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server.go
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server.go
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package pgvcr
import (
"braces.dev/errtrace"
"context"
"golang.org/x/sync/errgroup"
"log/slog"
"net"
"strings"
)
type server struct {
cfg Config
}
func NewServer(cfg Config) Server {
if cfg.EchoFilePath == "" {
cfg.EchoFilePath = defaultEchoFilePath
}
if cfg.RealPostgresBuilder == nil {
cfg.RealPostgresBuilder = defaultPostgresBuilder
}
if cfg.IsRecording == nil {
cfg.IsRecording = defaultIsRecording
}
if cfg.QueryOrderValidationStrategy == "" {
cfg.QueryOrderValidationStrategy = defaultQueryOrderValidationStrategy
}
if cfg.Logger == nil {
cfg.Logger = slog.New(NoopHandler{})
}
cfg.Logger = cfg.Logger.WithGroup("pgvcr")
return &server{
cfg: cfg,
}
}
type Server interface {
Start(ctx context.Context) (StartedServer, error)
}
func (s *server) Start(ctx context.Context) (StartedServer, error) {
ctx, cancelFn := context.WithCancel(ctx)
if s.cfg.Logger != nil {
ctx = contextWithLogger(ctx, s.cfg.Logger)
}
isRecording, err := s.cfg.IsRecording(ctx, s.cfg)
if err != nil {
cancelFn()
return nil, err
}
listener := s.cfg.Listener
if listener == nil {
listener, err = net.Listen("tcp", "localhost:")
if err != nil {
cancelFn()
return nil, err
}
}
_ = context.AfterFunc(ctx, func() {
err := listener.Close()
if err != nil {
s.cfg.Logger.Error(err.Error(), slog.Any("error", err))
}
})
eg, ctx := errgroup.WithContext(ctx)
var (
serveFunc func() error
connectionString ConnectionString
)
if isRecording {
serveFunc, connectionString, err = s.recordingServer(ctx, listener)
} else {
serveFunc, connectionString, err = s.replayingServer(ctx, listener)
}
if err != nil {
cancelFn()
return nil, err
}
eg.Go(serveFunc)
return &startedServer{
eg: eg,
connectionString: connectionString,
cancelFn: cancelFn,
}, nil
}
type startedServer struct {
connectionString ConnectionString
eg *errgroup.Group
cancelFn context.CancelFunc
}
type StartedServer interface {
Wait() error
Stop() error
ConnectionString() ConnectionString
}
func (s *startedServer) Wait() error {
return s.eg.Wait()
}
func (s *startedServer) Stop() error {
s.cancelFn()
err := s.Wait()
if err != nil && strings.Contains(err.Error(), "use of closed network connection") {
return nil
}
return errtrace.Wrap(err)
}
func (s *startedServer) ConnectionString() ConnectionString {
return s.connectionString
}
type serveFn func() error