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plugin_gateway.go
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plugin_gateway.go
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package stream
import (
"context"
"errors"
"io"
"runtime"
"strings"
"github.com/hashicorp/go-plugin"
"github.com/jhump/protoreflect/grpcreflect"
"github.com/kralicky/totem"
"github.com/prometheus/client_golang/prometheus"
streamv1 "github.com/rancher/opni/pkg/apis/stream/v1"
"github.com/rancher/opni/pkg/auth/cluster"
"github.com/rancher/opni/pkg/logger"
"github.com/rancher/opni/pkg/plugins/apis/apiextensions"
"go.opentelemetry.io/otel/attribute"
otelprometheus "go.opentelemetry.io/otel/exporters/prometheus"
"go.opentelemetry.io/otel/sdk/metric"
"go.opentelemetry.io/otel/sdk/resource"
"go.uber.org/zap"
"google.golang.org/grpc/metadata"
)
type GatewayStreamApiExtensionPluginOptions struct {
metricsConfig GatewayStreamMetricsConfig
}
type GatewayStreamApiExtensionPluginOption func(*GatewayStreamApiExtensionPluginOptions)
func (o *GatewayStreamApiExtensionPluginOptions) apply(opts ...GatewayStreamApiExtensionPluginOption) {
for _, op := range opts {
op(o)
}
}
type GatewayStreamMetricsConfig struct {
// Prometheus registerer
Registerer prometheus.Registerer
// A function called on each stream's Connect that returns a list of static
// labels to attach to all metrics collected for that stream.
LabelsForStream func(context.Context) []attribute.KeyValue
}
func WithMetrics(conf GatewayStreamMetricsConfig) GatewayStreamApiExtensionPluginOption {
return func(o *GatewayStreamApiExtensionPluginOptions) {
o.metricsConfig = conf
}
}
func NewGatewayPlugin(p StreamAPIExtension, opts ...GatewayStreamApiExtensionPluginOption) plugin.Plugin {
options := GatewayStreamApiExtensionPluginOptions{}
options.apply(opts...)
pc, _, _, ok := runtime.Caller(1)
fn := runtime.FuncForPC(pc)
name := "unknown"
if ok {
fnName := fn.Name()
name = fnName[strings.LastIndex(fnName, "plugins/")+len("plugins/") : strings.LastIndex(fnName, ".")]
}
ext := &gatewayStreamExtensionServerImpl{
name: name,
logger: logger.NewPluginLogger().Named(name).Named("stream"),
metricsConfig: options.metricsConfig,
}
if p != nil {
if options.metricsConfig.Registerer != nil {
exporter, err := otelprometheus.New(
otelprometheus.WithRegisterer(options.metricsConfig.Registerer),
otelprometheus.WithoutScopeInfo(),
otelprometheus.WithoutTargetInfo(),
)
if err != nil {
panic("failed to create otel prometheus exporter")
}
ext.meterProvider = metric.NewMeterProvider(metric.WithReader(exporter),
metric.WithResource(resource.NewSchemaless(attribute.Key("plugin").String(name))))
}
servers := p.StreamServers()
for _, srv := range servers {
descriptor, err := grpcreflect.LoadServiceDescriptor(srv.Desc)
if err != nil {
panic(err)
}
ext.servers = append(ext.servers, &richServer{
Server: srv,
richDesc: descriptor,
})
}
if clientHandler, ok := p.(StreamClientHandler); ok {
ext.clientHandler = clientHandler
}
if clientDisconnectHandler, ok := p.(StreamClientDisconnectHandler); ok {
ext.clientDisconnectHandler = clientDisconnectHandler
}
}
return &streamApiExtensionPlugin[*gatewayStreamExtensionServerImpl]{
extensionSrv: ext,
}
}
type gatewayStreamExtensionServerImpl struct {
streamv1.UnimplementedStreamServer
apiextensions.UnsafeStreamAPIExtensionServer
name string
servers []*richServer
clientHandler StreamClientHandler
clientDisconnectHandler StreamClientDisconnectHandler
logger *zap.SugaredLogger
metricsConfig GatewayStreamMetricsConfig
meterProvider *metric.MeterProvider
}
// Implements streamv1.StreamServer
func (e *gatewayStreamExtensionServerImpl) Connect(stream streamv1.Stream_ConnectServer) error {
id := cluster.StreamAuthorizedID(stream.Context())
e.logger.With(
zap.String("id", id),
).Debug("stream connected")
opts := []totem.ServerOption{totem.WithName("plugin_" + e.name)}
if e.meterProvider != nil {
var labels []attribute.KeyValue
if e.metricsConfig.LabelsForStream != nil {
labels = e.metricsConfig.LabelsForStream(stream.Context())
}
opts = append(opts, totem.WithMetrics(e.meterProvider, labels...))
}
ts, err := totem.NewServer(stream, opts...)
if err != nil {
e.logger.With(
zap.Error(err),
).Error("failed to create stream server")
return err
}
for _, srv := range e.servers {
ts.RegisterService(srv.Desc, srv.Impl)
}
_, errC := ts.Serve()
e.logger.Debug("stream server started")
err = <-errC
if errors.Is(err, io.EOF) {
e.logger.Debug("stream server exited")
} else {
e.logger.With(
zap.Error(err),
).Warn("stream server exited with error")
}
return err
}
// ConnectInternal implements apiextensions.StreamAPIExtensionServer
func (e *gatewayStreamExtensionServerImpl) ConnectInternal(stream apiextensions.StreamAPIExtension_ConnectInternalServer) error {
if e.clientHandler == nil {
stream.SendHeader(metadata.Pairs("accept-internal-stream", "false"))
return nil
}
stream.SendHeader(metadata.Pairs("accept-internal-stream", "true"))
e.logger.Debug("internal gateway stream connected")
ts, err := totem.NewServer(stream)
if err != nil {
return err
}
cc, errC := ts.Serve()
select {
case err := <-errC:
if errors.Is(err, io.EOF) {
e.logger.Debug("stream disconnected")
} else {
e.logger.With(
zap.Error(err),
).Warn("stream disconnected with error")
}
return err
default:
}
e.logger.Debug("calling client handler")
go e.clientHandler.UseStreamClient(cc)
defer func() {
if e.clientDisconnectHandler != nil {
e.logger.Debug("calling disconnect handler")
e.clientDisconnectHandler.StreamDisconnected()
}
}()
return <-errC
}