tests/functional/K8S_SystemTest.robot

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*** Settings ***
Documentation     Provide the function to scale up/down the etcd cluster
Library           OperatingSystem

*** Variables ***
${timeout}        60s
${desired_etcd_cluster_size}        3
${minimal_etcd_cluster_size}        2
${namespace}        voltha
${etcd__resources}        etcdclusters.etcd.database.coreos.com
${etcd_name}       voltha-etcd-cluster

*** Test Cases ***
Scale Down etcd Cluster
    [Documentation]    Scale Down the etcd cluster to minimal size, skip test if current cluster size < 3
    [Tags]    scaledown    etcddown
    ${current_size}=   Get etcd Running Size    voltha
    Pass Execution If    '${current_size}' != '${desired_etcd_cluster_size}'
    ...    'Skip the test if the cluster size smaller than minimal size 3'
    # The minimal cluster size after scale down
    # based on https://github.com/etcd-io/etcd/blob/master/Documentation/faq.md#what-is-failure-tolerance
    Scale etcd    ${namespace}    ${minimal_etcd_cluster_size}
    Wait Until Keyword Succeeds    ${timeout}    2s    Validate etcd Size   ${namespace}    ${minimal_etcd_cluster_size}

Scale Up etcd Cluster
    [Documentation]    Recover the etcd cluster by scaling up its size
    [Tags]    scaleup    etcdup
    ${current_size}=   Get etcd Running Size    voltha
    Pass Execution If    '${current_size}' != '${minimal_etcd_cluster_size}'
    ...    'Skip the test if the cluster size smaller than minimal size 3'
    Scale etcd    ${namespace}    ${desired_etcd_cluster_size}
    # We scale up the size to 3, the recommended size of etcd cluster.
    Wait Until Keyword Succeeds    ${timeout}    2s    Validate etcd Size   ${namespace}    ${desired_etcd_cluster_size}

*** Keywords ***
Get etcd Running Size
    [Arguments]    ${namespace}
    [Documentation]    Get the number of running etcd nodes
    ${rc}    ${size}=    Run and Return Rc and Output
    ...    kubectl -n ${namespace} get ${etcd__resources} ${etcd_name} -o jsonpath='{.status.size}'
    Should Be Equal As Integers    ${rc}    0
    [Return]    ${size}

Scale etcd
    [Arguments]    ${namespace}    ${size}
    [Documentation]    Scale down the number of etcd pod
    ${rc}=    Run and Return Rc
    ...    kubectl -n ${namespace} patch ${etcd__resources} ${etcd_name} --type='merge' -p '{"spec":{"size":${size}}}'
    Should Be Equal As Integers    ${rc}    0

Validate etcd Size
    [Arguments]    ${namespace}    ${etcd_cluster_size}
    [Documentation]    Scale down the number of etcd pod
    ${rc}    ${size}=    Run and Return Rc and Output
    ...    kubectl -n ${namespace} get ${etcd__resources} ${etcd_name} -o jsonpath='{.status.size}'
    Should Be Equal As Integers    ${size}    ${etcd_cluster_size}