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builtin.go
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builtin.go
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package catalog
import (
"context"
"errors"
"io"
"sync"
"time"
"github.com/sirupsen/logrus"
"github.com/spiffe/spire-plugin-sdk/pluginsdk"
"github.com/spiffe/spire-plugin-sdk/private"
"github.com/spiffe/spire/pkg/common/log"
"github.com/zeebo/errs"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
)
type BuiltIn struct {
Name string
Plugin pluginsdk.PluginServer
Services []pluginsdk.ServiceServer
}
func MakeBuiltIn(name string, pluginServer pluginsdk.PluginServer, serviceServers ...pluginsdk.ServiceServer) BuiltIn {
return BuiltIn{
Name: name,
Plugin: pluginServer,
Services: serviceServers,
}
}
type BuiltInConfig struct {
// Log is the logger to be wired to the external plugin.
Log logrus.FieldLogger
// HostServices are the host service servers provided to the plugin.
HostServices []pluginsdk.ServiceServer
}
func LoadBuiltIn(ctx context.Context, builtIn BuiltIn, config BuiltInConfig) (_ Plugin, err error) {
return loadBuiltIn(ctx, builtIn, config)
}
func loadBuiltIn(ctx context.Context, builtIn BuiltIn, config BuiltInConfig) (_ *pluginImpl, err error) {
logger := log.NewHCLogAdapter(
config.Log,
builtIn.Name,
)
dialer := &builtinDialer{
pluginName: builtIn.Name,
log: config.Log,
hostServices: config.HostServices,
}
var closers closerGroup
defer func() {
if err != nil {
closers.Close()
}
}()
closers = append(closers, dialer)
builtinServer, serverCloser := newBuiltInServer()
closers = append(closers, serverCloser)
pluginServers := append([]pluginsdk.ServiceServer{builtIn.Plugin}, builtIn.Services...)
private.Register(builtinServer, pluginServers, logger, dialer)
builtinConn, err := startPipeServer(builtinServer, config.Log)
if err != nil {
return nil, err
}
closers = append(closers, builtinConn)
info := pluginInfo{
name: builtIn.Name,
typ: builtIn.Plugin.Type(),
}
return newPlugin(ctx, builtinConn, info, config.Log, closers, config.HostServices)
}
func newBuiltInServer() (*grpc.Server, io.Closer) {
drain := &drainHandlers{}
return grpc.NewServer(
grpc.ChainStreamInterceptor(drain.StreamServerInterceptor, streamPanicInterceptor),
grpc.ChainUnaryInterceptor(drain.UnaryServerInterceptor, unaryPanicInterceptor),
), closerFunc(drain.Wait)
}
type builtinDialer struct {
pluginName string
log logrus.FieldLogger
hostServices []pluginsdk.ServiceServer
conn *pipeConn
}
func (d *builtinDialer) DialHost(context.Context) (grpc.ClientConnInterface, error) {
if d.conn != nil {
return d.conn, nil
}
server := newHostServer(d.pluginName, d.hostServices)
conn, err := startPipeServer(server, d.log)
if err != nil {
return nil, err
}
d.conn = conn
return d.conn, nil
}
func (d *builtinDialer) Close() error {
if d.conn != nil {
return d.conn.Close()
}
return nil
}
type pipeConn struct {
grpc.ClientConnInterface
io.Closer
}
func startPipeServer(server *grpc.Server, log logrus.FieldLogger) (_ *pipeConn, err error) {
var closers closerGroup
pipeNet := newPipeNet()
closers = append(closers, pipeNet)
var wg sync.WaitGroup
closers = append(closers, closerFunc(wg.Wait), closerFunc(func() {
if !gracefulStopWithTimeout(server) {
log.Warn("Forced timed-out plugin server to stop")
}
}))
wg.Add(1)
go func() {
defer wg.Done()
if err := server.Serve(pipeNet); err != nil && !errors.Is(err, grpc.ErrServerStopped) {
log.WithError(err).Error("Pipe server unexpectedly failed to serve")
}
}()
// Dial the server
conn, err := grpc.Dial("IGNORED", grpc.WithBlock(), grpc.WithTransportCredentials(insecure.NewCredentials()), grpc.WithContextDialer(pipeNet.DialContext))
if err != nil {
return nil, errs.Wrap(err)
}
closers = append(closers, conn)
return &pipeConn{
ClientConnInterface: conn,
Closer: closers,
}, nil
}
type drainHandlers struct {
wg sync.WaitGroup
}
func (d *drainHandlers) Wait() {
done := make(chan struct{})
go func() {
d.wg.Wait()
close(done)
}()
t := time.NewTimer(time.Minute)
defer t.Stop()
select {
case <-done:
case <-t.C:
}
}
func (d *drainHandlers) UnaryServerInterceptor(ctx context.Context, req any, _ *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (any, error) {
d.wg.Add(1)
defer d.wg.Done()
return handler(ctx, req)
}
func (d *drainHandlers) StreamServerInterceptor(srv any, ss grpc.ServerStream, _ *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
d.wg.Add(1)
defer d.wg.Done()
return handler(srv, ss)
}