feat: add CORS support, public JS SDK, and live Render vitals forwarding

2026-07-13 14:59:37 +05:30
parent b92a33d69f
commit c086bf5d27
3 changed files with 311 additions and 23 deletions
@@ -8,31 +8,56 @@ logger = logging.getLogger(__name__)

 async def forward_vitals_to_api(vitals: NormalizedVitals) -> bool:
    """
-    Attempts to POST the normalized vitals to the configured target API.
-    Returns True if successful, False otherwise.
+    Attempts to POST the normalized vitals to the configured target API
+    and to the Render cloud database.
+    Returns True if at least one forward succeeds.
    """
-    url = settings.target_api_url
+    import os
    headers = {"Content-Type": "application/json"}
    
-    if settings.api_token:
-        headers["Authorization"] = f"Bearer {settings.api_token}"
+    # 1. Forward to primary target API (e.g. Injomo Dev Workflow)
+    primary_url = settings.target_api_url
+    primary_success = False
+    if primary_url:
+        try:
+            primary_headers = headers.copy()
+            if settings.api_token:
+                primary_headers["Authorization"] = f"Bearer {settings.api_token}"
+            async with httpx.AsyncClient(timeout=10.0) as client:
+                response = await client.post(
+                    primary_url,
+                    json=vitals.model_dump(mode="json"),
+                    headers=primary_headers
+                )
+                response.raise_for_status()
+                logger.info(f"Successfully forwarded vitals to primary API for device {vitals.device_id}")
+                primary_success = True
+        except Exception as e:
+            logger.error(f"Error forwarding to primary API: {e}")

-    try:
-        async with httpx.AsyncClient(timeout=10.0) as client:
-            response = await client.post(
-                url,
-                json=vitals.model_dump(mode="json"),
-                headers=headers
-            )
-            response.raise_for_status()
-            logger.info(f"Successfully forwarded vitals for device {vitals.device_id}")
-            return True
+    # 2. Forward to Render Cloud Server
+    render_url = "https://contectfiveparamonitor.onrender.com/api/push-vitals"
+    render_success = False
+    
+    # Detect if we are already running on Render to prevent an infinite loop
+    is_on_render = os.getenv("RENDER") is not None or os.getenv("PORT") == "10000" or "render.local" in os.getenv("HOSTNAME", "")
+    
+    if not is_on_render:
+        try:
+            url_with_key = render_url
+            if settings.api_token:
+                url_with_key = f"{render_url}?api_key={settings.api_token}"
+                
+            async with httpx.AsyncClient(timeout=10.0) as client:
+                response = await client.post(
+                    url_with_key,
+                    json=vitals.model_dump(mode="json"),
+                    headers=headers
+                )
+                response.raise_for_status()
+                logger.info(f"Successfully forwarded vitals to Render Cloud for device {vitals.device_id}")
+                render_success = True
+        except Exception as e:
+            logger.error(f"Error forwarding to Render Cloud: {e}")
            
-    except httpx.HTTPStatusError as e:
-        logger.error(f"API returned HTTP {e.response.status_code}: {e.response.text}")
-    except httpx.RequestError as e:
-        logger.error(f"Request to API failed: {e}")
-    except Exception as e:
-        logger.error(f"Unexpected error forwarding to API: {e}")
-
-    return False
+    return primary_success or render_success
@@ -143,9 +143,23 @@ app = FastAPI(
    lifespan=lifespan
 )

+# Enable CORS for cross-origin app integrations (e.g. Electron apps, local dev servers)
+from fastapi.middleware.cors import CORSMiddleware
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
 # Include dashboard routes
 app.include_router(dashboard.router, prefix="/api")

+# Serve static folder
+from fastapi.staticfiles import StaticFiles
+app.mount("/static", StaticFiles(directory="static"), name="static")
+

 # === WebSocket endpoint for live vitals ===
@app.websocket("/ws/vitals")
@@ -0,0 +1,249 @@
+/**
+ * ContecVitalsClient - A reusable JavaScript client for the Contec CMS7000PLUS Patient Monitor.
+ * Works in Web, React, React Native, and Node.js environments.
+ * 
+ * Features:
+ * - Real-time streaming via WebSockets
+ * - Automatic HTTP polling fallback if WebSockets are blocked or disconnect
+ * - Exponential backoff auto-reconnection
+ * - Lifecycle callbacks for UI updates
+ */
+class ContecVitalsClient {
+  /**
+   * @param {Object} config - Client configuration options
+   * @param {string} config.baseUrl - Server URL (e.g. 'https://contectfiveparamonitor.onrender.com')
+   * @param {string} [config.deviceId] - Optional device filter (e.g. 'CMS7000PLUS_192.168.100.120')
+   * @param {number} [config.pollingInterval=3000] - Polling interval in ms if falling back to HTTP
+   * @param {function} [config.onVitals] - Callback when new vitals data arrives
+   * @param {function} [config.onStatusChange] - Callback when connection status changes ('idle', 'connecting', 'connected', 'polling', 'disconnected')
+   * @param {function} [config.onError] - Callback on error
+   */
+  constructor(config) {
+    this.baseUrl = config.baseUrl.replace(/\/$/, '');
+    this.deviceId = config.deviceId || null;
+    this.pollingInterval = config.pollingInterval || 3000;
+    
+    // Callbacks
+    this.onVitals = config.onVitals || (() => {});
+    this.onStatusChange = config.onStatusChange || (() => {});
+    this.onError = config.onError || (() => {});
+
+    // State management
+    this.ws = null;
+    this.pollTimer = null;
+    this.status = 'idle';
+    this.reconnectAttempts = 0;
+    this.maxReconnectAttempts = 5;
+    this.reconnectDelay = 1000;
+    this.isStarted = false;
+    this.lastVitalsTime = 0;
+  }
+
+  /**
+   * Start listening for vital signs.
+   */
+  start() {
+    if (this.isStarted) return;
+    this.isStarted = true;
+    this.reconnectAttempts = 0;
+    this._setStatus('connecting');
+    this._connectWebSocket();
+  }
+
+  /**
+   * Stop listening and clean up all connections/timers.
+   */
+  stop() {
+    this.isStarted = false;
+    this._clearPollTimer();
+    this._closeWebSocket();
+    this._setStatus('idle');
+  }
+
+  /**
+   * Change current status and trigger callback.
+   * @private
+   */
+  _setStatus(newStatus) {
+    if (this.status !== newStatus) {
+      this.status = newStatus;
+      this.onStatusChange(newStatus);
+    }
+  }
+
+  /**
+   * Parse the base URL to construct the WS URL.
+   * @private
+   */
+  _getWebSocketUrl() {
+    const wsProto = this.baseUrl.startsWith('https') ? 'wss' : 'ws';
+    const cleanUrl = this.baseUrl.replace(/^(https?:\/\/)/, '');
+    return `${wsProto}://${cleanUrl}/ws/vitals`;
+  }
+
+  /**
+   * Open WebSocket connection.
+   * @private
+   */
+  _connectWebSocket() {
+    this._clearPollTimer();
+    const wsUrl = this._getWebSocketUrl();
+    
+    try {
+      this.ws = new WebSocket(wsUrl);
+
+      this.ws.onopen = () => {
+        console.log('ContecVitalsClient: WebSocket connected');
+        this._setStatus('connected');
+        this.reconnectAttempts = 0;
+        this.reconnectDelay = 1000;
+      };
+
+      this.ws.onmessage = (event) => {
+        try {
+          const data = JSON.parse(event.data);
+          this._processIncomingVitals(data);
+        } catch (err) {
+          this.onError(new Error('Failed to parse incoming WS message: ' + err.message));
+        }
+      };
+
+      this.ws.onerror = (err) => {
+        this.onError(err);
+      };
+
+      this.ws.onclose = (event) => {
+        this.ws = null;
+        if (!this.isStarted) return;
+
+        console.log(`ContecVitalsClient: WebSocket closed (code: ${event.code})`);
+        
+        // Attempt reconnection
+        if (this.reconnectAttempts < this.maxReconnectAttempts) {
+          this.reconnectAttempts++;
+          const delay = this.reconnectDelay * Math.pow(2, this.reconnectAttempts - 1);
+          console.log(`ContecVitalsClient: Reconnecting in ${delay}ms (Attempt ${this.reconnectAttempts}/${this.maxReconnectAttempts})...`);
+          this._setStatus('connecting');
+          setTimeout(() => {
+            if (this.isStarted) this._connectWebSocket();
+          }, delay);
+        } else {
+          // Exceeded Max WebSocket retries -> Fallback to HTTP Polling
+          console.log('ContecVitalsClient: WebSocket connection limit exceeded. Falling back to HTTP polling.');
+          this._startPolling();
+        }
+      };
+    } catch (err) {
+      this.onError(err);
+      this._startPolling();
+    }
+  }
+
+  /**
+   * Close WebSocket connection cleanly.
+   * @private
+   */
+  _closeWebSocket() {
+    if (this.ws) {
+      // Remove event listeners to prevent onclose reconnect logic
+      this.ws.onopen = null;
+      this.ws.onmessage = null;
+      this.ws.onerror = null;
+      this.ws.onclose = null;
+      try {
+        this.ws.close();
+      } catch (e) {}
+      this.ws = null;
+    }
+  }
+
+  /**
+   * Start HTTP Polling.
+   * @private
+   */
+  _startPolling() {
+    this._closeWebSocket();
+    this._setStatus('polling');
+    this._poll();
+  }
+
+  /**
+   * Perform single HTTP poll.
+   * @private
+   */
+  async _poll() {
+    if (!this.isStarted || this.status !== 'polling') return;
+
+    try {
+      const url = `${this.baseUrl}/api/latest-readings?limit=1` + (this.deviceId ? `&device_id=${encodeURIComponent(this.deviceId)}` : '');
+      const response = await fetch(url);
+      
+      if (!response.ok) {
+        throw new Error(`HTTP error! status: ${response.status}`);
+      }
+      
+      const readings = await response.json();
+      if (Array.isArray(readings) && readings.length > 0) {
+        this._processIncomingVitals(readings[0]);
+      }
+    } catch (err) {
+      console.error('ContecVitalsClient polling error:', err.message);
+      this.onError(err);
+    }
+
+    // Schedule next poll
+    this.pollTimer = setTimeout(() => this._poll(), this.pollingInterval);
+  }
+
+  /**
+   * Clear the HTTP polling timer.
+   * @private
+   */
+  _clearPollTimer() {
+    if (this.pollTimer) {
+      clearTimeout(this.pollTimer);
+      this.pollTimer = null;
+    }
+  }
+
+  /**
+   * Normalizes and emits the vitals data payload.
+   * @private
+   */
+  _processIncomingVitals(data) {
+    if (!data) return;
+
+    // Filter by device if configured
+    if (this.deviceId && data.device_id !== this.deviceId) {
+      return;
+    }
+
+    // Normalize property names and types
+    const normalized = {
+      deviceId: data.device_id,
+      patientId: data.patient_id,
+      timestamp: data.timestamp,
+      heartRate: typeof data.heart_rate === 'number' ? Math.round(data.heart_rate) : null,
+      spo2: typeof data.spo2 === 'number' ? Math.round(data.spo2) : null,
+      temperature: typeof data.temperature === 'number' ? parseFloat(data.temperature.toFixed(1)) : null,
+      systolicBp: typeof data.systolic_bp === 'number' ? Math.round(data.systolic_bp) : null,
+      diastolicBp: typeof data.diastolic_bp === 'number' ? Math.round(data.diastolic_bp) : null,
+      mapBp: typeof data.map_bp === 'number' ? Math.round(data.map_bp) : null,
+      respiratoryRate: typeof data.respiratory_rate === 'number' ? Math.round(data.respiratory_rate) : null,
+    };
+
+    // Calculate BP display string helper
+    normalized.bloodPressureDisplay = (normalized.systolicBp && normalized.diastolicBp)
+      ? `${normalized.systolicBp}/${normalized.diastolicBp}`
+      : null;
+
+    this.onVitals(normalized);
+  }
+}
+
+// Export for ES6/Node compatibility
+if (typeof module !== 'undefined' && module.exports) {
+  module.exports = ContecVitalsClient;
+} else if (typeof window !== 'undefined') {
+  window.ContecVitalsClient = ContecVitalsClient;
+}