distributed-fork-aws-lambda (empty) → 0.0.1.0
raw patch · 10 files changed
+1661/−0 lines, 10 filesdep +SHAdep +aesondep +aeson-qq
Dependencies added: SHA, aeson, aeson-qq, amazonka, amazonka-cloudformation, amazonka-core, amazonka-lambda, amazonka-s3, amazonka-sqs, async, base, base64-bytestring, bytestring, containers, distributed-fork, distributed-fork-aws-lambda, interpolate, lens, lens-aeson, safe-exceptions, stratosphere, tasty, tasty-hunit, text, time, typed-process, unordered-containers, zip-archive
Files
- LICENSE +674/−0
- distributed-fork-aws-lambda.cabal +65/−0
- src/Control/Concurrent/Throttled.hs +30/−0
- src/Control/Distributed/Fork/Lambda.hs +167/−0
- src/Control/Distributed/Fork/Lambda/Internal/Archive.hs +129/−0
- src/Control/Distributed/Fork/Lambda/Internal/Constants.hs +16/−0
- src/Control/Distributed/Fork/Lambda/Internal/Invoke.hs +196/−0
- src/Control/Distributed/Fork/Lambda/Internal/Stack.hs +308/−0
- src/Control/Distributed/Fork/Lambda/Internal/Types.hs +20/−0
- test/Test.hs +56/−0
+ LICENSE view
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Of course, your program's commands+might be different; for a GUI interface, you would use an "about box".++ You should also get your employer (if you work as a programmer) or school,+if any, to sign a "copyright disclaimer" for the program, if necessary.+For more information on this, and how to apply and follow the GNU GPL, see+<http://www.gnu.org/licenses/>.++ The GNU General Public License does not permit incorporating your program+into proprietary programs. If your program is a subroutine library, you+may consider it more useful to permit linking proprietary applications with+the library. If this is what you want to do, use the GNU Lesser General+Public License instead of this License. But first, please read+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
+ distributed-fork-aws-lambda.cabal view
@@ -0,0 +1,65 @@+name: distributed-fork-aws-lambda+version: 0.0.1.0+synopsis: AWS Lambda backend for distributed-fork.+homepage: https://github.com/utdemir/distributed-fork+license: BSD3+license-file: LICENSE+author: Utku Demir+maintainer: me@utdemir.com+copyright: Utku Demir+category: Web+build-type: Simple+cabal-version: >=1.10++description:+ <https://aws.amazon.com/lambda AWS Lambda> backend for <http://hackage.haskell.org/package/distributed-fork distributed-fork>.++library+ hs-source-dirs: src+ default-language: Haskell2010+ exposed-modules: Control.Distributed.Fork.Lambda+ other-modules: Control.Distributed.Fork.Lambda.Internal.Types+ , Control.Distributed.Fork.Lambda.Internal.Constants+ , Control.Distributed.Fork.Lambda.Internal.Stack+ , Control.Distributed.Fork.Lambda.Internal.Archive+ , Control.Distributed.Fork.Lambda.Internal.Invoke+ , Control.Concurrent.Throttled+ ghc-options: -Wall+ build-depends: base >= 4.7 && < 5+ , distributed-fork+ , SHA+ , aeson+ , aeson-qq+ , amazonka+ , amazonka-cloudformation+ , amazonka-core+ , amazonka-lambda >= 1.6.0+ , amazonka-s3+ , amazonka-sqs+ , async+ , base64-bytestring+ , bytestring+ , containers+ , interpolate+ , lens+ , lens-aeson+ , safe-exceptions+ , stratosphere >= 0.15.0+ , text+ , time+ , typed-process+ , unordered-containers+ , zip-archive++test-suite tests+ type: exitcode-stdio-1.0+ hs-source-dirs: test+ main-is: Test.hs+ default-language: Haskell2010+ ghc-options: -Wall -static -optl-static -optl-pthread -fPIC+ build-depends: base >=4.7 && < 5+ , distributed-fork+ , distributed-fork-aws-lambda+ , tasty+ , tasty-hunit+ , text
+ src/Control/Concurrent/Throttled.hs view
@@ -0,0 +1,30 @@+module Control.Concurrent.Throttled+ ( Throttle+ , newThrottle+ , throttled+ ) where++--------------------------------------------------------------------------------+import Control.Monad+import Control.Exception+import Control.Concurrent+--------------------------------------------------------------------------------++newtype Throttle+ = Throttle (MVar (MVar ()))++newThrottle :: Int -> IO Throttle+newThrottle maxConcurrent = do+ mv <- newEmptyMVar+ forM_ [1..maxConcurrent] $ \_ -> forkIO . forever $ do+ m <- takeMVar mv+ putMVar m ()+ putMVar m ()+ return $ Throttle mv++throttled :: Throttle -> IO a -> IO a+throttled (Throttle mv) act = do+ m <- newEmptyMVar+ putMVar mv m+ readMVar m+ act `finally` takeMVar m
+ src/Control/Distributed/Fork/Lambda.hs view
@@ -0,0 +1,167 @@+{-# LANGUAGE OverloadedStrings #-}+{-# LANGUAGE RecordWildCards #-}++-- |+-- Provides a 'Backend' using AWS Lambda functions.+--+-- In order to do that, roughly:+--+-- * It creates a deployment archive containing the program binary and+-- a tiny wrapper written in Python and uploads it to the given S3 bucket.+-- * Creates a CloudFormation stack containing the Lambda function and+-- an SQS queue to gather the answers.+-- * It starts polling the SQS queue for any answers.+-- * When executing, it invokes the Lambda function using asynchronous+-- invocation mode and blocks until a message appears in the queue.+-- * On exit, it deletes the CloudFormation stack.+--+-- Some warts:+--+-- * The same binary should run on AWS Lambda. In practice, this means:+--+-- * You have to build and use this library on a Linux machine.+--+-- * You have to statically link everything. You can use GHC's+-- '@-static -optl-static -optl-pthread -fPIC@' parameters for that.+-- See <https://github.com/utdemir/serverless-batch/blob/master/examples/examples.cabal examples/examples.cabal#L16>+-- for an example.+--+-- * On AWS Lambda, more memory you assign to a function, more CPU you+-- get. So it might make your function run faster if you overallocate+-- memory.+-- * When invoked asynchronously, AWS Lambda retries the invocation+-- 2 more times waiting a minute between every retry. This means when+-- something fails, it will take at least a few minutes to until you+-- get an exception.++module Control.Distributed.Fork.Lambda+ (+ -- * Usage+ withLambdaBackend+ -- * Options+ , LambdaBackendOptions+ , lambdaBackendOptions+ , lboPrefix+ , lboMemory+ ) where++import Data.Bool (bool)+import Data.Monoid ((<>))+import qualified Data.Text as T+import Data.Time.Clock (getCurrentTime)+import Data.Time.Format (defaultTimeLocale,+ formatTime)+import Control.Lens ((^.), Lens', lens)+import Network.AWS (Credentials (Discover),+ envRegion,+ newEnv,+ runAWS,+ runResourceT)+--------------------------------------------------------------------------------+import Control.Distributed.Fork.Backend+import Control.Distributed.Fork.Lambda.Internal.Archive+import Control.Distributed.Fork.Lambda.Internal.Invoke+import Control.Distributed.Fork.Lambda.Internal.Stack+import Control.Distributed.Fork.Lambda.Internal.Types+--------------------------------------------------------------------------------++-- |+-- Provides a 'Backend' using AWS Lambda functions.+--+-- Created AWS resources except the uploaded deployment package will be cleaned+-- up when exiting.+--+-- Example usage:+--+-- @+-- {-\# LANGUAGE StaticPointers #-}+--+-- import Control.Lens+-- import Control.Distributed.Fork+-- import Control.Distributed.Fork.Lambda+--+-- opts :: LambdaBackendOptions+-- opts = lambdaBackendOptions "my-s3-bucket"+-- & lboMemory .~ 1024+--+-- main :: IO ()+-- main = do+-- 'initServerless'+-- 'withLambdaBackend' opts $ \backend -> do+-- ret <- 'execute' 'backend' (static 'Dict') (static (return "Hello from Lambda!"))+-- putStrLn ret+-- @++withLambdaBackend :: LambdaBackendOptions -> (Backend -> IO a) -> IO a+withLambdaBackend LambdaBackendOptions {..} f = do+ env <- newEnv Discover+ putStrLn $ "Detected region: " <> show (env ^. envRegion) <> "."++ archive <- mkArchive+ let cksum = archiveChecksum archive+ size = fromIntegral (archiveSize archive) / (1000 * 1000) :: Double+ s3loc =+ S3Loc (BucketName _lboBucket) (_lboPrefix <> "-" <> cksum <> ".zip")++ putStrLn "Checking if deployment archive exists."+ runResourceT . runAWS env $+ awsObjectExists s3loc >>=+ bool+ (liftIO (putStrLn $ "Uploading the deployment archive. (" <> show size <> " MB)")+ >> awsUploadObject s3loc (archiveToByteString archive))+ (liftIO $ putStrLn "Found archive, skipping upload.")+++ time <-+ T.pack . formatTime defaultTimeLocale "%Y%m%d%H%M%S" <$> getCurrentTime+ let stackOptions =+ StackOptions { soName = StackName (_lboPrefix <> "-" <> time <> "-" <> cksum)+ , soLambdaMemory = _lboMemory+ , soLambdaCode = s3loc+ }++ putStrLn "Creating stack."+ withStack stackOptions env $ \si -> do+ putStrLn "Stack created."+ putStrLn $ "Artifact: " <> show s3loc+ putStrLn $ "Stack Id: " <> T.unpack (siId si)+ withInvoke env si $ \invoke ->+ f $ Backend invoke++--------------------------------------------------------------------------------++-- |+-- Options required for creating a Lambda backend.+--+-- Use 'lambdaBackendOptions' smart constructor to create and lenses below for+-- setting optional fields.+data LambdaBackendOptions = LambdaBackendOptions+ { _lboBucket :: T.Text+ , _lboPrefix :: T.Text+ , _lboMemory :: Int+ }++lambdaBackendOptions :: T.Text -- ^ Name of the S3 bucket to store the deployment archive in.+ -> LambdaBackendOptions+lambdaBackendOptions bucket =+ LambdaBackendOptions { _lboBucket = bucket+ , _lboPrefix = "distributed-fork"+ , _lboMemory = 128+ }++-- |+-- Desired memory for the Lambda functions.+--+-- See <https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-lambda-function.html#cfn-lambda-function-memorysize CloudFormation's AWS::Lambda::Function::MemorySize page> for allowed values.+--+-- Default: 128+lboMemory :: Lens' LambdaBackendOptions Int+lboMemory = lens _lboMemory (\s t -> s { _lboMemory = t })++-- |+-- Prefix to the deployment archive and the CloudFormation stack.+--+-- Default: "distributed-fork"+lboPrefix :: Lens' LambdaBackendOptions T.Text+lboPrefix = lens _lboPrefix (\s t -> s { _lboPrefix = t })+
+ src/Control/Distributed/Fork/Lambda/Internal/Archive.hs view
@@ -0,0 +1,129 @@+{-# LANGUAGE BinaryLiterals #-}+{-# LANGUAGE OverloadedStrings #-}+{-# LANGUAGE QuasiQuotes #-}++{-+This module contains the executables for the Lambda function.+-}++module Control.Distributed.Fork.Lambda.Internal.Archive+ ( Archive (..)+ , mkArchive+ , archiveSize+ , archiveChecksum+ ) where++--------------------------------------------------------------------------------+import Codec.Archive.Zip hiding+ (Archive)+import Control.Exception+import Control.Monad+import qualified Data.ByteString as BS+import qualified Data.ByteString.Lazy as BL+import Data.Digest.Pure.SHA+import Data.Function+import Data.String.Interpolate+import qualified Data.Text as T+import qualified Data.Text.Encoding as T+import System.Process.Typed+--------------------------------------------------------------------------------+import Control.Distributed.Fork.Backend+import Control.Distributed.Fork.Lambda.Internal.Constants+--------------------------------------------------------------------------------++{-+Since AWS Lambda does not support binary execution by default, our entry point+is a small Python script, whose only purpose is to execute the attached Haskell+binary, provide the input from standard input and return the standard output to+the queue.+-}+handlerPy :: BS.ByteString+handlerPy = T.encodeUtf8 $ T.pack [i|+import os+import subprocess+from base64 import *+import boto3++queue_url = os.environ["#{envAnswerQueueUrl}"]+client = boto3.client('sqs')++def handle(event, context):+ popen = subprocess.Popen(+ ["./#{hsMainName}", "#{argExecutorMode}"],+ stdin=subprocess.PIPE, stdout=subprocess.PIPE)+ (out, _) = popen.communicate(b64decode(event["d"]))+ client.send_message(+ QueueUrl=queue_url,+ MessageBody=b64encode(out),+ MessageAttributes={+ "Id": {+ "DataType": "Number",+ "StringValue": str(event["i"])+ }+ }+ )++|]++{-+And we read the current executable.++Since it'll run on AWS Lambda, it needs to be a statically linked Linux+executable, so we do a preliminary check here. We're calling the "file"+command here instead of using libmagic, because trying to statically compile+it caused problems on my system.+-}+mkHsMain :: IO BS.ByteString+mkHsMain = do+ path <- getExecutablePath+ checkFile path+ BS.readFile path+ where+ checkFile path = do+ ret <-+ liftIO $+ T.splitOn ", " . T.decodeUtf8 . BL.toStrict <$>+ readProcessStdout_ (proc "file" ["--brief", path])+ let preds :: [(T.Text, T.Text)]+ preds =+ [ ( "ELF 64-bit LSB executable"+ , "file is not an 64 bit ELF executable")+ , ( "statically linked"+ , "file is not statically linked"+ )+ ]+ forM_ preds $ \(str, ex) ->+ if str `elem` ret+ then return ()+ else throwIO (FileException ex)+ return ()++newtype FileException+ = FileException T.Text+ deriving Show++instance Exception FileException++{-+And we're going to put all of them in a zip archive.+-}+newtype Archive =+ Archive { archiveToByteString :: BS.ByteString }++mkArchive :: IO Archive+mkArchive = do+ hsMain <- mkHsMain+ return . Archive . BL.toStrict . fromArchive $+ emptyArchive+ & addEntryToArchive+ (toEntry handlerPyName 0 $ BL.fromStrict handlerPy)+ & addEntryToArchive+ (toEntry hsMainName 0 $ BL.fromStrict hsMain)+ { eExternalFileAttributes = 0b10000 {- rwx -} }++archiveSize :: Archive -> Integer+archiveSize = fromIntegral . BS.length . archiveToByteString++archiveChecksum :: Archive -> T.Text+archiveChecksum =+ T.pack . showDigest . sha1 . BL.fromStrict . archiveToByteString
+ src/Control/Distributed/Fork/Lambda/Internal/Constants.hs view
@@ -0,0 +1,16 @@+{-# LANGUAGE OverloadedStrings #-}++module Control.Distributed.Fork.Lambda.Internal.Constants where++--------------------------------------------------------------------------------+import Data.Text (Text)+--------------------------------------------------------------------------------++hsMainName :: String+hsMainName = "hs-main"++handlerPyName :: String+handlerPyName = "handler.py"++envAnswerQueueUrl :: Text+envAnswerQueueUrl = "ANSWER_QUEUE_URL"
+ src/Control/Distributed/Fork/Lambda/Internal/Invoke.hs view
@@ -0,0 +1,196 @@+{-# LANGUAGE OverloadedStrings #-}+{-# LANGUAGE RecordWildCards #-}+{-# LANGUAGE TypeApplications #-}++module Control.Distributed.Fork.Lambda.Internal.Invoke+ ( withInvoke+ ) where++--------------------------------------------------------------------------------+import Control.Concurrent.Async+import Control.Concurrent.MVar+import Control.Exception.Safe+import Control.Lens+import Control.Monad+import qualified Data.Aeson as A+import Data.Aeson.Lens+import qualified Data.ByteString as BS+import qualified Data.ByteString.Lazy as BL+import Data.ByteString.Base64 as B64+import qualified Data.HashMap.Strict as HM+import qualified Data.Map.Strict as M+import Data.Maybe+import Data.Monoid+import qualified Data.Text as T+import qualified Data.Text.Encoding as T+import Network.AWS+import Network.AWS.Lambda+import Network.AWS.SQS+import Text.Read+--------------------------------------------------------------------------------+import Control.Concurrent.Throttled+import Control.Distributed.Fork.Backend+import Control.Distributed.Fork.Lambda.Internal.Stack (StackInfo (..))+--------------------------------------------------------------------------------++{-+Since we're going to get our answers asynchronously, we maintain a state with+callbacks for individual invocations.++Every individual invocation have an incrementing id, so we can distinguish+the responses.+-}+data LambdaState = LambdaState+ { lsInvocations :: M.Map Int (IO BS.ByteString -> IO ())+ , lsNextId :: Int+ }++data LambdaEnv = LambdaEnv+ { leState :: MVar LambdaState+ , leStack :: StackInfo+ , leEnv :: Env+ }++newLambdaEnv :: Env -> StackInfo -> IO LambdaEnv+newLambdaEnv env st =+ LambdaEnv+ <$> newMVar (LambdaState M.empty 0)+ <*> return st+ <*> return env++{-+When invoking a function, we insert a new id to the state and then call Lambda.+-}+execute :: LambdaEnv -> Throttle -> BS.ByteString -> BackendM BS.ByteString+execute LambdaEnv{..} throttle input = do+ -- Modify environment+ mvar <- liftIO $ newEmptyMVar @(IO BS.ByteString)+ id' <- liftIO $ modifyMVar leState $ \LambdaState{..} -> return+ ( LambdaState { lsNextId = lsNextId + 1+ , lsInvocations =+ M.insert lsNextId (void . tryPutMVar mvar) lsInvocations+ }+ , lsNextId+ )++ -- invoke the lambda function+ irs <- liftIO $ throttled throttle . runResourceT . runAWS leEnv $+ send $ invoke+ (siFunc leStack)+ (BL.toStrict . A.encode $ A.object+ [ (T.pack "d", A.toJSON . T.decodeUtf8 $ B64.encode input)+ , (T.pack "i", A.toJSON id')+ ])+ & iInvocationType ?~ Event+ submitted++ unless (irs ^. irsStatusCode `div` 100 == 2) $+ throwIO . InvokeException $+ "Invoke failed. Status code: " <> T.pack (show $ irs ^. irsStatusCode)++ -- wait fo the answer+ liftIO . join $ readMVar mvar+++{-+And then we listen from answerQueue for the responses+-}+answerThread :: LambdaEnv -> IO ()+answerThread LambdaEnv {..} = runResourceT . runAWS leEnv . forever $ do+ msgs <- sqsReceiveSome $ siAnswerQueue leStack+ forM_ msgs $ \msg -> do+ id' <- liftIO $ decodeId msg+ liftIO . modifyMVar_ leState $ \s ->+ case M.updateLookupWithKey (\_ _ -> Nothing) id' (lsInvocations s) of+ (Nothing, _) -> return s+ (Just x, s') -> s { lsInvocations = s' } <$ x (decodeResponse msg)+ where+ decodeId :: Message -> IO Int+ decodeId msg =+ case HM.lookup "Id" (msg ^. mMessageAttributes) of+ Nothing -> throwIO . InvokeException $+ "Error decoding answer: can not find Id: " <> T.pack (show msg)+ Just av -> case readMaybe . T.unpack <$> av ^. mavStringValue of+ Nothing -> throwIO . InvokeException $+ "Error decoding answer: empty Id."+ Just Nothing -> throwIO . InvokeException $+ "Error decoding answer: can not decode Id."+ Just (Just x) -> return x++ decodeResponse :: Message -> IO BS.ByteString+ decodeResponse msg =+ case B64.decode . T.encodeUtf8 <$> msg ^. mBody of+ Nothing -> throwIO . InvokeException $+ "Error decoding answer: no body."+ Just (Left err) -> throwIO . InvokeException $+ "Error decoding answer: " <> T.pack err+ Just (Right x) -> return x++{-+And then we listen from answerQueue for the responses+-}+deadLetterThread :: LambdaEnv -> IO ()+deadLetterThread LambdaEnv {..} = runResourceT . runAWS leEnv . forever $ do+ msgs <- sqsReceiveSome $ siDeadLetterQueue leStack+ forM_ msgs $ \msg -> do+ id' <- liftIO $ decodeId msg+ liftIO . modifyMVar_ leState $ \s ->+ case M.updateLookupWithKey (\_ _ -> Nothing) id' (lsInvocations s) of+ (Nothing, _) -> return s+ (Just x, s') -> s { lsInvocations = s' } <$ x failure+ where+ failure :: IO a+ failure = throwIO . InvokeException $ "Lambda function failed."++ decodeId :: Message -> IO Int+ decodeId msg = case msg ^? mBody . _Just . key "i" . _Number of+ Nothing -> throwIO . InvokeException $+ "Can not find Id: " <> T.pack (show msg)+ Just x -> return $ truncate x++{-+A helper function to read from SQS queues.+-}+sqsReceiveSome :: T.Text -> AWS [Message]+sqsReceiveSome queue = do+ rmrs <- send $+ receiveMessage queue+ & rmVisibilityTimeout ?~ 10+ & rmWaitTimeSeconds ?~ 10+ & rmMaxNumberOfMessages ?~ 10+ & rmMessageAttributeNames .~ ["Id"]+ unless (rmrs ^. rmrsResponseStatus == 200) $+ liftIO . throwIO . InvokeException $+ "Error receiving messages: " <> T.pack (show $ rmrs ^. rmrsResponseStatus)+ let msgs = rmrs ^. rmrsMessages+ unless (null msgs) $ do+ dmbrs <- send $ deleteMessageBatch queue+ & dmbEntries .~+ [ deleteMessageBatchRequestEntry+ (T.pack $ show i)+ (fromJust $ msg ^. mReceiptHandle)+ | (i, msg) <- zip [(0::Integer)..] msgs+ ]+ unless (dmbrs ^. dmbrsResponseStatus == 200) $+ liftIO . throwIO . InvokeException $+ "Error deleting received messages: " <> T.pack (show $ rmrs ^. rmrsResponseStatus)+ return msgs++--------------------------------------------------------------------------------++withInvoke :: Env -> StackInfo -> ((BS.ByteString -> BackendM BS.ByteString) -> IO a) -> IO a+withInvoke env stack f = do+ le <- newLambdaEnv env stack+ throttle <- newThrottle 128+ let answerT = async $ catchAny (answerThread le) $ \ex -> print ex+ deadLetterT = async $ catchAny (deadLetterThread le) $ \ex -> print ex+ void . sequence $ replicate 4 answerT ++ replicate 2 deadLetterT+ f $ execute le throttle++--------------------------------------------------------------------------------++newtype InvokeException+ = InvokeException T.Text+ deriving Show++instance Exception InvokeException
+ src/Control/Distributed/Fork/Lambda/Internal/Stack.hs view
@@ -0,0 +1,308 @@+{-# LANGUAGE NamedFieldPuns #-}+{-# LANGUAGE RecordWildCards #-}+{-# LANGUAGE FlexibleContexts #-}+{-# LANGUAGE LambdaCase #-}+{-# LANGUAGE OverloadedStrings #-}+{-# LANGUAGE QuasiQuotes #-}++{-+This module creates an environment for the Lambda function.+-}++module Control.Distributed.Fork.Lambda.Internal.Stack+ ( withStack+ , StackInfo (..)+ , awsUploadObject+ , awsObjectExists+ ) where++--------------------------------------------------------------------------------+import Control.Exception.Safe+import Control.Monad+import Data.Aeson (Value (Object))+import qualified Data.ByteString as BS+import qualified Data.ByteString.Lazy as BL+import qualified Data.HashMap.Strict as HM+import Data.List+import Data.Maybe+import Data.Monoid+import qualified Data.Text as T+import qualified Data.Text.Encoding as T+import Control.Lens+import Network.AWS hiding (environment)+import Network.AWS.Lambda+import qualified Network.AWS.S3 as S3+import Network.AWS.Waiter+import qualified Stratosphere as S+import Data.Aeson.QQ+import Network.AWS.CloudFormation+--------------------------------------------------------------------------------+import Control.Distributed.Fork.Lambda.Internal.Constants+import Control.Distributed.Fork.Lambda.Internal.Types+--------------------------------------------------------------------------------++{-+Our infrastructure in AWS Lambda looks like this.++We're using CloudFormation to create all the necessary services declaratively+and delete all of them by deleting the stack.++The components are:++* The lambda function.++* A role for the function:++ Lambda functions need to have a role attached. Currently we are both too+ lax (we're not restricting the sqs:SendMessage permission to relevant topics)+ and too strict (we're not letting user to provide a custom policy). This part+ is probably the first one to change.++* Two queues called answerQueue and deadLetterQueue++ Lambda functins have two ways to invoke them on-demand, synchronously and+ asynchronously. Using the synchronous invocation is simpler, you call the API+ and it returns the result. However it requires the HTTP connection to be open+ for the whole time. This puts a hard-cap on the scalability since the driver+ can only have so many open HTTP connections simultaneously.++ To mitigate this, we're going to use asynchronous invocation type, but use+ an SQS queue (answerQueue) to gather the results. We use another queue+ (deadLetterQueue) for collecting the failures.+-}+seTemplate :: StackOptions -> S.Template+seTemplate StackOptions{..} =+ S.template+ (S.Resources+ [ S.resource "func" $+ S.LambdaFunctionProperties $+ S.lambdaFunction+ (S.lambdaFunctionCode+ & S.lfcS3Bucket ?~ S.Ref templateParameterS3Bucket+ & S.lfcS3Key ?~ S.Ref templateParameterS3Key)+ "handler.handle"+ (S.GetAtt "role" "Arn")+ (S.Literal S.Python27)+ & S.lfTimeout ?~ S.Literal 300+ & S.lfMemorySize ?~ S.Literal (fromIntegral soLambdaMemory)+ & S.lfDeadLetterConfig ?~+ S.LambdaFunctionDeadLetterConfig (Just $ S.GetAtt "deadLetterQueue" "Arn")+ , S.resource "role" seRole+ , S.resource "answerQueue" $ S.SQSQueueProperties S.sqsQueue+ , S.resource "deadLetterQueue" $ S.SQSQueueProperties S.sqsQueue+ ]) &+ S.templateParameters ?~+ S.Parameters+ [ S.parameter templateParameterS3Bucket "String"+ , S.parameter templateParameterS3Key "String"+ ] &+ S.templateOutputs ?~+ S.Outputs+ [ S.output templateOutputFunc (S.Ref "func")+ , S.output templateOutputAnswerQueue (S.Ref "answerQueue")+ , S.output templateOutputDeadLetterQueue (S.Ref "deadLetterQueue")+ ]++seRole :: S.ResourceProperties+seRole =+ S.IAMRoleProperties $+ S.iamRole assumeRolePolicy+ & S.iamrPolicies ?~+ [ S.iamRolePolicy sqsAccessPolicy (S.Literal "sqs")+ , S.iamRolePolicy cloudwatchPolicy (S.Literal "cloudwatch")+ ]+ where+ assumeRolePolicy = valueToObject [aesonQQ|+ {+ "Version":"2012-10-17",+ "Statement": [{+ "Effect": "Allow",+ "Principal": {+ "Service": [ "lambda.amazonaws.com" ]+ },+ "Action": [ "sts:AssumeRole" ]+ }]+ }+ |]+ sqsAccessPolicy = valueToObject [aesonQQ|+ {+ "Version": "2012-10-17",+ "Statement": [{+ "Effect": "Allow",+ "Action": [+ "sqs:SendMessage"+ ],+ "Resource": "arn:aws:sqs:*"+ }]+ }+ |]+ cloudwatchPolicy = valueToObject [aesonQQ|+ {+ "Version": "2012-10-17",+ "Statement": [{+ "Action": [+ "logs:CreateLogGroup",+ "logs:CreateLogStream",+ "logs:PutLogEvents"+ ],+ "Effect": "Allow",+ "Resource": "arn:aws:logs:*:*:*"+ }]+ }+ |]+ valueToObject = \case+ Object hm -> hm+ _ -> error "invariant violation"+++templateParameterS3Bucket :: T.Text+templateParameterS3Bucket = "s3bucket"++templateParameterS3Key :: T.Text+templateParameterS3Key = "s3key"++templateOutputFunc :: T.Text+templateOutputFunc = "output"++templateOutputAnswerQueue :: T.Text+templateOutputAnswerQueue = "answerQueue"++templateOutputDeadLetterQueue :: T.Text+templateOutputDeadLetterQueue = "deadLetterQueue"++--------------------------------------------------------------------------------++{-+Before creating a stack, we need to upload the artifact to S3.+-}+awsUploadObject :: S3Loc -> BS.ByteString -> AWS ()+awsUploadObject (S3Loc (BucketName bucket) path) contents = do+ pors <- send $ S3.putObject+ (S3.BucketName bucket)+ (S3.ObjectKey path)+ (toBody contents)+ unless (pors ^. S3.porsResponseStatus == 200) $+ throwM . StackException $+ "Upload failed. Status code: " <> T.pack (show $ pors ^. S3.porsResponseStatus)++awsObjectExists :: S3Loc -> AWS Bool+awsObjectExists (S3Loc (BucketName bucket) path) = do+ lors <- send $+ S3.listObjects (S3.BucketName bucket)+ & S3.loPrefix ?~ path+ unless (lors ^. S3.lorsResponseStatus == 200) $+ throwM . StackException $+ "List objects failed. Status code: " <> T.pack (show lors)+ let files = map (view S3.oKey) (lors ^. S3.lorsContents)+ return $ any (\(S3.ObjectKey k) -> k == path) files++--------------------------------------------------------------------------------++{-+Here we are actually creating the stack.++Tricky part is that, since our lambda function publish to answerQueue, it needs+to know the URL for it. However LambdaFunctionEnvironment in CloudFormation does+not support referring to stack variables inside, so we need to patch the function+afterwards to add the URL to the environment+-}+data StackInfo = StackInfo+ { siId :: T.Text+ , siFunc :: T.Text+ , siAnswerQueue :: T.Text+ , siDeadLetterQueue :: T.Text+ }++seCreateStack :: StackOptions -> AWS StackInfo+seCreateStack options@StackOptions { soName = StackName stackName+ , soLambdaCode = S3Loc (BucketName bucketName) path} = do+ csrs <-+ send $+ createStack stackName+ & csTemplateBody ?~+ (T.decodeUtf8 . BL.toStrict . S.encodeTemplate $ seTemplate options)+ & csCapabilities .~ [CapabilityIAM]+ & csParameters .~+ [ parameter+ & pParameterKey ?~ templateParameterS3Bucket+ & pParameterValue ?~ bucketName+ , parameter+ & pParameterKey ?~ templateParameterS3Key+ & pParameterValue ?~ path+ ]+ unless (csrs ^. csrsResponseStatus == 200) $+ throwM $+ StackException+ ("CloudFormation stack creation request failed." <> T.pack (show csrs))+ stackId <-+ case csrs ^. csrsStackId of+ Nothing ->+ throwM $+ StackException+ "Could not determine stack id."+ Just xs -> return xs++ await stackCreateComplete (describeStacks & dStackName ?~ stackId) >>= \case+ AcceptSuccess -> return ()+ err ->+ throwM . StackException $ "CloudFormation stack creation failed." <> T.pack (show err)++ dsrs <- send $ describeStacks & dStackName ?~ stackName+ unless (dsrs ^. dsrsResponseStatus == 200) $+ throwM . StackException $+ "CloudFormation describeStack failed. Status code: "+ <> T.pack (show $ dsrs ^. dsrsResponseStatus)+ stackRs <- case dsrs ^. dsrsStacks of+ [x] -> return x+ _ -> throwM $ StackException "Unexpected answer from DescribeStacks."++ func <- case lookupOutput stackRs templateOutputFunc of+ Nothing -> throwM $ StackException "Could not determine function name."+ Just t -> return t++ answerQueue <- case lookupOutput stackRs templateOutputAnswerQueue of+ Nothing -> throwM $ StackException "Could not determine answerQueue URL."+ Just t -> return t++ deadLetterQueue <- case lookupOutput stackRs templateOutputDeadLetterQueue of+ Nothing -> throwM $ StackException "Could not determine deadLetterQueue URL."+ Just t -> return t++ _ <- send $+ updateFunctionConfiguration func+ & ufcEnvironment ?~ (+ environment+ & eVariables ?~ HM.fromList [ (envAnswerQueueUrl, answerQueue) ]+ )++ return $ StackInfo { siId = stackId+ , siFunc = func+ , siAnswerQueue = answerQueue+ , siDeadLetterQueue = deadLetterQueue+ }++ where+ lookupOutput :: Stack -> T.Text -> Maybe T.Text+ lookupOutput st key =+ fmap (\i -> fromJust $ i ^. oOutputValue) .+ find (\o -> o ^. oOutputKey == Just key) $+ st ^. sOutputs++seDeleteStack :: StackInfo -> AWS ()+seDeleteStack = void . send . deleteStack . siId++--------------------------------------------------------------------------------++newtype StackException+ = StackException T.Text+ deriving Show++instance Exception StackException++--------------------------------------------------------------------------------++withStack :: StackOptions -> Env -> (StackInfo -> IO a) -> IO a+withStack opts env = bracket create destroy+ where+ create = runResourceT . runAWS env $ seCreateStack opts+ destroy = runResourceT . runAWS env . seDeleteStack
+ src/Control/Distributed/Fork/Lambda/Internal/Types.hs view
@@ -0,0 +1,20 @@+module Control.Distributed.Fork.Lambda.Internal.Types where++--------------------------------------------------------------------------------+import Data.Text (Text)+--------------------------------------------------------------------------------++newtype BucketName = BucketName Text+ deriving (Eq, Show)++data S3Loc = S3Loc BucketName Text+ deriving (Eq, Show)++newtype StackName = StackName { unStackName :: Text }+ deriving (Eq, Show)++data StackOptions =+ StackOptions { soName :: StackName+ , soLambdaMemory :: Int+ , soLambdaCode :: S3Loc+ }
+ test/Test.hs view
@@ -0,0 +1,56 @@+{-# LANGUAGE LambdaCase #-}+{-# LANGUAGE OverloadedStrings #-}+{-# LANGUAGE StaticPointers #-}+{-# LANGUAGE TypeApplications #-}++module Main where++--------------------------------------------------------------------------------+import Control.Concurrent+import Control.Exception (try)+import Data.Monoid ((<>))+import qualified Data.Text as T+import System.Environment+import Test.Tasty+import Test.Tasty.HUnit+--------------------------------------------------------------------------------+import Control.Distributed.Fork+import Control.Distributed.Fork.Lambda+--------------------------------------------------------------------------------++main :: IO ()+main = do+ initDistributedFork+ tests_ <- lookupEnv "ENABLE_AWS_TESTS" >>= \case+ Nothing -> do+ putStrLn "ENV[ENABLE_AWS_TESTS] is not set, skipping."+ return $ testGroup "No tests" []+ Just _ -> return tests+ defaultMain tests_++opts :: LambdaBackendOptions+opts = lambdaBackendOptions "serverless-batch"++tests :: TestTree+tests =+ testGroup+ "Tests"+ [ testCase "creates backend" $ do+ withLambdaBackend opts $ \_ -> do+ threadDelay $ 5*1000*1000+ return ()+ , testCase "runs the function" $ do+ r <-+ withLambdaBackend opts $ \backend ->+ fork backend (static Dict) (static (return $ Just @Integer 42))+ >>= await+ r @?= Just 42+ , testCase "handles oom" $ do+ r <-+ try $ withLambdaBackend opts $ \backend ->+ fork backend (static Dict) (static (return $ T.replicate (2^32) "h"))+ >>= await+ r @?= Left (ExecutorFailedException $+ "Backend threw an exception: InvokeException " <>+ "\"Lambda function failed.\"")+ ]