mirror of
https://github.com/Sea-Haven-Industries/procurement-ingest.git
synced 2026-09-30 13:03:14 +00:00
0615aa5b77
Page when any message lands in the EmailProcessorDlq, which means a PO email was permanently dropped after po-email-processor exhausted its async Lambda retries. Without this, the errors alarm catches the failing invocations but nothing surfaces the resulting dead-lettered email. AWS/SQS ApproximateNumberOfMessagesVisible, Maximum over a single 5-min period > 0, notBreaching on missing data. Reuses the shared site-alerts SNS topic, ALARM-only, matching the existing po-email-processor-errors alarm. The metric helper derives the QueueName dimension from the queue construct (Fn::GetAtt QueueName), so the alarm tracks the CDK-generated queue name without hardcoding it.
499 lines
21 KiB
Python
499 lines
21 KiB
Python
"""CDK stack for the Coupa PO email ingestion pipeline."""
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import aws_cdk as cdk
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from aws_cdk import (
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Duration,
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RemovalPolicy,
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Stack,
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aws_cloudwatch as cloudwatch,
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aws_cloudwatch_actions as cw_actions,
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aws_dynamodb as dynamodb,
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aws_kms as kms,
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aws_lambda as lambda_,
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aws_lambda_event_sources as lambda_event_sources,
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aws_logs as logs,
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aws_s3 as s3,
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aws_s3_notifications as s3n,
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aws_ses as ses,
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aws_ses_actions as ses_actions,
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aws_secretsmanager as secretsmanager,
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aws_sns as sns,
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aws_sqs as sqs,
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aws_ssm as ssm,
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)
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from constructs import Construct
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# Operations these tables actually issue (PutItem/UpdateItem/DeleteItem writes,
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# GetItem/Query/BatchGetItem reads). DynamoDB emits ThrottledRequests/SystemErrors
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# keyed by TableName + Operation only, so the CDK *_for_operations helpers (which
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# render a SUM MathExpression across these per-operation metrics) are the correct,
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# non-deprecated way to roll a table up to a single alarmable series.
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_DDB_ALARM_OPERATIONS = [
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dynamodb.Operation.GET_ITEM,
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dynamodb.Operation.BATCH_GET_ITEM,
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dynamodb.Operation.QUERY,
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dynamodb.Operation.SCAN,
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dynamodb.Operation.PUT_ITEM,
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dynamodb.Operation.UPDATE_ITEM,
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dynamodb.Operation.DELETE_ITEM,
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dynamodb.Operation.BATCH_WRITE_ITEM,
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]
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def _add_ddb_alarms(scope, id_prefix, table, alarm_name_prefix, alarm_topic):
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"""Add throttle + system-error alarms for a DynamoDB table.
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Both fire on any non-zero datapoint in a 5-min window. ALARM-only SnsAction
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to site-alerts (no OK action); TreatMissingData NOT_BREACHING.
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"""
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table.metric_throttled_requests_for_operations(
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operations=_DDB_ALARM_OPERATIONS,
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period=Duration.minutes(5),
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statistic="Sum",
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).create_alarm(
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scope,
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f"{id_prefix}ThrottlesAlarm",
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alarm_name=f"{alarm_name_prefix}-throttles",
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alarm_description=f"{alarm_name_prefix} DynamoDB throttled requests",
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threshold=0,
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evaluation_periods=1,
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comparison_operator=cloudwatch.ComparisonOperator.GREATER_THAN_THRESHOLD,
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treat_missing_data=cloudwatch.TreatMissingData.NOT_BREACHING,
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).add_alarm_action(cw_actions.SnsAction(alarm_topic))
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table.metric_system_errors_for_operations(
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operations=_DDB_ALARM_OPERATIONS,
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period=Duration.minutes(5),
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statistic="Sum",
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).create_alarm(
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scope,
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f"{id_prefix}SystemErrorsAlarm",
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alarm_name=f"{alarm_name_prefix}-system-errors",
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alarm_description=f"{alarm_name_prefix} DynamoDB server-side (5xx) errors",
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threshold=0,
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evaluation_periods=1,
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comparison_operator=cloudwatch.ComparisonOperator.GREATER_THAN_THRESHOLD,
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treat_missing_data=cloudwatch.TreatMissingData.NOT_BREACHING,
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).add_alarm_action(cw_actions.SnsAction(alarm_topic))
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class PoIngestStack(Stack):
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def __init__(self, scope: Construct, construct_id: str, **kwargs):
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super().__init__(scope, construct_id, **kwargs)
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# --- Shared alarm SNS topic (site-alerts) ---
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# Imported once near the top so every alarm in this stack reuses the same
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# Topic construct instance (avoids duplicate logical IDs). ALARM-only
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# SnsAction; no OK action, per the CloudWatch-alarm preference. The
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# topic's CMK (alias/seahaven-alarm-topics) lives on the topic itself.
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alarm_topic = sns.Topic.from_topic_arn(
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self,
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"SiteAlertsTopic",
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f"arn:aws:sns:{self.region}:{self.account}:site-alerts",
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)
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# --- S3 bucket for raw emails ---
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email_bucket = s3.Bucket(
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self,
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"EmailBucket",
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bucket_name=f"po-ingest-emails-{self.account}",
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block_public_access=s3.BlockPublicAccess.BLOCK_ALL,
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removal_policy=RemovalPolicy.RETAIN,
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lifecycle_rules=[
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s3.LifecycleRule(expiration=Duration.days(90)),
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],
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)
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# --- Shared customer-managed CMK for sensitive DynamoDB tables ---
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# Owned by the account-baseline app (alias/seahaven-dynamodb, INFRA-95 /
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# M-3); ARN published to SSM. The purchase-orders table was migrated to
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# SSE-KMS out-of-band, so declaring encryption_key here reconciles the
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# drift and — via grant_read_write_data below — propagates the required
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# kms:Decrypt/GenerateDataKey/DescribeKey to the consumer roles.
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dynamodb_cmk = kms.Key.from_key_arn(
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self,
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"DynamoDbCmk",
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ssm.StringParameter.value_for_string_parameter(
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self, "/seahaven/dynamodb/cmk-arn"
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),
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)
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# --- Purchase-orders DynamoDB table ---
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# Owned by this stack. Streams enabled for the site-extractor pipeline.
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# Other stacks (seahaven-slack-bot) reference this table via fromTableName().
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po_table = dynamodb.Table(
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self,
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"PurchaseOrdersTable",
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table_name="purchase-orders",
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partition_key=dynamodb.Attribute(
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name="po_number",
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type=dynamodb.AttributeType.STRING,
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),
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billing_mode=dynamodb.BillingMode.PAY_PER_REQUEST,
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removal_policy=RemovalPolicy.RETAIN,
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stream=dynamodb.StreamViewType.NEW_IMAGE,
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encryption=dynamodb.TableEncryption.CUSTOMER_MANAGED,
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encryption_key=dynamodb_cmk,
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)
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# --- Secrets Manager for Anthropic API key ---
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anthropic_secret = secretsmanager.Secret(
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self,
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"AnthropicApiKey",
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secret_name="po-ingest/anthropic-api-key",
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description="Anthropic API key for Coupa PO email parsing",
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removal_policy=RemovalPolicy.RETAIN,
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)
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# --- DLQ for failed async invocations (INFRA-41 / audit H-8) ---
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# SES → S3 → Lambda is async; without an OnFailure destination a failed
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# parse (bad email, transient error) is silently dropped after Lambda's
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# retries. CDK generates the queue name to avoid colliding with the
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# interim CLI-created po-email-processor-dlq (removed post-deploy).
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email_processor_dlq = sqs.Queue(
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self,
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"EmailProcessorDlq",
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retention_period=Duration.days(14),
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enforce_ssl=True,
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)
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# --- Lambda function ---
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email_processor = lambda_.Function(
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self,
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"EmailProcessor",
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function_name="po-email-processor",
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runtime=lambda_.Runtime.PYTHON_3_12,
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architecture=lambda_.Architecture.ARM_64,
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handler="handler.handler",
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code=lambda_.Code.from_asset(
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"../lambdas/po/email_processor",
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bundling=cdk.BundlingOptions(
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image=lambda_.Runtime.PYTHON_3_12.bundling_image,
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command=[
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"bash",
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"-c",
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"pip install --platform manylinux2014_aarch64 --only-binary=:all: "
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"-r requirements.txt -t /asset-output && "
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"cp handler.py /asset-output/",
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],
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),
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),
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timeout=Duration.seconds(60),
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memory_size=256,
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log_retention=logs.RetentionDays.TWO_MONTHS,
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dead_letter_queue=email_processor_dlq,
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environment={
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"PO_TABLE": "purchase-orders",
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"ANTHROPIC_API_KEY_SECRET_ARN": anthropic_secret.secret_arn,
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},
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)
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# Grant permissions
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email_bucket.grant_read(email_processor)
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po_table.grant_read_write_data(email_processor)
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anthropic_secret.grant_read(email_processor)
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# --- Errors alarm (INFRA-41 / audit H-8) ---
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# ALARM-only (no OK action, per the CloudWatch-alarm preference) to the
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# shared site-alerts topic. Any errored invocation in a 5-min window pages.
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email_processor.metric_errors(
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period=Duration.minutes(5),
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statistic="Sum",
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).create_alarm(
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self,
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"EmailProcessorErrorsAlarm",
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alarm_name="po-email-processor-errors",
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alarm_description="po-email-processor async invocation errors",
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threshold=0,
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evaluation_periods=1,
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comparison_operator=cloudwatch.ComparisonOperator.GREATER_THAN_THRESHOLD,
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treat_missing_data=cloudwatch.TreatMissingData.NOT_BREACHING,
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).add_alarm_action(cw_actions.SnsAction(alarm_topic))
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# --- Throttles alarm: po-email-processor ---
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# Any throttled invocation (concurrency cap hit) in a 5-min window pages.
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# ALARM-only to site-alerts; no OK action; NOT_BREACHING when no data.
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email_processor.metric_throttles(
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period=Duration.minutes(5),
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statistic="Sum",
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).create_alarm(
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self,
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"EmailProcessorThrottlesAlarm",
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alarm_name="po-email-processor-throttles",
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alarm_description="po-email-processor invocation throttles",
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threshold=0,
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evaluation_periods=1,
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comparison_operator=cloudwatch.ComparisonOperator.GREATER_THAN_THRESHOLD,
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treat_missing_data=cloudwatch.TreatMissingData.NOT_BREACHING,
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).add_alarm_action(cw_actions.SnsAction(alarm_topic))
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# --- DLQ messages-present alarm ---
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# Pages when any message lands in the EmailProcessorDlq: a message here
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# means a PO email was permanently dropped after Lambda exhausted its
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# async retries. Maximum over a single 5-min window > 0 fires; missing
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# data (no messages metric emitted) is not breaching. Reuses the shared
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# site-alerts topic, ALARM-only, like the errors alarm above. The metric
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# helper derives the QueueName dimension from the queue construct, so the
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# alarm tracks the CDK-generated queue name without hardcoding it.
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email_processor_dlq.metric_approximate_number_of_messages_visible(
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period=Duration.minutes(5),
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statistic="Maximum",
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).create_alarm(
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self,
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"EmailProcessorDlqMessagesAlarm",
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alarm_name="po-email-processor-dlq-messages",
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alarm_description="po-email-processor DLQ has messages (dropped PO emails)",
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threshold=0,
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evaluation_periods=1,
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comparison_operator=cloudwatch.ComparisonOperator.GREATER_THAN_THRESHOLD,
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treat_missing_data=cloudwatch.TreatMissingData.NOT_BREACHING,
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).add_alarm_action(cw_actions.SnsAction(alarm_topic))
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# --- Duration alarm: po-email-processor (orphan adoption) ---
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# Adopts the orphaned CLI alarm Lambda-Duration-po-email-processor under
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# the repo's <fn>-duration naming (NEW logical name → no deploy collision;
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# delete the orphan post-deploy). p99 / 45000 ms
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# (75% of the 60s timeout) / eval 3 of 3 — tighter than the orphan's
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# Maximum>=48000 / 1-of-1.
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email_processor.metric_duration(
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period=Duration.minutes(5),
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statistic="p99",
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).create_alarm(
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self,
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"EmailProcessorDurationAlarm",
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alarm_name="po-email-processor-duration",
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alarm_description="po-email-processor p99 duration approaching the 60s timeout",
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threshold=45000,
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evaluation_periods=3,
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datapoints_to_alarm=2,
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comparison_operator=cloudwatch.ComparisonOperator.GREATER_THAN_OR_EQUAL_TO_THRESHOLD,
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treat_missing_data=cloudwatch.TreatMissingData.NOT_BREACHING,
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).add_alarm_action(cw_actions.SnsAction(alarm_topic))
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# S3 event notification → Lambda
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email_bucket.add_event_notification(
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s3.EventType.OBJECT_CREATED,
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s3n.LambdaDestination(email_processor),
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s3.NotificationKeyFilter(prefix="inbound/"),
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)
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# --- SES Receipt Rule ---
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# Reuse the existing INBOUND_MAIL rule set (shared with workorder-ingest)
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rule_set = ses.ReceiptRuleSet.from_receipt_rule_set_name(
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self,
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"ExistingRuleSet",
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"INBOUND_MAIL",
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)
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rule_set.add_rule(
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"PoEmailRule",
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recipients=["amazon_po@int.seahaven.com"],
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actions=[
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ses_actions.S3(
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bucket=email_bucket,
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object_key_prefix="inbound/",
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),
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],
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)
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# --- Web UI Lambda ---
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web_ui = lambda_.Function(
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self,
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"WebUI",
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function_name="po-web-ui",
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runtime=lambda_.Runtime.PYTHON_3_12,
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architecture=lambda_.Architecture.ARM_64,
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handler="handler.handler",
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code=lambda_.Code.from_asset("../lambdas/po/web_ui"),
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timeout=Duration.seconds(60),
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memory_size=256,
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log_retention=logs.RetentionDays.TWO_MONTHS,
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environment={
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"PO_TABLE": "purchase-orders",
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},
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)
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po_table.grant_read_data(web_ui)
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# --- Throttles alarm: po-web-ui ---
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web_ui.metric_throttles(
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period=Duration.minutes(5),
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statistic="Sum",
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).create_alarm(
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self,
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"WebUiThrottlesAlarm",
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alarm_name="po-web-ui-throttles",
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alarm_description="po-web-ui invocation throttles",
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threshold=0,
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evaluation_periods=1,
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comparison_operator=cloudwatch.ComparisonOperator.GREATER_THAN_THRESHOLD,
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treat_missing_data=cloudwatch.TreatMissingData.NOT_BREACHING,
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).add_alarm_action(cw_actions.SnsAction(alarm_topic))
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# --- Duration alarm: po-web-ui ---
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# Net-new (no orphan exists for this function).
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# p99 / 45000 ms (75% of the 60s timeout) / eval 3, datapoints 2.
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web_ui.metric_duration(
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period=Duration.minutes(5),
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statistic="p99",
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).create_alarm(
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self,
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"WebUiDurationAlarm",
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alarm_name="po-web-ui-duration",
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alarm_description="po-web-ui p99 duration approaching the 60s timeout",
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threshold=45000,
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evaluation_periods=3,
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datapoints_to_alarm=2,
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comparison_operator=cloudwatch.ComparisonOperator.GREATER_THAN_OR_EQUAL_TO_THRESHOLD,
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treat_missing_data=cloudwatch.TreatMissingData.NOT_BREACHING,
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).add_alarm_action(cw_actions.SnsAction(alarm_topic))
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# Public Function URL removed 2026-06-08 (INFRA-74 / audit C-5): the
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# unauthenticated FunctionUrlAuthType.NONE URL was deleted out-of-band
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# via CLI. Removing the construct (and its auto-generated Principal:*
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# invoke permission) reconciles IaC with the live state.
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# --- Verified sites table (extracted from PO ship-to addresses) ---
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verified_sites_table = dynamodb.Table(
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self,
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"VerifiedSitesTable",
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table_name="verified-sites",
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partition_key=dynamodb.Attribute(
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name="siteCode",
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type=dynamodb.AttributeType.STRING,
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),
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billing_mode=dynamodb.BillingMode.PAY_PER_REQUEST,
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removal_policy=RemovalPolicy.RETAIN,
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)
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# by-state GSI removed 2026-06-03 (audit M-20): 0 reads in 30d against
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# 518 WCU of write amplification. Re-add if a state-level query path ships.
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# --- Site extractor Lambda (DynamoDB Streams → verified-sites) ---
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site_extractor = lambda_.Function(
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self,
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"SiteExtractor",
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function_name="po-ingest-site-extractor",
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runtime=lambda_.Runtime.PYTHON_3_12,
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architecture=lambda_.Architecture.ARM_64,
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handler="handler.handler",
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code=lambda_.Code.from_asset("../lambdas/po/site_extractor"),
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timeout=Duration.seconds(60),
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memory_size=256,
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log_retention=logs.RetentionDays.TWO_MONTHS,
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environment={
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"VERIFIED_SITES_TABLE": verified_sites_table.table_name,
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"PENDING_REVIEW_TABLE": "pending-site-review",
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},
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)
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verified_sites_table.grant_read_write_data(site_extractor)
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site_extractor.add_event_source(
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lambda_event_sources.DynamoEventSource(
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po_table,
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starting_position=lambda_.StartingPosition.TRIM_HORIZON,
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batch_size=10,
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max_batching_window=Duration.seconds(30),
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bisect_batch_on_error=True,
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retry_attempts=3,
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)
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)
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# --- Errors alarm: po-ingest-site-extractor ---
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# Stream-consumer errors retry per the event-source config, but a
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# persistent failure stalls the verified-sites pipeline. ALARM-only to
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# site-alerts; no OK action; NOT_BREACHING when no data.
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site_extractor.metric_errors(
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period=Duration.minutes(5),
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statistic="Sum",
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).create_alarm(
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self,
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"SiteExtractorErrorsAlarm",
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alarm_name="po-ingest-site-extractor-errors",
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alarm_description="po-ingest-site-extractor invocation errors",
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threshold=0,
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evaluation_periods=1,
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comparison_operator=cloudwatch.ComparisonOperator.GREATER_THAN_THRESHOLD,
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treat_missing_data=cloudwatch.TreatMissingData.NOT_BREACHING,
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).add_alarm_action(cw_actions.SnsAction(alarm_topic))
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# --- Throttles alarm: po-ingest-site-extractor ---
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site_extractor.metric_throttles(
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period=Duration.minutes(5),
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statistic="Sum",
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).create_alarm(
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self,
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"SiteExtractorThrottlesAlarm",
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alarm_name="po-ingest-site-extractor-throttles",
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alarm_description="po-ingest-site-extractor invocation throttles",
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threshold=0,
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evaluation_periods=1,
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comparison_operator=cloudwatch.ComparisonOperator.GREATER_THAN_THRESHOLD,
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treat_missing_data=cloudwatch.TreatMissingData.NOT_BREACHING,
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).add_alarm_action(cw_actions.SnsAction(alarm_topic))
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# --- Duration alarm: po-ingest-site-extractor ---
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# Net-new (no orphan exists for this function).
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# p99 / 45000 ms (75% of the 60s timeout) / eval 3, datapoints 2.
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site_extractor.metric_duration(
|
|
period=Duration.minutes(5),
|
|
statistic="p99",
|
|
).create_alarm(
|
|
self,
|
|
"SiteExtractorDurationAlarm",
|
|
alarm_name="po-ingest-site-extractor-duration",
|
|
alarm_description="po-ingest-site-extractor p99 duration approaching the 60s timeout",
|
|
threshold=45000,
|
|
evaluation_periods=3,
|
|
datapoints_to_alarm=2,
|
|
comparison_operator=cloudwatch.ComparisonOperator.GREATER_THAN_OR_EQUAL_TO_THRESHOLD,
|
|
treat_missing_data=cloudwatch.TreatMissingData.NOT_BREACHING,
|
|
).add_alarm_action(cw_actions.SnsAction(alarm_topic))
|
|
|
|
cdk.CfnOutput(
|
|
self,
|
|
"VerifiedSitesTableName",
|
|
value=verified_sites_table.table_name,
|
|
description="Verified site addresses extracted from POs",
|
|
)
|
|
|
|
# --- Pending site review table (POs with no extractable site code) ---
|
|
pending_review_table = dynamodb.Table(
|
|
self,
|
|
"PendingSiteReviewTable",
|
|
table_name="pending-site-review",
|
|
partition_key=dynamodb.Attribute(
|
|
name="po_number",
|
|
type=dynamodb.AttributeType.STRING,
|
|
),
|
|
billing_mode=dynamodb.BillingMode.PAY_PER_REQUEST,
|
|
removal_policy=RemovalPolicy.RETAIN,
|
|
)
|
|
|
|
pending_review_table.grant_read_write_data(site_extractor)
|
|
verified_sites_table.grant_read_data(site_extractor)
|
|
|
|
# --- DynamoDB throttle + system-error alarms ---
|
|
# ThrottledRequests / SystemErrors emit at TableName + Operation only
|
|
# (verified against live CloudWatch: no TableName-only rollup exists, and
|
|
# metric_throttled_requests is deprecated/invalid in aws-cdk-lib 2.259.0).
|
|
# Each table currently has zero throttle/error datapoints, so the series
|
|
# only materialise on first occurrence — NOT_BREACHING keeps them OK until
|
|
# then.
|
|
_add_ddb_alarms(
|
|
self, "PurchaseOrdersTable", po_table, "purchase-orders", alarm_topic
|
|
)
|
|
_add_ddb_alarms(
|
|
self,
|
|
"VerifiedSitesTable",
|
|
verified_sites_table,
|
|
"verified-sites",
|
|
alarm_topic,
|
|
)
|
|
_add_ddb_alarms(
|
|
self,
|
|
"PendingSiteReviewTable",
|
|
pending_review_table,
|
|
"pending-site-review",
|
|
alarm_topic,
|
|
)
|