pipeline-logparser

A library to parse and filter logs

• workaround for https://issues.jenkins-ci.org/browse/JENKINS-54304 to help accessing/identifying logs from parallel branches
• implementation of https://stackoverflow.com/a/57351397

Content:

• it provides API to parse logs (from currentBuild or from another run or job) and append them with name of current branch/stage
  • as String for those who need to programatically parse logs
  • or as run artifacts for those who need to archive logs with branch names for later use
• it provides accessors to 'pipeline step' logs
• it provides accessors to 'Blue Ocean' logs urls for parallel branches and stages

Compatibility:

• tested with 2.190.1 & 2.263.4
• for earlier versions see version 1 (1.4.1 last tested with 2.73.3)

Table of contents

• Documentation
• Installation
• Know Limitations
• Change log

Documentation

import pipeline-logparser library

in Jenkinsfile import library like this

@Library('pipeline-logparser@2.0.1') _

identifier "pipeline-logparser" is the name of the library set by jenkins administrator in instance configuration:

• it may be different on your instance
• see below Installation

use library's functions:

after import the name of the package is logparser:

// get logs with branch prefix
def mylog = logparser.getLogsWithBranchInfo()

Detailed Documentation

see online documentation here: logparser.txt

• also available in $JOB_URL/pipeline-syntax/globals#logparser
  • visible only after the library has been imported once
  • requires configuring 'Markup Formater' as 'Safe HTML' in $JENKINS_URL/configureSecurity

this library provides functions:

• to retrieve logs with branch info (as string or as run artifacts)
• to filter logs from branches
• to retrieve direct urls to logs (Pipeline Steps & Blue Ocean)

functionalities:

• get Blue Ocean links to logs for parallel branches and stages

  • from current run

    stage ('stage1') {
      parallel (
        branch1: { echo 'in branch1' },
        branch2: { echo 'in branch2' }
      )
    }
    def blueTree = logparser.getBlueOceanUrls()
    

    result:

    blueTree = [
      [
        id:2, name:null, stage:false, parents:[], parent:null,
        url:https://mydomain.com/blue/organizations/jenkins/myjob/detail/myjob/1/pipeline,
        log:https://mydomain.com/blue/rest/organizations/jenkins/pipelines/myjob/runs/1/log/?start=0
      ],
      [
        id:4, name:stage1, stage:true, parents:[2], parent:2,
        url:https://mydomain.com/blue/organizations/jenkins/myjob/detail/myjob/1/pipeline/4,
        log:https://mydomain.com/blue/rest/organizations/jenkins/pipelines/myjob/runs/1/nodes/4/log/?start=0
      ],
      [
        id:7, name:branch1, stage:false, parents:[4, 2], parent:4,
        url:https://mydomain.com/blue/organizations/jenkins/myjob/detail/myjob/1/pipeline/7,
        log:https://mydomain.com/blue/rest/organizations/jenkins/pipelines/myjob/runs/1/nodes/7/log/?start=0
      ],
      [
        id:8, name:branch2, stage:false, parents:[4, 2], parent:4,
        url:https://mydomain.com/blue/organizations/jenkins/myjob/detail/myjob/1/pipeline/8,
        log:https://mydomain.com/blue/rest/organizations/jenkins/pipelines/myjob/runs/1/nodes/8/log/?start=0
      ]
    ]
    

  • get Blue Ocean links from another job/run

    // get RunWrapper for current job last stable run
    // using https://github.com/gdemengin/pipeline-whitelist
    @Library('pipeline-whitelist@2.0.1') _
    def otherBuild = whitelist.getLastStableRunWrapper(whitelist.getJobByName(env.JOB_NAME))
    
    def blueTree = logparser.getBlueOceanUrls(otherBuild)
    

• retrieve logs with branch info

  • add branch prefix [branchName] in front of each line for that branch

    echo 'not in any branch'
    parallel (
      branch1: { echo 'in branch1' },
      branch2: { echo 'in branch2' }
    )
    print logparser.getLogsWithBranchInfo()
    

    result:

    not in any branch
    [branch1] in branch1
    [branch2] in branch2
    

  • show stage name with option showStages=true

    stage ('stage1') {
      echo 'in stage 1'
    }
    print logparser.getLogsWithBranchInfo(showStages: true)
    

    result:

    [stage1] in stage 1
    

  • show parent branch name (parent branch first) for nested branches

    parallel branch2: {
      echo 'in branch2'
      parallel branch21: { echo 'in branch2.branch21' }
    }
    print logparser.getLogsWithBranchInfo()
    

    result:

    [branch2] in branch2
    [branch2] [branch21] in branch2.branch21
    

  • hide parent branch name with option showParents=false

    parallel branch2: {
      echo 'in branch2'
      parallel branch21: { echo 'in branch2.branch21' }
    }
    print logparser.getLogsWithBranchInfo(showParents: false)
    

    result:

    [branch2] in branch2
    [branch21] in branch2.branch21
    

  • show VT100 markups (hidden by default as they make raw log hard to read) with option hideVT100=false

    // use node to make sure VT100 markups are in the logs
    node {
      def logs = logparser.getLogsWithBranchInfo(hideVT100: false)
      assert logs ==~ /(?s).*\x1B\[8m.*?\x1B\[0m.*/
    }
    

  • show Pipeline technical log lines (starting with [Pipeline]) with option hidePipeline=false

    echo 'not in any branch'
    parallel (
      branch1: { echo 'in branch1' },
      branch2: { echo 'in branch2' }
    )
    print logparser.getLogsWithBranchInfo(hidePipeline: false)
    

    result:

    [Pipeline] Start of Pipeline
    [Pipeline] echo
    not in any branch
    [Pipeline] parallel
    [Pipeline] [branch1] { (Branch: branch1)
    [Pipeline] [branch1] echo
    [branch1] in branch1
    [Pipeline] [branch2] { (Branch: branch2)
    [Pipeline] [branch2] echo
    [branch2] in branch2
    [Pipeline] }
    [Pipeline] }
    [Pipeline] // parallel
    

• archive logs in job artifacts (without having to allocate a node : same as ArchiveArtifacts but without node() scope)

  echo 'not in any branch'
  parallel (
    branch1: { echo 'in branch1' },
    branch2: { echo 'in branch2' }
  )
  logparser.archiveLogsWithBranchInfo('logs.txt')
  

  result: logs.txt in $BUILD_URL/artifact with content:

  not in any branch
  [branch1] in branch1
  [branch2] in branch2
  

• filter branch logs with option filter=[ list of branches to keep ]

  • filter by name

    echo 'not in any branch'
    parallel (
      branch1: { echo 'in branch1' },
      branch2: { echo 'in branch2' }
    )
    print logparser.getLogsWithBranchInfo(filter: [ 'branch1' ])
    

    result:

    [branch1] in branch1
    

  • filter multiple branches

    echo 'not in any branch'
    parallel (
      branch1: { echo 'in branch1' },
      branch2: { echo 'in branch2' },
      branch3: { echo 'in branch3' }
    )
    print logparser.getLogsWithBranchInfo(filter: [ 'branch1', 'branch3' ])
    

    result:

    [branch1] in branch1
    [branch3] in branch3
    

  • filter with regular expression

    echo 'not in any branch'
    parallel (
      branch1: { echo 'in branch1' },
      branch2: { echo 'in branch2' }
    )
    print logparser.getLogsWithBranchInfo(filter: [ '.*2' ])
    

    result:

    [branch2] in branch2
    

  • show name of nested branches filtered out

    parallel branch2: {
      echo 'in branch2'
      parallel branch21: { echo 'in branch2.branch21' }
    }
    print logparser.getLogsWithBranchInfo(filter: [ 'branch2' ])
    

    result:

    [branch2] in branch2
    <nested branch [branch2] [branch21]>
    

  • hide name of nested branches filtered out with option markNestedFiltered=false

    parallel branch2: {
      echo 'in branch2'
      parallel branch21: { echo 'in branch2.branch21' }
    }
    print logparser.getLogsWithBranchInfo(filter: [ 'branch2' ], markNestedFiltered: false)
    

    result:

    [branch2] in branch2
    

  • filter logs not in any branch

    echo 'not in any branch'
    parallel (
      branch1: { echo 'in branch1' },
      branch2: { echo 'in branch2' }
    )
    print logparser.getLogsWithBranchInfo(filter: [ null ])
    

    result:

    not in any branch
    <nested branch [branch1]>
    <nested branch [branch2]>
    

• get logs from another job/run

  // get RunWrapper for current job last stable run
  // using https://github.com/gdemengin/pipeline-whitelist
  @Library('pipeline-whitelist@2.0.1') _
  def otherBuild = whitelist.getLastStableRunWrapper(whitelist.getJobByName(env.JOB_NAME))
  
  def otherBuildLogs = logparser.getLogsWithBranchInfo([:], otherBuild)
  

• get pipeline steps tree, with links to logs, and information about parallel branches and stages

  • from current run

    stage ('stage1') {
      parallel (
        branch1: { echo 'in branch1' },
        branch2: { echo 'in branch2' }
      )
    }
    def stepsTree = logparser.getPipelineStepsUrls()
    

    result:

    stepsTree = [
      [
        id:2, name:null, stage:false, parents:[], parent:null, children:[3, 15],
        url:https://mydomain.com/job/myjob/28/execution/node/2/,
        log:null
      ],
      [
        id:3, name:null, stage:false, parents:[2], parent:2, children:[4, 14],
        url:https://mydomain.com/job/myjob/28/execution/node/3/,
        log:https://mydomain.com/job/myjob/28/execution/node/3/log
      ],
      [
        id:4, name:stage1, stage:true, parents:[3, 2], parent:3, children:[5, 13],
        url:https://mydomain.com/job/myjob/28/execution/node/4/,
        log:null
      ],
      [
        id:5, name:null, stage:false, parents:[4, 3, 2], parent:4, children:[7, 8, 10, 12],
        url:https://mydomain.com/job/myjob/28/execution/node/5/,
        log:https://mydomain.com/job/myjob/28/execution/node/5/log
      ],
      [
        id:7, name:branch1, stage:false, parents:[5, 4, 3, 2], parent:5, children:[9],
        url:https://mydomain.com/job/myjob/28/execution/node/7/,
        log:null
      ],
      [
        id:9, name:null, stage:false, parents:[7, 5, 4, 3, 2], parent:7, children:[],
        url:https://mydomain.com/job/myjob/28/execution/node/9/,
        log:https://mydomain.com/job/myjob/28/execution/node/9/log
      ],
      [
        id:8, name:branch2, stage:false, parents:[5, 4, 3, 2], parent:5, children:[11],
        url:https://mydomain.com/job/myjob/28/execution/node/8/,
        log:null
      ],
      [
        id:11, name:null, stage:false, parents:[8, 5, 4, 3, 2], parent:8, children:[],
        url:https://mydomain.com/job/myjob/28/execution/node/11/,
        log:https://mydomain.com/job/myjob/28/execution/node/11/log
      ],
      [
        id:10, name:null, stage:false, parents:[5, 4, 3, 2], parent:5, children:[],
        url:https://mydomain.com/job/myjob/28/execution/node/10/,
        log:null
      ],
      [
        id:12, name:null, stage:false, parents:[5, 4, 3, 2], parent:5, children:[],
        url:https://mydomain.com/job/myjob/28/execution/node/12/,
        log:null
      ],
      [
        id:13, name:null, stage:false, parents:[4, 3, 2], parent:4, children:[],
        url:https://mydomain.com/job/myjob/28/execution/node/13/,
        log:null
      ],
      [
        id:14, name:null, stage:false, parents:[3, 2], parent:3, children:[],
        url:https://mydomain.com/job/myjob/28/execution/node/14/,
        log:null
      ],
      [
        id:15, name:null, stage:false, parents:[2], parent:2, children:[],
        url:https://mydomain.com/job/myjob/28/execution/node/15/,
        log:null
      ]
    ]
    

  • get Pipeline Steps links from another job/run

    // get RunWrapper for current job last stable run
    // using https://github.com/gdemengin/pipeline-whitelist
    @Library('pipeline-whitelist@2.0.1') _
    def otherBuild = whitelist.getLastStableRunWrapper(whitelist.getJobByName(env.JOB_NAME))
    
    def stepsTree = logparser.getPipelineStepsUrls(otherBuild)
    

Installation

install the library as a "Global Pipeline Library" in "Manage jenkins > Configure System > Global Pipeline Library" (cf https://jenkins.io/doc/book/pipeline/shared-libraries/)

Note:

• it's also possible to copy the code in a Jenkinsfile and use functions from there
• but it would imply approving whatever needs to be in "Manage jenkins > In-process Script Approval" (including some unsafe API's)
• using this library as a "Global Pipeline Library" allows to avoid that (avoid getting access to unsafe API's)

Known limitations

• calls to logparser.getLogsWithBranchInfo() may fail (and cause job to fail) when log is too big (millions of lines, hundreds of MB of logs) because of a lack of heap space

• logs of nested stages (stage inside stage) are not correctly handled in Blue Ocean (Blue Ocean limitation)

Change log

• 1.0 (09/2019)

  • API to get edited logs with branchName (with nested branches, without VT100 markups, etc ...)
  • API to filter logs by branch name (get logs of a specific branch)
  • API to parse logs and retrieve maps of id/offsets/branchname

• 1.0.1 (11/2019)

  • fix parsing issues (when there is only one branch and when logs of 2 branches are mixed without pipeline technical logs in between)

• 1.1 (03/2020)

  • ability to set branch name to filter using regular expression
  • ability to filter more than one branch (API change : option filter is now a list)
  • ability to filter main thread (using filter = [null])
  • new option hidePipeline to filter Pipeline technical logs (default value true to hide them)
  • fix parsing issues with old version of workflow-job plugin

• 1.2 (09/2020)

  • handle logs from stages and add option showStages (default false) to show/filter them

• 1.3 (10/2020)

  • refactor to use objects available in rawbuild API (no more parsing of xml on disk)
    fixing known parsing limitations (no more need to wait a few seconds before to parse logs)
  • new API to retrieve URLs to logs of branches (Pipeline Steps URLs)
  • ability to parse logs from another run/job

• 1.4 (11/2020)

  • reformat nested branch markups when filtering is used

• 1.4.1 (02/2021)

  • optimize workflow steps parsing (avoid slowdown with large, and/or massively parallel, workflows)

• 2.0 (11/2020)

  • new API to retrieve Blue Ocean URLs to logs of branches and stages

• 2.0.1 (02/2021)

  • optimize workflow steps parsing (avoid slowdown with large, and/or massively parallel, workflows)