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buildkit.go
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buildkit.go
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package imgsrc
import (
"crypto/rand"
"crypto/sha256"
"encoding/hex"
"encoding/json"
"fmt"
"os"
"path/filepath"
"strconv"
"github.com/docker/docker/api/types"
dockerclient "github.com/docker/docker/client"
"github.com/docker/docker/pkg/jsonmessage"
controlapi "github.com/moby/buildkit/api/services/control"
buildkitClient "github.com/moby/buildkit/client"
"github.com/moby/buildkit/session"
"github.com/moby/buildkit/session/auth"
"github.com/pkg/errors"
"github.com/spf13/viper"
"github.com/superfly/flyctl/flyctl"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
func buildkitEnabled(docker *dockerclient.Client) (buildkitEnabled bool, err error) {
ping, err := docker.Ping(context.Background())
if err != nil {
return false, err
}
buildkitEnabled = ping.BuilderVersion == types.BuilderBuildKit
if buildkitEnv := os.Getenv("DOCKER_BUILDKIT"); buildkitEnv != "" {
buildkitEnabled, err = strconv.ParseBool(buildkitEnv)
if err != nil {
return false, errors.Wrap(err, "DOCKER_BUILDKIT environment variable expects boolean value")
}
}
return buildkitEnabled, nil
}
func createBuildSession(contextDir string) (*session.Session, error) {
sharedKey := getBuildSharedKey(contextDir)
s, err := session.NewSession(context.Background(), filepath.Base(contextDir), sharedKey)
if err != nil {
return nil, errors.Wrap(err, "failed to create session")
}
return s, nil
}
func getBuildSharedKey(dir string) string {
// build session is hash of build dir with node based randomness
s := sha256.Sum256([]byte(fmt.Sprintf("%s:%s", getBuildNodeID(), dir)))
return hex.EncodeToString(s[:])
}
func getBuildNodeID() string {
buildNodeID := viper.GetString(flyctl.BuildKitNodeID)
if buildNodeID == "" {
b := make([]byte, 32)
if _, err := rand.Read(b); err != nil {
return flyctl.ConfigDir()
}
buildNodeID = hex.EncodeToString(b)
viper.Set(flyctl.BuildKitNodeID, buildNodeID)
if err := flyctl.SaveConfig(); err != nil {
fmt.Println("error writing config", err)
return flyctl.ConfigDir()
}
}
return buildNodeID
}
type tracer struct {
displayCh chan *buildkitClient.SolveStatus
}
func newTracer() *tracer {
return &tracer{
displayCh: make(chan *buildkitClient.SolveStatus),
}
}
func (t *tracer) write(msg jsonmessage.JSONMessage) {
var resp controlapi.StatusResponse
if msg.ID != "moby.buildkit.trace" {
return
}
var dt []byte
// ignoring all messages that are not understood
if err := json.Unmarshal(*msg.Aux, &dt); err != nil {
return
}
if err := (&resp).Unmarshal(dt); err != nil {
return
}
s := buildkitClient.SolveStatus{}
for _, v := range resp.Vertexes {
s.Vertexes = append(s.Vertexes, &buildkitClient.Vertex{
Digest: v.Digest,
Inputs: v.Inputs,
Name: v.Name,
Started: v.Started,
Completed: v.Completed,
Error: v.Error,
Cached: v.Cached,
})
}
for _, v := range resp.Statuses {
s.Statuses = append(s.Statuses, &buildkitClient.VertexStatus{
ID: v.ID,
Vertex: v.Vertex,
Name: v.Name,
Total: v.Total,
Current: v.Current,
Timestamp: v.Timestamp,
Started: v.Started,
Completed: v.Completed,
})
}
for _, v := range resp.Logs {
s.Logs = append(s.Logs, &buildkitClient.VertexLog{
Vertex: v.Vertex,
Stream: int(v.Stream),
Data: v.Msg,
Timestamp: v.Timestamp,
})
}
t.displayCh <- &s
}
func newBuildkitAuthProvider() session.Attachable {
return &buildkitAuthProvider{}
}
type buildkitAuthProvider struct{}
func (ap *buildkitAuthProvider) Register(server *grpc.Server) {
auth.RegisterAuthServer(server, ap)
}
func (ap *buildkitAuthProvider) Credentials(ctx context.Context, req *auth.CredentialsRequest) (*auth.CredentialsResponse, error) {
auths := authConfigs()
res := &auth.CredentialsResponse{}
if a, ok := auths[req.Host]; ok {
res.Username = a.Username
res.Secret = a.Password
}
return res, nil
}
func (ap *buildkitAuthProvider) FetchToken(ctx context.Context, req *auth.FetchTokenRequest) (*auth.FetchTokenResponse, error) {
return nil, status.Errorf(codes.Unavailable, "client side tokens disabled")
}
func (ap *buildkitAuthProvider) GetTokenAuthority(ctx context.Context, req *auth.GetTokenAuthorityRequest) (*auth.GetTokenAuthorityResponse, error) {
return nil, status.Errorf(codes.Unavailable, "client side tokens disabled")
}
func (ap *buildkitAuthProvider) VerifyTokenAuthority(ctx context.Context, req *auth.VerifyTokenAuthorityRequest) (*auth.VerifyTokenAuthorityResponse, error) {
return nil, status.Errorf(codes.Unavailable, "client side tokens disabled")
}