/**
 * Update kuberentes cluster
 *
 * Expected parameters:
 *   SALT_MASTER_CREDENTIALS                   Credentials to the Salt API.
 *   SALT_MASTER_URL                           Full Salt API address [https://10.10.10.1:8000].
 *   KUBERNETES_HYPERKUBE_SOURCE               Versioned hyperkube binary to update control plane from. Should be null if update rolling via reclass-system level
 *   KUBERNETES_HYPERKUBE_SOURCE_HASH          Versioned hyperkube binary to update control plane from. Should be null if update rolling via reclass-system level
 *   KUBERNETES_PAUSE_IMAGE                    Kubernetes pause image should have same version as hyperkube. May be null in case of reclass-system rollout
 *   TARGET_UPDATES                            Comma separated list of nodes to update (Valid values are ctl,cmp)
 *   CTL_TARGET                                Salt targeted kubernetes CTL nodes (ex. I@kubernetes:master). Kubernetes control plane
 *   CMP_TARGET                                Salt targeted compute nodes (ex. cmp* and 'I@kubernetes:pool') Kubernetes computes
 *   PER_NODE                                  Target nodes will be managed one by one (bool)
 *   SIMPLE_UPGRADE                            Use previous version of upgrade without conron/drain abilities
 *   CONFORMANCE_RUN_AFTER                     Run Kubernetes conformance tests after update
 *   CONFORMANCE_RUN_BEFORE                    Run Kubernetes conformance tests before update
 *   TEST_K8S_API_SERVER                       Kubernetes API server address for test execution
 *   ARTIFACTORY_URL                           Artifactory URL where docker images located. Needed to correctly fetch conformance images.
 *   UPGRADE_CALICO_V2_TO_V3                   Perform Calico upgrade from v2 to v3.
 *   KUBERNETES_CALICO_IMAGE                   Target calico/node image. May be null in case of reclass-system rollout.
 *   KUBERNETES_CALICO_CALICOCTL_SOURCE        Versioned calico/ctl binary. Should be null if update rolling via reclass-system level
 *   KUBERNETES_CALICO_CALICOCTL_SOURCE_HASH   Calico/ctl binary md5 hash. Should be null if update rolling via reclass-system level
 *   KUBERNETES_CALICO_CNI_SOURCE              Versioned calico/cni binary. Should be null if update rolling via reclass-system level
 *   KUBERNETES_CALICO_CNI_SOURCE_HASH         Сalico/cni binary hash. Should be null if update rolling via reclass-system level
 *   KUBERNETES_CALICO_BIRDCL_SOURCE           Versioned calico/bird binary. Should be null if update rolling via reclass-system level
 *   KUBERNETES_CALICO_BIRDCL_SOURCE_HASH      Сalico/bird binary hash. Should be null if update rolling via reclass-system level
 *   KUBERNETES_CALICO_CNI_IPAM_SOURCE         Versioned calico/ipam binary. Should be null if update rolling via reclass-system level
 *   KUBERNETES_CALICO_CNI_IPAM_SOURCE_HASH    Сalico/ipam binary hash. Should be null if update rolling via reclass-system level
 *   KUBERNETES_CALICO_KUBE_CONTROLLERS_IMAGE  Target calico/kube-controllers image. May be null in case of reclass-system rollout.
 *   CALICO_UPGRADE_VERSION                    Version of "calico-upgrade" utility to be used ("v1.0.5" for Calico v3.1.3 target).
 *
**/
import groovy.json.JsonSlurper

def common = new com.mirantis.mk.Common()
def salt = new com.mirantis.mk.Salt()
def python = new com.mirantis.mk.Python()
def test = new com.mirantis.mk.Test()

def updates = TARGET_UPDATES.tokenize(",").collect{it -> it.trim()}
def pepperEnv = "pepperEnv"

def POOL = "I@kubernetes:pool"

ETCD_ENDPOINTS = ""

def overrideKubernetesImage(pepperEnv) {
    def salt = new com.mirantis.mk.Salt()

    def k8sSaltOverrides = """
        kubernetes_hyperkube_source: ${KUBERNETES_HYPERKUBE_SOURCE}
        kubernetes_hyperkube_source_hash: ${KUBERNETES_HYPERKUBE_SOURCE_HASH}
        kubernetes_pause_image: ${KUBERNETES_PAUSE_IMAGE}
    """
    stage("Override kubernetes images to target version") {
        salt.setSaltOverrides(pepperEnv,  k8sSaltOverrides)
    }
}

def overrideCalicoImages(pepperEnv) {
    def salt = new com.mirantis.mk.Salt()

    def calicoSaltOverrides = """
        kubernetes_calico_image: ${KUBERNETES_CALICO_IMAGE}
        kubernetes_calico_calicoctl_source: ${KUBERNETES_CALICO_CALICOCTL_SOURCE}
        kubernetes_calico_calicoctl_source_hash: ${KUBERNETES_CALICO_CALICOCTL_SOURCE_HASH}
        kubernetes_calico_birdcl_source: ${KUBERNETES_CALICO_BIRDCL_SOURCE}
        kubernetes_calico_birdcl_source_hash: ${KUBERNETES_CALICO_BIRDCL_SOURCE_HASH}
        kubernetes_calico_cni_source: ${KUBERNETES_CALICO_CNI_SOURCE}
        kubernetes_calico_cni_source_hash: ${KUBERNETES_CALICO_CNI_SOURCE_HASH}
        kubernetes_calico_cni_ipam_source: ${KUBERNETES_CALICO_CNI_IPAM_SOURCE}
        kubernetes_calico_cni_ipam_source_hash: ${KUBERNETES_CALICO_CNI_IPAM_SOURCE_HASH}
        kubernetes_calico_kube_controllers_image: ${KUBERNETES_CALICO_KUBE_CONTROLLERS_IMAGE}
    """
    stage("Override calico images to target version") {
        salt.setSaltOverrides(pepperEnv, calicoSaltOverrides)
    }
}

def downloadCalicoUpgrader(pepperEnv, target) {
    def salt = new com.mirantis.mk.Salt()

    stage("Downloading calico-upgrade utility") {
        salt.cmdRun(pepperEnv, target, "rm -f ./calico-upgrade")
        salt.cmdRun(pepperEnv, target, "wget https://github.com/projectcalico/calico-upgrade/releases/download/${CALICO_UPGRADE_VERSION}/calico-upgrade")
        salt.cmdRun(pepperEnv, target, "chmod +x ./calico-upgrade")
    }
}

def performKubernetesComputeUpdate(pepperEnv, target) {
    def salt = new com.mirantis.mk.Salt()

    stage("Execute Kubernetes compute update on ${target}") {
        salt.enforceState(pepperEnv, target, 'kubernetes.pool')
        salt.runSaltProcessStep(pepperEnv, target, 'service.restart', ['kubelet'])
    }
}

def performKubernetesControlUpdate(pepperEnv, target) {
    def salt = new com.mirantis.mk.Salt()

    stage("Execute Kubernetes control plane update on ${target}") {
        salt.enforceStateWithExclude(pepperEnv, target, "kubernetes", "kubernetes.master.setup")
        // Restart kubelet
        salt.runSaltProcessStep(pepperEnv, target, 'service.restart', ['kubelet'])
    }
}

def startCalicoUpgrade(pepperEnv, target) {
    def salt = new com.mirantis.mk.Salt()

    stage("Starting upgrade using calico-upgrade: migrate etcd schema and lock Calico") {
        def cmd = "export APIV1_ETCD_ENDPOINTS=${ETCD_ENDPOINTS} && " +
                  "export APIV1_ETCD_CA_CERT_FILE=/var/lib/etcd/ca.pem && " +
                  "export APIV1_ETCD_CERT_FILE=/var/lib/etcd/etcd-client.crt && " +
                  "export APIV1_ETCD_KEY_FILE=/var/lib/etcd/etcd-client.key && " +
                  "export ETCD_ENDPOINTS=${ETCD_ENDPOINTS} && " +
                  "export ETCD_CA_CERT_FILE=/var/lib/etcd/ca.pem && " +
                  "export ETCD_CERT_FILE=/var/lib/etcd/etcd-client.crt && " +
                  "export ETCD_KEY_FILE=/var/lib/etcd/etcd-client.key && " +
                  "rm /root/upg_complete -f && " +
                  "./calico-upgrade start --no-prompts --ignore-v3-data > upgrade-start.log && " +
                  "until [ -f /root/upg_complete ]; do sleep 0.1; done && " +
                  "./calico-upgrade complete --no-prompts > upgrade-complete.log && " +
                  "rm /root/upg_complete -f"
        // "saltArgs = ['async']" doesn't work, so we have to run "cmd.run --async"
        salt.cmdRun(pepperEnv, "I@salt:master", "salt -C '${target}' cmd.run '${cmd}' --async")
        salt.cmdRun(pepperEnv, target, "until [ -f /root/upgrade-start.log ]; do sleep 0.1; done")
    }
}

def completeCalicoUpgrade(pepperEnv, target) {
    def salt = new com.mirantis.mk.Salt()

    stage("Complete upgrade using calico-upgrade: unlock Calico") {
        salt.cmdRun(pepperEnv, target, "echo 'true' > /root/upg_complete")
        salt.cmdRun(pepperEnv, target, "while [ -f /root/upg_complete ]; do sleep 0.1; done")
        salt.cmdRun(pepperEnv, target, "cat /root/upgrade-start.log")
        salt.cmdRun(pepperEnv, target, "cat /root/upgrade-complete.log")
    }
}

def performCalicoConfigurationUpdateAndServicesRestart(pepperEnv, target, ctl_node) {
    def salt = new com.mirantis.mk.Salt()

    stage("Performing Calico configuration update and services restart") {
        if (containerDenabled(pepperEnv, ctl_node)) {
            salt.enforceState(pepperEnv, target, "kubernetes.pool")
        } else {
            salt.enforceState(pepperEnv, target, "kubernetes.pool.calico")
        }
        salt.runSaltProcessStep(pepperEnv, target, 'service.restart', ['kubelet'])
    }
}

def cordonNode(pepperEnv, target) {
    def salt = new com.mirantis.mk.Salt()
    def originalTarget = "I@kubernetes:master and not ${target}"

    stage("Cordoning ${target} kubernetes node") {
        def nodeShortName = target.tokenize(".")[0]
        salt.cmdRun(pepperEnv, originalTarget, "kubectl cordon ${nodeShortName}", true, 1)
    }
}

def uncordonNode(pepperEnv, target) {
    def salt = new com.mirantis.mk.Salt()
    def originalTarget = "I@kubernetes:master and not ${target}"

    stage("Uncordoning ${target} kubernetes node") {
        def nodeShortName = target.tokenize(".")[0]
        salt.cmdRun(pepperEnv, originalTarget, "kubectl uncordon ${nodeShortName}", true, 1)
    }
}

def drainNode(pepperEnv, target) {
    def salt = new com.mirantis.mk.Salt()
    def originalTarget = "I@kubernetes:master and not ${target}"

    stage("Draining ${target} kubernetes node") {
        def nodeShortName = target.tokenize(".")[0]
        salt.cmdRun(pepperEnv, originalTarget, "kubectl drain --force --ignore-daemonsets --grace-period 100 --timeout 300s --delete-local-data ${nodeShortName}", true, 1)
    }
}

def regenerateCerts(pepperEnv, target) {
    def salt = new com.mirantis.mk.Salt()

    stage("Regenerate certs for ${target}") {
        salt.enforceState(pepperEnv, target, 'salt.minion.cert')
    }
}

def updateAddons(pepperEnv, target) {
    def salt = new com.mirantis.mk.Salt()

    stage("Upgrading Addons at ${target}") {
        salt.enforceState(pepperEnv, target, "kubernetes.master.kube-addons")
    }
}

def updateAddonManager(pepperEnv, target) {
    def salt = new com.mirantis.mk.Salt()

    stage("Upgrading AddonManager at ${target}") {
        salt.enforceState(pepperEnv, target, "kubernetes.master.setup")
    }
}

def upgradeDocker(pepperEnv, target) {
    def salt = new com.mirantis.mk.Salt()

    stage("Upgrading docker at ${target}") {
        salt.enforceState(pepperEnv, target, 'docker.host')
    }
}

def runConformance(pepperEnv, target, k8s_api, image) {
    def salt = new com.mirantis.mk.Salt()
    def containerName = 'conformance_tests'
    output_file = image.replaceAll('/', '-') + '.output'
    def output_file_full_path = "/tmp/" + image.replaceAll('/', '-') + '.output'
    def artifacts_dir = '_artifacts/'
    salt.cmdRun(pepperEnv, target, "docker rm -f ${containerName}", false)
    salt.cmdRun(pepperEnv, target, "docker run -d --name ${containerName} --net=host -e API_SERVER=${k8s_api} ${image}")
    sleep(10)

    print("Waiting for tests to run...")
    salt.runSaltProcessStep(pepperEnv, target, 'cmd.run', ["docker wait ${containerName}"], null, false)

    print("Writing test results to output file...")
    salt.runSaltProcessStep(pepperEnv, target, 'cmd.run', ["docker logs -t ${containerName} > ${output_file_full_path}"])
    print("Conformance test output saved in " + output_file_full_path)

    // collect output
    sh "mkdir -p ${artifacts_dir}"
    file_content = salt.getFileContent(pepperEnv, target, '/tmp/' + output_file)
    writeFile file: "${artifacts_dir}${output_file}", text: file_content
    sh "cat ${artifacts_dir}${output_file}"
    try {
      sh "cat ${artifacts_dir}${output_file} | grep 'Test Suite Failed' && exit 1 || exit 0"
    } catch (Throwable e) {
      print("Conformance tests failed. Please check output")
      currentBuild.result = "FAILURE"
      currentBuild.description = currentBuild.description ? e.message + " " + currentBuild.description : e.message
      throw e
    }
}

def buildImageURL(pepperEnv, target, mcp_repo) {
    def salt = new com.mirantis.mk.Salt()
    def raw_version = salt.cmdRun(pepperEnv, target, "kubectl version --short -o json")['return'][0].values()[0].replaceAll('Salt command execution success','')
    print("Kubernetes version: " + raw_version)
    def serialized_version = readJSON text: raw_version
    def short_version = (serialized_version.serverVersion.gitVersion =~ /([v])(\d+\.)(\d+\.)(\d+\-)(\d+)/)[0][0]
    print("Kubernetes short version: " + short_version)
    def conformance_image = mcp_repo + "/mirantis/kubernetes/k8s-conformance:" + short_version
    return conformance_image
}

def executeConformance(pepperEnv, target, k8s_api, mcp_repo) {
    stage("Running conformance tests") {
        def image = buildImageURL(pepperEnv, target, mcp_repo)
        print("Using image: " + image)
        runConformance(pepperEnv, target, k8s_api, image)
    }
}

def containerDinstalled(pepperEnv, target) {
    def salt = new com.mirantis.mk.Salt()
    return salt.cmdRun(pepperEnv, target, "containerd --version 2>1 1>/dev/null && echo 'true' || echo 'false'"
                       )['return'][0].values()[0].replaceAll('Salt command execution success','').trim().toBoolean()
}

def containerDenabled(pepperEnv, target) {
    def salt = new com.mirantis.mk.Salt()
    return salt.getPillar(pepperEnv, target, "kubernetes:common:containerd:enabled"
                          )["return"][0].values()[0].toBoolean()
}

def conformancePodDefExists(pepperEnv, target) {
    def salt = new com.mirantis.mk.Salt()
    return salt.cmdRun(pepperEnv, target, "test -e /srv/kubernetes/conformance.yml && echo 'true' || echo 'false'"
                       )['return'][0].values()[0].replaceAll('Salt command execution success','').trim().toBoolean()
}

def printVersionInfo(pepperEnv, target) {
    def salt = new com.mirantis.mk.Salt()
    def common = new com.mirantis.mk.Common()

    stage("Gather version and runtime information") {
        common.infoMsg("Version and runtime info:")
        salt.cmdRun(pepperEnv, target, "kubectl get no -o wide")
        common.infoMsg("Cluster health info:")
        salt.cmdRun(pepperEnv, target, "kubectl get cs")
        common.infoMsg("ETCD health info:")
        salt.cmdRun(pepperEnv, target, ". /var/lib/etcd/configenv && etcdctl cluster-health")
        common.infoMsg("Calico peers info:")
        salt.cmdRun(pepperEnv, target, "calicoctl node status")
    }
}

def calicoEnabled(pepperEnv, target) {
    def salt = new com.mirantis.mk.Salt()
    return salt.getPillar(pepperEnv, target, "kubernetes:pool:network:calico:enabled"
                          )["return"][0].values()[0].toBoolean()
}

def checkCalicoClusterState(pepperEnv, target) {
    def common = new com.mirantis.mk.Common()
    def salt = new com.mirantis.mk.Salt()

    stage("Checking Calico cluster state after upgrade") {
        // check Calico cluster and cli clients versions
        def checkVer = [
            "Client Version:": [verStr: "", dif: false, wrong: false],
            "Cluster Version:": [verStr: "", dif: false, wrong: false]
        ]
        def checkVerPassed = true
        def versionResults = salt.cmdRun(pepperEnv, target, "calicoctl version | grep -i version")['return'][0]
        versionResults.each { k, v ->
            // println("Node:\n${k}\nResult:\n${v}")
            for (verLine in v.split("\n")) {
                for (verType in checkVer.keySet()) {
                    if (verLine.contains(verType)) {
                        def verRec = checkVer[verType]
                        ver = (verLine - verType).trim()
                        if (!verRec.verStr) {
                            verRec.verStr = ver
                        }
                        if (verRec.verStr != ver) {
                            verRec.dif = true
                            checkVerPassed = false
                        }
                        version = ver.tokenize(".")
                        if ((version.size() < 3) || (version[0] != "v3")) {
                            verRec.wrong = true
                            checkVerPassed = false
                        }
                        checkVer[verType] = verRec
                    }
                }
            }
        }
        if (checkVerPassed) {
            common.infoMsg("Calico version verification passed")
        }
        else {
            def warningMsg = "Calico version verification failed.\n"
            checkVer.each { k, rec ->
                if (rec.dif) {
                    warningMsg += "${k} versions are different across nodes.\n"
                }
                if (rec.wrong) {
                    warningMsg += "${k} (some) versions are wrong - should be v3.x.\n"
                }
            }
            common.warningMsg(warningMsg)
            currentBuild.description += "<br><b>${warningMsg}</b><br><br>"
        }

        // check Calico nodes' statuses
        def nodeStatusResults = salt.cmdRun(pepperEnv, target, "calicoctl node status")['return'][0]
        def nodesRunning = true
        def peersNotFound = []
        def peersNotOnline = []
        nodeStatusResults.each { k, v ->
            // println("Node:\n${k}\nResult:\n${v}")
            if (!v.contains("Calico process is running")) {
                nodesRunning = false
                def warningMsg = "Node ${k}: Calico node is not running."
                common.warningMsg(warningMsg)
                currentBuild.description += "<br><b>${warningMsg}</b><br><br>"
            }
            def nodePeersFound = false
            def nodePeersOnline = true
            for (nodeLine in v.split("\n")) {
                if (nodeLine.contains("|") && (!nodeLine.contains("STATE"))) {
                    def col = nodeLine.tokenize("|").collect{it.trim()}
                    if (col.size() == 5) {
                        nodePeersFound = true
                        if ((col[2] != "up") || (col[4] != "Established")) {
                            def warningMsg = "Node ${k}: BGP peer '${col[0]}' is out of reach. Peer state: '${col[2]}', connection info: '${col[4]}'."
                            common.warningMsg(warningMsg)
                            currentBuild.description += "<br><b>${warningMsg}</b><br><br>"
                            nodePeersOnline = false
                        }
                    }
                }
            }
            if (!nodePeersFound) {
                peersNotFound += k
            }
            if (!nodePeersOnline) {
                peersNotOnline += k
            }
        }
        if (nodesRunning) {
            common.infoMsg("All the Calico nodes are running")
        }
        if (peersNotFound) {
            def warningMsg = "BGP peers not found for the node(s): " + peersNotFound.join(', ') + "."
            common.warningMsg(warningMsg)
            currentBuild.description += "<br><b>${warningMsg}</b><br><br>"
        } else {
            common.infoMsg("BGP peers were found for all the nodes")
        }
        if (!peersNotOnline) {
            common.infoMsg("All reported BGP peers are reachable")
        }

        // check that 'calico-kube-controllers' is running
        // one CTL node will be used to get pod's state using kubectl
        def ctl_node = salt.getMinionsSorted(pepperEnv, CTL_TARGET)[0]
        def kubeCtrlResult = salt.cmdRun(
                pepperEnv, ctl_node, "kubectl get pod -n kube-system --selector=k8s-app=calico-kube-controllers"
            )['return'][0].values()[0].toString()
        if (kubeCtrlResult.contains("calico-kube-controllers")) {
            for (line in kubeCtrlResult.split("\n")) {
                if (line.contains("calico-kube-controllers")) {
                    col = line.tokenize(" ")
                    if ((col[1] != "1/1") || (col[2] != "Running")) {
                        def warningMsg = "Calico kube-controllers pod is not running properly."
                        common.warningMsg(warningMsg)
                        currentBuild.description += "<br><b>${warningMsg}</b><br><br>"
                    }
                    else {
                        common.infoMsg("Calico kube-controllers pod is running.")
                    }
                    break
                }
            }
        } else {
            def warningMsg = "Calico kube-controllers pod was not scheduled."
            common.warningMsg(warningMsg)
            currentBuild.description += "<br><b>${warningMsg}</b><br><br>"
        }
    }
}

def checkCalicoUpgradePossibility(pepperEnv, target) {
    def salt = new com.mirantis.mk.Salt()

    stage("Verification of Calico upgrade possibility") {
        // check Calico version
        def versionResult = salt.cmdRun(
                pepperEnv, target, "calicoctl version | grep 'Cluster Version'"
            )['return'][0].values()[0].split("\n")[0].trim()
        versionStr = (versionResult - "Cluster Version:").trim()
        version = versionStr.tokenize(".")
        if ((version.size() < 3) || (version[0] != "v2") || (version[1] != "6") || (version[2].toInteger() < 5)) {
            error(
                "Current Calico ${versionStr} cannot be upgraded to v3.x. " +
                "Calico v2.6.x starting from v2.6.5 can be upgraded. " +
                "For earlier versions, please update to v2.6.5 first."
            )
        }
        print("Calico version was determined: ${versionStr}")

        // check Calico is switched on
        def readinessResult = salt.cmdRun(
                pepperEnv, target, ". /var/lib/etcd/configenv && etcdctl get /calico/v1/Ready"
            )['return'][0].values()[0].split("\n")[0].trim()
        print("Calico readiness check result: ${readinessResult}")
        if (readinessResult != "true") {
            // try set it to true
            readinessResult = salt.cmdRun(
                pepperEnv, target, ". /var/lib/etcd/configenv && etcdctl set /calico/v1/Ready true"
            )['return'][0].values()[0].split("\n")[0].trim()
            print("Calico readiness result 2nd attempt: ${readinessResult}")
            if (readinessResult != "true") {
                error("Calico is not ready. '/calico/v1/Ready': '${readinessResult}'")
            }
        }

        // Calico data upgrade dry-run
        def cmd = "export APIV1_ETCD_ENDPOINTS=${ETCD_ENDPOINTS} && " +
                  "export APIV1_ETCD_CA_CERT_FILE=/var/lib/etcd/ca.pem && " +
                  "export APIV1_ETCD_CERT_FILE=/var/lib/etcd/etcd-client.crt && " +
                  "export APIV1_ETCD_KEY_FILE=/var/lib/etcd/etcd-client.key && " +
                  "export ETCD_ENDPOINTS=${ETCD_ENDPOINTS} && " +
                  "export ETCD_CA_CERT_FILE=/var/lib/etcd/ca.pem && " +
                  "export ETCD_CERT_FILE=/var/lib/etcd/etcd-client.crt && " +
                  "export ETCD_KEY_FILE=/var/lib/etcd/etcd-client.key && " +
                  "./calico-upgrade dry-run --ignore-v3-data"
        def dryRunResult = salt.cmdRun(pepperEnv, target, cmd)['return'][0].values()[0]
        // check dry-run result
        def validationSuccessStr = "Successfully validated v1 to v3 conversion"
        if (!dryRunResult.contains(validationSuccessStr)) {
            error("Calico data upgrade dry-run has failed")
        }
    }
}

def checkCalicoPolicySetting(pepperEnv, target) {
    def common = new com.mirantis.mk.Common()
    def salt = new com.mirantis.mk.Salt()

    stage("Checking of Calico network policy setting") {
        // check Calico policy enabled
        def cniPolicy = false
        def addonsPolicy = false
        def kubeCtrlRunning = false

        // check CNI config
        def cniCfgResult = salt.cmdRun(
                pepperEnv, target, "cat /etc/cni/net.d/10-calico.conf"
            )['return'][0].values()[0].toString()
        def cniCfg = new JsonSlurper().parseText(cniCfgResult)
        if (cniCfg.get("policy") != null) {
            if (cniCfg["policy"].get("type") == "k8s") {
                cniPolicy = true
            } else {
                common.warningMsg("Calico policy type is unknown or not set.")
            }
        }

        // check k8s addons
        def addonsResult = salt.cmdRun(
                pepperEnv, target, "ls /etc/kubernetes/addons"
            )['return'][0].values()[0].toString()
        if (addonsResult.contains("calico_policy")) {
            addonsPolicy = true
        }

        // check kube-controllers is running
        def kubeCtrlResult = salt.cmdRun(
                pepperEnv, target, "kubectl get pod -n kube-system --selector=k8s-app=calico-kube-controllers"
            )['return'][0].values()[0].toString()
        if (kubeCtrlResult.contains("Running")) {
            kubeCtrlRunning = true
        }

        // It's safe to enable Calico policy any time, but it may be unsafe to disable it.
        // So, no need to disable Calico policy for v3.x if it's not in use currently.
        // But if Calico policy is in use already, it should be enabled after upgrade as well.

        // check for consistency
        if ((cniPolicy != addonsPolicy) || (addonsPolicy != kubeCtrlRunning)) {
            caution = "ATTENTION. Calico policy setting cannot be determined reliably (enabled in CNI config: ${cniPolicy}, " +
                "presence in k8s addons: ${addonsPolicy}, kube-controllers is running: ${kubeCtrlRunning})."
            currentBuild.description += "<br><b>${caution}</b><br><br>"
            common.warningMsg(caution)
        } else {
            common.infoMsg("Current Calico policy state is detected as: ${cniPolicy}")
            if (cniPolicy) {
                // Calico policy is in use. Check policy setting for v3.x.
                common.infoMsg("Calico policy is in use. It should be enabled for v3.x as well.")
                def saltPolicyResult = salt.getPillar(
                        pepperEnv, target, "kubernetes:pool:network:calico:policy"
                    )["return"][0].values()[0].toString()

                common.infoMsg("kubernetes.pool.network.calico.policy: ${saltPolicyResult}")
                if (saltPolicyResult.toLowerCase().contains("true")) {
                    common.infoMsg("Calico policy setting for v3.x is detected as: true")
                } else {
                    caution = "ATTENTION. Currently, Calico is running with policy switched on. " +
                        "Calico policy setting for v3.x is not set to true. " +
                        "After upgrade is completed, Calico policy will be switched off. " +
                        "You will need to switch it on manually if required."
                    currentBuild.description += "<br><b>${caution}</b><br><br>"
                    common.warningMsg(caution)
                }
            }
        }

        if (addonsPolicy) {
            // Remove v2.6.x policy-related addons on masters to not interfere with v3.x kube-controllers
            salt.cmdRun(pepperEnv, CTL_TARGET, "rm -rf /etc/kubernetes/addons/calico_policy")
        }
    }
}

timeout(time: 12, unit: 'HOURS') {
    node() {
        try {

            stage("Setup virtualenv for Pepper") {
                python.setupPepperVirtualenv(pepperEnv, SALT_MASTER_URL, SALT_MASTER_CREDENTIALS)
            }

            if (CONFORMANCE_RUN_BEFORE.toBoolean()) {
                def target = CTL_TARGET
                def mcp_repo = ARTIFACTORY_URL
                def k8s_api = TEST_K8S_API_SERVER
                firstTarget = salt.getFirstMinion(pepperEnv, target)
                def containerd_enabled = containerDenabled(pepperEnv, firstTarget)
                def containerd_installed = containerDinstalled(pepperEnv, firstTarget)
                def conformance_pod_ready = conformancePodDefExists(pepperEnv, firstTarget)
                if (containerd_enabled && containerd_installed && conformance_pod_ready) {
                    def config = ['master': pepperEnv,
                                  'target': firstTarget,
                                  'junitResults': false,
                                  'autodetect': true]
                    test.executeConformance(config)
                } else {
                    executeConformance(pepperEnv, firstTarget, k8s_api, mcp_repo)
                }
            }

            if ((common.validInputParam('KUBERNETES_HYPERKUBE_IMAGE')) && (common.validInputParam('KUBERNETES_PAUSE_IMAGE'))) {
                overrideKubernetesImage(pepperEnv)
            }

            if ((common.validInputParam('KUBERNETES_CALICO_IMAGE'))
                && (common.validInputParam('KUBERNETES_CALICO_CALICOCTL_SOURCE'))
                && (common.validInputParam('KUBERNETES_CALICO_CALICOCTL_SOURCE_HASH'))
                && (common.validInputParam('KUBERNETES_CALICO_CNI_SOURCE'))
                && (common.validInputParam('KUBERNETES_CALICO_CNI_SOURCE_HASH'))
                && (common.validInputParam('KUBERNETES_CALICO_BIRDCL_SOURCE'))
                && (common.validInputParam('KUBERNETES_CALICO_BIRDCL_SOURCE_HASH'))
                && (common.validInputParam('KUBERNETES_CALICO_CNI_IPAM_SOURCE'))
                && (common.validInputParam('KUBERNETES_CALICO_CNI_IPAM_SOURCE_HASH'))
                && (common.validInputParam('KUBERNETES_CALICO_KUBE_CONTROLLERS_IMAGE'))
                ) {
                overrideCalicoImages(pepperEnv)
            }

            /*
                * Execute Calico upgrade if needed (only for v2 to v3 upgrade).
                * This part causes workloads operations downtime.
                * It is only required for Calico v2.x to v3.x upgrade when etcd is in use for Calico
                * as Calico etcd schema has different formats for Calico v2.x and Calico v3.x.
            */
            if (UPGRADE_CALICO_V2_TO_V3.toBoolean()) {
                // one CTL node will be used for running upgrade of Calico etcd schema
                def ctl_node = salt.getMinionsSorted(pepperEnv, CTL_TARGET)[0]

                // get ETCD_ENDPOINTS in use by Calico
                def ep_str = salt.cmdRun(pepperEnv, ctl_node, "cat /etc/calico/calicoctl.cfg | grep etcdEndpoints")['return'][0].values()[0]
                ETCD_ENDPOINTS = ep_str.split("\n")[0].tokenize(' ')[1]
                print("ETCD_ENDPOINTS in use by Calico: '${ETCD_ENDPOINTS}'")

                // download calico-upgrade utility
                downloadCalicoUpgrader(pepperEnv, ctl_node)

                // check the possibility of upgrading of Calico
                checkCalicoUpgradePossibility(pepperEnv, ctl_node)

                // check and adjust Calico policy setting
                checkCalicoPolicySetting(pepperEnv, ctl_node)

                // this sequence implies workloads operations downtime
                startCalicoUpgrade(pepperEnv, ctl_node)
                performCalicoConfigurationUpdateAndServicesRestart(pepperEnv, POOL, ctl_node)
                completeCalicoUpgrade(pepperEnv, ctl_node)
                // no downtime is expected after this point
            }

            /*
                * Execute k8s update
            */
            if (updates.contains("ctl")) {
                def target = CTL_TARGET

                if (PER_NODE.toBoolean()) {
                    def targetHosts = salt.getMinionsSorted(pepperEnv, target)

                    for (t in targetHosts) {
                        if (SIMPLE_UPGRADE.toBoolean()) {
                            performKubernetesControlUpdate(pepperEnv, t)
                        } else {
                            cordonNode(pepperEnv, t)
                            drainNode(pepperEnv, t)
                            regenerateCerts(pepperEnv, t)
                            performKubernetesControlUpdate(pepperEnv, t)
                            updateAddonManager(pepperEnv, t)
                            uncordonNode(pepperEnv, t)
                        }
                    }
                } else {
                    performKubernetesControlUpdate(pepperEnv, target)
                }
                if (!SIMPLE_UPGRADE.toBoolean()) {
                    // Addons upgrade should be performed after all nodes will be upgraded
                    updateAddons(pepperEnv, target)
                    // Wait for 90 sec for addons reconciling
                    sleep(90)
                }
            }

            if (updates.contains("cmp")) {
                def target = CMP_TARGET

                if (PER_NODE.toBoolean()) {
                    def targetHosts = salt.getMinionsSorted(pepperEnv, target)

                    for (t in targetHosts) {
                        if (SIMPLE_UPGRADE.toBoolean()) {
                            performKubernetesComputeUpdate(pepperEnv, t)
                        } else {
                            cordonNode(pepperEnv, t)
                            drainNode(pepperEnv, t)
                            regenerateCerts(pepperEnv, t)
                            performKubernetesComputeUpdate(pepperEnv, t)
                            uncordonNode(pepperEnv, t)
                        }
                    }
                } else {
                    performKubernetesComputeUpdate(pepperEnv, target)
                }
            }

            def ctl_node = salt.getMinionsSorted(pepperEnv, CTL_TARGET)[0]
            if (calicoEnabled(pepperEnv, ctl_node)) {
                checkCalicoClusterState(pepperEnv, POOL)
            }
            printVersionInfo(pepperEnv, ctl_node)

            if (CONFORMANCE_RUN_AFTER.toBoolean()) {
                def target = CTL_TARGET
                def mcp_repo = ARTIFACTORY_URL
                def k8s_api = TEST_K8S_API_SERVER
                firstTarget = salt.getFirstMinion(pepperEnv, target)
                def containerd_enabled = containerDenabled(pepperEnv, firstTarget)
                def containerd_installed = containerDinstalled(pepperEnv, firstTarget)
                def conformance_pod_ready = conformancePodDefExists(pepperEnv, firstTarget)
                if (containerd_enabled && containerd_installed && conformance_pod_ready) {
                    def config = ['master': pepperEnv,
                                  'target': firstTarget,
                                  'junitResults': false,
                                  'autodetect': true]
                    test.executeConformance(config)
                } else {
                    executeConformance(pepperEnv, firstTarget, k8s_api, mcp_repo)
                }
            }
        } catch (Throwable e) {
            // If there was an error or exception thrown, the build failed
            currentBuild.result = "FAILURE"
            currentBuild.description = currentBuild.description ? e.message + " " + currentBuild.description : e.message
            throw e
        }
    }
}