使用 ECONNREFUSED 在本地连接到 DynamoDB 时出现问题

Question

我正在尝试将表单提交保存到 DynamoDB 表，但是，我在本地连接时遇到了问题。我目前在本地运行 DynamoDB，但稍后我想将其移回可从 Elastic Beanstalk 访问的普通 DDB 实例。

我已将dynamodb-local 下载并解压缩到一个目录中，然后运行java -Djava.library.path=./DynamoDBLocal_lib -jar DynamoDBLocal.jar -sharedDb 命令，确保我位于适当的目录中。当我运行命令时，我得到这个：

    Initializing DynamoDB Local with the following configuration:
    Port:   8000
    InMemory:       false
    DbPath: null
    SharedDb:       true
    shouldDelayTransientStatuses:   false
    CorsParams:     *

此时，我尝试在app.js 中向我的 POST 端点提交表单，但在我本地运行 DynamoDB 的终端中出现此重复错误：

    Jan 12, 2019 1:24:25 PM com.almworks.sqlite4java.Internal log
    WARNING: [sqlite] cannot open DB[1]: 
    com.almworks.sqlite4java.SQLiteException: [-91] cannot load library: java.lang.UnsatisfiedLinkError: C:\cygwin64\home\Administrator\dynamodb_local_latest\DynamoDBLocal_lib\sqlite4java-win32-x64.dll: Access is denied
    Jan 12, 2019 1:24:25 PM com.almworks.sqlite4java.Internal log
    SEVERE: [sqlite] SQLiteQueue[shared-local-instance.db]: error running job queue
    com.almworks.sqlite4java.SQLiteException: [-91] cannot load library: java.lang.UnsatisfiedLinkError: C:\cygwin64\home\Administrator\dynamodb_local_latest\DynamoDBLocal_lib\sqlite4java-win32-x64.dll: Access is denied
        at com.almworks.sqlite4java.SQLite.loadLibrary(SQLite.java:97)
        at com.almworks.sqlite4java.SQLiteConnection.open0(SQLiteConnection.java:1441)
        at com.almworks.sqlite4java.SQLiteConnection.open(SQLiteConnection.java:282)
        at com.almworks.sqlite4java.SQLiteConnection.open(SQLiteConnection.java:293)
        at com.almworks.sqlite4java.SQLiteQueue.openConnection(SQLiteQueue.java:464)
        at com.almworks.sqlite4java.SQLiteQueue.queueFunction(SQLiteQueue.java:641)
        at com.almworks.sqlite4java.SQLiteQueue.runQueue(SQLiteQueue.java:623)
        at com.almworks.sqlite4java.SQLiteQueue.access$000(SQLiteQueue.java:77)
        at com.almworks.sqlite4java.SQLiteQueue$1.run(SQLiteQueue.java:205)
        at java.base/java.lang.Thread.run(Unknown Source)
    Caused by: java.lang.UnsatisfiedLinkError: C:\cygwin64\home\Administrator\dynamodb_local_latest\DynamoDBLocal_lib\sqlite4java-win32-x64.dll: Access is denied
        at java.base/java.lang.ClassLoader$NativeLibrary.load0(Native Method)
        at java.base/java.lang.ClassLoader$NativeLibrary.load(Unknown Source)
        at java.base/java.lang.ClassLoader$NativeLibrary.loadLibrary(Unknown Source)
        at java.base/java.lang.ClassLoader.loadLibrary0(Unknown Source)
        at java.base/java.lang.ClassLoader.loadLibrary(Unknown Source)
        at java.base/java.lang.Runtime.load0(Unknown Source)
        at java.base/java.lang.System.load(Unknown Source)
        at com.almworks.sqlite4java.Internal.tryLoadFromPath(Internal.java:340)
        at com.almworks.sqlite4java.Internal.loadLibraryX(Internal.java:117)
        at com.almworks.sqlite4java.SQLite.loadLibrary(SQLite.java:95)
        ... 9 more

在我正在运行节点工作程序集群的终端中，我从每个工作程序 (8) 收到以下错误输出，然后是 DDB 错误：

    Failed to create table in DB.
     { Error: connect ECONNREFUSED 127.0.0.1:8000
        at Object.exports._errnoException (util.js:1022:11)
        at exports._exceptionWithHostPort (util.js:1045:20)
        at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1146:14)
      message: 'connect ECONNREFUSED 127.0.0.1:8000',
      code: 'NetworkingError',
      errno: 'ECONNREFUSED',
      syscall: 'connect',
      address: '127.0.0.1',
      port: 8000,
      region: 'us-west-2',
      hostname: 'localhost',
      retryable: true,
      time: 2019-01-12T20:31:00.742Z }
    DDB Error: NetworkingError: connect ECONNREFUSED 127.0.0.1:8000

我保证我会完成这件事。这是我创建 DDB 表的代码（我将 const ddb = new AWS.DynamoDB() 作为来自 app.js 的参数传递）：

    const AWS = require('aws-sdk');

    function createDDBTable(ddb, tableName) {
        // console.log('ddb:\n',ddb);
        const tableParams = {
            AttributeDefinitions: [
                {
                    AttributeName: 'email',
                    AttributeType: 'S'
                },
                {
                    AttributeName: 'id',
                    AttributeType: 'S'
                }
            ],
            KeySchema: [
               {
                AttributeName: 'email',
                KeyType: 'HASH'
               },
               {
                    AttributeName: 'id',
                    KeyType: 'RANGE'
               }
            ],
            ProvisionedThroughput: {
                ReadCapacityUnits: 8,
                WriteCapacityUnits: 8
            },
            TableName: tableName,
            StreamSpecification: {
                StreamEnabled: false
            }
        };
        ddb.createTable(tableParams, (err, data) => {
            if(err) console.error('Failed to create table in DB.\n', err);
            else console.log('Success creating table!', data);
        })
    }
    module.exports = createDDBTable;

我不知道哪里出错了。我所有的验证和端点都可以工作，但是，当需要创建一个表时，我的代码让我在错误中磕磕绊绊。我也有一种感觉，我可能需要稍微调整一下我的options.config 文件，但我不确定如何格式化它。提前感谢您的帮助！我试图彻底解决我的问题，但如果我可以扩展其他任何内容，请告诉我。

Answer 1

使用您的计算机 IP 而不是 http://localhost:port。它会起作用的。 例如：http://xxx.yy.zz.aaa:port