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index.js
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index.js
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class ServerlessPlugin {
constructor (serverless, options) {
this.serverless = serverless
this.options = options
this.hooks = {
'before:package:finalize': this.createResources.bind(this)
}
}
/**
* Adding resources
*/
createResources () {
const tablesConfig = this.serverless.service.custom.tables
if (tablesConfig === undefined) {
return
}
Object.keys(tablesConfig).forEach((tableKey) => {
const tableConfig = tablesConfig[tableKey]
if (!tableConfig.name) {
return
}
const schema = {
'Type': 'AWS::DynamoDB::Table',
'Properties': {
'TableName': tableConfig.name,
'AttributeDefinitions': [],
'KeySchema': [],
'ProvisionedThroughput': {
'ReadCapacityUnits': tableConfig.throughput && tableConfig.throughput.read ? tableConfig.throughput.read : 1,
'WriteCapacityUnits': tableConfig.throughput && tableConfig.throughput.write ? tableConfig.throughput.write : 1
}
}
}
if (tableConfig.primaryKey) {
schema.Properties.AttributeDefinitions.push({
'AttributeName': tableConfig.primaryKey.name,
'AttributeType': tableConfig.primaryKey.type || 'S'
})
schema.Properties.KeySchema.push({
'AttributeName': tableConfig.primaryKey.name,
'KeyType': 'HASH'
})
}
if (tableConfig.rangeKey) {
schema.Properties.AttributeDefinitions.push({
'AttributeName': tableConfig.rangeKey.name,
'AttributeType': tableConfig.rangeKey.type || 'S'
})
schema.Properties.KeySchema.push({
'AttributeName': tableConfig.rangeKey.name,
'KeyType': 'RANGE'
})
}
if (tableConfig.ttl) {
schema.Properties.TimeToLiveSpecification = {
'AttributeName': tableConfig.ttl.attribute,
'Enabled': tableConfig.ttl.enabled || true
}
}
const CFKey = tableKey.charAt(0).toUpperCase() + tableKey.slice(1)
this.serverless.service.provider.compiledCloudFormationTemplate.Resources[`Table${CFKey}`] = schema
})
this.updatePolicy()
}
/**
* Update policy to use DynamoDB tables
*/
updatePolicy () {
if (this.serverless.service.custom.skipTablePolicy === true) {
return
}
const tablesConfig = this.serverless.service.custom.tables
const iamRole = this.serverless.service.provider.compiledCloudFormationTemplate.Resources['IamRoleLambdaExecution']
if (iamRole === undefined) {
return
}
const policy = iamRole.Properties.Policies[0]
if (policy === undefined) {
return
}
const resources = []
Object.keys(tablesConfig).forEach((tableKey) => {
const tableConfig = tablesConfig[tableKey]
resources.push({
// eslint-disable-next-line no-template-curly-in-string
'Fn::Sub': 'arn:aws:dynamodb:${AWS::Region}:${AWS::AccountId}:table/' + tableConfig.name
})
})
policy.PolicyDocument.Statement.push({
'Effect': 'Allow',
'Action': [
'dynamodb:*'
],
'Resource': resources
})
}
}
module.exports = ServerlessPlugin