"Converting Text from a Streamed XML-Like File into CSV: A Step-by-Step Guide

I have log files that contain C++ namespace artifacts (indicated by the double colons ::) and XML content embedded within them. After loading and displaying the logs in a browser application, the content has been separated from the Unix timestamps like so:

1564002293071 INFO:  ToGroundMessageFilter::addSubscriptionAddress staged subscribe address [uxas.messages.uxnative.KillSer
1564002293073 INFO:  *** INITIALIZING:: Service[ToGroundMessageFilter] Service Id[64] with working directory [] *** 
1564002293082 INFO:  WorldviewTransformationService::configure Location offsets = (lat:0, lon:0, alt:0)
1564002311397 INFO:  WatchdogManagerService::<WaypointActual Series="TACE"><Waypoint><Waypoint Series="TACE"><RemediationId>1</RemediationId><StatePlatformId>58</StatePlatformId><LatLonAlt><LatLonAlt Series="TACE"><Altitude>366</Altitude><Latitude>34.97866</Latitude><Longitude>-117.85169</Longitude></LatLonAlt></LatLonAlt><Speed>0</Speed><Heading>0</Heading><Roll>0</Roll><Pitch>0</Pitch><Yaw>0</Yaw></Waypoint></Waypoint><SenderID>68</SenderID><ActualTime>0</ActualTime><PerceivedTime>0</PerceivedTime><SenderPlatformWorld>Constructive</SenderPlatformWorld><SenderPlatformType>Other</SenderPlatformType><Comment></Comment></WaypointActual>
1564002312386 INFO:  ProximityConstraintService::<WatchdogConstraintViolation Series="TACE"><ConstraintId>-2</ConstraintId><Latching>true</Latching><Priority>1</Priority><RequestedRemediationId>1</RequestedRemediationId><HasViolation>false</HasViolation><ConstraintName>Proximity</ConstraintName><SenderID>72</SenderID><ActualTime>1564002312385</ActualTime><PerceivedTime>1564002312385</PerceivedTime><SenderPlatformWorld>Live</SenderPlatformWorld><SenderPlatformType>Air</SenderPlatformType><Comment></Comment></WatchdogConstraintViolation>

The next step is to parse out this log and save it as a CSV using JavaScript. However, the challenge lies in the fact that the contents per line are not only XML. JavaScript has XML object parsers, but how do we approach this if the lines are a mix? The goal is to create a CSV with columns for the Unix timestamp, namespace names, and other details (as shown in the sample table below).

Additionally, we have the format of each event namespace. Below are examples of two structured like XML configurations. These configurations are subject to updates as the software evolves. There are about 24+ XML structured "services" defined similarly. Is there a way to have the parser "load XML configs" based on the service name?

WorldViewTransformationService

<AutonomyWaypointActual Series="TACE">
    <Waypoint>
        <Waypoint Series="TACE">
            <RemediationId></RemediationId>
            <StatePlatformId></StatePlatformId>
            <LatLonAlt>
                <LatLonAlt Series="TACE">
                    <Altitude></Altitude>
                    <Latitude></Latitude>
                    <Longitude></Longitude>
                </LatLonAlt>
            </LatLonAlt>
            <Speed></Speed>
            <Heading></Heading>
            <Roll></Roll>
            <Pitch></Pitch>
            <Yaw></Yaw>
        </Waypoint>
    </Waypoint>
    <SenderID></SenderID>
    <ActualTime></ActualTime>
    <PerceivedTime></PerceivedTime>
    <SenderPlatformWorld></SenderPlatformWorld>
    <SenderPlatformType></SenderPlatformType>
    <Comment></Comment>
</AutonomyWaypointActual>

ProximityConstraintService

<ProximityConstraint Series="TACE">
    <Radius></Radius>
    <OtherPlatformId></OtherPlatformId>
    <ConstraintId></ConstraintId>
    <PlatformId></PlatformId>
    <Latching></Latching>
    <Priority></Priority>
    <RequestedRemediationId></RequestedRemediationId>
    <ConstraintName></ConstraintName>
</ProximityConstraint>

Sample CSV output: (Events like ProximityConstraintService do not have altitude, pitch, or yaw information.)

unix           |  event                         | altitude | pitch | yaw | Priority | Latching
1564002293071    ToGroundMessageFilter               -         -      -       -          -
1564002293073    INITIALIZING                        -         -      -       -          -
1564002293082    WorldviewTransformationService     100        15     4       -          -
1564002300983    WorldviewTransformationService     220        16     2       -          -
1564002312386    ProximityConstraintService          -         -      -       3          1
javascriptxmlcsvparsing

Answer №1

There are various methods to accomplish this task.

If you prefer to correctly parse XML (which is the recommended approach), you could take a simpler approach by converting the logfile to proper XML in two steps. First, transform the logfile into proper XML format, then utilize standard XML parsing tools to generate CSV output from the formatted XML.

It's important to pay attention to the specifics, so if this technique doesn't suit your needs, please inform us. Here's a suggested methodology:

1) Filter the log to retain only the relevant lines;

2) Enclose all desired log messages in a generic logentry XML structure, placed under a root tag, creating a structure like this:

<logfile>
  ...
  <logentry timestamp="1564002311397" level="INFO" source="WatchdogManagerService">
    <WaypointActual Series="TACE"><Waypoint>...</WaypointActual>
  </logentry>
  <logentry ...>...</logentry>
  ...
</logfile>

3) Convert the resulting XML into CSV format using XSLT or another suitable processor.

The only challenge is handling over 24 different XML formats automatically to ensure correct CSV output. You may need to create separate XSLT templates for each XML format, but these can be consolidated into one XSLT file for convenient application to the entire logfile in one pass.

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