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Migration

Use this as a guide for migrating between major versions of Substation.

v2.0.0

Applications (cmd/)

AWS Lambda Handlers

Multiple AWS Lambda handlers were renamed to better reflect the AWS service they interact with:

  • Renamed AWS_KINESIS_DATA_FIREHOSE to AWS_DATA_FIREHOSE.
  • Renamed AWS_KINESIS to AWS_KINESIS_DATA_STREAM.
  • Renamed AWS_DYNAMODB to AWS_DYNAMODB_STREAM.

v1.x.x:

module "node" {
  source    = "build/terraform/aws/lambda"

  config = {
    name        = "node"
    description = "Substation node that is invoked by a Kinesis Data Stream."
    image_uri   = "123456789012.dkr.ecr.us-east-1.amazonaws.com/substation:v1.0.0"
    image_arm   = true

    env = {
      "SUBSTATION_CONFIG" : "http://localhost:2772/applications/substation/environments/example/configurations/node"
      "SUBSTATION_LAMBDA_HANDLER" : "AWS_KINESIS"
    }
  }
}

v2.x.x:

module "node" {
  source    = "build/terraform/aws/lambda"

  config = {
    name        = "node"
    description = "Substation node that is invoked by a Kinesis Data Stream."
    image_uri   = "123456789012.dkr.ecr.us-east-1.amazonaws.com/substation:v2.0.0"
    image_arm   = true

    env = {
      "SUBSTATION_CONFIG" : "http://localhost:2772/applications/substation/environments/example/configurations/node"
      "SUBSTATION_LAMBDA_HANDLER" : "AWS_KINESIS_DATA_STREAM"
    }
  }
}

Conditions (condition/)

Conditioner Interface

The Inspector interface was renamed to Conditioner to standardize the naming convention used across the project.

meta.condition Condition

This is replaced by the meta.all, meta.any, and meta.none conditions.

v1.x.x:

sub.cnd.all([
  sub.cnd.str.eq({ value: 'FOO' }),
  sub.cnd.meta.condition({ condition: sub.cnd.any([
    sub.cnd.str.eq({ value: 'BAR' }),
    sub.cnd.str.eq({ value: 'BAZ' }),
  ]) }),
]),

v2.x.x:

sub.cnd.all([
  sub.cnd.str.eq({ value: 'FOO' }),
  sub.cnd.any([
    sub.cnd.str.eq({ value: 'BAR' }),
    sub.cnd.str.eq({ value: 'BAZ' }),
  ]),
]),

meta.for_each Condition

This is replaced by the meta.all, meta.any, and meta.none conditions. If the object.source_key value is an array, then the data is treated as a list of elements.

v1.x.x:

sub.cnd.meta.for_each({
  object: { source_key: 'field' },
  type: 'any',
  inspector: sub.cnd.str.eq({ value: 'FOO' }),
})

v2.x.x:

sub.cnd.meta.any({
  object: { source_key: 'field' },
  conditions: [ sub.cnd.str.eq({ value: 'FOO' }) ],
})

meta.negate Condition

This is replaced by the meta.none Condition.

v1.x.x:

sub.cnd.meta.negate({ inspector: sub.cnd.str.eq({ value: 'FOO' }) })

v2.x.x:

sub.cnd.meta.none({ conditions: [ sub.cnd.str.eq({ value: 'FOO' }) ] })
sub.cnd.none([ sub.cnd.str.eq({ value: 'FOO' }) ])

meta.err Condition

This is removed and was not replaced. Remove any references to this inspector.

Transforms (transforms)

send.aws.* Transforms

The AWS resource fields were replaced by an aws object field that contains the sub-fields arn and assume_role_arn. The region for each AWS client is derived from either the resource ARN or assumed role ARN.

v1.x.x:

sub.tf.send.aws.s3({
  bucket_name: 'substation',
  file_path: { time_format: '2006/01/02/15', uuid: true, suffix: '.json' },
}),

v2.x.x:

sub.tf.send.aws.s3({
  aws: { arn: 'arn:aws:s3:::substation' },
  file_path: { time_format: '2006/01/02/15', uuid: true, suffix: '.json' },
}),

NOTE: This change also applies to every configuration that relies on an AWS resource.

meta.* Transforms

The transform field is removed from all transforms and was replaced with the transforms field.

v1.x.x:

sub.tf.meta.switch({ cases: [
  {
    condition: sub.cnd.all([
      sub.cnd.str.eq({ obj: { source_key: 'field' }, value: 'FOO' }),
    ]),
    transform: sub.tf.obj.insert({ object: { target_key: 'field' }, value: 'BAR' }),
  },
]})

v2.x.x:

sub.tf.meta.switch({ cases: [
  {
    condition: sub.cnd.str.eq({ obj: { source_key: 'field' }, value: 'FOO' }),
    transforms: [
      sub.tf.obj.insert({ object: { target_key: 'field' }, value: 'BAR' })
    ],
  },
]})

meta.retry Transform

Retry settings were removed from all transforms and replaced by the meta.retry transform. It is recommended to create a reusable pattern for common retry scenarios.

v1.x.x:

sub.tf.send.aws.sqs({
  arn: 'arn:aws:sqs:us-east-1:123456789012:substation',
  retry: { count: 3 },
})

v2.x.x:

sub.tf.meta.retry({
  retry: { count: 3, delay: '1s' },
  transforms: [
    sub.tf.send.aws.sqs({
      aws: { arn: 'arn:aws:sqs:us-east-1:123456789012:substation' },
    }),
  ],
})

NOTE: For AWS services, retries for the client can be configured in Terraform by using the AWS_MAX_ATTEMPTS environment variable. This is used in addition the meta.retry transform.

meta.pipeline Transform

This is removed and was not replaced. Remove any references to this transform and replace it with the transforms field used in other meta transforms.

send.aws.dynamodb Transform

The send.aws.dynamodb transform was renamed to send.aws.dynamodb.put.

v1.x.x:

sub.tf.send.aws.dynamodb({
  table_name: 'substation',
}),

v2.x.x:

sub.tf.send.aws.dynamodb.put({
  aws: { arn: 'arn:aws:dynamodb:us-east-1:123456789012:table/substation' },
}),

enrich.aws.dynamodb Transform

The enrich.aws.dynamodb transform was renamed to enrich.aws.dynamodb.query, and had these additional changes:

  • PartitionKey and SortKey now reference the column names in the DynamoDB table and are nested under the Attributes field.
  • By default, the value retrieved from Object.SourceKey is used as the PartitionKey value. If the SortKey is provided and the value from Object.SourceKey is an array, then the first element is used as the PartitionKey value and the second element is used as the SortKey value.
  • The KeyConditionExpression field was removed because this is now a derived value.

v1.x.x:

// In v1.x.x, the DynamoDB column names must always be 'PK' and/or 'SK'.
sub.tf.obj.cp({ object: { src: 'id', trg: 'meta ddb.PK' } }),
sub.transform.enrich.aws.dynamodb({
  object: { source_key: 'meta ddb', target_key: 'user' },
  table_name: 'substation',
  partition_key: 'PK',
  key_condition_expression: 'PK = :PK',
}),

v2.x.x:

sub.transform.enrich.aws.dynamodb.query({
  object: { source_key: 'id', target_key: 'user' },
  aws: { arn: 'arn:aws:dynamodb:us-east-1:123456789012:table/substation' },
  attributes: {
    partition_key: 'PK',
  },
}),

send.aws.kinesis_data_firehose Transform

The send.aws.kinesis_data_firehose transform was renamed to send.aws.data_firehose.

v1.x.x:

sub.tf.send.aws.kinesis_data_firehose({
  stream_name: 'substation',
}),

v2.x.x:

sub.tf.send.aws.data_firehose({
  aws: { arn: 'arn:aws:kinesis:us-east-1:123456789012:stream/substation' },
}),