Fix invoke error reporting. (#3048)

- Report all failures
- Use appropriate member functions to access failure details

Fixes https://github.com/pulumi/pulumi-terraform/issues/396

CHANGELOG.md

@@ -11,6 +11,9 @@ CHANGELOG
 - Fix a bug in the GitHub Actions program preventing errors from being rendered in the Actions log on github.com.
   [#3036](https://github.com/pulumi/pulumi/pull/3036)
 
+- Fix a bug in the Node.JS SDK that caused failure details for provider functions to go unreported.
+  [#3048](https://github.com/pulumi/pulumi/pull/3048)
+
 ## 0.17.28 (2019-08-05)
 
 - Retry renaming a temporary folder during plugin installation

sdk/nodejs/runtime/invoke.ts

@@ -83,7 +83,14 @@ export async function invoke(tok: string, props: Inputs, opts?: InvokeOptions):
         // If there were failures, propagate them.
         const failures: any = resp.getFailuresList();
         if (failures && failures.length) {
-            throw new Error(`Invoke of '${tok}' failed: ${failures[0].reason} (${failures[0].property})`);
+            let reasons = "";
+            for (let i = 0; i < failures.length; i++) {
+                if (reasons !== "") {
+                    reasons += "; ";
+                }
+                reasons += `${failures[i].getReason()} (${failures[i].getProperty()})`;
+            }
+            throw new Error(`Invoke of '${tok}' failed: ${reasons}`);
         }
 
         // Finally propagate any other properties that were given to us as outputs.