explicitly handle and process errors

Author: rgbkrk

scripts/download.js

@@ -20,26 +20,23 @@ function download(fileUrl, filename, callback) {
             writeToFile(filename, res, callback);
           });
         } else {
-          https.get(
-            url.resolve(url.parse(fileUrl).hostname, response.headers.location),
-            function(res) {
-              writeToFile(filename, res, callback);
-            }
-          );
+          https
+            .get(
+              url.resolve(
+                url.parse(fileUrl).hostname,
+                response.headers.location
+              ),
+              function(res) {
+                writeToFile(filename, res, callback);
+              }
+            )
+            .on("error", callback);
         }
       } else {
         writeToFile(filename, response, callback);
       }
     })
-    .on("error", function(err) {
-      console.error(err);
-      if (err.code === "ECONNRESET") {
-        console.error("\n** Your connection was reset. **");
-        console.error(
-          "\n** Are you behind a proxy or a firewall that is preventing a connection? **"
-        );
-      }
-    });
+    .on("error", callback);
 }
 
 module.exports = {

scripts/preinstall.js

@@ -37,6 +37,20 @@ function buildZMQ(scriptPath, zmqDir) {
   });
 }
 
+function handleError(err) {
+  if (!err) {
+    return;
+  }
+  console.error(err);
+  if (err.code === "ECONNRESET") {
+    console.error("\n** Your connection was reset. **");
+    console.error(
+      "\n** Are you behind a proxy or a firewall that is preventing a connection? **"
+    );
+  }
+  process.exit(1);
+}
+
 if (process.platform === "win32") {
   var LIB_URL =
     "https://github.com/nteract/libzmq-win/releases/download/v2.0.0/libzmq-" +
@@ -53,7 +67,10 @@ if (process.platform === "win32") {
 
   if (!fs.existsSync(FILE_NAME)) {
     console.log("Downloading libzmq for Windows");
-    download(LIB_URL, FILE_NAME, function() {
+    download(LIB_URL, FILE_NAME, function(err) {
+      if (err) {
+        handleError(err);
+      }
       console.log("Download finished");
     });
   }
@@ -84,7 +101,10 @@ if (process.platform === "win32") {
     process.exit(0);
   }
 
-  download(TAR_URL, FILE_NAME, function() {
+  download(TAR_URL, FILE_NAME, function(err) {
+    if (err) {
+      handleError(err);
+    }
     buildZMQ(SCRIPT_PATH, DIR_NAME);
   });
 }