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server.go
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server.go
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package grpc
import (
"context"
"fmt"
"net"
"google.golang.org/grpc"
"google.golang.org/grpc/reflection"
"github.com/netobserv/netobserv-ebpf-agent/pkg/pbflow"
)
// CollectorServer wraps a Flow Collector connection & session
type CollectorServer struct {
grpcServer *grpc.Server
}
type collectorOptions struct {
grpcServerOptions []grpc.ServerOption
}
// CollectorOption allows overriding the default configuration of the CollectorServer instance.
// Use them in the StartCollector function.
type CollectorOption func(options *collectorOptions)
func WithGRPCServerOptions(options ...grpc.ServerOption) CollectorOption {
return func(copt *collectorOptions) {
copt.grpcServerOptions = options
}
}
// StartCollector listens in background for gRPC+Protobuf flows in the given port, and forwards each
// set of *pbflow.Records by the provided channel.
func StartCollector(
port int, recordForwarder chan<- *pbflow.Records, options ...CollectorOption,
) (*CollectorServer, error) {
copts := collectorOptions{}
for _, opt := range options {
opt(&copts)
}
lis, err := net.Listen("tcp", fmt.Sprintf(":%d", port))
if err != nil {
return nil, err
}
grpcServer := grpc.NewServer(copts.grpcServerOptions...)
pbflow.RegisterCollectorServer(grpcServer, &collectorAPI{
recordForwarder: recordForwarder,
})
reflection.Register(grpcServer)
go func() {
if err := grpcServer.Serve(lis); err != nil {
panic("error connecting to server: " + err.Error())
}
}()
return &CollectorServer{
grpcServer: grpcServer,
}, nil
}
func (c *CollectorServer) Close() error {
c.grpcServer.Stop()
return nil
}
type collectorAPI struct {
pbflow.UnimplementedCollectorServer
recordForwarder chan<- *pbflow.Records
}
var okReply = &pbflow.CollectorReply{}
func (c *collectorAPI) Send(_ context.Context, records *pbflow.Records) (*pbflow.CollectorReply, error) {
c.recordForwarder <- records
return okReply, nil
}