forked from aunum/gold
/
server.go
198 lines (176 loc) · 4.99 KB
/
server.go
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package env
import (
"context"
"fmt"
"os"
"os/signal"
"strings"
"syscall"
"time"
"github.com/aunum/gold/pkg/v1/common"
"github.com/aunum/log"
spherev1alpha "github.com/aunum/sphere/api/gen/go/v1alpha"
"github.com/ory/dockertest"
dc "github.com/ory/dockertest/docker"
"google.golang.org/grpc"
)
// Server of environments.
type Server struct {
// Client to connect to the Sphere server.
Client spherev1alpha.EnvironmentAPIClient
resource *dockertest.Resource
containerID string
pool *dockertest.Pool
conn *grpc.ClientConn
logger *log.Logger
dialOpts []grpc.DialOption
}
// LocalServerConfig is the environment server config.
type LocalServerConfig struct {
// Docker image of environment.
Image string
// Version of the docker image.
Version string
// Port the environment is exposed on.
Port string
// Logger for the server.
Logger *log.Logger
}
// GymServerConfig is a configuration for a OpenAI Gym server environment.
var GymServerConfig = &LocalServerConfig{Image: "sphereproject/gym", Version: "latest", Port: "50051/tcp"}
// NewLocalServer creates a new environment server by launching a docker container and connecting to it.
func NewLocalServer(config *LocalServerConfig) (*Server, error) {
if config.Logger == nil {
config.Logger = log.DefaultLogger
}
config.Logger.Info("creating local server")
pool, err := dockertest.NewPool("")
if err != nil {
return nil, fmt.Errorf("Could not connect to docker: %s", err)
}
resource, err := pool.Run(config.Image, config.Version, []string{})
if err != nil {
return nil, fmt.Errorf("Could not start resource: %s", err)
}
addr := fmt.Sprintf("localhost:%s", resource.GetPort(config.Port))
client, conn, err := connect(addr, config.Logger, grpc.WithInsecure(), grpc.WithBlock())
if err != nil {
return nil, err
}
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
go func() {
sig := <-sigs
config.Logger.Warningf("closing env on sig %s", sig.String())
resource.Close()
os.Exit(1)
}()
return &Server{
Client: client,
conn: conn,
resource: resource,
pool: pool,
logger: config.Logger,
}, nil
}
// FindOrCreate will find a local server for the given config or create one.
func FindOrCreate(config *LocalServerConfig) (*Server, error) {
if config.Logger == nil {
config.Logger = log.DefaultLogger
}
pool, err := dockertest.NewPool("")
if err != nil {
return nil, fmt.Errorf("Could not connect to docker: %s", err)
}
containers, err := pool.Client.ListContainers(dc.ListContainersOptions{
All: true,
Filters: map[string][]string{
"ancestor": {config.Image},
},
})
if err != nil {
return nil, err
}
if len(containers) == 0 {
config.Logger.Info("no existing containers found, creating new...")
return NewLocalServer(config)
}
container := containers[0]
config.Logger.Infof("connecting to existing container %q", strings.TrimPrefix(container.Names[0], "/"))
port := container.Ports[0]
addr := fmt.Sprintf("localhost:%d", port.PublicPort)
client, conn, err := connect(addr, config.Logger, grpc.WithInsecure(), grpc.WithBlock())
if err != nil {
return nil, err
}
return &Server{
Client: client,
conn: conn,
pool: pool,
containerID: container.ID,
logger: config.Logger,
}, nil
}
// Connect to a server.
func Connect(addr string, opts ...ServerOpts) (*Server, error) {
s := &Server{}
for _, opt := range opts {
opt(s)
}
if s.logger == nil {
s.logger = log.DefaultLogger
}
client, conn, err := connect(addr, s.logger, s.dialOpts...)
if err != nil {
return nil, err
}
s.Client = client
s.conn = conn
return s, nil
}
func connect(addr string, logger *log.Logger, opts ...grpc.DialOption) (spherev1alpha.EnvironmentAPIClient, *grpc.ClientConn, error) {
var sphereClient spherev1alpha.EnvironmentAPIClient
var conn *grpc.ClientConn
err := common.Retry(10, 1*time.Second, func() error {
var err error
conn, err = grpc.Dial(addr, opts...)
if err != nil {
return err
}
sphereClient = spherev1alpha.NewEnvironmentAPIClient(conn)
resp, err := sphereClient.Info(context.Background(), &spherev1alpha.Empty{})
if err != nil {
return err
}
logger.Successf("connected to server %q", resp.ServerName)
return nil
})
if err != nil {
return nil, nil, err
}
return sphereClient, conn, nil
}
// Close the server, removing any local resources.
func (s *Server) Close() error {
if s.resource != nil {
return s.resource.Close()
}
if s.pool != nil {
return s.pool.Client.RemoveContainer(dc.RemoveContainerOptions{ID: s.containerID, Force: true, RemoveVolumes: true})
}
return s.conn.Close()
}
// ServerOpts are the connection opts.
type ServerOpts func(*Server)
// WithServerLogger adds a logger to the server.
func WithServerLogger(logger *log.Logger) func(*Server) {
return func(s *Server) {
s.logger = logger
}
}
// WithDialOpts adds dial options to the server connection.
func WithDialOpts(dialOpts ...grpc.DialOption) func(*Server) {
return func(s *Server) {
s.dialOpts = dialOpts
}
}