feat: add Prometheus metrics parser for llama-swap GPU series

src/lib/metrics-parser.ts

@@ -0,0 +1,67 @@
+export interface PromSample {
+  metric: string;
+  labels: Record<string, string>;
+  value: number;
+}
+
+const LINE_RE = /^([A-Za-z_:][A-Za-z0-9_:]*)(?:\{([^}]*)\})?\s+(-?(?:\d+\.?\d*|\.\d+)(?:[eE][+-]?\d+)?)$/;
+
+export function parsePrometheus(text: string): PromSample[] {
+  const samples: PromSample[] = [];
+  for (const rawLine of text.split("\n")) {
+    const line = rawLine.trim();
+    if (!line || line.startsWith("#")) continue;
+    const m = LINE_RE.exec(line);
+    if (!m) continue;
+    const labels: Record<string, string> = {};
+    if (m[2]) {
+      for (const pair of m[2].split(",")) {
+        const eq = pair.indexOf("=");
+        if (eq === -1) continue;
+        const value = pair.slice(eq + 1).trim();
+        labels[pair.slice(0, eq).trim()] = value.replace(/^"(.*)"$/, "$1");
+      }
+    }
+    samples.push({ metric: m[1], labels, value: parseFloat(m[3]) });
+  }
+  return samples;
+}
+
+export type GpuMetricKind = "util_percent" | "memory_util_percent" | "temperature" | "power" | "fan";
+
+export const GPU_SERIES: Record<string, GpuMetricKind> = {
+  llamaswap_gpu_util_percent: "util_percent",
+  llamaswap_gpu_memory_util_percent: "memory_util_percent",
+  llamaswap_gpu_temperature_celsius: "temperature",
+  llamaswap_gpu_power_draw_watts: "power",
+  llamaswap_gpu_fan_speed_percent: "fan",
+};
+
+export interface GpuSample {
+  id: string;
+  name: string;
+  kind: GpuMetricKind;
+  value: number;
+}
+
+export function parseGpuMetrics(text: string): GpuSample[] {
+  const out: GpuSample[] = [];
+  for (const s of parsePrometheus(text)) {
+    const kind = GPU_SERIES[s.metric];
+    if (!kind) continue;
+    const id = s.labels["id"];
+    if (id === undefined) continue;
+    out.push({ id, name: s.labels["name"] ?? "", kind, value: s.value });
+  }
+  return out;
+}
+
+export function gpuInfos(samples: GpuSample[]): { id: string; name: string }[] {
+  const byId = new Map<string, string>();
+  for (const s of samples) {
+    if (!byId.has(s.id)) byId.set(s.id, s.name);
+  }
+  return [...byId.entries()]
+    .sort((a, b) => parseInt(a[0], 10) - parseInt(b[0], 10))
+    .map(([id, name]) => ({ id, name }));
+}