adds 'url' to log context for rendering errors

When Amphora throws an error in a location where req/res context is
available we don't currently include that context.

This commit includes 'url' in the log context to make it easy to
reproduce errors.

lib/render.js

@@ -75,7 +75,7 @@ function renderComponent(req, res, hrStart) {
     options = options || {};
 
   if (renderer instanceof Error) {
-    log('error', renderer);
+    log('error', renderer, { url: res.locals.url });
     return Promise.reject(renderer);
   }
   // Add request route params, request query params
@@ -88,7 +88,7 @@ function renderComponent(req, res, hrStart) {
     .then(cmptData => formDataForRenderer(cmptData, { _ref }, locals))
     .tap(logTime(hrStart, _ref))
     .then(({data, options}) => renderer.render(data, options, res))
-    .catch(err => log('error', err));
+    .catch(err => log('error', err, { url: res.locals.url }));
 }
 
 /**

lib/responses.js

@@ -284,7 +284,7 @@ function notFound(err, res) {
  */
 function serverError(err, res) {
   // error is required to be logged
-  log('error', err.message, { stack: err.stack });
+  log('error', err.message, { stack: err.stack, url: res.locals.url });
 
   const message = err.message || 'Server Error', // completely hide these messages from outside
     code = 500;
@@ -312,7 +312,7 @@ function unauthorized(res) {
  * @param {object} res
  */
 function clientError(err, res) {
-  log('error', err.message, { stack: err.stack });
+  log('error', err.message, { stack: err.stack, url: res.locals.url });
   // They know it's a 400 already, we don't need to repeat the fact that its an error.
   const message = removePrefix(err.message, ':'),
     code = 400;