使用應用腳本URLFetchApp訪問Google數據存儲數據

Question

我想通過Apps腳本試用Google數據存儲，因爲我有一個基於Google工作表的當前解決方案，該解決方案遇到了與Drive文件不斷交易時固有的超時問題。我使用服務帳戶在Google雲中創建了一個測試項目，並啓用了庫MZx5DzNPsYjVyZaR67xXJQai_d-phDA33 （cGoa）來處理Oauth2工作。我按照指南啓動它here並得到了與我的令牌一起工作的所有相關確認（並且刪除令牌會引發'驗證失敗提示'）。

現在我要開始一個基本的查詢，顯示我已經放在一個實體，我可以使用API​​瀏覽器here並運行此查詢的身體：

{ 
    "query": {} 
} 

，並得到這樣的結果：

{ 
"batch": { 
"entityResultType": "FULL", 
"entityResults": [ 
    { 
    "entity": { 
     "key": { 
     "partitionId": { 
      "projectId": "project-id-5200707333336492774" 
     }, 
     "path": [ 
      { 
      "kind": "Transaction", 
      "id": "5629499534213120" 
      } 
     ] 
     }, 
     "properties": { 
     "CommentIn": { 
      "stringValue": "My First Test Transaction" 
     }, 
     "Status": { 
      "stringValue": "Closed" 
     }, 
     "auditStatus": { 
      "stringValue": "Logged" 
     }, 
     "User": { 
      "stringValue": "John Doe" 
     }, 
     "Start": { 
      "timestampValue": "2017-08-17T18:07:04.681Z" 
     }, 
     "CommentOut": { 
      "stringValue": "Done for today!" 
     }, 
     "End": { 
      "timestampValue": "2017-08-17T20:07:38.058Z" 
     }, 
     "Period": { 
      "stringValue": "08/16/2017-08/31/2017" 
     } 
     } 
    }, 
    "cursor": "CkISPGogc35whh9qZWN0LWlkLTUyMDA3MDcwODA1MDY0OTI3NzRyGAsSC1RyYW5zYWN0aW9uGICAgICAgIAKDBgAIAA=", 
    "version": "1503004124243000" 
    } 
], 
"endCursor": "CkISPGogc35wcm9qZWN0LWlkLTUyMDAxxDcwODA1MDY0OTI3NzRyGAsSC1RyYW5zYWN0aW9uGICAgICAgIAKDBgAIAA=", 
"moreResults": "NO_MORE_RESULTS" 
} 
} 

我嘗試做同樣的事情，此代碼：

function doGet(e) 
    { 
    var goa = cGoa.GoaApp.createGoa('Oauth2-Service-Account', 

    PropertiesService.getScriptProperties()).execute(e); 
    if(goa.hasToken()) {var token = goa.getToken();} 

     var payload = {"query":{}} 
      ; 

     var result = UrlFetchApp.fetch('https://datastore.googleapis.com/v1/projects/project-id-5200707333336492774:runQuery', 
        { 
         method: "POST", 
         headers: {authorization: "Bearer " + goa.getToken()}, 
     muteHttpExceptions : true, 
         payload: payload 
        }); 



     Logger.log(result.getBlob().getDataAsString()); 
      } 

，並得到這個電子RROR在記錄器：

"error": { 
    "code": 400, 
    "message": "Invalid JSON payload received. Unknown name \"query\": Cannot bind query parameter. 'query' is a message type. Parameters can only be bound to primitive types.", 
    "status": "INVALID_ARGUMENT", 
    "details": [ 
     { 
     "@type": "type.googleapis.com/google.rpc.BadRequest", 
     "fieldViolations": [ 
      { 
      "description": "Invalid JSON payload received. Unknown name \"query\": Cannot bind query parameter. 'query' is a message type. Parameters can only be bound to primitive types." 
      } 
     ] 
     } 
    ] 
    } 
} 

如果我嘗試用另一個詞，如「資源」或「GqlQuery」，我得到這個錯誤：

"error": { 
    "code": 400, 
    "message": "Invalid JSON payload received. Unknown name \"GqlQuery\": Cannot bind query parameter. Field 'GqlQuery' could not be found in request message.", 
    "status": "INVALID_ARGUMENT", 
    "details": [ 
     { 
     "@type": "type.googleapis.com/google.rpc.BadRequest", 
     "fieldViolations": [ 
      { 
      "description": "Invalid JSON payload received. Unknown name \"GqlQuery\": Cannot bind query parameter. Field 'GqlQuery' could not be found in request message." 
      } 
     ] 
     } 
    ] 
    } 
} 

我無法從API文檔告訴我的語法應該是什麼。任何人都可以告訴我如何編寫一個功能請求體從Apps腳本到數據存儲？

Answer 1

你需要設置你的有效載荷的的contentType以及字符串化的JSON有效載荷如下：

var result = UrlFetchApp.fetch(
    'https://datastore.googleapis.com/v1/projects/project-id-5200707333336492774:runQuery', 
    { 
     'method':'post', 
     'contentType':'application/json', 
     'headers': {authorization: "Bearer " + goa.getToken()}, 
     'payload':JSON.stringify(payload) 
    } 
);