added trigger
This commit is contained in:
Martino Ferrari
@@ -0,0 +1,435 @@
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package wshub
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import (
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"encoding/binary"
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"encoding/json"
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"math"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/gorilla/websocket"
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)
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// Trigger FSM states, matching the C++ StreamHub TriggerEngine and the strings
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// expected by the web SPA's "triggerState" handler.
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const (
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trigIdle = "idle"
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trigArmed = "armed"
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trigCollecting = "collecting"
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trigTriggered = "triggered"
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)
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// captureMarginSec is the extra delay past the post-trigger window before the
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// capture is extracted, so the rings have received the last samples.
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const captureMarginSec = 0.15
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// autoRearmDelaySec is the pause between a completed capture and the automatic
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// rearm in "normal" mode.
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const autoRearmDelaySec = 0.2
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// trigConfig is the client-settable part of the trigger.
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type trigConfig struct {
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signalKey string // "src:sig" or "src:sig[i]"
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edge string // "rising" | "falling" | "both"
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threshold float64
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windowSec float64
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prePercent float64
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mode string // "normal" | "single"
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}
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// triggerEngine implements the hub-side trigger FSM. Its methods are safe to
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// call from the WebSocket read goroutines and from Hub.Run() concurrently.
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type triggerEngine struct {
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mu sync.Mutex
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cfg trigConfig
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// Parsed form of cfg.signalKey, refreshed by SetConfig.
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baseKey string // "src:sig"
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elemIdx int // -1 when the key has no "[i]" suffix
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state string
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stopped bool
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prevValue float64
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prevValid bool
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lastT float64
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lastTOK bool
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trigTime float64
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firedPre float64
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firedPost float64
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firedValid bool
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rearmAt float64 // wall-clock seconds; 0 when no rearm is pending
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}
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func newTriggerEngine() *triggerEngine {
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return &triggerEngine{
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cfg: trigConfig{edge: "rising", windowSec: 1, prePercent: 20, mode: "normal"},
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elemIdx: -1,
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state: trigIdle,
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}
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}
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// parseSignalKey splits "src:sig[3]" into ("src:sig", 3). A key without an
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// element suffix yields an index of -1.
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func parseSignalKey(key string) (string, int) {
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if !strings.HasSuffix(key, "]") {
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return key, -1
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}
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open := strings.LastIndexByte(key, '[')
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if open < 0 {
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return key, -1
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}
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idx, err := strconv.Atoi(key[open+1 : len(key)-1])
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if err != nil || idx < 0 {
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return key, -1
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}
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return key[:open], idx
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}
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func (te *triggerEngine) SetConfig(cfg trigConfig) {
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te.mu.Lock()
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defer te.mu.Unlock()
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// Clamp to the bounds the web UI offers.
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if cfg.windowSec < 1e-4 {
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cfg.windowSec = 1e-4
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}
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if cfg.windowSec > 10 {
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cfg.windowSec = 10
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}
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if cfg.prePercent < 0 {
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cfg.prePercent = 0
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}
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if cfg.prePercent > 100 {
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cfg.prePercent = 100
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}
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te.cfg = cfg
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te.baseKey, te.elemIdx = parseSignalKey(cfg.signalKey)
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te.prevValid = false
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te.prevValue = 0
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}
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func (te *triggerEngine) Config() trigConfig {
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te.mu.Lock()
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defer te.mu.Unlock()
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return te.cfg
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}
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func (te *triggerEngine) Arm() {
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te.mu.Lock()
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te.state = trigArmed
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te.prevValid = false
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te.prevValue = 0
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te.rearmAt = 0
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te.mu.Unlock()
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}
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func (te *triggerEngine) Disarm() {
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te.mu.Lock()
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te.state = trigIdle
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te.stopped = false
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te.prevValid = false
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te.prevValue = 0
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te.firedValid = false
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te.rearmAt = 0
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te.mu.Unlock()
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}
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func (te *triggerEngine) SetStopped(v bool) {
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te.mu.Lock()
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te.stopped = v
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if v {
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te.rearmAt = 0
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}
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te.mu.Unlock()
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}
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func (te *triggerEngine) Stopped() bool {
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te.mu.Lock()
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defer te.mu.Unlock()
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return te.stopped
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}
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func (te *triggerEngine) State() string {
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te.mu.Lock()
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defer te.mu.Unlock()
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return te.state
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}
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// Active reports whether a trigger signal is configured. The rings must stay
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// populated from that moment on: a capture reaches back over the pre-trigger
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// window, so waiting until the trigger arms would leave that window empty.
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func (te *triggerEngine) Active() bool {
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te.mu.Lock()
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defer te.mu.Unlock()
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return te.baseKey != ""
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}
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// latchWindowLocked freezes the pre/post split at fire time so later config
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// edits do not change how the capture is rendered.
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func (te *triggerEngine) latchWindowLocked(t float64) {
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te.state = trigCollecting
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te.trigTime = t
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te.firedPre = te.cfg.windowSec * te.cfg.prePercent / 100
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te.firedPost = te.cfg.windowSec - te.firedPre
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te.firedValid = true
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te.rearmAt = 0
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}
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// Force fires the trigger immediately at the most recent sample time (falling
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// back to the current wall clock when no sample has been seen yet).
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func (te *triggerEngine) Force() {
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te.mu.Lock()
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defer te.mu.Unlock()
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if te.state == trigCollecting {
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return
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}
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t := float64(time.Now().UnixNano()) / 1e9
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if te.lastTOK {
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t = te.lastT
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}
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te.latchWindowLocked(t)
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}
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// feed passes a batch of full-resolution samples for one signal to the FSM.
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// key is the fully-prefixed "src:sig" name; nElem is the signal's element count
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// so that an "[i]"-suffixed configuration can select a single column out of the
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// flattened element-major batch.
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func (te *triggerEngine) feed(key string, nElem int, t, v []float64) {
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if len(t) == 0 || len(t) != len(v) {
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return
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}
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te.mu.Lock()
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defer te.mu.Unlock()
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if key != te.baseKey {
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return
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}
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te.lastT = t[len(t)-1]
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te.lastTOK = true
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if te.state != trigArmed {
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return
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}
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step, start := 1, 0
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if te.elemIdx >= 0 && nElem > 1 {
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if te.elemIdx >= nElem {
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return
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}
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step, start = nElem, te.elemIdx
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}
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thr := te.cfg.threshold
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for i := start; i < len(t); i += step {
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if !te.prevValid {
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te.prevValue = v[i]
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te.prevValid = true
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continue
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}
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up := te.prevValue < thr && v[i] >= thr
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down := te.prevValue > thr && v[i] <= thr
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te.prevValue = v[i]
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fired := false
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switch te.cfg.edge {
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case "falling":
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fired = down
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case "both":
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fired = up || down
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default:
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fired = up
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}
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if fired {
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te.latchWindowLocked(t[i])
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return
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}
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}
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}
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// dueCapture reports whether a collecting trigger's post-window has elapsed and
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// returns the latched window.
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func (te *triggerEngine) dueCapture(nowSec float64) (trigTime, pre, post float64, ok bool) {
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te.mu.Lock()
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defer te.mu.Unlock()
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if te.state != trigCollecting || !te.firedValid {
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return 0, 0, 0, false
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}
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if nowSec < te.trigTime+te.firedPost+captureMarginSec {
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return 0, 0, 0, false
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}
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return te.trigTime, te.firedPre, te.firedPost, true
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}
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// markTriggered completes a capture and schedules the automatic rearm when the
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// engine runs in "normal" mode.
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func (te *triggerEngine) markTriggered(nowSec float64) {
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te.mu.Lock()
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if te.state == trigCollecting {
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te.state = trigTriggered
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if te.cfg.mode != "single" && !te.stopped {
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te.rearmAt = nowSec + autoRearmDelaySec
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}
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}
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te.mu.Unlock()
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}
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// dueRearm reports whether a pending automatic rearm has come due, consuming it.
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func (te *triggerEngine) dueRearm(nowSec float64) bool {
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te.mu.Lock()
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defer te.mu.Unlock()
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if te.state != trigTriggered || te.rearmAt == 0 || nowSec < te.rearmAt {
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return false
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}
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te.rearmAt = 0
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return !te.stopped
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}
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// stateMsg builds the JSON "triggerState" broadcast for the current FSM state.
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func (te *triggerEngine) stateMsg() []byte {
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te.mu.Lock()
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m := map[string]any{
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"type": "triggerState",
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"state": te.state,
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"mode": te.cfg.mode,
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"stopped": te.stopped,
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}
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if te.firedValid {
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m["trigTime"] = te.trigTime
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}
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te.mu.Unlock()
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msg, _ := json.Marshal(m)
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return msg
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}
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/* ─── Hub integration ─────────────────────────────────────────────────────── */
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// broadcastTriggerState pushes the current FSM state to every client.
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func (h *Hub) broadcastTriggerState() {
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h.broadcast(h.trigger.stateMsg())
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}
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// handleTriggerCommand processes a trigger-related browser message. It returns
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// false when the message type is not a trigger command.
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func (h *Hub) handleTriggerCommand(t string, env map[string]interface{}) bool {
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switch t {
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case "setTrigger":
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cfg := h.trigger.Config()
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if s, ok := env["signal"].(string); ok {
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cfg.signalKey = s
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}
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if s, ok := env["edge"].(string); ok {
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cfg.edge = s
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}
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if s, ok := env["mode"].(string); ok {
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cfg.mode = s
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}
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if f, ok := env["threshold"].(float64); ok {
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cfg.threshold = f
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}
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if f, ok := env["windowSec"].(float64); ok {
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cfg.windowSec = f
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}
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if f, ok := env["prePercent"].(float64); ok {
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cfg.prePercent = f
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}
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h.trigger.SetConfig(cfg)
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case "arm", "rearm":
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h.trigger.Arm()
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case "disarm":
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h.trigger.Disarm()
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case "trigStop":
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stopped := !h.trigger.Stopped()
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if b, ok := env["stopped"].(bool); ok {
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stopped = b
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}
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h.trigger.SetStopped(stopped)
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case "forceTrigger":
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h.trigger.Force()
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default:
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return false
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}
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h.broadcastTriggerState()
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return true
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}
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// triggerTick services the trigger FSM; called from Hub.Run() on every push tick.
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func (h *Hub) triggerTick() {
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nowSec := float64(time.Now().UnixNano()) / 1e9
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prev := h.trigger.State()
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if trigTime, pre, post, ok := h.trigger.dueCapture(nowSec); ok {
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if msg := h.buildTriggerCapture(trigTime, pre, post); msg != nil {
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for c := range h.clients {
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select {
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case c.send <- wsMessage{websocket.BinaryMessage, msg}:
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default:
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}
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}
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}
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h.trigger.markTriggered(nowSec)
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} else if h.trigger.dueRearm(nowSec) {
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h.trigger.Arm()
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}
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if h.trigger.State() != prev {
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h.broadcastTriggerState()
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}
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}
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// buildTriggerCapture extracts [trigTime-pre, trigTime+post] from every ring
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// buffer and encodes the version-2 binary capture frame:
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//
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// [u8 2][f64 trigTime][f64 preSec][f64 postSec][u32 nSig]
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// {[u16 keyLen][fullKey][u32 N][t f64×N][v f64×N]}
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func (h *Hub) buildTriggerCapture(trigTime, pre, post float64) []byte {
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t0, t1 := trigTime-pre, trigTime+post
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type sigSlice struct {
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key string
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t, v []float64
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}
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h.ringsMu.RLock()
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keys := make([]string, 0, len(h.rings))
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rings := make([]*sigRing, 0, len(h.rings))
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for k, rb := range h.rings {
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keys = append(keys, k)
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rings = append(rings, rb)
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}
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h.ringsMu.RUnlock()
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slices := make([]sigSlice, 0, len(keys))
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total := 1 + 8 + 8 + 8 + 4
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for i, k := range keys {
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st, sv := rings[i].slice(t0, t1)
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if len(st) == 0 {
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continue
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}
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slices = append(slices, sigSlice{key: k, t: st, v: sv})
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total += 2 + len(k) + 4 + len(st)*16
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}
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if len(slices) == 0 {
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return nil
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}
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buf := make([]byte, total)
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buf[0] = 2
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off := 1
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binary.LittleEndian.PutUint64(buf[off:], math.Float64bits(trigTime))
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off += 8
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binary.LittleEndian.PutUint64(buf[off:], math.Float64bits(pre))
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off += 8
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binary.LittleEndian.PutUint64(buf[off:], math.Float64bits(post))
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off += 8
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binary.LittleEndian.PutUint32(buf[off:], uint32(len(slices)))
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off += 4
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for _, s := range slices {
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binary.LittleEndian.PutUint16(buf[off:], uint16(len(s.key)))
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off += 2
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copy(buf[off:], s.key)
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off += len(s.key)
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binary.LittleEndian.PutUint32(buf[off:], uint32(len(s.t)))
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off += 4
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off = writeFloat64s(buf, off, s.t)
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off = writeFloat64s(buf, off, s.v)
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}
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return buf
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}
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@@ -0,0 +1,194 @@
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package wshub
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import "testing"
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func TestParseSignalKey(t *testing.T) {
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cases := []struct {
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in string
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base string
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idx int
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}{
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{"src:sig", "src:sig", -1},
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{"src:sig[0]", "src:sig", 0},
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{"src:sig[3]", "src:sig", 3},
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{"src:sig[x]", "src:sig[x]", -1},
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{"src:sig]", "src:sig]", -1},
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}
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for _, c := range cases {
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base, idx := parseSignalKey(c.in)
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if base != c.base || idx != c.idx {
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t.Errorf("parseSignalKey(%q) = (%q,%d), want (%q,%d)",
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c.in, base, idx, c.base, c.idx)
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}
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}
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}
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func armed(key, edge string, thr float64) *triggerEngine {
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te := newTriggerEngine()
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te.SetConfig(trigConfig{signalKey: key, edge: edge, threshold: thr,
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windowSec: 1, prePercent: 20, mode: "normal"})
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te.Arm()
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return te
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}
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func TestFeedRisingEdge(t *testing.T) {
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te := armed("src:sig", "rising", 0.5)
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te.feed("src:sig", 1, []float64{1, 2, 3, 4}, []float64{0, 0.2, 0.9, 1.0})
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if te.State() != trigCollecting {
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t.Fatalf("state = %q, want collecting", te.State())
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}
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// Fires at the sample that crossed, i.e. t=3.
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trigTime, pre, post, ok := te.dueCapture(1e9)
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if !ok || trigTime != 3 {
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t.Fatalf("dueCapture = (%v,%v), want trigTime 3", trigTime, ok)
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}
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if pre != 0.2 || post != 0.8 {
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t.Errorf("pre/post = %v/%v, want 0.2/0.8", pre, post)
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}
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}
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func TestFeedFallingEdgeIgnoresRising(t *testing.T) {
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te := armed("src:sig", "falling", 0.5)
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te.feed("src:sig", 1, []float64{1, 2, 3}, []float64{0, 0.9, 1.0})
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if te.State() != trigArmed {
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t.Fatalf("state = %q, want armed (no falling edge)", te.State())
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}
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te.feed("src:sig", 1, []float64{4, 5}, []float64{0.6, 0.1})
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if te.State() != trigCollecting {
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t.Fatalf("state = %q, want collecting", te.State())
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}
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||||
}
|
||||
|
||||
func TestFeedIgnoresOtherSignals(t *testing.T) {
|
||||
te := armed("src:sig", "rising", 0.5)
|
||||
te.feed("src:other", 1, []float64{1, 2}, []float64{0, 1})
|
||||
if te.State() != trigArmed {
|
||||
t.Fatalf("state = %q, want armed", te.State())
|
||||
}
|
||||
}
|
||||
|
||||
func TestFeedArrayElementSelection(t *testing.T) {
|
||||
// 2-element signal, element-major: [e0,e1, e0,e1, ...]. Only element 1
|
||||
// crosses the threshold.
|
||||
te := armed("src:sig[1]", "rising", 0.5)
|
||||
tt := []float64{1, 1, 2, 2}
|
||||
vv := []float64{0, 0, 0, 1}
|
||||
te.feed("src:sig", 2, tt, vv)
|
||||
if te.State() != trigCollecting {
|
||||
t.Fatalf("state = %q, want collecting", te.State())
|
||||
}
|
||||
|
||||
// Element 0 never crosses, so a config on [0] must not fire.
|
||||
te2 := armed("src:sig[0]", "rising", 0.5)
|
||||
te2.feed("src:sig", 2, tt, vv)
|
||||
if te2.State() != trigArmed {
|
||||
t.Fatalf("state = %q, want armed", te2.State())
|
||||
}
|
||||
}
|
||||
|
||||
func TestForceUsesLastSampleTime(t *testing.T) {
|
||||
te := newTriggerEngine()
|
||||
te.SetConfig(trigConfig{signalKey: "src:sig", edge: "rising", threshold: 1e9,
|
||||
windowSec: 2, prePercent: 50, mode: "single"})
|
||||
te.Arm()
|
||||
te.feed("src:sig", 1, []float64{10, 11, 12}, []float64{0, 0, 0})
|
||||
if te.State() != trigArmed {
|
||||
t.Fatalf("state = %q, want armed (threshold unreachable)", te.State())
|
||||
}
|
||||
te.Force()
|
||||
trigTime, pre, post, ok := te.dueCapture(1e9)
|
||||
if !ok || trigTime != 12 || pre != 1 || post != 1 {
|
||||
t.Fatalf("dueCapture = (%v,%v,%v,%v), want (12,1,1,true)",
|
||||
trigTime, pre, post, ok)
|
||||
}
|
||||
}
|
||||
|
||||
func TestForceFromIdle(t *testing.T) {
|
||||
te := newTriggerEngine()
|
||||
te.SetConfig(trigConfig{signalKey: "src:sig", edge: "rising",
|
||||
windowSec: 1, prePercent: 20, mode: "normal"})
|
||||
te.Force()
|
||||
if te.State() != trigCollecting {
|
||||
t.Fatalf("state = %q, want collecting", te.State())
|
||||
}
|
||||
}
|
||||
|
||||
func TestCaptureMarginDelaysExtraction(t *testing.T) {
|
||||
te := armed("src:sig", "rising", 0.5)
|
||||
te.feed("src:sig", 1, []float64{0, 1}, []float64{0, 1}) // fires at t=1
|
||||
// post = 0.8 s; capture is due at 1 + 0.8 + 0.15.
|
||||
if _, _, _, ok := te.dueCapture(1.9); ok {
|
||||
t.Error("capture extracted before the margin elapsed")
|
||||
}
|
||||
if _, _, _, ok := te.dueCapture(1.96); !ok {
|
||||
t.Error("capture not extracted after the margin elapsed")
|
||||
}
|
||||
}
|
||||
|
||||
func TestAutoRearmNormalMode(t *testing.T) {
|
||||
te := armed("src:sig", "rising", 0.5)
|
||||
te.feed("src:sig", 1, []float64{0, 1}, []float64{0, 1})
|
||||
te.markTriggered(100)
|
||||
if te.State() != trigTriggered {
|
||||
t.Fatalf("state = %q, want triggered", te.State())
|
||||
}
|
||||
if te.dueRearm(100.1) {
|
||||
t.Error("rearmed before the delay elapsed")
|
||||
}
|
||||
if !te.dueRearm(100.3) {
|
||||
t.Error("did not rearm after the delay elapsed")
|
||||
}
|
||||
if te.dueRearm(200) {
|
||||
t.Error("rearm was not consumed")
|
||||
}
|
||||
}
|
||||
|
||||
func TestNoAutoRearmInSingleMode(t *testing.T) {
|
||||
te := newTriggerEngine()
|
||||
te.SetConfig(trigConfig{signalKey: "src:sig", edge: "rising", threshold: 0.5,
|
||||
windowSec: 1, prePercent: 20, mode: "single"})
|
||||
te.Arm()
|
||||
te.feed("src:sig", 1, []float64{0, 1}, []float64{0, 1})
|
||||
te.markTriggered(100)
|
||||
if te.dueRearm(200) {
|
||||
t.Error("single mode must not auto-rearm")
|
||||
}
|
||||
}
|
||||
|
||||
func TestStoppedSuppressesRearm(t *testing.T) {
|
||||
te := armed("src:sig", "rising", 0.5)
|
||||
te.feed("src:sig", 1, []float64{0, 1}, []float64{0, 1})
|
||||
te.SetStopped(true)
|
||||
te.markTriggered(100)
|
||||
if te.dueRearm(200) {
|
||||
t.Error("stopped engine must not rearm")
|
||||
}
|
||||
}
|
||||
|
||||
func TestSetConfigClamps(t *testing.T) {
|
||||
te := newTriggerEngine()
|
||||
te.SetConfig(trigConfig{signalKey: "s:x", windowSec: 100, prePercent: 500})
|
||||
if cfg := te.Config(); cfg.windowSec != 10 || cfg.prePercent != 100 {
|
||||
t.Errorf("upper clamp = %v/%v, want 10/100", cfg.windowSec, cfg.prePercent)
|
||||
}
|
||||
te.SetConfig(trigConfig{signalKey: "s:x", windowSec: 0, prePercent: -5})
|
||||
if cfg := te.Config(); cfg.windowSec != 1e-4 || cfg.prePercent != 0 {
|
||||
t.Errorf("lower clamp = %v/%v, want 1e-4/0", cfg.windowSec, cfg.prePercent)
|
||||
}
|
||||
}
|
||||
|
||||
func TestActiveTracksConfiguredSignal(t *testing.T) {
|
||||
te := newTriggerEngine()
|
||||
if te.Active() {
|
||||
t.Error("a fresh engine must not be active")
|
||||
}
|
||||
te.SetConfig(trigConfig{signalKey: "src:sig", windowSec: 1})
|
||||
if !te.Active() {
|
||||
t.Error("engine must be active once a signal is configured")
|
||||
}
|
||||
// Rings must keep filling after a capture completes, not just while armed.
|
||||
te.Disarm()
|
||||
if !te.Active() {
|
||||
t.Error("engine must stay active after disarm while a signal is set")
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,61 @@
|
||||
package wshub
|
||||
|
||||
import "testing"
|
||||
|
||||
func TestZoomPoints(t *testing.T) {
|
||||
cases := []struct {
|
||||
n int
|
||||
present bool
|
||||
want int
|
||||
}{
|
||||
{0, false, 2400}, // absent → default budget
|
||||
{2400, true, 2400}, // explicit budget honoured
|
||||
{0, true, 1 << 30}, // 0 → every sample in range
|
||||
{-1, true, 1 << 30}, // negative → every sample in range
|
||||
{5, true, 2400}, // implausibly small → default budget
|
||||
}
|
||||
for _, c := range cases {
|
||||
if got := zoomPoints(c.n, c.present); got != c.want {
|
||||
t.Errorf("zoomPoints(%d,%v) = %d, want %d", c.n, c.present, got, c.want)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func TestZoomSliceReturnsFullResolution(t *testing.T) {
|
||||
h := NewHub()
|
||||
rb := newSigRing(1000)
|
||||
ts := make([]float64, 500)
|
||||
vs := make([]float64, 500)
|
||||
for i := range ts {
|
||||
ts[i] = float64(i) * 0.001 // 1 kHz
|
||||
vs[i] = float64(i)
|
||||
}
|
||||
rb.write(ts, vs)
|
||||
h.rings["s1:sig"] = rb
|
||||
|
||||
// A budget larger than the range must return every sample untouched.
|
||||
res := h.zoomSlice(0.100, 0.199, []string{"s1:sig"}, 1<<30)
|
||||
sd, ok := res["s1:sig"]
|
||||
if !ok {
|
||||
t.Fatal("signal missing from zoom result")
|
||||
}
|
||||
if len(sd.T) != 100 {
|
||||
t.Fatalf("got %d points, want 100", len(sd.T))
|
||||
}
|
||||
if sd.V[0] != 100 || sd.V[99] != 199 {
|
||||
t.Errorf("value range = %v..%v, want 100..199", sd.V[0], sd.V[99])
|
||||
}
|
||||
|
||||
// A small budget decimates but keeps the endpoints.
|
||||
dec := h.zoomSlice(0.100, 0.199, []string{"s1:sig"}, 20)
|
||||
if len(dec["s1:sig"].T) != 20 {
|
||||
t.Errorf("decimated to %d points, want 20", len(dec["s1:sig"].T))
|
||||
}
|
||||
}
|
||||
|
||||
func TestZoomSliceUnknownSignal(t *testing.T) {
|
||||
h := NewHub()
|
||||
if res := h.zoomSlice(0, 1, []string{"nope", ""}, 100); len(res) != 0 {
|
||||
t.Errorf("got %d entries, want 0", len(res))
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user