chore: initial import

apps/visualizer/src/lib/hasura.ts

@@ -0,0 +1,115 @@
+export type DriftTick = {
+  ts: string;
+  market_index: number;
+  symbol: string;
+  oracle_price: number;
+  mark_price?: number | null;
+  oracle_slot?: number | null;
+  source?: string;
+};
+
+type GraphQLError = { message: string };
+
+function getApiUrl(): string | undefined {
+  const v = (import.meta as any).env?.VITE_API_URL;
+  if (v) return String(v);
+  // Default to same-origin API proxy at /api (Vite dev server proxies /api -> trade-api).
+  return '/api';
+}
+
+function getHasuraUrl(): string {
+  return (import.meta as any).env?.VITE_HASURA_URL || 'http://localhost:8080/v1/graphql';
+}
+
+function getAuthToken(): string | undefined {
+  const v = (import.meta as any).env?.VITE_HASURA_AUTH_TOKEN;
+  return v ? String(v) : undefined;
+}
+
+function getAdminSecret(): string | undefined {
+  const v = (import.meta as any).env?.VITE_HASURA_ADMIN_SECRET;
+  return v ? String(v) : undefined;
+}
+
+export async function hasuraRequest<T>(query: string, variables: Record<string, unknown>): Promise<T> {
+  const headers: Record<string, string> = {
+    'content-type': 'application/json',
+  };
+  const token = getAuthToken();
+  if (token) {
+    headers.authorization = `Bearer ${token}`;
+  } else {
+    const secret = getAdminSecret();
+    if (secret) headers['x-hasura-admin-secret'] = secret;
+  }
+
+  const res = await fetch(getHasuraUrl(), {
+    method: 'POST',
+    headers,
+    body: JSON.stringify({ query, variables }),
+  });
+
+  const text = await res.text();
+  if (!res.ok) throw new Error(`Hasura HTTP ${res.status}: ${text}`);
+
+  const json = JSON.parse(text) as { data?: T; errors?: GraphQLError[] };
+  if (json.errors?.length) throw new Error(json.errors.map((e) => e.message).join(' | '));
+  if (!json.data) throw new Error('Hasura: empty response');
+  return json.data;
+}
+
+export async function fetchLatestTicks(symbol: string, limit: number, source?: string): Promise<DriftTick[]> {
+  const apiUrl = getApiUrl();
+  if (apiUrl) {
+    const u = new URL(apiUrl, window.location.origin);
+    u.pathname = u.pathname && u.pathname !== '/' ? u.pathname.replace(/\/$/, '') + '/v1/ticks' : '/v1/ticks';
+    u.searchParams.set('symbol', symbol);
+    u.searchParams.set('limit', String(limit));
+    if (source && source.trim()) u.searchParams.set('source', source.trim());
+
+    const res = await fetch(u.toString());
+    const text = await res.text();
+    if (!res.ok) throw new Error(`API HTTP ${res.status}: ${text}`);
+    const json = JSON.parse(text) as { ok?: boolean; ticks?: any[]; error?: string };
+    if (!json.ok) throw new Error(json.error || 'API: error');
+
+    return (json.ticks || []).map((t: any) => ({
+      ts: String(t.ts),
+      market_index: Number(t.market_index),
+      symbol: String(t.symbol),
+      oracle_price: Number(t.oracle_price),
+      mark_price: t.mark_price == null ? null : Number(t.mark_price),
+      oracle_slot: t.oracle_slot == null ? null : Number(t.oracle_slot),
+      source: t.source == null ? undefined : String(t.source),
+    }));
+  }
+
+  const where: any = { symbol: { _eq: symbol } };
+  if (source && source.trim()) where.source = { _eq: source.trim() };
+
+  const query = `
+    query LatestTicks($where: drift_ticks_bool_exp!, $limit: Int!) {
+      drift_ticks(where: $where, order_by: {ts: desc}, limit: $limit) {
+        ts
+        market_index
+        symbol
+        oracle_price
+        mark_price
+        oracle_slot
+        source
+      }
+    }
+  `;
+
+  const data = await hasuraRequest<{
+    drift_ticks: Array<Omit<DriftTick, 'oracle_price' | 'mark_price'> & { oracle_price: any; mark_price?: any }>;
+  }>(query, { where, limit });
+
+  return data.drift_ticks
+    .map((t) => ({
+      ...t,
+      oracle_price: Number(t.oracle_price),
+      mark_price: t.mark_price == null ? null : Number(t.mark_price),
+    }))
+    .reverse();
+}