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|
// Package pgmock provides the ability to mock a PostgreSQL server.
package pgmock
import (
"fmt"
"io"
"reflect"
"github.com/jackc/pgx/v5/pgproto3"
)
type Step interface {
Step(*pgproto3.Backend) error
}
type Script struct {
Steps []Step
}
func (s *Script) Run(backend *pgproto3.Backend) error {
for _, step := range s.Steps {
err := step.Step(backend)
if err != nil {
return err
}
}
return nil
}
func (s *Script) Step(backend *pgproto3.Backend) error {
return s.Run(backend)
}
type expectMessageStep struct {
want pgproto3.FrontendMessage
any bool
}
func (e *expectMessageStep) Step(backend *pgproto3.Backend) error {
msg, err := backend.Receive()
if err != nil {
return err
}
if e.any && reflect.TypeOf(msg) == reflect.TypeOf(e.want) {
return nil
}
if !reflect.DeepEqual(msg, e.want) {
return fmt.Errorf("msg => %#v, e.want => %#v", msg, e.want)
}
return nil
}
type expectStartupMessageStep struct {
want *pgproto3.StartupMessage
any bool
}
func (e *expectStartupMessageStep) Step(backend *pgproto3.Backend) error {
msg, err := backend.ReceiveStartupMessage()
if err != nil {
return err
}
if e.any {
return nil
}
if !reflect.DeepEqual(msg, e.want) {
return fmt.Errorf("msg => %#v, e.want => %#v", msg, e.want)
}
return nil
}
func ExpectMessage(want pgproto3.FrontendMessage) Step {
return expectMessage(want, false)
}
func ExpectAnyMessage(want pgproto3.FrontendMessage) Step {
return expectMessage(want, true)
}
func expectMessage(want pgproto3.FrontendMessage, any bool) Step {
if want, ok := want.(*pgproto3.StartupMessage); ok {
return &expectStartupMessageStep{want: want, any: any}
}
return &expectMessageStep{want: want, any: any}
}
type sendMessageStep struct {
msg pgproto3.BackendMessage
}
func (e *sendMessageStep) Step(backend *pgproto3.Backend) error {
backend.Send(e.msg)
return backend.Flush()
}
func SendMessage(msg pgproto3.BackendMessage) Step {
return &sendMessageStep{msg: msg}
}
type waitForCloseMessageStep struct{}
func (e *waitForCloseMessageStep) Step(backend *pgproto3.Backend) error {
for {
msg, err := backend.Receive()
if err == io.EOF {
return nil
} else if err != nil {
return err
}
if _, ok := msg.(*pgproto3.Terminate); ok {
return nil
}
}
}
func WaitForClose() Step {
return &waitForCloseMessageStep{}
}
func AcceptUnauthenticatedConnRequestSteps() []Step {
return []Step{
ExpectAnyMessage(&pgproto3.StartupMessage{ProtocolVersion: pgproto3.ProtocolVersionNumber, Parameters: map[string]string{}}),
SendMessage(&pgproto3.AuthenticationOk{}),
SendMessage(&pgproto3.BackendKeyData{ProcessID: 0, SecretKey: 0}),
SendMessage(&pgproto3.ReadyForQuery{TxStatus: 'I'}),
}
}
|
