fswtch 0.1.8

Rust bindings and helpers for writing FreeSWITCH modules
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157

use std::sync::atomic::{AtomicUsize, Ordering};

use fswtch::{
    MediaBugAction, MediaBugConfig, MediaBugContext, MediaBugFlags, MediaBugHandler, MediaFrame,
};

static COUNTERS: Counters = Counters::new();

fswtch::module_exports! {
    module = mod_media_bug_meter,
    load = switch_module_load,
}

const METER_APP: fswtch::ApplicationInfo = fswtch::ApplicationInfo::new(
    "rust_media_bug_meter",
    "Attaches a read/write-stream media bug and counts observed audio frames",
    "Rust media bug meter example",
    "rust_media_bug_meter",
);

struct Counters {
    bugs_attached: AtomicUsize,
    bugs_closed: AtomicUsize,
    read_frames_seen: AtomicUsize,
    write_frames_seen: AtomicUsize,
    read_audio_bytes_seen: AtomicUsize,
    write_audio_bytes_seen: AtomicUsize,
}

impl Counters {
    const fn new() -> Self {
        Self {
            bugs_attached: AtomicUsize::new(0),
            bugs_closed: AtomicUsize::new(0),
            read_frames_seen: AtomicUsize::new(0),
            write_frames_seen: AtomicUsize::new(0),
            read_audio_bytes_seen: AtomicUsize::new(0),
            write_audio_bytes_seen: AtomicUsize::new(0),
        }
    }
}

#[derive(Debug)]
struct MeterState {
    read_frames: usize,
    write_frames: usize,
    read_audio_bytes: usize,
    write_audio_bytes: usize,
}

impl MediaBugHandler for MeterState {
    fn on_read(&mut self, _ctx: &mut MediaBugContext<'_>, frame: MediaFrame<'_>) -> MediaBugAction {
        let bytes = frame.data_len();
        self.read_frames += 1;
        self.read_audio_bytes += bytes;
        COUNTERS.read_frames_seen.fetch_add(1, Ordering::Relaxed);
        COUNTERS
            .read_audio_bytes_seen
            .fetch_add(bytes, Ordering::Relaxed);
        MediaBugAction::Continue
    }

    fn on_write(
        &mut self,
        _ctx: &mut MediaBugContext<'_>,
        frame: MediaFrame<'_>,
    ) -> MediaBugAction {
        let bytes = frame.data_len();
        self.write_frames += 1;
        self.write_audio_bytes += bytes;
        COUNTERS.write_frames_seen.fetch_add(1, Ordering::Relaxed);
        COUNTERS
            .write_audio_bytes_seen
            .fetch_add(bytes, Ordering::Relaxed);
        MediaBugAction::Continue
    }

    fn on_close(&mut self, _ctx: &mut MediaBugContext<'_>) {
        fswtch::log_info("mod_media_bug_meter", "media bug closing");
        COUNTERS.bugs_closed.fetch_add(1, Ordering::Relaxed);
    }
}

fswtch::app_callback! {
    fn meter_app(session, _data) {
        fswtch::log_info("mod_media_bug_meter", "dialplan application invoked");
        let Some(session) = session else {
            fswtch::log_info("mod_media_bug_meter", "missing session");
            return;
        };

        let config = match MediaBugConfig::new(
            "rust_media_bug_meter",
            "read-write-stream",
            MediaBugFlags::READ_STREAM | MediaBugFlags::WRITE_STREAM | MediaBugFlags::NO_PAUSE,
        ) {
            Ok(config) => config,
            Err(error) => {
                fswtch::log_error(
                    "mod_media_bug_meter",
                    format!("invalid media bug config: {error}"),
                );
                return;
            }
        };
        let handler = MeterState {
            read_frames: 0,
            write_frames: 0,
            read_audio_bytes: 0,
            write_audio_bytes: 0,
        };

        match fswtch::attach_media_bug(session, config, handler) {
            Ok(_) => {
                COUNTERS.bugs_attached.fetch_add(1, Ordering::Relaxed);
                fswtch::log_info("mod_media_bug_meter", "media bug attached");
            }
            Err(error) => fswtch::log_error(
                "mod_media_bug_meter",
                format!("failed to attach media bug: {error}"),
            ),
        }
    }
}

fswtch::api_callback! {
    fn stats_api(_cmd, _session, stream) {
        fswtch::log_info("mod_media_bug_meter", "rust_media_bug_meter_stats invoked");
        stream.write(
            &format!(
                "attached={} closed={} read_frames={} write_frames={} read_audio_bytes={} write_audio_bytes={}\n",
                COUNTERS.bugs_attached.load(Ordering::Relaxed),
                COUNTERS.bugs_closed.load(Ordering::Relaxed),
                COUNTERS.read_frames_seen.load(Ordering::Relaxed),
                COUNTERS.write_frames_seen.load(Ordering::Relaxed),
                COUNTERS.read_audio_bytes_seen.load(Ordering::Relaxed),
                COUNTERS.write_audio_bytes_seen.load(Ordering::Relaxed)
            ),
        )
    }
}

fswtch::module_load! {
    fn switch_module_load(module) for "mod_media_bug_meter" {
        fswtch::log_info("mod_media_bug_meter", "loading module");
        module
            .application(METER_APP, meter_app)
            .and_then(|module| {
                module.api(
                    "rust_media_bug_meter_stats",
                    "prints media bug meter counters",
                    "rust_media_bug_meter_stats",
                    stats_api,
                )
            })
    }
}