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Sprinter.swift
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Sprinter.swift
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// Copyright 2019 (c) Andrea Scuderi - https://github.com/swift-sprinter
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
import Foundation
public class Sprinter<API: LambdaAPI> {
let apiClient: API
let handlerName: String
var lambdas: [String: LambdaHandler]
let environment: [String: String]
public init(environment: [String: String] = ProcessInfo.processInfo.environment) throws {
self.lambdas = [:]
self.environment = environment
guard let runtime = environment.awsEnv(key: .lambdaRuntimeApi) else {
throw SprinterError.missingEnvironmentVariables(.lambdaRuntimeApi)
}
guard let handler = environment.awsEnv(key: .handler) else {
throw SprinterError.missingEnvironmentVariables(.handler)
}
guard let periodIndex = handler.firstIndex(of: ".") else {
throw SprinterError.invalidHandlerName(handler)
}
self.apiClient = try API(awsLambdaRuntimeAPI: runtime)
self.handlerName = String(handler[handler.index(after: periodIndex)...])
}
public func register(handler name: String, lambda: LambdaHandler) {
lambdas[name] = lambda
}
public func register(handler name: String, lambda: @escaping SyncDictionaryLambda) {
let lambda = DictionarySyncLambdaHandler(completionHandler: lambda)
lambdas[name] = lambda
}
public func register(handler name: String, lambda: @escaping AsyncDictionaryLambda) {
let lambda = DictionaryAsyncLambdaHandler(completionHandler: lambda)
lambdas[name] = lambda
}
public func register<Event: Decodable, Response: Encodable>(handler name: String,
lambda: @escaping SyncCodableLambda<Event, Response>) {
let lambda = CodableSyncLambdaHandler(handlerFunction: lambda)
lambdas[name] = lambda
}
public func register<Event: Decodable, Response: Encodable>(handler name: String,
lambda: @escaping AsyncCodableLambda<Event, Response>) {
let lambda = CodableAsyncLambdaHandler(handlerFunction: lambda)
lambdas[name] = lambda
}
internal var cancel = false
internal var counter = 0
/**
Run lambda. Call this function after the registration of the lambdas.
- Throws: `SprinterErorr`
*/
public func run() throws {
while !cancel {
let (event, responseHeaders) = try apiClient.getNextInvocation()
counter += 1
if let lambdaRuntimeTraceId = responseHeaders.rhk(key: .runtimeTraceId) {
setenv(Context.AWSEnvironmentKey.xAmznTraceId.rawValue, lambdaRuntimeTraceId, 0)
}
guard let lambda = lambdas[handlerName] else {
try apiClient.postInitializationError(error: SprinterError.missingEnvironmentVariables(.handler))
return
}
let context = try Context(environment: environment, responseHeaders: responseHeaders)
let result = lambda.commonHandler(event: event, context: context)
switch result {
case .success(let outputData):
try apiClient.postInvocationResponse(for: context.awsRequestId, httpBody: outputData)
case .failure(let error):
try apiClient.postInvocationError(for: context.awsRequestId, error: error)
}
}
}
}