/
socket.go
231 lines (222 loc) · 6.13 KB
/
socket.go
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package gqlwsserver
import (
"context"
"errors"
"fmt"
"net/http"
"time"
"github.com/gorilla/websocket"
"github.com/graphql-go/graphql"
"github.com/graphql-go/graphql/language/ast"
goutils "github.com/onichandame/go-utils"
gqlwserror "github.com/onichandame/gql-ws/error"
gqlwsmessage "github.com/onichandame/gql-ws/message"
)
type Socket struct {
*Config
reader, writer chan *gqlwsmessage.Message
breaker chan error
done chan interface{}
init chan *gqlwsmessage.Message
inited bool
err error
// the connection parameters negotiated on ConnectionInit
// will inject into every graphql resolver. can be retrieved by context.Value(reflect.Typeof(ConnectionParams{}))
connectionParams ConnectionParams
sm *subMan
}
func NewSocket(cfg *Config) *Socket {
var sock Socket
cfg.init()
sock.Config = cfg
sock.reader = make(chan *gqlwsmessage.Message)
sock.writer = make(chan *gqlwsmessage.Message)
sock.init = make(chan *gqlwsmessage.Message)
sock.breaker = make(chan error)
sock.done = make(chan interface{})
sock.sm = newSubMan()
sock.listen()
return &sock
}
func (sock *Socket) Close() {
defer goutils.RecoverToErr(new(error))
sock.breaker <- errors.New(`closed by user`)
}
func (sock *Socket) Wait() {
<-sock.done
}
func (sock *Socket) Error() error { return sock.err }
func (sock *Socket) listen() {
conn := sock.getConn()
// cleanup
go func() {
defer close(sock.done)
defer conn.Close()
err := <-sock.breaker
sock.err = err
if err != nil {
if err := conn.WriteControl(websocket.CloseMessage, []byte(err.Error()), time.Now().Add(sock.GraceClosePeriod)); err == nil {
time.Sleep(sock.GraceClosePeriod)
}
}
}()
// reader
go func() {
var err error
defer func() {
defer goutils.RecoverToErr(new(error))
sock.breaker <- err
}()
defer goutils.RecoverToErr(&err)
for {
var msg gqlwsmessage.Message
goutils.Assert(conn.ReadJSON(&msg))
sock.reader <- &msg
}
}()
// writer
go func() {
var err error
defer func() {
defer goutils.RecoverToErr(new(error))
sock.breaker <- err
}()
defer goutils.RecoverToErr(&err)
for msg := range sock.writer {
goutils.Assert(conn.WriteJSON(msg))
}
}()
// listener
go func() {
for {
select {
case req := <-sock.reader:
go sock.handleRequest(req)
case <-sock.done:
return
}
}
}()
// init
func() {
var err error
defer func() {
defer goutils.RecoverToErr(new(error))
if err != nil {
sock.breaker <- err
}
}()
defer goutils.RecoverToErr(&err)
sock.inited = false
timeout := make(chan int)
go func() {
defer goutils.RecoverToErr(new(error))
time.Sleep(sock.ConnectionInitTimeout)
if !sock.inited {
timeout <- 0
}
}()
select {
case <-timeout:
panic(gqlwserror.NewFatalError(4408, `Connection initialisation timeout`))
case init := <-sock.init:
sock.OnConnectionInit(init)
sock.connectionParams = init.Payload
sock.writer <- &gqlwsmessage.Message{Type: gqlwsmessage.ConnectionAck, Payload: sock.OnConnectionInit(init)}
sock.inited = true
}
}()
}
func (sock *Socket) getConn() *websocket.Conn {
upgrader := websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin: func(r *http.Request) bool { return true },
HandshakeTimeout: time.Second * 5,
Subprotocols: []string{`graphql-transport-ws`}, // internalize
}
conn, err := upgrader.Upgrade(sock.Response, sock.Request, nil)
goutils.Assert(err)
if conn.Subprotocol() != `graphql-transport-ws` {
panic(errors.New(`subprotocol must be graphql-transport-ws`))
}
return conn
}
func (sock *Socket) handleRequest(msg *gqlwsmessage.Message) {
var err error
defer func() {
defer goutils.RecoverToErr(new(error))
if err != nil {
if he, ok := err.(*gqlwserror.HandlableError); ok {
sock.writer <- he.GetMessage()
} else {
sock.breaker <- err
}
}
}()
defer goutils.RecoverToErr(&err)
switch msg.Type {
case gqlwsmessage.ConnectionInit:
sock.init <- msg
case gqlwsmessage.Ping:
var payload gqlwsmessage.Payload
if sock.OnPing != nil {
payload = sock.OnPing(msg)
}
sock.writer <- &gqlwsmessage.Message{Type: gqlwsmessage.Pong, Payload: payload}
case gqlwsmessage.Pong:
if sock.OnPong != nil {
sock.OnPong(msg)
}
case gqlwsmessage.Subscribe:
if !sock.inited {
panic(gqlwserror.NewFatalError(4401, `Unauthorized`))
}
if msg.ID == nil {
panic(gqlwserror.NewFatalError(4400, `Subscriber must come with an id`))
}
if sock.sm.has(*msg.ID) {
panic(gqlwserror.NewFatalError(4409, fmt.Sprintf(`Subscriber for %v already exists`, *msg.ID)))
}
var query gqlwsmessage.SubscribePayload
if err := goutils.Try(func() { goutils.UnmarshalJSONFromMap(msg.Payload.(map[string]interface{}), &query) }); err != nil {
panic(gqlwserror.NewFatalError(4400, `Payload of subscribe request invalid`))
}
stopchan := sock.sm.add(*msg.ID)
defer sock.sm.del(*msg.ID)
if getOperationTypeOfReq(query.Query) == ast.OperationTypeSubscription {
params := sock.getGqlParams(&query, stopchan)
reschan := graphql.Subscribe(*params)
for {
res, ok := <-reschan
if !ok {
return
}
sock.writer <- &gqlwsmessage.Message{Type: gqlwsmessage.Next, Payload: res, ID: msg.ID}
}
} else {
sock.writer <- &gqlwsmessage.Message{Type: gqlwsmessage.Next, ID: msg.ID, Payload: graphql.Do(*sock.getGqlParams(&query, stopchan))}
}
sock.writer <- &gqlwsmessage.Message{Type: gqlwsmessage.Complete, ID: msg.ID}
case gqlwsmessage.Complete:
if msg.ID == nil {
panic(gqlwserror.NewFatalError(4400, `complete message must come with an id`))
}
sock.sm.del(*msg.ID)
default:
panic(gqlwserror.NewFatalError(4400, fmt.Sprintf(`message type %v not supported`, msg.Type)))
}
}
func (sock *Socket) getGqlParams(q *gqlwsmessage.SubscribePayload, stopchan chan interface{}) *graphql.Params {
ctx := sock.Context
if ctx == nil {
ctx = context.Background()
}
return &graphql.Params{
Schema: *sock.Schema,
RequestString: q.Query,
VariableValues: q.Variables,
OperationName: q.OperationName,
Context: context.WithValue(context.WithValue(ctx, connParamsKey, sock.connectionParams), subscriptionStopKey, stopchan),
}
}