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import type { DeploymentSettings } from '../model/DeploymentSettings'
import { defaults } from '../DefaultSettings'
import {
CloudFrontClient,
CreateInvalidationCommand,
CreateInvalidationCommandInput,
GetDistributionConfigCommand,
GetDistributionConfigCommandOutput,
UpdateDistributionCommand,
UpdateDistributionCommandInput,
} from '@aws-sdk/client-cloudfront'
import {
GetFunctionCommand,
FunctionConfiguration,
LambdaClient,
ListVersionsByFunctionCommand,
UpdateFunctionCodeCommand,
UpdateFunctionCodeCommandOutput,
} from '@aws-sdk/client-lambda'
import { ApiException, ErrorCode } from '../exceptions'
import { delay } from '../utils/delay'
import {
doesCacheBehaviorUseOrigins,
getCacheBehaviorLambdaFunctionAssociations,
getFPCDNOrigins,
} from '../utils/cloudfrontUtils'
const CLOUDFRONT_CONFIG_UPDATE_ATTEMPT_COUNT = 5
const CLOUDFRONT_CONFIG_UPDATE_ATTEMPT_DELAY = 3000 // Milliseconds
/**
* @throws {ApiException}
* @throws {import("@aws-sdk/client-lambda").LambdaServiceException}
*/
export async function handleUpdate(
lambdaClient: LambdaClient,
cloudFrontClient: CloudFrontClient,
settings: DeploymentSettings
): Promise<APIGatewayProxyResult> {
console.info(`Going to upgrade Fingerprint Pro function association at CloudFront distribution.`)
console.info(`Settings: ${JSON.stringify(settings)}`)
const functionInformationBeforeUpdate = await getLambdaFunctionInformation(lambdaClient, settings.LambdaFunctionName)
if (!functionInformationBeforeUpdate?.FunctionArn) {
throw new ApiException(ErrorCode.LambdaFunctionNotFound)
}
const currentRevisionId = functionInformationBeforeUpdate?.RevisionId
Iif (!currentRevisionId) {
console.error('Lambda@Edge function expected to have a revision ID of the current deployment')
throw new ApiException(ErrorCode.LambdaFunctionCurrentRevisionNotDefined)
}
const currentCodeSha256 = functionInformationBeforeUpdate.CodeSha256
const newVersionConfiguration = await updateLambdaFunctionCode(
lambdaClient,
settings.LambdaFunctionName,
currentRevisionId
)
const newRevisionId = newVersionConfiguration.RevisionId
if (!newRevisionId) {
console.error('New revision for Lambda@Edge function was not created')
throw new ApiException(ErrorCode.LambdaFunctionUpdateRevisionNotCreated)
}
const functionArn = newVersionConfiguration.FunctionArn
Iif (!functionArn) {
console.error('Function ARN for new version is not defined')
throw new ApiException(ErrorCode.LambdaFunctionARNNotFound)
}
const listVersionsAfterUpdate = await listLambdaFunctionVersions(lambdaClient, settings.LambdaFunctionName)
const newVersions = listVersionsAfterUpdate.filter((conf) => conf?.RevisionId === newRevisionId)
if (newVersions.length !== 1) {
console.error(`Excepted one new version, but found: ${newVersions.length} versions`)
throw new ApiException(ErrorCode.LambdaFunctionWrongNewVersionsCount)
}
const newVersion = newVersions[0]
const newVersionCodeSha256 = newVersion.CodeSha256
if (currentCodeSha256 === newVersionCodeSha256) {
console.info(`New version's code SHA256 is equal to the previous $LATEST code SHA256`)
return {
statusCode: 200,
body: JSON.stringify({ status: 'Update is not required' }),
headers: {
'content-type': 'application/json',
},
}
} else {
console.info(
`New version's SHA256 is not equals to the previous one. Continue with updating CloudFront resources...`
)
}
await updateCloudFrontConfig(cloudFrontClient, settings.CFDistributionId, settings.LambdaFunctionName, functionArn)
return {
statusCode: 200,
body: JSON.stringify({ status: 'Update completed' }),
headers: {
'content-type': 'application/json',
},
}
}
/**
* @throws {ApiException}
*/
async function updateCloudFrontConfig(
cloudFrontClient: CloudFrontClient,
cloudFrontDistributionId: string,
lambdaFunctionName: string,
latestFunctionArn: string
) {
const configParams = {
Id: cloudFrontDistributionId,
}
const getConfigCommand = new GetDistributionConfigCommand(configParams)
const cfConfig: GetDistributionConfigCommandOutput = await cloudFrontClient.send(getConfigCommand)
if (!cfConfig.ETag || !cfConfig.DistributionConfig) {
throw new ApiException(ErrorCode.CloudFrontDistributionNotFound)
}
const distributionConfig = cfConfig.DistributionConfig
const { DefaultCacheBehavior, CacheBehaviors } = distributionConfig
let fpCacheBehaviorsFound = 0
let fpCacheBehaviorsUpdated = 0
const invalidationPathPatterns: string[] = []
const fpCDNOrigins = getFPCDNOrigins(distributionConfig)
console.log('fpCDNOrigins.length', fpCDNOrigins?.length)
if (doesCacheBehaviorUseOrigins(DefaultCacheBehavior, fpCDNOrigins)) {
fpCacheBehaviorsFound++
const lambdaAssocList = getCacheBehaviorLambdaFunctionAssociations(DefaultCacheBehavior, lambdaFunctionName)
Iif (lambdaAssocList.length === 1) {
lambdaAssocList[0].LambdaFunctionARN = latestFunctionArn
fpCacheBehaviorsUpdated++
invalidationPathPatterns.push('/*')
console.info('Updated Fingerprint Pro Lambda@Edge function association in the default cache behavior')
} else {
console.info(
'The default cache behavior has targeted to FP CDN, but has no Fingerprint Pro Lambda@Edge association'
)
}
}
for (const cacheBehavior of CacheBehaviors?.Items || []) {
if (!doesCacheBehaviorUseOrigins(cacheBehavior, fpCDNOrigins)) {
continue
}
fpCacheBehaviorsFound++
const lambdaAssocList = getCacheBehaviorLambdaFunctionAssociations(cacheBehavior, lambdaFunctionName)
if (lambdaAssocList?.length === 1) {
lambdaAssocList[0].LambdaFunctionARN = latestFunctionArn
fpCacheBehaviorsUpdated++
if (cacheBehavior.PathPattern) {
let pathPattern = cacheBehavior.PathPattern
if (!cacheBehavior.PathPattern.startsWith('/')) {
pathPattern = '/' + pathPattern
}
invalidationPathPatterns.push(pathPattern)
console.info(
`Updated Fingerprint Pro Lambda@Edge function association in the cache behavior with path ${cacheBehavior.PathPattern}`
)
} else {
console.error(`Path pattern is not defined for cache behavior ${JSON.stringify(cacheBehavior)}`)
}
} else {
console.info(
`Cache behavior ${JSON.stringify(
cacheBehavior
)} has targeted to FP CDN, but has no Fingerprint Pro Lambda@Edge association`
)
}
}
if (fpCacheBehaviorsFound === 0) {
throw new ApiException(ErrorCode.CacheBehaviorNotFound)
}
if (fpCacheBehaviorsUpdated === 0) {
throw new ApiException(ErrorCode.LambdaFunctionAssociationNotFound)
}
if (invalidationPathPatterns.length === 0) {
throw new ApiException(ErrorCode.CacheBehaviorPatternNotDefined)
}
const updateParams: UpdateDistributionCommandInput = {
DistributionConfig: cfConfig.DistributionConfig,
Id: cloudFrontDistributionId,
IfMatch: cfConfig.ETag,
}
const updateConfigCommand = new UpdateDistributionCommand(updateParams)
let updateCFResult: UpdateFunctionCodeCommandOutput
let triedAttempts = 0
while (triedAttempts < CLOUDFRONT_CONFIG_UPDATE_ATTEMPT_COUNT) {
console.info(
`Attempt ${triedAttempts + 1}/${CLOUDFRONT_CONFIG_UPDATE_ATTEMPT_COUNT} started to update CloudFront config`
)
try {
updateCFResult = await cloudFrontClient.send(updateConfigCommand)
console.info(
`CloudFront config updated successfully on attempt ${triedAttempts + 1}/${CLOUDFRONT_CONFIG_UPDATE_ATTEMPT_COUNT}`
)
console.info(`CloudFront update has finished, ${JSON.stringify(updateCFResult)}`)
console.info('Going to invalidate routes for upgraded cache behavior')
invalidateFingerprintIntegrationCache(cloudFrontClient, cloudFrontDistributionId, invalidationPathPatterns).catch(
(e) => {
console.info(`Cache invalidation has failed: ${e.message}`)
}
)
return
} catch (e) {
console.error(
`Attempt ${triedAttempts + 1}/${CLOUDFRONT_CONFIG_UPDATE_ATTEMPT_COUNT} failed for updating CloudFront config`,
e
)
Iif (triedAttempts + 1 === CLOUDFRONT_CONFIG_UPDATE_ATTEMPT_COUNT) {
throw e
}
await delay(CLOUDFRONT_CONFIG_UPDATE_ATTEMPT_DELAY)
}
triedAttempts++
}
}
async function invalidateFingerprintIntegrationCache(
cloudFrontClient: CloudFrontClient,
distributionId: string,
pathPatterns: string[]
) {
const invalidationParams: CreateInvalidationCommandInput = {
DistributionId: distributionId,
InvalidationBatch: {
Paths: {
Quantity: 1,
Items: pathPatterns,
},
CallerReference: 'fingerprint-pro-management-lambda-function',
},
}
const invalidationCommand = new CreateInvalidationCommand(invalidationParams)
const invalidationResult = await cloudFrontClient.send(invalidationCommand)
console.info(`Invalidation has finished, ${JSON.stringify(invalidationResult)}`)
}
async function getLambdaFunctionInformation(
lambdaClient: LambdaClient,
functionName: string
): Promise<FunctionConfiguration | undefined> {
console.info(`Getting lambda function information for ${functionName}`)
const command = new GetFunctionCommand({
FunctionName: functionName,
})
console.info(`Sending get command to Lambda runtime with data ${JSON.stringify(command)}`)
const result = await lambdaClient.send(command)
console.info(`Got get command result: ${JSON.stringify(result)}`)
return result.Configuration
}
/**
* @throws {import("@aws-sdk/client-lambda").LambdaServiceException}
* @throws {ApiException}
*/
async function updateLambdaFunctionCode(
lambdaClient: LambdaClient,
functionName: string,
revisionId: string
): Promise<FunctionConfiguration> {
console.info('Preparing command to update function code')
const command = new UpdateFunctionCodeCommand({
S3Bucket: defaults.LAMBDA_DISTRIBUTION_BUCKET,
S3Key: defaults.LAMBDA_DISTRIBUTION_BUCKET_KEY,
FunctionName: functionName,
RevisionId: revisionId,
Publish: true,
})
console.info(`Sending update command to Lambda runtime with data ${JSON.stringify(command)}`)
let result: FunctionConfiguration
try {
result = await lambdaClient.send(command)
} catch (e) {
console.error(`Lambda function update has failed. Error: ${e}`)
throw new ApiException(ErrorCode.LambdaFunctionUpdateFailed)
}
console.info(`Got update command result: ${JSON.stringify(result)}`)
if (!result?.FunctionArn) {
throw new ApiException(ErrorCode.LambdaFunctionARNNotFound)
}
console.info(`Got Lambda function update result, functionARN: ${result.FunctionArn}`)
return result
}
async function listLambdaFunctionVersions(
lambdaClient: LambdaClient,
functionName: string
): Promise<FunctionConfiguration[]> {
console.info('Getting Lambda function versions')
const command = new ListVersionsByFunctionCommand({
FunctionName: functionName,
})
console.info(`Sending ListVersionsByFunctionCommand to with data ${JSON.stringify(command)}`)
const result = await lambdaClient.send(command)
console.info(`Got ListVersionsByFunctionCommand result: ${JSON.stringify(result)}`)
Iif (!result) {
throw new ApiException(ErrorCode.LambdaFunctionARNNotFound)
}
return result.Versions || []
}
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