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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| /********************************************************************************** | ||
| * Copyright (c) 2009-2020 Misakai Ltd. | ||
| * This program is free software: you can redistribute it and/or modify it under the | ||
| * terms of the GNU Affero General Public License as published by the Free Software | ||
| * Foundation, either version 3 of the License, or(at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, but WITHOUT ANY | ||
| * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A | ||
| * PARTICULAR PURPOSE. See the GNU Affero General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public License along | ||
| * with this program. If not, see<http://www.gnu.org/licenses/>. | ||
| ************************************************************************************/ | ||
|
|
||
| package history | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
|
|
||
| "github.com/emitter-io/emitter/internal/errors" | ||
| "github.com/emitter-io/emitter/internal/message" | ||
| "github.com/emitter-io/emitter/internal/provider/logging" | ||
| "github.com/emitter-io/emitter/internal/security" | ||
| "github.com/emitter-io/emitter/internal/service" | ||
| ) | ||
|
|
||
| // Request represents a historical messages request. | ||
| type Request struct { | ||
| Key string `json:"key"` // The channel key for this request. | ||
| Channel string `json:"channel"` // The target channel for this request. | ||
| StartFromID message.ID `json:"startFromID,omitempty"` | ||
| } | ||
|
|
||
| type Message struct { | ||
| ID message.ID `json:"id"` | ||
| Topic string `json:"topic"` // The channel of the message | ||
| Payload string `json:"payload"` // The payload of the message | ||
| } | ||
| type Response struct { | ||
| Request uint16 `json:"req,omitempty"` // The corresponding request ID. | ||
| Messages []Message `json:"messages"` // The history of messages. | ||
| } | ||
|
|
||
| // ForRequest sets the request ID in the response for matching | ||
| func (r *Response) ForRequest(id uint16) { | ||
| r.Request = id | ||
| } | ||
|
|
||
| // OnRequest handles a request of historical messages. | ||
| func (s *Service) OnRequest(c service.Conn, payload []byte) (service.Response, bool) { | ||
| var request Request | ||
| if err := json.Unmarshal(payload, &request); err != nil { | ||
| return errors.ErrBadRequest, false | ||
| } | ||
|
|
||
| channel := security.ParseChannel([]byte(request.Channel)) | ||
| if channel.ChannelType == security.ChannelInvalid { | ||
| return errors.ErrBadRequest, false | ||
| } | ||
|
|
||
| // Check the authorization and permissions | ||
| _, key, allowed := s.auth.Authorize(channel, security.AllowLoad) | ||
| if !allowed { | ||
| return errors.ErrUnauthorized, false | ||
| } | ||
|
|
||
| // Use limit = 1 if not specified, otherwise use the limit option. The limit now | ||
| // defaults to one as per MQTT spec we always need to send retained messages. | ||
| limit := int64(1) | ||
| if v, ok := channel.Last(); ok { | ||
| limit = v | ||
| } | ||
|
|
||
| ssid := message.NewSsid(key.Contract(), channel.Query) | ||
| t0, t1 := channel.Window() // Get the window | ||
|
|
||
| msgs, err := s.store.Query(ssid, t0, t1, request.StartFromID, int(limit)) | ||
| if err != nil { | ||
| logging.LogError("conn", "query last messages", err) | ||
| return errors.ErrServerError, false | ||
| } | ||
|
|
||
| resp := &Response{ | ||
| Messages: make([]Message, 0, len(msgs)), | ||
| } | ||
| for _, m := range msgs { | ||
| msg := m | ||
| resp.Messages = append(resp.Messages, Message{ | ||
| ID: msg.ID, | ||
| Topic: string(msg.Channel), // The channel for this message. | ||
| Payload: string(msg.Payload), // The payload for this message. | ||
| }) | ||
| } | ||
| return resp, true | ||
| } |
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