Read-only #209
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| name: Read-only | |
| # Prepare for Delius down-time by entering "read-only" mode. | |
| # Switches off message consumers, blocks any write APIs, and re-points everything else at the snapshot standby database. | |
| # Note: In the test environment, where there is no snapshot standby database, the services are stopped completely. | |
| on: | |
| workflow_call: | |
| inputs: | |
| environment: | |
| description: Environment | |
| required: true | |
| type: string | |
| action: | |
| description: Enable or disable read-only mode? | |
| required: true | |
| type: string | |
| workflow_dispatch: | |
| inputs: | |
| environment: | |
| description: Environment | |
| default: prod | |
| required: true | |
| type: choice | |
| options: | |
| - test | |
| - preprod | |
| - prod | |
| action: | |
| description: Enable or disable read-only mode? | |
| default: enable | |
| required: true | |
| type: choice | |
| options: | |
| - enable | |
| - disable | |
| jobs: | |
| unblock-pipeline: | |
| name: Unblock deployment pipeline | |
| runs-on: ubuntu-latest | |
| steps: | |
| - if: inputs.environment != 'prod' && inputs.action == 'disable' | |
| uses: actions/create-github-app-token@v1 | |
| id: app-token | |
| with: | |
| app-id: ${{ secrets.BOT_APP_ID }} | |
| private-key: ${{ secrets.BOT_APP_PRIVATE_KEY }} | |
| - if: inputs.environment != 'prod' && inputs.action == 'disable' | |
| run: jq -n "$reviewers" | gh api -XPUT '/repos/ministryofjustice/hmpps-probation-integration-services/environments/${{ inputs.environment }}' --input - | |
| env: | |
| reviewers: '{"reviewers":[]}' | |
| GH_TOKEN: ${{ steps.app-token.outputs.token }} | |
| get-projects: | |
| name: Get projects | |
| runs-on: ubuntu-latest | |
| environment: ${{ inputs.environment }} | |
| needs: unblock-pipeline | |
| outputs: | |
| projects: ${{ steps.kubectl.outputs.projects }} | |
| steps: | |
| - uses: actions/checkout@v4 | |
| - uses: ./.github/actions/cloud-platform-auth | |
| with: | |
| api: ${{ secrets.KUBE_ENV_API }} | |
| cert: ${{ secrets.KUBE_CERT }} | |
| cluster: ${{ secrets.KUBE_CLUSTER }} | |
| namespace: ${{ secrets.KUBE_NAMESPACE }} | |
| token: ${{ secrets.KUBE_TOKEN }} | |
| - id: kubectl | |
| run: | | |
| json=$( | |
| kubectl get deployments -o jsonpath='{.items[*].metadata.name}' | xargs -n1 \ | |
| | grep -v domain-events-and-delius \ | |
| | grep -v offender-events-and-delius \ | |
| | jq --raw-input . | jq --slurp --compact-output . | |
| ) | |
| echo "projects=$json" | tee -a "$GITHUB_OUTPUT" | |
| # Event publishers always require write access to the DB, so stop them while in read-only mode | |
| event-publishers: | |
| name: ${{ inputs.action == 'enable' && 'Stop' || 'Start' }} event publishers | |
| runs-on: ubuntu-latest | |
| environment: ${{ inputs.environment }} | |
| needs: get-projects | |
| steps: | |
| - uses: actions/checkout@v4 | |
| - uses: ./.github/actions/cloud-platform-auth | |
| with: | |
| api: ${{ secrets.KUBE_ENV_API }} | |
| cert: ${{ secrets.KUBE_CERT }} | |
| cluster: ${{ secrets.KUBE_CLUSTER }} | |
| namespace: ${{ secrets.KUBE_NAMESPACE }} | |
| token: ${{ secrets.KUBE_TOKEN }} | |
| - run: | | |
| kubectl scale deploy domain-events-and-delius --replicas "$replicas" | |
| kubectl scale deploy offender-events-and-delius --replicas "$replicas" | |
| env: | |
| replicas: ${{ inputs.action == 'enable' && '0' || '1' }} | |
| # There is no standby database in the test environment, so stop all deployments (except auth) | |
| stop-start: | |
| if: inputs.environment == 'test' | |
| runs-on: ubuntu-latest | |
| environment: ${{ inputs.environment }} | |
| needs: get-projects | |
| strategy: | |
| matrix: | |
| project: ${{ fromJson(needs.get-projects.outputs.projects) }} | |
| steps: | |
| - uses: actions/checkout@v4 | |
| - uses: ./.github/actions/cloud-platform-auth | |
| with: | |
| api: ${{ secrets.KUBE_ENV_API }} | |
| cert: ${{ secrets.KUBE_CERT }} | |
| cluster: ${{ secrets.KUBE_CLUSTER }} | |
| namespace: ${{ secrets.KUBE_NAMESPACE }} | |
| token: ${{ secrets.KUBE_TOKEN }} | |
| - name: ${{ inputs.action == 'enable' && 'Stop' || 'Start' }} deployments | |
| run: kubectl scale deploy '${{ matrix.project }}' --replicas "${{ inputs.action == 'enable' && '0' || '2' }}" | |
| - name: ${{ inputs.action == 'enable' && 'Block' || 'Unblock' }} ingresses | |
| uses: nick-fields/retry@7152eba30c6575329ac0576536151aca5a72780e # v3.0.0 | |
| with: | |
| max_attempts: 3 # Patching ingresses intermittently fails on MOJ Cloud Platform, so we retry this step | |
| timeout_minutes: 15 | |
| command: | | |
| ingress=$(kubectl get ingress -o jsonpath='{.items[*].metadata.name}' -l 'app=${{ matrix.project }}') | |
| kubectl annotate ingress "$ingress" 'nginx.ingress.kubernetes.io/configuration-snippet=${{ inputs.action == 'enable' && 'limit_except GET { deny all; }' || '' }}' --overwrite | |
| # Block updates at the ingress and switch to the standby database for read operations | |
| switch-database: | |
| if: inputs.environment != 'test' | |
| runs-on: ubuntu-latest | |
| environment: ${{ inputs.environment }} | |
| needs: get-projects | |
| strategy: | |
| matrix: | |
| project: ${{ fromJson(needs.get-projects.outputs.projects) }} | |
| steps: | |
| - uses: actions/checkout@v4 | |
| - uses: ./.github/actions/cloud-platform-auth | |
| with: | |
| api: ${{ secrets.KUBE_ENV_API }} | |
| cert: ${{ secrets.KUBE_CERT }} | |
| cluster: ${{ secrets.KUBE_CLUSTER }} | |
| namespace: ${{ secrets.KUBE_NAMESPACE }} | |
| token: ${{ secrets.KUBE_TOKEN }} | |
| - name: Block updates | |
| if: inputs.action == 'enable' && matrix.project != 'hmpps-auth-and-delius' && matrix.project != 'probation-search-and-delius' && matrix.project != 'feature-flags' # Note: hmpps-auth is excluded here to continue allowing 'POST /authenticate' requests, which are read-only | |
| uses: nick-fields/retry@7152eba30c6575329ac0576536151aca5a72780e # v3.0.0 | |
| with: | |
| max_attempts: 3 # Patching ingresses intermittently fails on MOJ Cloud Platform, so we retry this step | |
| timeout_minutes: 15 | |
| command: | | |
| ingress=$(kubectl get ingress -o jsonpath='{.items[*].metadata.name}' -l 'app=${{ matrix.project }}') | |
| kubectl annotate ingress "$ingress" 'nginx.ingress.kubernetes.io/configuration-snippet=limit_except GET { deny all; }' --overwrite | |
| - name: Switch to ${{ inputs.action == 'enable' && 'standby' || 'primary' }} database | |
| env: | |
| MESSAGING_CONSUMER_ENABLED: ${{ inputs.action == 'enable' && 'false' || 'true' }} | |
| SPRING_DATASOURCE_URL: ${{ inputs.action == 'enable' && 'DB_STANDBY_URL' || 'DB_URL' }} | |
| run: | | |
| kubectl get deployment "${{ matrix.project }}" -o json \ | |
| | jq --arg name MESSAGING_CONSUMER_ENABLED --arg value "$MESSAGING_CONSUMER_ENABLED" \ | |
| '.spec.template.spec.containers[0].env |= if any(.[]; .name == $name) then map(if .name == $name then . + {"value":$value} else . end) else . + [{"name":$name,"value":$value}] end' \ | |
| | jq --arg name SPRING_DATASOURCE_URL --arg value "$SPRING_DATASOURCE_URL" \ | |
| '.spec.template.spec.containers[0].env |= map(if .name == $name then .valueFrom.secretKeyRef.key = $value else . end)' \ | |
| | kubectl apply -f - | |
| - name: Unblock updates | |
| if: inputs.action == 'disable' && matrix.project != 'hmpps-auth-and-delius' && matrix.project != 'probation-search-and-delius' && matrix.project != 'feature-flags' | |
| uses: nick-fields/retry@7152eba30c6575329ac0576536151aca5a72780e # v3.0.0 | |
| with: | |
| max_attempts: 3 # Patching ingresses intermittently fails on MOJ Cloud Platform, so we retry this step | |
| timeout_minutes: 15 | |
| command: | | |
| ingress=$(kubectl get ingress -o jsonpath='{.items[*].metadata.name}' -l 'app=${{ matrix.project }}') | |
| kubectl annotate ingress "$ingress" 'nginx.ingress.kubernetes.io/configuration-snippet=' --overwrite | |
| block-pipeline: | |
| name: Block deployment pipeline | |
| needs: | |
| - event-publishers | |
| - stop-start | |
| - switch-database | |
| if: always() && !failure() && !cancelled() | |
| runs-on: ubuntu-latest | |
| steps: | |
| - if: inputs.environment != 'prod' && inputs.action == 'enable' | |
| uses: actions/create-github-app-token@v1 | |
| id: app-token | |
| with: | |
| app-id: ${{ secrets.BOT_APP_ID }} | |
| private-key: ${{ secrets.BOT_APP_PRIVATE_KEY }} | |
| - if: inputs.environment != 'prod' && inputs.action == 'enable' | |
| run: jq -n "$reviewers" | gh api -XPUT '/repos/ministryofjustice/hmpps-probation-integration-services/environments/${{ inputs.environment }}' --input - | |
| env: | |
| reviewers: '{"reviewers":[{"type":"Team","id":5521382}]}' | |
| GH_TOKEN: ${{ steps.app-token.outputs.token }} | |
| notify: | |
| if: always() && !cancelled() | |
| runs-on: ubuntu-latest | |
| needs: | |
| - event-publishers | |
| - stop-start | |
| - switch-database | |
| - block-pipeline | |
| steps: | |
| - name: Send message to Slack | |
| uses: slackapi/slack-github-action@485a9d42d3a73031f12ec201c457e2162c45d02d # v2.0.0 | |
| if: ${{ !contains(needs.*.result, 'failure') }} | |
| with: | |
| method: chat.postMessage | |
| token: ${{ secrets.SLACK_BOT_TOKEN }} | |
| payload: | | |
| { | |
| "channel": "probation-integration-notifications", | |
| "text": "Read-only mode alert", | |
| "blocks": [ | |
| { | |
| "type": "header", | |
| "text": { | |
| "type": "plain_text", | |
| "text": "${{ inputs.action == 'enable' && (inputs.environment == 'test' && '🔴 Offline' || '🚫 Read-only') || '🟢 Online' }}" | |
| } | |
| }, | |
| { | |
| "type": "context", | |
| "elements": [ | |
| { | |
| "type": "mrkdwn", | |
| "text": "The *${{ inputs.environment }}* integration services ${{ inputs.action == 'enable' && (inputs.environment == 'test' && 'have been switched off for a Delius deployment' || 'are in read-only mode') || 'are back online' }}." | |
| } | |
| ] | |
| }, | |
| { | |
| "type": "actions", | |
| "elements": [ | |
| { | |
| "type": "button", | |
| "text": { | |
| "type": "plain_text", | |
| "text": "↩️ Switch back" | |
| }, | |
| "url": "${{ github.server_url }}/${{ github.repository }}/actions/workflows/readonly.yml" | |
| }, | |
| { | |
| "type": "button", | |
| "text": { | |
| "type": "plain_text", | |
| "text": "📝 Logs" | |
| }, | |
| "url": "${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}" | |
| } | |
| ] | |
| } | |
| ] | |
| } | |
| - name: Send failure message to Slack | |
| uses: slackapi/slack-github-action@485a9d42d3a73031f12ec201c457e2162c45d02d # v2.0.0 | |
| if: ${{ contains(needs.*.result, 'failure') }} | |
| with: | |
| method: chat.postMessage | |
| token: ${{ secrets.SLACK_BOT_TOKEN }} | |
| payload: | | |
| { | |
| "channel": "probation-integration-notifications", | |
| "text": "Read-only mode failure", | |
| "blocks": [ | |
| { | |
| "type": "header", | |
| "text": { | |
| "type": "plain_text", | |
| "text": "❌ Failed to ${{ inputs.action }} read-only mode" | |
| } | |
| }, | |
| { | |
| "type": "context", | |
| "elements": [ | |
| { | |
| "type": "mrkdwn", | |
| "text": "The *${{ inputs.environment }}* integration services may be in the wrong state. Please check the logs and re-run the workflow." | |
| } | |
| ] | |
| }, | |
| { | |
| "type": "actions", | |
| "elements": [ | |
| { | |
| "type": "button", | |
| "text": { | |
| "type": "plain_text", | |
| "text": "📝 Logs" | |
| }, | |
| "url": "${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}" | |
| } | |
| ] | |
| } | |
| ] | |
| } | |