Connect Golang to Datastore

<p>Hi, I&#39;m doing connect golang to cloud datastore, but document app server -&gt; server need service account keys. I&#39;m following doing (<a href="https://godoc.org/google.golang.org/cloud/datastore" rel="nofollow">https://godoc.org/google.golang.org/cloud/datastore</a>) not need service account key but connect datastore, only need project ID . why ?</p> <hr/>**评论：**<br/><br/>christopherhesse: <pre><p>The Auth example on that page &#34;Example (Auth)&#34; shows how to use a service account key.</p> <p>If you don&#39;t specify any auth stuff, it probably uses google.DefaultTokenSource (<a href="https://github.com/GoogleCloudPlatform/gcloud-golang/blob/master/internal/transport/dial.go#L121" rel="nofollow">https://github.com/GoogleCloudPlatform/gcloud-golang/blob/master/internal/transport/dial.go#L121</a>) which should work fine locally if you have gcloud installed and setup or on GCE with no additional setup besides adding the correct scopes to the VM.</p></pre>