Mule SFTP 入站端点不公开时间戳

Question

我有一个从 Mule 中的 SFTP 连接器获取文件的流程。应用程序无权删除处理后的文件。

为了防止重复处理，应用程序使用基于文件名和时间戳的幂等过滤器。

SFTP 未返回消息中每个文件的时间戳。因此，message.inboundProperties.timestamp 返回为 null。

<!-- SFTP connector -->
<sftp:connector 
    name="SFTP_Origin" 
    validateConnections="true" 
    pollingFrequency="${sftp.origin.pollingFrequency:60000}" 
    fileAge="${sftp.origin.fileAge:60000}" 
    duplicateHandling="overwrite" 
    doc:name="SFTP" 
    archiveDir="${local.archive.directory}"/>

<!-- Move XML files from one SFTP location to another location.
     Archive each file locally on the mule server in the event the file transfer fails.
     Upon failure, notify those responsible so that action can be remedied. -->
<flow name="TransferFilesViaSFTP_Flow" >
    <sftp:inbound-endpoint 
        connector-ref="SFTP_Origin" 
        host="${sftp.origin.host}" 
        port="${sftp.origin.port:22}" 
        path="${sftp.origin.path}" 
        user="${sftp.origin.user}" 
        password="${sftp.origin.password}" 
        responseTimeout="10000" 
        archiveDir="${local.archive.directory}" 
        doc:name="InboundSFTPEndpoint">
        <!-- Use RegEx filter to filter only files with within the proper date format YYYYMMdd
                             Range of dates are from 19000101 to 20991231 -->
        <file:filename-regex-filter pattern="${regex.filter:filename(.*)xml}" caseSensitive="false"/>
    </sftp:inbound-endpoint>
    <!-- Get the files via SFTP -->

    <logger 
        message="#[message]" 
        level="INFO" 
        category="sftp" 
        doc:name="Logger"/>

    <!-- Eliminate redundant file transfers by filtering out files that have 
         been transfered previously, unless their timestamp has changed. -->
    <idempotent-message-filter 
        idExpression="#[message.inboundProperties.originalFilename + '-' + 
                        message.inboundProperties.timestamp]" 
        storePrefix="prefix" 
        doc:name="Filter out redundant files transfers">
        <simple-text-file-store 
            name="filesMessages" 
            directory="${idempotent.directory}"/>
    </idempotent-message-filter>

    <!-- log event information -->
    <logger
        message="#['Payload after SFTP is ' + payload]"
        level="DEBUG"
        doc:name="Payload Logger" 
        category="sftp"/>

    <!-- Send the files to Windows Share -->
    <file:outbound-endpoint 
        path="${windows.share.path}" 
        connector-ref="WindowsShareFile" 
        responseTimeout="10000" 
        doc:name="File"/>

    <!-- log event information -->
    <logger 
        message="#['file ' + message.inboundProperties.'originalFilename' + ' successfully processed.']" 
        level="INFO" 
        category="sftp" 
        doc:name="Logger: Success"/>

    <!-- Based on property, smtp.onSuccess.sendEmail, notify when files have been moved successfully. -->
    <expression-filter 
        expression="#[${smtp.onSuccess.sendEmail:false}]" 
        doc:name="onSuccess Send Email"/>

    <set-session-variable 
        variableName="emailSubject" 
        value="#['Mule Flow Successful']" 
        doc:name="emailSubject"/>

    <flow-ref 
        name="aggregateSuccessfulFilesTransferForEmail_Subflow" 
        doc:name="aggregateSuccessfulFilesTransferForEmail_Subflow"/>

    <!-- default exception strategy -->
    <exception-strategy 
        ref="transferFilesExceptionStrategy" 
        doc:name="Reference Exception Strategy"/>
</flow>

我在 Mulesoft 上发现了一个似乎未解决的问题。 https://www.mulesoft.org/jira/browse/MULE-7175

是否有其他方法可以让我从 SFTP 连接器获取文件的时间戳？

Answer 1

如果文件小到可以放入内存：

1. 在sftp:inbound-endpoint之后将其转换为byte[]

2. 计算负载的 SHA 哈希值，而不是尝试使用远程文件的时间戳。无论如何，它会起作用并且更可靠：

   idExpression="#[message.inboundProperties.originalFilename + '-' + 
                   org.apache.commons.codec.digest.DigestUtils.sha256Hex(message.payload)]"