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api_rpc.go
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api_rpc.go
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// Copyright 2018 The Nakama Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package server
import (
"net"
"strings"
"github.com/gofrs/uuid"
"github.com/heroiclabs/nakama/api"
"go.uber.org/zap"
"golang.org/x/net/context"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/peer"
"google.golang.org/grpc/status"
)
func (s *ApiServer) RpcFunc(ctx context.Context, in *api.Rpc) (*api.Rpc, error) {
if in.Id == "" {
return nil, status.Error(codes.InvalidArgument, "RPC ID must be set")
}
id := strings.ToLower(in.Id)
fn := s.runtime.Rpc(id)
if fn == nil {
return nil, status.Error(codes.NotFound, "RPC function not found")
}
queryParams := make(map[string][]string, 0)
if md, ok := metadata.FromIncomingContext(ctx); !ok {
return nil, status.Error(codes.Internal, "RPC function could not get incoming context")
} else {
for k, vs := range md {
// Only process the keys representing custom query parameters.
if strings.HasPrefix(k, "q_") {
queryParams[k[2:]] = vs
}
}
}
uid := ""
username := ""
expiry := int64(0)
if u := ctx.Value(ctxUserIDKey{}); u != nil {
uid = u.(uuid.UUID).String()
}
if u := ctx.Value(ctxUsernameKey{}); u != nil {
username = u.(string)
}
if e := ctx.Value(ctxExpiryKey{}); e != nil {
expiry = e.(int64)
}
clientAddr := ""
clientIP := ""
clientPort := ""
md, _ := metadata.FromIncomingContext(ctx)
if ips := md.Get("x-forwarded-for"); len(ips) > 0 {
// look for gRPC-Gateway / LB header
clientAddr = strings.Split(ips[0], ",")[0]
} else if peerInfo, ok := peer.FromContext(ctx); ok {
// if missing, try to look up gRPC peer info
clientAddr = peerInfo.Addr.String()
}
clientAddr = strings.TrimSpace(clientAddr)
if host, port, err := net.SplitHostPort(clientAddr); err == nil {
clientIP = host
clientPort = port
} else if addrErr, ok := err.(*net.AddrError); ok && addrErr.Err == "missing port in address" {
clientIP = clientAddr
} else {
s.logger.Debug("Could not extract client address from request.", zap.Error(err))
}
result, fnErr, code := fn(ctx, queryParams, uid, username, expiry, "", clientIP, clientPort, in.Payload)
if fnErr != nil {
return nil, status.Error(code, fnErr.Error())
}
return &api.Rpc{Payload: result}, nil
}