Catch down network exception and non-object responses in fetch

src/Collections/TerminusCollection.php

@@ -9,15 +9,18 @@
 use Pantheon\Terminus\Models\TerminusModel;
 use Pantheon\Terminus\Request\RequestAwareInterface;
 use Pantheon\Terminus\Request\RequestAwareTrait;
+use Psr\Log\LoggerAwareInterface;
+use Psr\Log\LoggerAwareTrait;
 
 /**
  * Class TerminusCollection
  * @package Pantheon\Terminus\Collections
  */
-abstract class TerminusCollection implements ContainerAwareInterface, RequestAwareInterface
+abstract class TerminusCollection implements ContainerAwareInterface, RequestAwareInterface, LoggerAwareInterface
 {
     use ContainerAwareTrait;
     use RequestAwareTrait;
+    use LoggerAwareTrait;
 
     /**
      * @var array
@@ -91,6 +94,34 @@ public function all()
     public function fetch()
     {
         foreach ($this->getData() as $id => $model_data) {
+            if (!is_object($model_data)) {
+                // This should always be an object, however occasionally it is returning as a string
+                // We need more information about what it is and to handle the error
+                $model_data_str = print_r($model_data, true);
+                $error_maxlength = 250;
+                if (is_string($model_data_str) && strlen($model_data_str) > $error_maxlength) {
+                    $model_data_str = substr($model_data_str, 0, $error_maxlength) . ' ...';
+                }
+                $error_message = "Fetch failed {file}:{line} \$model_data expected as object but returned as {type}.";
+                $error_message .= "\nUnexpected value: {model_data_str}";
+                $trace = debug_backtrace();
+                $context = [
+                    'file' => $trace[0]['file'],
+                    'line' => $trace[0]['line'],
+                    'type' => gettype($model_data),
+                    'model_data_str' => $model_data_str
+                ];
+
+                // verbose logging for debugging
+                $this->logger->debug($error_message, $context);
+
+                // less information for more user-facing messages, but a problem has occurred and we're skipping this
+                // item so we should still surface a user-facing message
+                $this->logger->warning("Model data missing for {id}", ['id' => $id,]);
+
+                // skip this item since it lacks useful data
+                continue;
+            }
             if (!isset($model_data->id)) {
                 $model_data->id = $id;
             }

src/Request/Request.php

@@ -244,12 +244,21 @@ private function createRetryDecider(): callable
                 }
             }
 
+            // Response can be null if there is a network disconnect.  Get a different error message in that case.
+            if (is_object($response) && is_object($response->getBody()) && $response->getBody()->getContents() !== '') {
+                $error = $response->getBody()->getContents();
+            } elseif (null !== $exception && '' != $exception->getMessage()) {
+                $error = $exception->getMessage();
+            } else {
+                $error = "Undefined";
+            }
+
             $this->logger->error(
                 "HTTP request {method} {uri} has failed with error {error}.",
                 [
                     'method' => $request->getMethod(),
                     'uri' => $request->getUri(),
-                    'error' => $response->getBody()->getContents(),
+                    'error' => $error,
                 ]
             );