metrics/v1"
tracev1 "go.opentelemetry.io/proto/otlp/collector/trace/v1"
"golang.org/x/sync/errgroup"
"google.golang.org/grpc"
"github.com/dagger/dagger/engine"
"github.com/dagger/dagger/engine/buildkit"
"github.com/dagger/dagger/engine/slog"
"github.com/dagger/dagger/telemetry"
)
type BuildkitController struct {
BuildkitControllerOpts
genericSolver *solver.Solver
cacheManager solver.CacheManager
privilegedExecEnabled bool
// server id -> server
servers map[string]*DaggerServer
serverMu sync.RWMutex
perServerMu *locker.Locker
throttledGC func()
gcmu sync.Mutex
}
type BuildkitControllerOpts struct {
Worker *buildkit.Worker
SessionManager *session.Manager
CacheManager solver.CacheManager
ContentStore *containerdsnapshot.Store
LeaseManager *leaseutil.Manager
Entitlements []string
EngineName string
Frontends map[string]frontend.Frontend
TelemetryPubSub *telemetry.PubSub
UpstreamCacheExporters map[string]remotecache.ResolveCacheExporterFunc
UpstreamCacheImporters map[string]remotecache.ResolveCacheImporterFunc
DNSConfig *oci.DNSConfig
BuildkitLogSink io.Writer
}
func NewBuildkitController(opts BuildkitControllerOpts) (*BuildkitController, error) {
genericSolver := solver.NewSolver(solver.SolverOpt{
ResolveOpFunc: func(vtx solver.Vertex, builder solver.Builder) (solver.Op, error) {
var w *buildkit.Worker
if err := builder.EachValue(context.Background(), buildkit.DaggerWorkerJobKey,
func(v interface{}) error {
if w == nil {
w, _ = v.(*buildkit.Worker)
}
return nil
},
); err != nil {
return nil, fmt.Errorf("failed to get worker from job keys: %w", err)
}
if w == nil {
return nil, fmt.Errorf("worker not found in job keys")
}
// passing nil bridge since it's only needed for BuildOp, which is never used and
// never should be used (it's a legacy API)
return w.ResolveOp(vtx, nil, opts.SessionManager)
},
DefaultCache: opts.CacheManager,
})
e := &BuildkitController{
BuildkitControllerOpts: opts,
genericSolver: genericSolver,
cacheManager: opts.CacheManager,
servers: make(map[string]*DaggerServer),
perServerMu: locker.New(),
}
for _, entitlementStr := range opts.Entitlements {
if entitlementStr == string(entitlements.EntitlementSecurityInsecure) {
e.privilegedExecEnabled = true
}
}
e.throttledGC = throttle.After(time.Minute, e.gc)
defer func() {
time.AfterFunc(time.Second, e.throttledGC)
}()
return e, nil
}
func (e *BuildkitController) LogMetrics(l *logrus.Entry) *logrus.Entry {
e.serverMu.RLock()
defer e.serverMu.RUnlock()
l = l.WithField("dagger-server-count", len(e.servers))
for _, s := range e.servers {
l = s.LogMetrics(l)
}
return l
}
func (e *BuildkitController) Session(stream controlapi.Control_SessionServer) (rerr error) {
defer func() {
// a panic would indicate a bug, but we don't want to take down the entire server
if err := recover(); err != nil {
bklog.G(context.Background()).WithError(fmt.Errorf("%v", err)).Errorf("panic in session call")
debug.PrintStack()
rerr = fmt.Errorf("panic in session call, please report a bug: %v %s", err, string(debug.Stack()))
}
}()
ctx, cancel := context.WithCancel(stream.Context())
defer cancel()
opts, err := engine.ClientMetadataFromContext(ctx)
if err != nil {
bklog.G(ctx).WithError(err).Errorf("failed to get client metadata for session call")
return fmt.Errorf("failed to get client metadata for session call: %w", err)
}
ctx = bklog.WithLogger(ctx, bklog.G(ctx).
WithField("client_id", opts.ClientID).
WithField("client_hostname", opts.ClientHostname).
WithField("server_id", opts.ServerID))
{
lg := bklog.G(ctx).WithField("register_client", opts.RegisterClient)
lgLevel := lg.Trace
if opts.RegisterClient {
lgLevel = lg.Debug
}
lgLevel("handling session call")
defer func() {
if rerr != nil {
lg.WithError(rerr).Errorf("session call failed")
} else {
lgLevel("session call done")
}
}()
}
conn, _, hijackmd := grpchijack.Hijack(stream)
if !opts.RegisterClient {
// retry a few times since an initially connecting client is concurrently registering
// the server, so this it's okay for this to take a bit to succeed
srv, err := retry(ctx, 100*time.Millisecond, 20, func() (*DaggerServer, error) {
e.serverMu.RLock()
srv, ok := e.servers[opts.ServerID]
e.serverMu.RUnlock()
if !ok {
return nil, fmt.Errorf("server %q not found", opts.ServerID)
}
if err := srv.VerifyClient(opts.ClientID, opts.ClientSecretToken); err != nil {
return nil, fmt.Errorf("failed to verify client: %w", err)
}
return srv, nil
})
if err != nil {
return err
}
bklog.G(ctx).Trace("forwarding client to server")
err = srv.ServeClientConn(ctx, opts, conn)
if errors.Is(err, io.ErrClosedPipe) {
return nil
}
return fmt.Errorf("serve clientConn: %w", err)
}
bklog.G(ctx).Trace("registering client")
eg, egctx := errgroup.WithContext(ctx)
eg.Go(func() error {
// overwrite the session ID to be our client ID + server ID
const sessionIDHeader = "x-docker-expose-session-uuid"
if _, ok := hijackmd[sessionIDHeader]; !ok {
// should never happen unless upstream changes the value of the header key,
// in which case we want to know
panic(fmt.Errorf("missing header %s", sessionIDHeader))
}
hijackmd[sessionIDHeader] = []string{opts.BuildkitSessionID()}
bklog.G(ctx).Trace("session manager handling conn")
err := e.SessionManager.HandleConn(egctx, conn, hijackmd)
bklog.G(ctx).WithError(err).Trace("session manager handle conn done")
slog.Trace("session manager handle conn done", "err", err, "ctxErr", ctx.Err(), "egCtxErr", egctx.Err())
if err != nil {
return fmt.Errorf("handleConn: %w", err)
}
return nil
})
// NOTE: the perServerMu here is used to ensure that we hold a lock
// specific to only *this server*, so we don't allow creating multiple
// servers with the same ID at once. This complexity is necessary so we
// don't hold the global serverMu lock for longer than necessary.
e.perServerMu.Lock(opts.ServerID)
e.serverMu.RLock()
srv, ok := e.servers[opts.ServerID]
e.serverMu.RUnlock()
if !ok {
bklog.G(ctx).Trace("initializing new server")
srv, err = e.newDaggerServer(ctx, opts)
if err != nil {
e.perServerMu.Unlock(opts.ServerID)
return fmt.Errorf("new APIServer: %w", err)
}
e.serverMu.Lock()
e.servers[opts.ServerID] = srv
e.serverMu.Unlock()
bklog.G(ctx).Trace("initialized new server")
// delete the server after the initial client who created it exits
defer func() {
bklog.G(ctx).Trace("removing server")
e.serverMu.Lock()
delete(e.servers, opts.ServerID)
e.serverMu.Unlock()
if err := srv.Close(context.WithoutCancel(ctx)); err != nil {
bklog.G(ctx).WithError(err).Error("failed to close server")
}
time.AfterFunc(time.Second, e.throttledGC)
bklog.G(ctx).Trace("server removed")
}()
}
e.perServerMu.Unlock(opts.ServerID)
err = srv.RegisterClient(opts.ClientID, opts.ClientHostname, opts.ClientSecretToken)
if err != nil {
return fmt.Errorf("failed to register client: %w", err)
}
eg.Go(func() error {
bklog.G(ctx).Trace("waiting for server")
err := srv.Wait(egctx)
bklog.G(ctx).WithError(err).Trace("server done")
if err != nil {
return fmt.Errorf("srv.Wait: %w", err)
}
return nil
})
err = eg.Wait()
if errors.Is(err, context.Canceled) {
err = nil
}
if err != nil {
return fmt.Errorf("wait: %w", err)
}
return nil
}
func (e *BuildkitController) DiskUsage(ctx context.Context, r *controlapi.DiskUsageRequest) (*controlapi.DiskUsageResponse, error) {
resp := &controlapi.DiskUsageResponse{}
du, err := e.Worker.DiskUsage(ctx, bkclient.DiskUsageInfo{
Filter: r.Filter,
})
if err != nil {
return nil, err
}
for _, r := range du {
resp.Record = append(resp.Record, &controlapi.UsageRecord{
ID: r.ID,
Mutable: r.Mutable,
InUse: r.InUse,
Size_: r.Size,
Parents: r.Parents,
UsageCount: int64(r.UsageCount),
Description: r.Description,
CreatedAt: r.CreatedAt,
LastUsedAt: r.LastUsedAt,
RecordType: string(r.RecordType),
Shared: r.Shared,
})
}
return resp, nil
}
func (e *BuildkitController) Prune(req *controlapi.PruneRequest, stream controlapi.Control_PruneServer) error {
eg, ctx := errgroup.WithContext(stream.Context())
e.serverMu.RLock()
cancelLeases := len(e.servers) == 0
e.serverMu.RUnlock()
if cancelLeases {
imageutil.CancelCacheLeases()
}
didPrune := false
defer func() {
if didPrune {
if e, ok := e.cacheManager.(interface {
ReleaseUnreferenced(context.Context) error
}); ok {
if err := e.ReleaseUnreferenced(ctx); err != nil {
bklog.G(ctx).Errorf("failed to release cache metadata: %+v", err)
}
}
}
}()
ch := make(chan bkclient.UsageInfo, 32)
eg.Go(func() error {
defer close(ch)
return e.Worker.Prune(ctx, ch, bkclient.PruneInfo{
Filter: req.Filter,
All: req.All,
KeepDuration: time.Duration(req.KeepDuration),
KeepBytes: req.KeepBytes,
})
})
eg.Go(func() error {
defer func() {
// drain channel on error
for range ch {
}
}()
for r := range ch {
didPrune = true
if err := stream.Send(&controlapi.UsageRecord{
ID: r.ID,
Mutable: r.Mutable,
InUse: r.InUse,
Size_: r.Size,
Parents: r.Parents,
UsageCount: int64(r.UsageCount),
Description: r.Description,
CreatedAt: r.CreatedAt,
LastUsedAt: r.LastUsedAt,
RecordType: string(r.RecordType),
Shared: r.Shared,
}); err != nil {
return err
}
}
return nil
})
return eg.Wait()
}
func (e *BuildkitController) Info(ctx context.Context, r *controlapi.InfoRequest) (*controlapi.InfoResponse, error) {
return &controlapi.InfoResponse{
BuildkitVersion: &apitypes.BuildkitVersion{
Package: engine.Package,
Version: engine.Version,
Revision: e.EngineName,
},
}, nil
}
func (e *BuildkitController) ListWorkers(ctx context.Context, r *controlapi.ListWorkersRequest) (*controlapi.ListWorkersResponse, error) {
resp := &controlapi.ListWorkersResponse{
Record: []*apitypes.WorkerRecord{{
ID: e.Worker.ID(),
Labels: e.Worker.Labels(),
Platforms: pb.PlatformsFromSpec(e.Worker.Platforms(true)),
}},
}
return resp, nil
}
func (e *BuildkitController) Register(server *grpc.Server) {
controlapi.RegisterControlServer(server, e)
traceSrv := &telemetry.TraceServer{PubSub: e.TelemetryPubSub}
tracev1.RegisterTraceServiceServer(server, traceSrv)
telemetry.RegisterTracesSourceServer(server, traceSrv)
logsSrv := &telemetry.LogsServer{PubSub: e.TelemetryPubSub}
logsv1.RegisterLogsServiceServer(server, logsSrv)
telemetry.RegisterLogsSourceServer(server, logsSrv)
metricsSrv := &telemetry.MetricsServer{PubSub: e.TelemetryPubSub}
metricsv1.RegisterMetricsServiceServer(server, metricsSrv)
telemetry.RegisterMetricsSourceServer(server, metricsSrv)
}
func (e *BuildkitController) Close() error {
err := e.Worker.Close()
// note this *could* cause a panic in Session if it was still running, so
// the server should be shutdown first
e.serverMu.Lock()
servers := e.servers
e.servers = nil
e.serverMu.Unlock()
for _, s := range servers {
s.Close(context.Background())
}
return err
}
func (e *BuildkitController) gc() {
e.gcmu.Lock()
defer e.gcmu.Unlock()
ch := make(chan bkclient.UsageInfo)
eg, ctx := errgroup.WithContext(context.TODO())
var size int64
eg.Go(func() error {
for ui := range ch {
size += ui.Size
}
return nil
})
eg.Go(func() error {
defer close(ch)
if policy := e.Worker.GCPolicy(); len(policy) > 0 {
return e.Worker.Prune(ctx, ch, policy...)
}
return nil
})
err := eg.Wait()
if err != nil {
bklog.G(ctx).Errorf("gc error: %+v", err)
}
if size > 0 {
bklog.G(ctx).Debugf("gc cleaned up %d bytes", size)
}
}
func (e *BuildkitController) Solve(ctx context.Context, req *controlapi.SolveRequest) (*controlapi.SolveResponse, error) {
return nil, fmt.Errorf("solve not implemented")
}
func (e *BuildkitController) Status(req *controlapi.StatusRequest, stream controlapi.Control_StatusServer) error {
return fmt.Errorf("status not implemented")
}
func (e *BuildkitController) ListenBuildHistory(req *controlapi.BuildHistoryRequest, srv controlapi.Control_ListenBuildHistoryServer) error {
return fmt.Errorf("listen build history not implemented")
}
func (e *BuildkitController) UpdateBuildHistory(ctx context.Context, req *controlapi.UpdateBuildHistoryRequest) (*controlapi.UpdateBuildHistoryResponse, error) {
return nil, fmt.Errorf("update build history not implemented")
}
func retry[T any](ctx context.Context, interval time.Duration, maxRetries int, f func() (T, error)) (T, error) {
var err error
for i := 0; i < maxRetries; i++ {
var t T
t, err = f()
if err == nil {
return t, nil
}
select {
case <-time.After(interval):
case <-ctx.Done():
return t, ctx.Err()
}
}
var t T
return t, err
}