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api_channel.go
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api_channel.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 (
"fmt"
"github.com/gofrs/uuid"
"github.com/heroiclabs/nakama/api"
"go.opencensus.io/stats"
"go.opencensus.io/tag"
"go.opencensus.io/trace"
"go.uber.org/zap"
"golang.org/x/net/context"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"time"
)
func (s *ApiServer) ListChannelMessages(ctx context.Context, in *api.ListChannelMessagesRequest) (*api.ChannelMessageList, error) {
userID := ctx.Value(ctxUserIDKey{}).(uuid.UUID)
// Before hook.
if fn := s.runtime.BeforeListChannelMessages(); fn != nil {
// Stats measurement start boundary.
fullMethod := ctx.Value(ctxFullMethodKey{}).(string)
name := fmt.Sprintf("%v-before", fullMethod)
statsCtx, _ := tag.New(context.Background(), tag.Upsert(MetricsFunction, name))
startNanos := time.Now().UTC().UnixNano()
span := trace.NewSpan(name, nil, trace.StartOptions{})
// Extract request information and execute the hook.
clientIP, clientPort := extractClientAddress(s.logger, ctx)
result, err, code := fn(ctx, s.logger, userID.String(), ctx.Value(ctxUsernameKey{}).(string), ctx.Value(ctxExpiryKey{}).(int64), clientIP, clientPort, in)
if err != nil {
return nil, status.Error(code, err.Error())
}
if result == nil {
// If result is nil, requested resource is disabled.
s.logger.Warn("Intercepted a disabled resource.", zap.Any("resource", fullMethod), zap.String("uid", userID.String()))
return nil, status.Error(codes.NotFound, "Requested resource was not found.")
}
in = result
// Stats measurement end boundary.
span.End()
stats.Record(statsCtx, MetricsApiTimeSpentMsec.M(float64(time.Now().UTC().UnixNano()-startNanos)/1000), MetricsApiCount.M(1))
}
if in.ChannelId == "" {
return nil, status.Error(codes.InvalidArgument, "Invalid channel ID.")
}
limit := 1
if in.GetLimit() != nil {
if in.GetLimit().Value < 1 || in.GetLimit().Value > 100 {
return nil, status.Error(codes.InvalidArgument, "Invalid limit - limit must be between 1 and 100.")
}
limit = int(in.GetLimit().Value)
}
forward := true
if in.GetForward() != nil {
forward = in.GetForward().Value
}
streamConversionResult, err := ChannelIdToStream(in.ChannelId)
if err != nil {
return nil, status.Error(codes.InvalidArgument, "Invalid channel ID.")
}
messageList, err := ChannelMessagesList(ctx, s.logger, s.db, userID, streamConversionResult.Stream, in.ChannelId, limit, forward, in.Cursor)
if err == ErrChannelCursorInvalid {
return nil, status.Error(codes.InvalidArgument, "Cursor is invalid or expired.")
} else if err == ErrChannelGroupNotFound {
return nil, status.Error(codes.InvalidArgument, "Group not found.")
} else if err != nil {
return nil, status.Error(codes.Internal, "Error listing messages from channel.")
}
// After hook.
if fn := s.runtime.AfterListChannelMessages(); fn != nil {
// Stats measurement start boundary.
name := fmt.Sprintf("%v-after", ctx.Value(ctxFullMethodKey{}).(string))
statsCtx, _ := tag.New(context.Background(), tag.Upsert(MetricsFunction, name))
startNanos := time.Now().UTC().UnixNano()
span := trace.NewSpan(name, nil, trace.StartOptions{})
// Extract request information and execute the hook.
clientIP, clientPort := extractClientAddress(s.logger, ctx)
fn(ctx, s.logger, userID.String(), ctx.Value(ctxUsernameKey{}).(string), ctx.Value(ctxExpiryKey{}).(int64), clientIP, clientPort, messageList, in)
// Stats measurement end boundary.
span.End()
stats.Record(statsCtx, MetricsApiTimeSpentMsec.M(float64(time.Now().UTC().UnixNano()-startNanos)/1000), MetricsApiCount.M(1))
}
return messageList, nil
}