Add request logging

2019-08-02 17:34:00 -07:00
parent 7af4d4dc58
commit 4774e61d50
14 changed files with 112 additions and 52 deletions
--- a/modules/middleware/requestLog.js
+++ b/modules/middleware/requestLog.js
@ -0,0 +1,71 @@
+import util from 'util';
+
+// https://cloud.google.com/appengine/docs/standard/nodejs/runtime#environment_variables
+const projectId = process.env.GAE_APPLICATION;
+
+const enableDebugging = process.env.DEBUG != null;
+
+function noop() {}
+
+function createLog(req) {
+  const traceContext = req.headers['x-cloud-trace-context'];
+
+  if (projectId && traceContext) {
+    const [traceId, spanId] = traceContext.split('/');
+    const trace = `projects/${projectId}/traces/${traceId}`;
+
+    return {
+      debug: enableDebugging
+        ? (format, ...args) => {
+            console.log(
+              JSON.stringify({
+                severity: 'DEBUG',
+                'logging.googleapis.com/trace': trace,
+                'logging.googleapis.com/spanId': spanId,
+                message: util.format(format, ...args)
+              })
+            );
+          }
+        : noop,
+      info: (format, ...args) => {
+        console.log(
+          JSON.stringify({
+            severity: 'INFO',
+            'logging.googleapis.com/trace': trace,
+            'logging.googleapis.com/spanId': spanId,
+            message: util.format(format, ...args)
+          })
+        );
+      },
+      error: (format, ...args) => {
+        console.error(
+          JSON.stringify({
+            severity: 'ERROR',
+            'logging.googleapis.com/trace': trace,
+            'logging.googleapis.com/spanId': spanId,
+            message: util.format(format, ...args)
+          })
+        );
+      }
+    };
+  }
+
+  return {
+    debug: enableDebugging
+      ? (format, ...args) => {
+          console.log(util.format(format, ...args));
+        }
+      : noop,
+    info: (format, ...args) => {
+      console.log(util.format(format, ...args));
+    },
+    error: (format, ...args) => {
+      console.error(util.format(format, ...args));
+    }
+  };
+}
+
+export default function requestLog(req, res, next) {
+  req.log = createLog(req);
+  next();
+}