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server.go
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server.go
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package commandbushttp
import (
"context"
"fmt"
"io/ioutil"
"net/http"
"github.com/go-gulfstream/gulfstream/pkg/stream"
"github.com/go-gulfstream/gulfstream/pkg/command"
)
type ServerRequestFunc func(r *http.Request, c *command.Command)
type ServerResponseFunc func(w http.ResponseWriter, r *command.Reply)
type ContextFunc func(ctx context.Context) context.Context
type ServerErrorHandler func(err error)
type Server struct {
mutator stream.CommandSinker
commandCodec command.Encoding
requestFunc []ServerRequestFunc
responseFunc []ServerResponseFunc
contextFunc []ContextFunc
errorHandler []ServerErrorHandler
}
func NewServer(
mutator stream.CommandSinker,
opts ...ServerOption,
) *Server {
srv := &Server{
mutator: mutator,
requestFunc: []ServerRequestFunc{},
responseFunc: []ServerResponseFunc{},
}
for _, opt := range opts {
opt(srv)
}
return srv
}
type ServerOption func(*Server)
func WithServerCodec(c command.Encoding) ServerOption {
return func(srv *Server) {
srv.commandCodec = c
}
}
func WithServerRequestFunc(fn ServerRequestFunc) ServerOption {
return func(srv *Server) {
srv.requestFunc = append(srv.requestFunc, fn)
}
}
func WithServerResponseFunc(fn ServerResponseFunc) ServerOption {
return func(srv *Server) {
srv.responseFunc = append(srv.responseFunc, fn)
}
}
func WithServerContextFunc(fn ContextFunc) ServerOption {
return func(srv *Server) {
srv.contextFunc = append(srv.contextFunc, fn)
}
}
func WithServerErrorHandler(fn ServerErrorHandler) ServerOption {
return func(srv *Server) {
srv.errorHandler = append(srv.errorHandler, fn)
}
}
func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
ctx, cancel := context.WithCancel(r.Context())
defer cancel()
for _, ctxFunc := range s.contextFunc {
ctx = ctxFunc(ctx)
}
data, err := ioutil.ReadAll(r.Body)
if err != nil {
s.writeError(w, err)
return
}
defer r.Body.Close()
if len(data) == 0 {
s.writeError(w, fmt.Errorf("no data"))
return
}
cmd, err := s.decodeCommand(data)
if err != nil {
s.writeError(w, err)
return
}
for _, reqFunc := range s.requestFunc {
reqFunc(r, cmd)
}
reply, err := s.mutator.CommandSink(ctx, cmd)
if err != nil {
s.writeError(w, err)
return
}
for _, respFunc := range s.responseFunc {
respFunc(w, reply)
}
rawReply, err := reply.MarshalBinary()
if err != nil {
s.writeError(w, err)
return
}
_, _ = w.Write(rawReply)
}
func (s *Server) decodeCommand(data []byte) (*command.Command, error) {
if s.commandCodec != nil {
return s.commandCodec.Decode(data)
} else {
return command.Decode(data)
}
}
func (s *Server) writeError(w http.ResponseWriter, err error) {
for _, errFunc := range s.errorHandler {
errFunc(err)
}
w.WriteHeader(http.StatusInternalServerError)
_, _ = w.Write([]byte(err.Error()))
}