feat: Strata support (detect via /health, read /metrics.live)

src/stats.ts

@@ -308,3 +308,67 @@ export function selectSessionUrls(
   }
   return []
 }
+
+// --- Strata adapter ---------------------------------------------------------
+// Strata is a llama.cpp-derived server whose HTTP layer is Python. Its /slots
+// route is a minimal compatibility stub, but /metrics.live carries the live
+// rates directly: prefill_tok_s_mean while reading, tok_s while generating.
+
+export type ServerType = "llama" | "strata"
+
+/** Returns the explicit server type from the plugin option, or undefined for auto. */
+export function serverTypeOverride(value: unknown): ServerType | undefined {
+  if (value === "llama" || value === "strata") return value
+  return undefined
+}
+
+/** True when a parsed /health body identifies the server as Strata. */
+export function isStrataHealth(health: unknown): boolean {
+  if (!health || typeof health !== "object") return false
+  return (health as Record<string, unknown>).service === "strata"
+}
+
+function finiteOrZero(value: unknown): number {
+  return typeof value === "number" && Number.isFinite(value) ? value : 0
+}
+
+/**
+ * Map a Strata `/metrics.live` object onto the shared tracker. Strata reports
+ * the rates itself, so no delta classification is needed: `state` says which
+ * phase is active and `prefill_tok_s_mean` / `tok_s` carry the rate.
+ */
+export function mapStrataLive(live: unknown, tracker: TrackerState): void {
+  const l = live && typeof live === "object" ? (live as Record<string, unknown>) : {}
+  const state = typeof l.state === "string" ? l.state : ""
+
+  if (state === "reading") {
+    tracker.isPrefilling = true
+    tracker.isGenerating = false
+    tracker.prefillSlotId = 0
+    tracker.lastPrefillRate = finiteOrZero(l.prefill_tok_s_mean)
+    tracker.generateSlotId = null
+    tracker.generatePrevNd = 0
+    tracker.generateStartAt = 0
+    tracker.lastGeneratedTps = 0
+  } else if (state === "generating") {
+    tracker.isGenerating = true
+    tracker.isPrefilling = false
+    tracker.generateSlotId = 0
+    tracker.lastGeneratedTps = finiteOrZero(l.tok_s)
+    tracker.prefillSlotId = null
+    tracker.prefillCapturedTokens = null
+    tracker.prefillStartAt = 0
+    tracker.lastPrefillRate = 0
+  } else {
+    tracker.isPrefilling = false
+    tracker.isGenerating = false
+    tracker.prefillSlotId = null
+    tracker.prefillCapturedTokens = null
+    tracker.prefillStartAt = 0
+    tracker.lastPrefillRate = 0
+    tracker.generateSlotId = null
+    tracker.generatePrevNd = 0
+    tracker.generateStartAt = 0
+    tracker.lastGeneratedTps = 0
+  }
+}