author | Mikael Berthe <mikael@lilotux.net> |
Sat, 04 Feb 2023 12:58:35 +0100 | |
changeset 265 | 05c40b36d3b2 |
parent 242 | vendor/github.com/McKael/madon/v2/streams.go@2a9ec03fe5a1 |
child 268 | 4dd196a4ee7c |
permissions | -rw-r--r-- |
242
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1 |
/* |
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2 |
Copyright 2017-2018 Mikael Berthe |
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3 |
|
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4 |
Licensed under the MIT license. Please see the LICENSE file is this directory. |
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5 |
*/ |
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6 |
|
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7 |
package madon |
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8 |
|
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9 |
import ( |
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10 |
"encoding/json" |
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11 |
"net/url" |
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12 |
"strings" |
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13 |
|
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"github.com/gorilla/websocket" |
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"github.com/pkg/errors" |
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16 |
) |
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17 |
|
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// StreamEvent contains a single event from the streaming API |
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19 |
type StreamEvent struct { |
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Event string // Name of the event (error, update, notification or delete) |
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Data interface{} // Status, Notification or status ID |
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Error error // Error message from the StreamListener |
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23 |
} |
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24 |
|
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// openStream opens a stream URL and returns an http.Response |
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// Note that the caller should close the connection when it's done reading |
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// the stream. |
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// The stream name can be "user", "local", "public", "direct", "list" or |
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// "hashtag". |
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// When it is "hashtag", the param argument contains the hashtag. |
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// When it is "list", the param argument contains the list ID. |
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func (mc *Client) openStream(streamName, param string) (*websocket.Conn, error) { |
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var tag, list string |
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34 |
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switch streamName { |
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case "user", "public", "public:local", "direct": |
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case "hashtag": |
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if param == "" { |
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return nil, ErrInvalidParameter |
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} |
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tag = param |
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42 |
case "list": |
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if param == "" { |
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return nil, ErrInvalidParameter |
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} |
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list = param |
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default: |
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return nil, ErrInvalidParameter |
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} |
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50 |
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51 |
if !strings.HasPrefix(mc.APIBase, "http") { |
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return nil, errors.New("cannot create Websocket URL: unexpected API base URL") |
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} |
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54 |
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// Build streaming websocket URL |
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u, err := url.Parse("ws" + mc.APIBase[4:] + "/v1/streaming/") |
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if err != nil { |
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return nil, errors.Wrap(err, "cannot create Websocket URL") |
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} |
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urlParams := url.Values{} |
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urlParams.Add("stream", streamName) |
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urlParams.Add("access_token", mc.UserToken.AccessToken) |
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if tag != "" { |
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urlParams.Add("tag", tag) |
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} else if list != "" { |
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urlParams.Add("list", list) |
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} |
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u.RawQuery = urlParams.Encode() |
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c, _, err := websocket.DefaultDialer.Dial(u.String(), nil) |
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72 |
return c, err |
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} |
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74 |
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75 |
// readStream reads from the http.Response and sends events to the events channel |
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76 |
// It stops when the connection is closed or when the stopCh channel is closed. |
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// The foroutine will close the doneCh channel when it terminates. |
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78 |
func (mc *Client) readStream(events chan<- StreamEvent, stopCh <-chan bool, doneCh chan bool, c *websocket.Conn) { |
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79 |
defer c.Close() |
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80 |
defer close(doneCh) |
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81 |
|
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82 |
go func() { |
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83 |
select { |
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84 |
case <-stopCh: |
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85 |
// Close connection |
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86 |
c.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, "")) |
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87 |
case <-doneCh: |
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88 |
// Leave |
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89 |
} |
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90 |
}() |
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91 |
|
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92 |
for { |
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93 |
var msg struct { |
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94 |
Event string |
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95 |
Payload interface{} |
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96 |
} |
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97 |
|
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98 |
err := c.ReadJSON(&msg) |
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99 |
if err != nil { |
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100 |
if strings.Contains(err.Error(), "close 1000 (normal)") { |
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101 |
break // Connection properly closed |
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102 |
} |
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103 |
e := errors.Wrap(err, "read error") |
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104 |
events <- StreamEvent{Event: "error", Error: e} |
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105 |
break |
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106 |
} |
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107 |
|
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108 |
var obj interface{} |
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109 |
|
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110 |
// Decode API object |
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111 |
switch msg.Event { |
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112 |
case "update": |
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113 |
strPayload, ok := msg.Payload.(string) |
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114 |
if !ok { |
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115 |
e := errors.New("could not decode status: payload isn't a string") |
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116 |
events <- StreamEvent{Event: "error", Error: e} |
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117 |
continue |
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118 |
} |
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119 |
var s Status |
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120 |
if err := json.Unmarshal([]byte(strPayload), &s); err != nil { |
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121 |
e := errors.Wrap(err, "could not decode status") |
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122 |
events <- StreamEvent{Event: "error", Error: e} |
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123 |
continue |
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124 |
} |
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125 |
obj = s |
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126 |
case "notification": |
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127 |
strPayload, ok := msg.Payload.(string) |
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128 |
if !ok { |
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129 |
e := errors.New("could not decode notification: payload isn't a string") |
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130 |
events <- StreamEvent{Event: "error", Error: e} |
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131 |
continue |
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132 |
} |
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133 |
var notif Notification |
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134 |
if err := json.Unmarshal([]byte(strPayload), ¬if); err != nil { |
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135 |
e := errors.Wrap(err, "could not decode notification") |
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136 |
events <- StreamEvent{Event: "error", Error: e} |
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137 |
continue |
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138 |
} |
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139 |
obj = notif |
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140 |
case "delete": |
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141 |
strPayload, ok := msg.Payload.(string) |
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142 |
if !ok { |
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143 |
e := errors.New("could not decode deletion: payload isn't a string") |
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144 |
events <- StreamEvent{Event: "error", Error: e} |
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|
145 |
continue |
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146 |
} |
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147 |
obj = strPayload // statusID |
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148 |
default: |
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149 |
e := errors.Errorf("unhandled event '%s'", msg.Event) |
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150 |
events <- StreamEvent{Event: "error", Error: e} |
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|
151 |
continue |
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152 |
} |
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153 |
|
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154 |
// Send event to the channel |
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155 |
events <- StreamEvent{Event: msg.Event, Data: obj} |
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156 |
} |
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157 |
} |
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158 |
|
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159 |
// StreamListener listens to a stream from the Mastodon server |
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160 |
// The stream 'name' can be "user", "local", "public" or "hashtag". |
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161 |
// For 'hashtag', the hashTag argument cannot be empty. |
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162 |
// The events are sent to the events channel (the errors as well). |
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163 |
// The streaming is terminated if the 'stopCh' channel is closed. |
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164 |
// The 'doneCh' channel is closed if the connection is closed by the server. |
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|
165 |
// Please note that this method launches a goroutine to listen to the events. |
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166 |
func (mc *Client) StreamListener(name, hashTag string, events chan<- StreamEvent, stopCh <-chan bool, doneCh chan bool) error { |
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|
167 |
if mc == nil { |
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|
168 |
return ErrUninitializedClient |
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|
169 |
} |
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|
170 |
|
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|
171 |
conn, err := mc.openStream(name, hashTag) |
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|
172 |
if err != nil { |
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|
173 |
return err |
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|
174 |
} |
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|
175 |
go mc.readStream(events, stopCh, doneCh, conn) |
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|
176 |
return nil |
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|
177 |
} |