firebase云函数中的权限被拒绝

在 firebase 云功能中，我在读取或写入实时数据库时在 admin-firebase 上被拒绝访问。 这https://github.com/firebase/firebase-functions/issues/16没有解决我的问题，App Engine默认服务帐户权限设置为编辑器。

我还使用服务帐户密钥配置了 Node.js 管理 sdk，一切都按预期工作。

我已经在数据库中设置了默认的安全规则。

这是一个示例函数

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);
admin.database.enableLogging(true);

//event fires properly
exports.sendNotif = functions.database.ref('/messages/{roomId}/{msgKey}')
    .onWrite(event => {
        const message = event.data.val().text;
    //this executes as expected
        console.log(message);

//here I am getting access denied and consequently function timeout after 60 seconds.
        return admin.database().ref('/userFCMTokens').once('value')
            .then(snap => console.log(snap.val()));
    });

这是来自 firebase 实时数据库的日志片段

Realtime connection established.  
2017-06-08T15:19:03.168Z I sendNotif: p:0: connection ready  
2017-06-08T15:19:03.168Z I sendNotif: p:0: {"r":28,"a":"gauth","b":{"cred”:”********************”}}  
2017-06-08T15:19:03.169Z I sendNotif: p:0: Listen on /userFCMTokens for default  
2017-06-08T15:19:03.169Z I sendNotif: p:0: {"r":29,"a":"q","b":{"p":"/userFCMTokens","h":""}}  
2017-06-08T15:19:03.538Z I sendNotif: p:0: from server: {"r":28,"b":{"s":"permission_denied","d":"Access denied."}}  
2017-06-08T15:19:03.538Z I sendNotif: Auth token revoked: permission_denied/Access denied. 
2017-06-08T15:19:03.538Z I sendNotif: c:0:13: Closing realtime connection.  
2017-06-08T15:19:03.538Z I sendNotif: c:0:13: Shutting down all connections  
2017-06-08T15:19:03.538Z I sendNotif: c:0:13:0 WebSocket is being closed 

为了简洁起见，这里没有登录实时数据库：

2017-06-08T15:26:23.164035495Z D sendNotif: Function execution started
2017-06-08T15:26:23.164076543Z D sendNotif: Billing account not configured. External network is not accessible and quotas are severely limited. Configure billing account to remove these restrictions
2017-06-08T15:26:23.539Z I sendNotif: message console logged
2017-06-08T15:27:23.165321703Z D sendNotif: Function execution took 60002 ms, finished with status: 'timeout'

为什么我无法在云函数中使用admin进行读写？

尝试检查“App Engine 默认服务帐户”的权限https://console.cloud.google.com/iam-admin/iam/project，并确保它显示“编辑器”。