forked from wundergraph/graphql-go-tools
/
handler.go
87 lines (74 loc) · 1.94 KB
/
handler.go
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package http
import (
"encoding/json"
"io"
"net/http"
"github.com/gobwas/ws"
log "github.com/jensneuse/abstractlogger"
"github.com/dchukmasov/graphql-go-tools/pkg/execution"
)
const (
httpHeaderUpgrade string = "Upgrade"
)
func NewGraphqlHTTPHandlerFunc(executionHandler *execution.Handler, logger log.Logger, upgrader *ws.HTTPUpgrader) http.Handler {
return &GraphQLHTTPRequestHandler{
log: logger,
executionHandler: executionHandler,
wsUpgrader: upgrader,
}
}
type GraphQLHTTPRequestHandler struct {
log log.Logger
executionHandler *execution.Handler
wsUpgrader *ws.HTTPUpgrader
}
func (g *GraphQLHTTPRequestHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
isUpgrade := g.isWebsocketUpgrade(r)
if isUpgrade {
err := g.upgradeWithNewGoroutine(w, r)
if err != nil {
g.log.Error("GraphQLHTTPRequestHandler.ServeHTTP",
log.Error(err),
)
w.WriteHeader(http.StatusBadRequest)
}
return
}
g.handleHTTP(w, r)
}
func (g *GraphQLHTTPRequestHandler) upgradeWithNewGoroutine(w http.ResponseWriter, r *http.Request) error {
conn, _, _, err := g.wsUpgrader.Upgrade(r, w)
if err != nil {
return err
}
g.handleWebsocket(conn)
return nil
}
func (g *GraphQLHTTPRequestHandler) isWebsocketUpgrade(r *http.Request) bool {
for _, header := range r.Header[httpHeaderUpgrade] {
if header == "websocket" {
return true
}
}
return false
}
func (g *GraphQLHTTPRequestHandler) extraVariables(r *http.Request, out io.Writer) error {
headers := map[string]string{}
for key := range r.Header {
headers[key] = r.Header.Get(key)
}
cookies := map[string]string{}
for _, cookie := range r.Cookies() {
cookies[cookie.Name] = cookie.Value
}
extra := map[string]interface{}{
"request": map[string]interface{}{
"uri": r.RequestURI,
"method": r.Method,
"host": r.Host,
"headers": headers,
"cookies": cookies,
},
}
return json.NewEncoder(out).Encode(extra)
}