在步驟函數中執行逐步部署狀態機器版本

滾動式部署是一種部署策略，會慢慢地以新版應用程式取代舊版應用程式。若要執行狀態機器版本的滾動式部署，請逐步傳送越來越多的執行流量到新版本。流量量和增加速率是您設定的參數。

您可以使用下列其中一個選項來執行版本的滾動式部署：

Step Functions 主控台 — 建立指向相同狀態機器的兩個版本的別名。對於此別名，您可以設定路由組態以在兩個版本之間轉移流量。如需有關使用主控台推出版本的詳細資訊，請參閱版本和Aliases。
腳本 AWS CLI 和 SDK — 使用建立殼層指令碼 AWS CLI 或 AWS SDK。如需詳細資訊，請參閱下列使用章節 AWS CLI 以及 AWS SDK.
AWS CloudFormation 範本 — 使用AWS::StepFunctions::StateMachineVersion和AWS::StepFunctions::StateMachineAlias資源發佈多個狀態機器版本，並建立別名以指向其中一個或兩個版本。

本節中的範例指令碼顯示如何使用 AWS CLI 逐漸將流量從以前的狀態機版本轉移到新的狀態機版本。您可以使用此示例腳本，也可以根據需要更新它。

此指令碼顯示 Canary 部署，用於使用別名部署新狀態機版本。下列步驟概述指令碼執行的工作：

如果publish_revision參數設定為 true，請將最新版本發佈revision為狀態機器的下一個版本。如果部署成功，此版本將成為新的即時版本。

如果將publish_revision參數設定為 false，則指令碼會部署狀態機器的上次發佈版本。
如果別名尚不存在，請建立別名。如果別名不存在，請將此別名的 100% 流量指向新版本，然後結束指令碼。
更新別名的路由配置，以將一小部分流量從舊版轉移到新版本。您可以使用canary_percentage參數設定此初期測試百分比。
默認情況下，每 60 秒監視一次可配置的 CloudWatch 警報。如果其中任何警示發出，請將 100% 的流量指向舊版，立即復原部署。

在中定義的每個時間間隔 (以秒為單位) 之後alarm_polling_interval，繼續監視警報。繼續監視，直到中定義的時間間隔canary_interval_seconds已過。
如果期間未發出警報canary_interval_seconds，請將 100% 的流量轉移到新版本。
如果新版本部署成功，請刪除任何早於參數中指定history_max數目的版本。


#!/bin/bash
# 
# AWS StepFunctions example showing how to create a canary deployment with a
# State Machine Alias and versions.
# 
# Requirements: AWS CLI installed and credentials configured.
# 
# A canary deployment deploys the new version alongside the old version, while
# routing only a small fraction of the overall traffic to the new version to
# see if there are any errors. Only once the new version has cleared a testing
# period will it start receiving 100% of traffic.
# 
# For a Blue/Green or All at Once style deployment, you can set the
# canary_percentage to 100. The script will immediately shift 100% of traffic
# to the new version, but keep on monitoring the alarms (if any) during the
# canary_interval_seconds time interval. If any alarms raise during this period,
# the script will automatically rollback to the previous version.
# 
# Step Functions allows you to keep a maximum of 1000 versions in version history
# for a state machine. This script has a version history deletion mechanism at
# the end, where it will delete any versions older than the limit specified.
# 
# For an example that also demonstrates linear (or rolling) deployments, see the following: 
# https://github.com/aws-samples/aws-stepfunctions-examples/blob/main/gradual-deploy/sfndeploy.py

set -euo pipefail

# ******************************************************************************
# you can safely change the variables in this block to your values
state_machine_name="my-state-machine"
alias_name="alias-1"
region="us-east-1"

# array of cloudwatch alarms to poll during the test period.
# to disable alarm checking, set alarm_names=()
alarm_names=("alarm1" "alarm name with a space")

# true to publish the current revision as the next version before deploy.
# false to deploy the latest version from the state machine's version history.
publish_revision=true

# true to force routing configuration update even if the current routing
# for the alias does not have a 100% routing config.
# false will abandon deploy attempt if current routing config not 100% to a
# single version.
# Be careful when you combine this flag with publish_revision - if you just
# rerun the script you might deploy the newly published revision from the
# previous run.
force=false

# percentage of traffic to route to the new version during the test period
canary_percentage=10

# how many seconds the canary deployment lasts before full deploy to 100%
canary_interval_seconds=300

# how often to poll the alarms
alarm_polling_interval=60

# how many versions to keep in history. delete versions prior to this.
# set to 0 to disable old version history deletion.
history_max=0
# ******************************************************************************

#######################################
# Update alias routing configuration.
# 
# If you don't specify version 2 details, will only create 1 routing entry. In
# this case the routing entry weight must be 100.
# 
# Globals:
#   alias_arn
# Arguments:
#   1. version 1 arn
#   2. version 1 weight
#   3. version 2 arn (optional)
#   4. version 2 weight (optional)
#######################################
function update_routing() {
  if [[ $# -eq 2 ]]; then
    local routing_config="[{\"stateMachineVersionArn\": \"$1\", \"weight\":$2}]"
  elif [[ $# -eq 4 ]]; then
    local routing_config="[{\"stateMachineVersionArn\": \"$1\", \"weight\":$2}, {\"stateMachineVersionArn\": \"$3\", \"weight\":$4}]"
  else
    echo "You have to call update_routing with either 2 or 4 input arguments." >&2
    exit 1
  fi
  
  ${aws} update-state-machine-alias --state-machine-alias-arn ${alias_arn} --routing-configuration "${routing_config}"
}

# ******************************************************************************
# pre-run validation
if [[ (("${#alarm_names[@]}" -gt 0)) ]]; then
  alarm_exists_count=$(aws cloudwatch describe-alarms --alarm-names "${alarm_names[@]}" --alarm-types "CompositeAlarm" "MetricAlarm" --query "length([MetricAlarms, CompositeAlarms][])" --output text)

  if [[ (("${#alarm_names[@]}" -ne "${alarm_exists_count}")) ]]; then
    echo All of the alarms to monitor do not exist in CloudWatch: $(IFS=,; echo "${alarm_names[*]}") >&2
    echo Only the following alarm names exist in CloudWatch:
    aws cloudwatch describe-alarms --alarm-names "${alarm_names[@]}" --alarm-types "CompositeAlarm" "MetricAlarm" --query "join(', ', [MetricAlarms, CompositeAlarms][].AlarmName)" --output text
    exit 1
  fi
fi

if [[ (("${history_max}" -gt 0)) && (("${history_max}" -lt 2)) ]]; then
  echo The minimum value for history_max is 2. This is the minimum number of older state machine versions to be able to rollback in the future. >&2
  exit 1
fi
# ******************************************************************************
# main block follows

account_id=$(aws sts get-caller-identity --query Account --output text)

sm_arn="arn:aws:states:${region}:${account_id}:stateMachine:${state_machine_name}"

# the aws command we'll be invoking a lot throughout.
aws="aws stepfunctions"

# promote the latest revision to the next version
if [[ "${publish_revision}" = true ]]; then
  new_version=$(${aws} publish-state-machine-version --state-machine-arn=$sm_arn --query stateMachineVersionArn --output text)
  echo Published the current revision of state machine as the next version with arn: ${new_version}
else
  new_version=$(${aws} list-state-machine-versions --state-machine-arn ${sm_arn} --max-results 1 --query "stateMachineVersions[0].stateMachineVersionArn" --output text)
  echo "Since publish_revision is false, using the latest version from the state machine's version history: ${new_version}"
fi

# find the alias if it exists
alias_arn_expected="${sm_arn}:${alias_name}"
alias_arn=$(${aws} list-state-machine-aliases --state-machine-arn ${sm_arn} --query "stateMachineAliases[?stateMachineAliasArn==\`${alias_arn_expected}\`].stateMachineAliasArn" --output text)

if [[ "${alias_arn_expected}" == "${alias_arn}" ]]; then
  echo Found alias ${alias_arn}

  echo Current routing configuration is:
  ${aws} describe-state-machine-alias --state-machine-alias-arn "${alias_arn}" --query routingConfiguration
else
  echo Alias does not exist. Creating alias ${alias_arn_expected} and routing 100% traffic to new version ${new_version}
  
  ${aws} create-state-machine-alias --name "${alias_name}" --routing-configuration "[{\"stateMachineVersionArn\": \"${new_version}\", \"weight\":100}]"

  echo Done!
  exit 0
fi

# find the version to which the alias currently points (the current live version)
old_version=$(${aws} describe-state-machine-alias --state-machine-alias-arn $alias_arn --query "routingConfiguration[?weight==\`100\`].stateMachineVersionArn" --output text)

if [[ -z "${old_version}" ]]; then
  if [[ "${force}" = true ]]; then
    echo Force setting is true. Will force update to routing config for alias to point 100% to new version.
    update_routing "${new_version}" 100
    
    echo Alias ${alias_arn} now pointing 100% to ${new_version}.
    echo Done!
    exit 0
  else
    echo Alias ${alias_arn} does not have a routing config entry with 100% of the traffic. This means there might be a deploy in progress, so not starting another deploy at this time. >&2
    exit 1
  fi
fi

if [[ "${old_version}" == "${new_version}" ]]; then
  echo The alias already points to this version. No update necessary.
  exit 0
fi

echo Switching ${canary_percentage}% to new version ${new_version}
(( old_weight = 100 - ${canary_percentage} ))
update_routing "${new_version}" ${canary_percentage} "${old_version}" ${old_weight}

echo New version receiving ${canary_percentage}% of traffic.
echo Old version ${old_version} is still receiving ${old_weight}%.

if [[ ${#alarm_names[@]} -eq 0 ]]; then
  echo No alarm_names set. Skipping cloudwatch monitoring.
  echo Will sleep for ${canary_interval_seconds} seconds before routing 100% to new version.
  sleep ${canary_interval_seconds}
  echo Canary period complete. Switching 100% of traffic to new version...
else
  echo Checking if alarms fire for the next ${canary_interval_seconds} seconds.

  (( total_wait = canary_interval_seconds + $(date +%s) ))

  now=$(date +%s)
  while [[ ((${now} -lt ${total_wait})) ]]; do
    alarm_result=$(aws cloudwatch describe-alarms --alarm-names "${alarm_names[@]}" --state-value ALARM --alarm-types "CompositeAlarm" "MetricAlarm" --query "join(', ', [MetricAlarms, CompositeAlarms][].AlarmName)" --output text)

    if [[ ! -z "${alarm_result}" ]]; then
      echo The following alarms are in ALARM state: ${alarm_result}. Rolling back deploy. >&2
      update_routing "${old_version}" 100

      echo Rolled back to ${old_version}
      exit 1
    fi
  
    echo Monitoring alarms...no alarms have triggered.
    sleep ${alarm_polling_interval}
    now=$(date +%s)
  done

  echo No alarms detected during canary period. Switching 100% of traffic to new version...
fi

update_routing "${new_version}" 100

echo Version ${new_version} is now receiving 100% of traffic.

if [[ (("${history_max}" -eq 0 ))]]; then
  echo Version History deletion is disabled. Remember to prune your history, the default limit is 1000 versions.
  echo Done!
  exit 0
fi

echo Keep the last ${history_max} versions. Deleting any versions older than that...

# the results are sorted in descending order of the version creation time
version_history=$(${aws} list-state-machine-versions --state-machine-arn ${sm_arn} --max-results 1000 --query "join(\`\"\\n\"\`, stateMachineVersions[].stateMachineVersionArn)" --output text)

counter=0

while read line; do
  ((counter=${counter} + 1))

  if [[ (( ${counter} -gt ${history_max})) ]]; then
    echo Deleting old version ${line}
    ${aws} delete-state-machine-version --state-machine-version-arn ${line}
  fi
done <<< "${version_history}"

echo Done!

的範例指令碼aws-stepfunctions-examples顯示如何使用 AWS SDK使 Python 逐漸將流量從以前版本轉移到新版本的狀態機。您可以使用此示例腳本，也可以根據需要更新它。

此指令碼會顯示下列部署策略：

金絲雀 — 以兩種增量轉移流量。

在第一個增量中，一小部分流量 (例如，10%) 會轉移到新版本。在第二個增量中，在以秒為單位的指定時間間隔結束之前，剩餘的流量會轉移到新版本。只有在指定的時間間隔內沒有關閉 CloudWatch 警報時，才會切換到新版本的剩餘流量。
線性或滾動 — 以相等的增量將流量轉移到新版本，每個增量之間的秒數相等。

例如，如果您將增量百分比指定為20600秒--interval數，則此部署會每 600 秒增加 20% 的流量，直到新版本收到 100% 的流量為止。

如果發生任何 CloudWatch 警示，此部署會立即復原新版本。
一@@ 次全部或藍色/綠色 — 立即將 100% 的流量轉移到新版本。此部署會監控新版本，如果有任何 CloudWatch 警示，則會自動將其復原至先前的版本。

下列範本 CloudFormation 範例會發佈名為的狀態機器的兩個版本MyStateMachine。它創建一個名為的別名PROD，它指向這兩個版本，然後部署該版2本。

在此範例中，10% 的流量會2每五分鐘轉移至版本，直到此版本收到 100% 的流量為止。這個例子還顯示了如何設置 CloudWatch 警報。如果您設定的任何警示進入ALARM狀態，部署會失敗並立即復原。


MyStateMachine:
  Type: AWS::StepFunctions::StateMachine
  Properties:
    Type: STANDARD
    StateMachineName: MyStateMachine
    RoleArn: arn:aws:iam::123456789012:role/myIamRole
    Definition:
      StartAt: PassState
      States:
        PassState:
          Type: Pass
          Result: Result
          End: true

MyStateMachineVersionA:
  Type: AWS::StepFunctions::StateMachineVersion
  Properties:
    Description: Version 1
    StateMachineArn: !Ref MyStateMachine

MyStateMachineVersionB:
  Type: AWS::StepFunctions::StateMachineVersion
  Properties:
    Description: Version 2
    StateMachineArn: !Ref MyStateMachine

PROD:
  Type: AWS::StepFunctions::StateMachineAlias
  Properties:
    Name: PROD
    Description: The PROD state machine alias taking production traffic.
    DeploymentPreference:
      StateMachineVersionArn: !Ref MyStateMachineVersionB
      Type: LINEAR
      Percentage: 10
      Interval: 5
      Alarms:
        # A list of alarms that you want to monitor. If any of these alarms trigger, rollback the deployment immediately by pointing 100 percent of traffic to the previous version.
        - !Ref CloudWatchAlarm1
        - !Ref CloudWatchAlarm2

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