TRAINING-Jenkinsfile

APP_NAME = "embcess-training"
PROJECT_NAMESPACE = "jhnamn"

class AppEnvironment {
  String name
  String tag
  String previousTag
}

// EDIT LINE BELOW (Edit your environment TAG names)
environments = [
  dev:new AppEnvironment(name:"Development",tag:"dev",previousTag:"dev-previous"),
  test:new AppEnvironment(name:"Test",tag:"test",previousTag:"training-previous"),
  prod:new AppEnvironment(name:"Prod",tag:"prod",previousTag:"prod-previous")
]

// You shouldn't have to edit these if you're following the conventions
ARTIFACT_BUILD = APP_NAME
RUNTIME_CHAINED_BUILD = "${APP_NAME}"

IMAGESTREAM_NAME = "${APP_NAME}"

PATHFINDER_URL = "pathfinder.bcgov"


// Gets the container hash for the PROD image in an image stream
def getLatestHash(imageStreamName) {
  return sh (
    script: """oc get istag ${imageStreamName}:training -o=jsonpath='{@.image.metadata.name}' | sed -e 's/sha256://g'""",
    returnStdout: true
  ).trim()
}

// Gets all tags already applied to this ImageStream (as a single string); e.g., 'dev test dev-previous my-other-tag ...'
def getAllTags(imageStreamName) {
  return sh (
    script: """oc get is ${imageStreamName} -o template --template='{{range .status.tags}}{{" "}}{{.tag}}{{end}}'""",
    returnStdout: true
  ).trim()
}

// Checks whether we are running this pipeline for the first time by looking at what tags are available on the application's ImageStream
def tagExists(tagName, imageStream) {
  def tags = getAllTags(imageStream)
  def entries = tags.split(" ")
  for (entry in entries) {
    if (entry == tagName) {
      return true
    }
  }
  return false
}

def buildAndVerify(buildConfigName) {
  echo "Building: ${buildConfigName}"
  openshiftBuild(
    bldCfg: buildConfigName,
    showBuildLogs: 'true',
    waitTime: '1200000'
  )
  openshiftVerifyBuild(
    bldCfg: buildConfigName,
    showBuildLogs: 'true',
    waitTime: '1200000'
  )
}

def tagImage(srcHash, destination, imageStream) {
  openshiftTag(
    destStream: imageStream,
    verbose: 'true',
    destTag: destination,
    srcStream: imageStream,
    srcTag: srcHash,
    waitTime: '1200000'
  )
}

// Keeps a copy of last good known configuration for a deployment (just in case)
def tagLatestStable(environment, backupTag, imageStream) {
  // skip this on the first run... there's nothing to backup!
  if (tagExists(environment, imageStream)) {
    tagImage(environment, backupTag, imageStream)
  }
}

def deployAndVerify(srcHash, environment, imageStream) {
  echo "Deploying ${APP_NAME} to ${environment}"
  tagImage(srcHash, environment, imageStream)
  // verify deployment to an environment; e.g. [your-project-name]-dev
  openshiftVerifyDeployment(
    deploymentConfig: "${APP_NAME}",
    namespace: "${PROJECT_NAMESPACE}-test",
    waitTime: '1200000'
  )
}

// Generates a string representation of the current code changes that triggered a build
def getChangeString() {
  def MAX_MSG_LEN = 512
  def changeString = ""
  def changeLogSets = currentBuild.changeSets
  for (int i = 0; i < changeLogSets.size(); i++) {
     def entries = changeLogSets[i].items
     for (int j = 0; j < entries.length; j++) {
         def entry = entries[j]
         truncated_msg = entry.msg.take(MAX_MSG_LEN)
         changeString += " - ${truncated_msg} [${entry.author}]\n"
     }
  }
  if (!changeString) {
     changeString = "No changes"
  }
  return changeString
}

def notifyGood(title, description) {
  // TODO: Send notifications to Slack
  echo title
  if (description) {
    echo description
  }
}

def notifyError(title, description) {
  // TODO: Send notifications to Slack
  echo title
  if (description) {
    echo description
  }
}

node('master') {

    stage('Startup') {
        // stop pending builds.
        sh "oc cancel-build bc/${RUNTIME_CHAINED_BUILD}"
    }

    stage('Build') {        
		echo "Building Application image..."
		buildAndVerify(ARTIFACT_BUILD)
		
		IMAGE_HASH = getLatestHash(IMAGESTREAM_NAME)
		echo ">> IMAGE_HASH: ${IMAGE_HASH}"
	  	  
    }

      stage("Deploy to ${environments.test.name}") {
	  def environment = environments.test.tag
	  def stableTag = environments.test.previousTag
	  node {
		try {

		  // hold on to a copy of the last stable TEST environment (in case the upcoming deployment fails...)
		  tagLatestStable("training", "training-previous", IMAGESTREAM_NAME)
		  IMAGE_HASH = getLatestHash(IMAGESTREAM_NAME)
		  deployAndVerify(IMAGE_HASH, environment, IMAGESTREAM_NAME)
		  // all is good!
		  notifyGood(
			"New ${APP_NAME} in ${environment} :)",
			"Changes: ${getChangeString()}"
		  )
		} catch(error) {
		  notifyError(
			"Couldn't deploy ${APP_NAME} to ${environment} :(",
			"Error: '${error.message}'"
		  )
		  throw error
		}
	  }
   }
}