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apis.go
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apis.go
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// Copyright Nitric Pty Ltd.
//
// SPDX-License-Identifier: Apache-2.0
//
// 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 apis
import (
"fmt"
"slices"
"strings"
"sync"
"github.com/asaskevich/EventBus"
"github.com/valyala/fasthttp"
"github.com/nitrictech/cli/pkg/grpcx"
apispb "github.com/nitrictech/nitric/core/pkg/proto/apis/v1"
"github.com/nitrictech/nitric/core/pkg/workers/apis"
)
type (
ApiName = string
ServiceName = string
State = map[ApiName]map[ServiceName][]*apispb.RegistrationRequest
)
type ApiRequestState struct {
Api string
ReqCtx *fasthttp.RequestCtx
HttpResp *apispb.HttpResponse
}
type LocalApiGatewayService struct {
*apis.RouteWorkerManager
apiRegLock sync.RWMutex
state State
bus EventBus.Bus
}
func deepCopyApiMap(originalMap map[ApiName]map[ServiceName][]*apispb.RegistrationRequest) map[ApiName]map[ServiceName][]*apispb.RegistrationRequest {
copiedMap := make(map[ApiName]map[ServiceName][]*apispb.RegistrationRequest)
for apiName, serviceMap := range originalMap {
copiedMap[apiName] = make(map[ServiceName][]*apispb.RegistrationRequest)
for serviceName, requests := range serviceMap {
copiedRequests := make([]*apispb.RegistrationRequest, len(requests))
copy(copiedRequests, requests)
copiedMap[apiName][serviceName] = copiedRequests
}
}
return copiedMap
}
const localApiGatewayTopic = "local_api_gateway"
const localApiRequestTopic = "local_api_gateway_request"
func (l *LocalApiGatewayService) publishState() {
l.bus.Publish(localApiGatewayTopic, l.GetState())
}
var _ apispb.ApiServer = (*LocalApiGatewayService)(nil)
func (l *LocalApiGatewayService) SubscribeToState(subscriberFunction func(State)) {
// ignore the error, it's only returned if the fn param isn't a function
_ = l.bus.Subscribe(localApiGatewayTopic, subscriberFunction)
}
func (l *LocalApiGatewayService) PublishActionState(state ApiRequestState) {
l.bus.Publish(localApiRequestTopic, state)
}
func (l *LocalApiGatewayService) SubscribeToAction(subscription func(ApiRequestState)) {
// ignore the error, it's only returned if the fn param isn't a function
_ = l.bus.Subscribe(localApiRequestTopic, subscription)
}
// GetState - Returns a copy of internal state
func (l *LocalApiGatewayService) GetState() State {
l.apiRegLock.RLock()
defer l.apiRegLock.RUnlock()
return deepCopyApiMap(l.state)
}
func (l *LocalApiGatewayService) registerApiWorker(serviceName string, registrationRequest *apispb.RegistrationRequest) error {
l.apiRegLock.Lock()
if !strings.HasPrefix(registrationRequest.Path, "/") {
return fmt.Errorf("service %s attempted to register path '%s' which is missing a leading slash", registrationRequest.Api, registrationRequest.Path)
}
if l.state[registrationRequest.Api] == nil {
l.state[registrationRequest.Api] = make(map[string][]*apispb.RegistrationRequest)
}
l.state[registrationRequest.Api][serviceName] = append(l.state[registrationRequest.Api][serviceName], registrationRequest)
l.apiRegLock.Unlock()
l.publishState()
return nil
}
func (l *LocalApiGatewayService) unregisterApiWorker(serviceName string, registrationRequest *apispb.RegistrationRequest) {
l.apiRegLock.Lock()
defer func() {
l.apiRegLock.Unlock()
l.publishState()
}()
l.state[registrationRequest.Api][serviceName] = slices.DeleteFunc(l.state[registrationRequest.Api][serviceName], func(item *apispb.RegistrationRequest) bool {
return item == registrationRequest
})
if len(l.state[registrationRequest.Api][serviceName]) == 0 {
delete(l.state[registrationRequest.Api], serviceName)
}
if len(l.state[registrationRequest.Api]) == 0 {
delete(l.state, registrationRequest.Api)
}
}
func (l *LocalApiGatewayService) Serve(stream apispb.Api_ServeServer) error {
serviceName, err := grpcx.GetServiceNameFromStream(stream)
if err != nil {
return err
}
peekableStream := grpcx.NewPeekableStreamServer[*apispb.ServerMessage, *apispb.ClientMessage](stream)
firstRequest, err := peekableStream.Peek()
if err != nil {
return err
}
if firstRequest.GetRegistrationRequest() == nil {
return fmt.Errorf("first request must be a Registration Request")
}
// register the api
err = l.registerApiWorker(serviceName, firstRequest.GetRegistrationRequest())
if err != nil {
return err
}
defer l.unregisterApiWorker(serviceName, firstRequest.GetRegistrationRequest())
return l.RouteWorkerManager.Serve(peekableStream)
}
func NewLocalApiGatewayService() *LocalApiGatewayService {
return &LocalApiGatewayService{
RouteWorkerManager: apis.New(),
state: State{},
bus: EventBus.New(),
}
}