/
apigateway.go
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/
apigateway.go
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// Copyright 2021 Nitric Technologies Pty Ltd.
//
// 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 websocket
import (
"context"
"fmt"
"strings"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/config"
"github.com/aws/aws-sdk-go-v2/service/apigatewaymanagementapi"
"github.com/nitrictech/nitric/cloud/aws/common"
"github.com/nitrictech/nitric/cloud/aws/runtime/env"
"github.com/nitrictech/nitric/cloud/aws/runtime/resource"
grpc_errors "github.com/nitrictech/nitric/core/pkg/grpc/errors"
"github.com/nitrictech/nitric/core/pkg/logger"
resourcespb "github.com/nitrictech/nitric/core/pkg/proto/resources/v1"
websocketpb "github.com/nitrictech/nitric/core/pkg/proto/websockets/v1"
"go.opentelemetry.io/contrib/instrumentation/github.com/aws/aws-sdk-go-v2/otelaws"
"google.golang.org/grpc/codes"
)
type ApiGatewayWebsocketService struct {
provider *resource.AwsResourceService
clients map[string]*apigatewaymanagementapi.Client
}
var _ websocketpb.WebsocketServer = &ApiGatewayWebsocketService{}
func (a *ApiGatewayWebsocketService) getClientForSocket(socket string) (*apigatewaymanagementapi.Client, error) {
awsRegion := env.AWS_REGION.String()
if client, ok := a.clients[socket]; ok {
logger.Debug("using existing websocket client found in cache")
return client, nil
}
details, err := a.SocketDetails(context.TODO(), &websocketpb.WebsocketDetailsRequest{
SocketName: socket,
})
if err != nil {
return nil, fmt.Errorf("error getting websocket details: %w", err)
}
cfg, sessionError := config.LoadDefaultConfig(context.TODO(), config.WithRegion(awsRegion))
if sessionError != nil {
return nil, fmt.Errorf("error creating new AWS session: %w", sessionError)
}
// post requests are made to the https endpoint, so the scheme needs to be changed
callbackUrl := details.Url
if strings.HasPrefix(details.Url, "wss") {
callbackUrl = strings.Replace(details.Url, "wss", "https", 1)
}
otelaws.AppendMiddlewares(&cfg.APIOptions)
a.clients[socket] = apigatewaymanagementapi.NewFromConfig(cfg, func(o *apigatewaymanagementapi.Options) {
o.BaseEndpoint = aws.String(callbackUrl)
})
return a.clients[socket], nil
}
func (a *ApiGatewayWebsocketService) SocketDetails(ctx context.Context, req *websocketpb.WebsocketDetailsRequest) (*websocketpb.WebsocketDetailsResponse, error) {
gwDetails, err := a.provider.GetAWSApiGatewayDetails(ctx, &resourcespb.ResourceIdentifier{
Type: resourcespb.ResourceType_Websocket,
Name: req.SocketName,
})
if err != nil {
return nil, err
}
return &websocketpb.WebsocketDetailsResponse{
Url: fmt.Sprintf("%s/%s", gwDetails.Url, common.DefaultWsStageName),
}, nil
}
func (a *ApiGatewayWebsocketService) SendMessage(ctx context.Context, req *websocketpb.WebsocketSendRequest) (*websocketpb.WebsocketSendResponse, error) {
newErr := grpc_errors.ErrorsWithScope("ApiGateway.Websocket.Send")
client, err := a.getClientForSocket(req.SocketName)
if err != nil {
return nil, newErr(
codes.Internal,
"error getting websocket client",
err,
)
}
_, err = client.PostToConnection(ctx, &apigatewaymanagementapi.PostToConnectionInput{
ConnectionId: aws.String(req.ConnectionId),
Data: req.Data,
})
if err != nil {
return nil, newErr(
codes.Internal,
"error sending message to websocket",
err,
)
}
return &websocketpb.WebsocketSendResponse{}, nil
}
func (a *ApiGatewayWebsocketService) CloseConnection(ctx context.Context, req *websocketpb.WebsocketCloseConnectionRequest) (*websocketpb.WebsocketCloseConnectionResponse, error) {
client, err := a.getClientForSocket(req.SocketName)
if err != nil {
return nil, err
}
_, err = client.DeleteConnection(ctx, &apigatewaymanagementapi.DeleteConnectionInput{
ConnectionId: aws.String(req.ConnectionId),
})
if err != nil {
return nil, err
}
return &websocketpb.WebsocketCloseConnectionResponse{}, nil
}
func NewAwsApiGatewayWebsocket(provider *resource.AwsResourceService) (*ApiGatewayWebsocketService, error) {
return &ApiGatewayWebsocketService{
provider: provider,
clients: make(map[string]*apigatewaymanagementapi.Client),
}, nil
}