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backend/node_modules/fastify/lib/wrapThenable.js

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+'use strict'
+
+const {
+  kReplyIsError,
+  kReplyHijacked
+} = require('./symbols')
+
+function wrapThenable (thenable, reply) {
+  thenable.then(function (payload) {
+    if (reply[kReplyHijacked] === true) {
+      return
+    }
+
+    // this is for async functions that are using reply.send directly
+    //
+    // since wrap-thenable will be called when using reply.send directly
+    // without actual return. the response can be sent already or
+    // the request may be terminated during the reply. in this situation,
+    // it require an extra checking of request.aborted to see whether
+    // the request is killed by client.
+    if (payload !== undefined || (reply.sent === false && reply.raw.headersSent === false && reply.request.raw.aborted === false)) {
+      // we use a try-catch internally to avoid adding a catch to another
+      // promise, increase promise perf by 10%
+      try {
+        reply.send(payload)
+      } catch (err) {
+        reply[kReplyIsError] = true
+        reply.send(err)
+      }
+    }
+  }, function (err) {
+    if (reply.sent === true) {
+      reply.log.error({ err }, 'Promise errored, but reply.sent = true was set')
+      return
+    }
+
+    reply[kReplyIsError] = true
+
+    // try-catch allow to re-throw error in error handler for async handler
+    try {
+      reply.send(err)
+      // The following should not happen
+      /* c8 ignore next 3 */
+    } catch (err) {
+      reply.send(err)
+    }
+  })
+}
+
+module.exports = wrapThenable