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| 1 | +// Copyright 2024 The Swarm Authors. All rights reserved. |
| 2 | +// Use of this source code is governed by a BSD-style |
| 3 | +// license that can be found in the LICENSE file. |
| 4 | + |
| 5 | +package api |
| 6 | + |
| 7 | +import ( |
| 8 | + "net/http" |
| 9 | + "time" |
| 10 | + |
| 11 | + "github.com/ethersphere/bee/v2/pkg/jsonhttp" |
| 12 | + "github.com/ethersphere/bee/v2/pkg/swarm" |
| 13 | + "github.com/gorilla/mux" |
| 14 | + "github.com/gorilla/websocket" |
| 15 | +) |
| 16 | + |
| 17 | +func (s *Service) gsocWsHandler(w http.ResponseWriter, r *http.Request) { |
| 18 | + logger := s.logger.WithName("gsoc_subscribe").Build() |
| 19 | + |
| 20 | + paths := struct { |
| 21 | + Address swarm.Address `map:"address,resolve" validate:"required"` |
| 22 | + }{} |
| 23 | + |
| 24 | + if response := s.mapStructure(mux.Vars(r), &paths); response != nil { |
| 25 | + response("invalid path params", logger, w) |
| 26 | + return |
| 27 | + } |
| 28 | + |
| 29 | + upgrader := websocket.Upgrader{ |
| 30 | + ReadBufferSize: swarm.ChunkSize, |
| 31 | + WriteBufferSize: swarm.ChunkSize, |
| 32 | + CheckOrigin: s.checkOrigin, |
| 33 | + } |
| 34 | + |
| 35 | + conn, err := upgrader.Upgrade(w, r, nil) |
| 36 | + if err != nil { |
| 37 | + logger.Debug("upgrade failed", "error", err) |
| 38 | + logger.Error(nil, "upgrade failed") |
| 39 | + jsonhttp.InternalServerError(w, "upgrade failed") |
| 40 | + return |
| 41 | + } |
| 42 | + |
| 43 | + s.wsWg.Add(1) |
| 44 | + go s.gsocListeningWs(conn, paths.Address) |
| 45 | +} |
| 46 | + |
| 47 | +func (s *Service) gsocListeningWs(conn *websocket.Conn, socAddress swarm.Address) { |
| 48 | + defer s.wsWg.Done() |
| 49 | + |
| 50 | + var ( |
| 51 | + dataC = make(chan []byte) |
| 52 | + gone = make(chan struct{}) |
| 53 | + ticker = time.NewTicker(s.WsPingPeriod) |
| 54 | + err error |
| 55 | + ) |
| 56 | + defer func() { |
| 57 | + ticker.Stop() |
| 58 | + _ = conn.Close() |
| 59 | + }() |
| 60 | + cleanup := s.gsoc.Subscribe(socAddress, func(m []byte) { |
| 61 | + select { |
| 62 | + case dataC <- m: |
| 63 | + case <-gone: |
| 64 | + return |
| 65 | + case <-s.quit: |
| 66 | + return |
| 67 | + } |
| 68 | + }) |
| 69 | + |
| 70 | + defer cleanup() |
| 71 | + |
| 72 | + conn.SetCloseHandler(func(code int, text string) error { |
| 73 | + s.logger.Debug("gsoc ws: client gone", "code", code, "message", text) |
| 74 | + close(gone) |
| 75 | + return nil |
| 76 | + }) |
| 77 | + |
| 78 | + for { |
| 79 | + select { |
| 80 | + case b := <-dataC: |
| 81 | + err = conn.SetWriteDeadline(time.Now().Add(writeDeadline)) |
| 82 | + if err != nil { |
| 83 | + s.logger.Debug("gsoc ws: set write deadline failed", "error", err) |
| 84 | + return |
| 85 | + } |
| 86 | + |
| 87 | + err = conn.WriteMessage(websocket.BinaryMessage, b) |
| 88 | + if err != nil { |
| 89 | + s.logger.Debug("gsoc ws: write message failed", "error", err) |
| 90 | + return |
| 91 | + } |
| 92 | + |
| 93 | + case <-s.quit: |
| 94 | + // shutdown |
| 95 | + err = conn.SetWriteDeadline(time.Now().Add(writeDeadline)) |
| 96 | + if err != nil { |
| 97 | + s.logger.Debug("gsoc ws: set write deadline failed", "error", err) |
| 98 | + return |
| 99 | + } |
| 100 | + err = conn.WriteMessage(websocket.CloseMessage, []byte{}) |
| 101 | + if err != nil { |
| 102 | + s.logger.Debug("gsoc ws: write close message failed", "error", err) |
| 103 | + } |
| 104 | + return |
| 105 | + case <-gone: |
| 106 | + // client gone |
| 107 | + return |
| 108 | + case <-ticker.C: |
| 109 | + err = conn.SetWriteDeadline(time.Now().Add(writeDeadline)) |
| 110 | + if err != nil { |
| 111 | + s.logger.Debug("gsoc ws: set write deadline failed", "error", err) |
| 112 | + return |
| 113 | + } |
| 114 | + if err = conn.WriteMessage(websocket.PingMessage, nil); err != nil { |
| 115 | + // error encountered while pinging client. client probably gone |
| 116 | + return |
| 117 | + } |
| 118 | + } |
| 119 | + } |
| 120 | +} |
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