curl-mock cookbook example
This commit is contained in:
Jakob Demler
parent
e066fbe493
commit
765b62b05b
16
.travis.yml
16
.travis.yml
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@ -66,11 +66,11 @@ install:
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- rm -fv cabal.project cabal.project.local
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- "if [ $HCNUMVER -ge 70800 ]; then sed -i.bak 's/-- ghc-options:.*/ghc-options: -j2/' ${HOME}/.cabal/config; fi"
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- grep -Ev -- '^\s*--' ${HOME}/.cabal/config | grep -Ev '^\s*$'
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- "printf 'packages: \"servant\" \"servant-client\" \"servant-client-core\" \"servant-docs\" \"servant-foreign\" \"servant-server\" \"doc/tutorial\" \"doc/cookbook/basic-auth\" \"doc/cookbook/db-postgres-pool\" \"doc/cookbook/db-sqlite-simple\" \"doc/cookbook/file-upload\" \"doc/cookbook/generic\" \"doc/cookbook/https\" \"doc/cookbook/jwt-and-basic-auth\" \"doc/cookbook/pagination\" \"doc/cookbook/structuring-apis\" \"doc/cookbook/using-custom-monad\" \"doc/cookbook/using-free-client\"\\n' > cabal.project"
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- "printf 'packages: \"servant\" \"servant-client\" \"servant-client-core\" \"servant-docs\" \"servant-foreign\" \"servant-server\" \"doc/tutorial\" \"doc/cookbook/basic-auth\" \"doc/cookbook/curl-mock\" \"doc/cookbook/db-postgres-pool\" \"doc/cookbook/db-sqlite-simple\" \"doc/cookbook/file-upload\" \"doc/cookbook/generic\" \"doc/cookbook/https\" \"doc/cookbook/jwt-and-basic-auth\" \"doc/cookbook/pagination\" \"doc/cookbook/structuring-apis\" \"doc/cookbook/using-custom-monad\" \"doc/cookbook/using-free-client\"\\n' > cabal.project"
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- "echo 'constraints: foundation >=0.0.14,memory <0.14.12 || >0.14.12' >> cabal.project"
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- "echo 'allow-newer: servant-auth-server:http-types,servant-auth-server:servant-server, servant-pagination:servant,servant-pagination:servant-server' >> cabal.project"
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- touch cabal.project.local
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- "if ! $NOINSTALLEDCONSTRAINTS; then for pkg in $($HCPKG list --simple-output); do echo $pkg | grep -vw -- servant | grep -vw -- servant-client | grep -vw -- servant-client-core | grep -vw -- servant-docs | grep -vw -- servant-foreign | grep -vw -- servant-server | grep -vw -- tutorial | grep -vw -- cookbook-basic-auth | grep -vw -- cookbook-db-postgres-pool | grep -vw -- cookbook-db-sqlite-simple | grep -vw -- cookbook-file-upload | grep -vw -- cookbook-generic | grep -vw -- cookbook-https | grep -vw -- cookbook-jwt-and-basic-auth | grep -vw -- cookbook-pagination | grep -vw -- cookbook-structuring-apis | grep -vw -- cookbook-using-custom-monad | grep -vw -- cookbook-using-free-client | sed 's/^/constraints: /' | sed 's/-[^-]*$/ installed/' >> cabal.project.local; done; fi"
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- "if ! $NOINSTALLEDCONSTRAINTS; then for pkg in $($HCPKG list --simple-output); do echo $pkg | grep -vw -- servant | grep -vw -- servant-client | grep -vw -- servant-client-core | grep -vw -- servant-docs | grep -vw -- servant-foreign | grep -vw -- servant-server | grep -vw -- tutorial | grep -vw -- cookbook-basic-auth | grep -vw -- cookbook-curl-mock | grep -vw -- cookbook-db-postgres-pool | grep -vw -- cookbook-db-sqlite-simple | grep -vw -- cookbook-file-upload | grep -vw -- cookbook-generic | grep -vw -- cookbook-https | grep -vw -- cookbook-jwt-and-basic-auth | grep -vw -- cookbook-pagination | grep -vw -- cookbook-structuring-apis | grep -vw -- cookbook-using-custom-monad | grep -vw -- cookbook-using-free-client | sed 's/^/constraints: /' | sed 's/-[^-]*$/ installed/' >> cabal.project.local; done; fi"
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- cat cabal.project || true
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- cat cabal.project.local || true
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- if [ -f "servant/configure.ac" ]; then
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@ -97,6 +97,9 @@ install:
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- if [ -f "doc/cookbook/basic-auth/configure.ac" ]; then
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(cd "doc/cookbook/basic-auth" && autoreconf -i);
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fi
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- if [ -f "doc/cookbook/curl-mock/configure.ac" ]; then
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(cd "doc/cookbook/curl-mock" && autoreconf -i);
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fi
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- if [ -f "doc/cookbook/db-postgres-pool/configure.ac" ]; then
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(cd "doc/cookbook/db-postgres-pool" && autoreconf -i);
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fi
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@ -128,7 +131,7 @@ install:
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(cd "doc/cookbook/using-free-client" && autoreconf -i);
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fi
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- rm -f cabal.project.freeze
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- rm -rf .ghc.environment.* "servant"/dist "servant-client"/dist "servant-client-core"/dist "servant-docs"/dist "servant-foreign"/dist "servant-server"/dist "doc/tutorial"/dist "doc/cookbook/basic-auth"/dist "doc/cookbook/db-postgres-pool"/dist "doc/cookbook/db-sqlite-simple"/dist "doc/cookbook/file-upload"/dist "doc/cookbook/generic"/dist "doc/cookbook/https"/dist "doc/cookbook/jwt-and-basic-auth"/dist "doc/cookbook/pagination"/dist "doc/cookbook/structuring-apis"/dist "doc/cookbook/using-custom-monad"/dist "doc/cookbook/using-free-client"/dist
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- rm -rf .ghc.environment.* "servant"/dist "servant-client"/dist "servant-client-core"/dist "servant-docs"/dist "servant-foreign"/dist "servant-server"/dist "doc/tutorial"/dist "doc/cookbook/curl-mock"/dist "doc/cookbook/basic-auth"/dist "doc/cookbook/curl-mock"/dist "doc/cookbook/db-postgres-pool"/dist "doc/cookbook/db-sqlite-simple"/dist "doc/cookbook/file-upload"/dist "doc/cookbook/generic"/dist "doc/cookbook/https"/dist "doc/cookbook/jwt-and-basic-auth"/dist "doc/cookbook/pagination"/dist "doc/cookbook/structuring-apis"/dist "doc/cookbook/using-custom-monad"/dist "doc/cookbook/using-free-client"/dist
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- DISTDIR=$(mktemp -d /tmp/dist-test.XXXX)
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# Here starts the actual work to be performed for the package under test;
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@ -144,6 +147,7 @@ script:
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- (cd "servant-server" && cabal sdist)
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- (cd "doc/tutorial" && cabal sdist)
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- (cd "doc/cookbook/basic-auth" && cabal sdist)
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- (cd "doc/cookbook/curl-mock" && cabal sdist)
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- (cd "doc/cookbook/db-postgres-pool" && cabal sdist)
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- (cd "doc/cookbook/db-sqlite-simple" && cabal sdist)
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- (cd "doc/cookbook/file-upload" && cabal sdist)
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@ -156,14 +160,14 @@ script:
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- (cd "doc/cookbook/using-free-client" && cabal sdist)
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- echo -en 'travis_fold:end:sdist\\r'
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- echo Unpacking... && echo -en 'travis_fold:start:unpack\\r'
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- mv "servant"/dist/servant-*.tar.gz "servant-client"/dist/servant-client-*.tar.gz "servant-client-core"/dist/servant-client-core-*.tar.gz "servant-docs"/dist/servant-docs-*.tar.gz "servant-foreign"/dist/servant-foreign-*.tar.gz "servant-server"/dist/servant-server-*.tar.gz "doc/tutorial"/dist/tutorial-*.tar.gz "doc/cookbook/basic-auth"/dist/cookbook-basic-auth-*.tar.gz "doc/cookbook/db-postgres-pool"/dist/cookbook-db-postgres-pool-*.tar.gz "doc/cookbook/db-sqlite-simple"/dist/cookbook-db-sqlite-simple-*.tar.gz "doc/cookbook/file-upload"/dist/cookbook-file-upload-*.tar.gz "doc/cookbook/generic"/dist/cookbook-generic-*.tar.gz "doc/cookbook/https"/dist/cookbook-https-*.tar.gz "doc/cookbook/jwt-and-basic-auth"/dist/cookbook-jwt-and-basic-auth-*.tar.gz "doc/cookbook/pagination"/dist/cookbook-pagination-*.tar.gz "doc/cookbook/structuring-apis"/dist/cookbook-structuring-apis-*.tar.gz "doc/cookbook/using-custom-monad"/dist/cookbook-using-custom-monad-*.tar.gz "doc/cookbook/using-free-client"/dist/cookbook-using-free-client-*.tar.gz ${DISTDIR}/
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- mv "servant"/dist/servant-*.tar.gz "servant-client"/dist/servant-client-*.tar.gz "servant-client-core"/dist/servant-client-core-*.tar.gz "servant-docs"/dist/servant-docs-*.tar.gz "servant-foreign"/dist/servant-foreign-*.tar.gz "servant-server"/dist/servant-server-*.tar.gz "doc/tutorial"/dist/tutorial-*.tar.gz "doc/cookbook/basic-auth"/dist/cookbook-basic-auth-*.tar.gz "doc/cookbook/curl-mock"/dist/cookbook-curl-mock-*.tar.gz "doc/cookbook/db-postgres-pool"/dist/cookbook-db-postgres-pool-*.tar.gz "doc/cookbook/db-sqlite-simple"/dist/cookbook-db-sqlite-simple-*.tar.gz "doc/cookbook/file-upload"/dist/cookbook-file-upload-*.tar.gz "doc/cookbook/generic"/dist/cookbook-generic-*.tar.gz "doc/cookbook/https"/dist/cookbook-https-*.tar.gz "doc/cookbook/jwt-and-basic-auth"/dist/cookbook-jwt-and-basic-auth-*.tar.gz "doc/cookbook/pagination"/dist/cookbook-pagination-*.tar.gz "doc/cookbook/structuring-apis"/dist/cookbook-structuring-apis-*.tar.gz "doc/cookbook/using-custom-monad"/dist/cookbook-using-custom-monad-*.tar.gz "doc/cookbook/using-free-client"/dist/cookbook-using-free-client-*.tar.gz ${DISTDIR}/
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- cd ${DISTDIR} || false
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- find . -maxdepth 1 -name '*.tar.gz' -exec tar -xvf '{}' \;
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- "printf 'packages: servant-*/*.cabal servant-client-*/*.cabal servant-client-core-*/*.cabal servant-docs-*/*.cabal servant-foreign-*/*.cabal servant-server-*/*.cabal tutorial-*/*.cabal cookbook-basic-auth-*/*.cabal cookbook-db-postgres-pool-*/*.cabal cookbook-db-sqlite-simple-*/*.cabal cookbook-file-upload-*/*.cabal cookbook-generic-*/*.cabal cookbook-https-*/*.cabal cookbook-jwt-and-basic-auth-*/*.cabal cookbook-pagination-*/*.cabal cookbook-structuring-apis-*/*.cabal cookbook-using-custom-monad-*/*.cabal cookbook-using-free-client-*/*.cabal\\n' > cabal.project"
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- "printf 'packages: servant-*/*.cabal servant-client-*/*.cabal servant-client-core-*/*.cabal servant-docs-*/*.cabal servant-foreign-*/*.cabal servant-server-*/*.cabal tutorial-*/*.cabal cookbook-basic-auth-*/*.cabal cookbook-curl-mock-*/*.cabal cookbook-db-postgres-pool-*/*.cabal cookbook-db-sqlite-simple-*/*.cabal cookbook-file-upload-*/*.cabal cookbook-generic-*/*.cabal cookbook-https-*/*.cabal cookbook-jwt-and-basic-auth-*/*.cabal cookbook-pagination-*/*.cabal cookbook-structuring-apis-*/*.cabal cookbook-using-custom-monad-*/*.cabal cookbook-using-free-client-*/*.cabal\\n' > cabal.project"
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- "echo 'constraints: foundation >=0.0.14,memory <0.14.12 || >0.14.12' >> cabal.project"
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- "echo 'allow-newer: servant-auth-server:http-types,servant-auth-server:servant-server, servant-pagination:servant,servant-pagination:servant-server' >> cabal.project"
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- touch cabal.project.local
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- "if ! $NOINSTALLEDCONSTRAINTS; then for pkg in $($HCPKG list --simple-output); do echo $pkg | grep -vw -- servant | grep -vw -- servant-client | grep -vw -- servant-client-core | grep -vw -- servant-docs | grep -vw -- servant-foreign | grep -vw -- servant-server | grep -vw -- tutorial | grep -vw -- cookbook-basic-auth | grep -vw -- cookbook-db-postgres-pool | grep -vw -- cookbook-db-sqlite-simple | grep -vw -- cookbook-file-upload | grep -vw -- cookbook-generic | grep -vw -- cookbook-https | grep -vw -- cookbook-jwt-and-basic-auth | grep -vw -- cookbook-pagination | grep -vw -- cookbook-structuring-apis | grep -vw -- cookbook-using-custom-monad | grep -vw -- cookbook-using-free-client | sed 's/^/constraints: /' | sed 's/-[^-]*$/ installed/' >> cabal.project.local; done; fi"
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- "if ! $NOINSTALLEDCONSTRAINTS; then for pkg in $($HCPKG list --simple-output); do echo $pkg | grep -vw -- servant | grep -vw -- servant-client | grep -vw -- servant-client-core | grep -vw -- servant-docs | grep -vw -- servant-foreign | grep -vw -- servant-server | grep -vw -- tutorial | grep -vw -- cookbook-basic-auth | grep -vw -- cookbook-curl-mock | grep -vw -- cookbook-db-postgres-pool | grep -vw -- cookbook-db-sqlite-simple | grep -vw -- cookbook-file-upload | grep -vw -- cookbook-generic | grep -vw -- cookbook-https | grep -vw -- cookbook-jwt-and-basic-auth | grep -vw -- cookbook-pagination | grep -vw -- cookbook-structuring-apis | grep -vw -- cookbook-using-custom-monad | grep -vw -- cookbook-using-free-client | sed 's/^/constraints: /' | sed 's/-[^-]*$/ installed/' >> cabal.project.local; done; fi"
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- cat cabal.project || true
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- cat cabal.project.local || true
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- echo -en 'travis_fold:end:unpack\\r'
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@ -9,6 +9,7 @@ packages: servant/
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-- doc/cookbook/*/*.cabal
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doc/cookbook/basic-auth
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doc/cookbook/curl-mock
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doc/cookbook/db-postgres-pool
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doc/cookbook/db-sqlite-simple
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doc/cookbook/file-upload
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@ -1,5 +1,6 @@
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packages:
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basic-auth/
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curl-mock/
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db-sqlite-simple/
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db-postgres-pool/
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using-custom-monad/
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@ -0,0 +1,218 @@
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# Generating mock curl calls
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In this example we will generate curl requests with mock post data from a servant API.
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This may be usefull for testing and development purposes.
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Especially post requests with a request body are tedious to send manually.
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Also, we will learn how to use the servant-forein library to generate stuff from servant APIs.
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Language extensions and imports:
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``` haskell
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{-# LANGUAGE DataKinds #-}
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{-# LANGUAGE DeriveGeneric #-}
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{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE FlexibleInstances #-}
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{-# LANGUAGE GeneralizedNewtypeDeriving #-}
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{-# LANGUAGE MultiParamTypeClasses #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE RankNTypes #-}
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{-# LANGUAGE RecordWildCards #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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{-# LANGUAGE TypeOperators #-}
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import Control.Lens ((^.))
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import Data.Aeson.Compat
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import Data.Aeson.Text
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import Data.Monoid ((<>))
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import Data.Proxy (Proxy (Proxy))
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import Data.Text (Text)
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import Data.Text.Encoding (decodeUtf8)
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import qualified Data.Text.IO as T.IO
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import qualified Data.Text.Lazy as LazyT
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import GHC.Generics
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import Servant ((:<|>), (:>), Get, JSON,
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Post, ReqBody)
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import Servant.Foreign (Foreign, GenerateList,
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HasForeign, HasForeignType, Req,
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Segment, SegmentType (Cap, Static),
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argName, listFromAPI, path,
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reqBody, reqMethod, reqUrl, typeFor,
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unPathSegment, unSegment,)
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import Test.QuickCheck.Arbitrary
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import Test.QuickCheck.Arbitrary.Generic
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import Test.QuickCheck.Gen (generate)
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import qualified Data.Text as T
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```
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Let's define our API:
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``` haskell
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type UserAPI = "users" :> Get '[JSON] [User]
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:<|> "new" :> "user" :> ReqBody '[JSON] User :> Post '[JSON] ()
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data User = User
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{ name :: String
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, age :: Int
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, email :: String
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} deriving (Eq, Show, Generic)
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instance Arbitrary User where
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arbitrary = genericArbitrary
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shrink = genericShrink
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instance ToJSON User
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instance FromJSON User
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```
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Notice the `Arbitrary User` instance which we will later need to create mock data.
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Also, the obligatory servant boilerplate:
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``` haskell
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api :: Proxy UserAPI
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api = Proxy
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```
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## servant-forgein and the HasForeignType Class
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Servant-foreign allows us to look into the API we designed.
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The entry point is `listFromAPI` which takes three types and returns a list of endpoints:
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``` haskell ignore
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listFromAPI :: (HasForeign lang ftype api, GenerateList ftype (Foreign ftype api)) => Proxy lang -> Proxy ftype -> Proxy api -> [Req ftype]
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```
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This looks a bit confusing...
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[Here](https://hackage.haskell.org/package/servant-foreign-0.11.1/docs/Servant-Foreign.html#t:HasForeignType) is the documentation for the `HasForeign` typeclass.
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We will not go into details here, but this allows us to create a value of type `ftype` for any type `a` in our API.
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In our case we want to create a mock of every type `a`.
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We create a new datatype that holds our mocked value. Well, not the mocked value itself. To mock it we need IO (random). So the promise of a mocked value after some IO is performed:
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``` haskell
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data NoLang
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data Mocked = Mocked (IO Text)
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```
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Now, we create an instance of `HasForeignType` for `NoLang` and `Mocked` for every `a` that implements `ToJSON` and `Arbitrary`:
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``` haskell
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instance (ToJSON a, Arbitrary a) => HasForeignType NoLang Mocked a where
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typeFor _ _ _ =
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Mocked (genText (Proxy :: Proxy a))
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```
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What does `genText` do? It generates an arbitrary value of type `a` and encodes it as text. (And does some lazy to non-lazy text transformation we do not care about):
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``` haskell
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genText :: (ToJSON a, Arbitrary a) => Proxy a -> IO Text
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genText p =
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fmap (\v -> LazyT.toStrict $ encodeToLazyText v) (genArb p)
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genArb :: Arbitrary a => Proxy a -> IO a
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genArb _ =
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generate arbitrary
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```
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### Generating curl calls for every endpoint
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Everything is prepared now and we can start generating some curl calls.
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``` haskell
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generateCurl :: (GenerateList Mocked (Foreign Mocked api), HasForeign NoLang Mocked api)
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=> Proxy api
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-> Text
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-> IO Text
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generateCurl p host =
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fmap T.unlines body
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where
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body = foldr (\endp curlCalls -> mCons (generateEndpoint host endp) curlCalls) (return [])
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$ listFromAPI (Proxy :: Proxy NoLang) (Proxy :: Proxy Mocked) p
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```
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To understand the, better start at the end:
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`listFromAPI` gives us a list of endpoints. We iterate over them (`foldr`) and call `generateEndpoint` for every endpoint.
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As generate endpoint will not return `Text` but `IO Text` (remember we need some random bits to mock), we cannot just use the cons operator but need to build `IO [Text]` from `IO Text`s.
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``` haskell
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mCons :: IO a -> IO [a] -> IO [a]
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mCons ele list =
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ele >>= \e -> list >>= \l -> return ( e : l )
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```
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Now comes the juicy part; accessing the endpoints data:
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``` haskell
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generateEndpoint :: Text -> Req Mocked -> IO Text
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generateEndpoint host req =
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case maybeBody of
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Just body ->
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body >>= \b -> return $ T.intercalate " " [ "curl", "-X", method, "-d", "'" <> b <> "'"
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, "-H 'Content-Type: application/json'", host <> "/" <> url ]
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Nothing ->
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return $ T.intercalate " " [ "curl", "-X", method, host <> "/" <> url ]
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where
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method = decodeUtf8 $ req ^. reqMethod
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url = T.intercalate "/" $ map segment (req ^. reqUrl . path)
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maybeBody = fmap (\(Mocked io) -> io) (req ^. reqBody)
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```
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`servant-foreign` offers a multitude of lenses to be used with `Req`-values.
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`reqMethod` gives us a straigthforward `Network.HTTP.Types.Method`, `reqUrl` the url part and so on.
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Just take a look at [the docs](https://hackage.haskell.org/package/servant-foreign-0.11.1/docs/Servant-Foreign.html).
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But how do we get our mocked json string? This seems to be a bit to short to be true:
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``` haskell ignore
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maybeBody = fmap (\(Mocked io) -> io) (req ^. reqBody)
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```
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But it is that simple!
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The docs say `reqBody` gives us a `Maybe f`. What is `f`, you ask? As defined in `generateCurl`, `f` is `Mocked` and contains a `IO Text`. How is this `Mocked` value created? The `HasForeignType::typeFor` does it!
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||||
Of course only if the endpoint has a request body.
|
||||
|
||||
|
||||
Some (incomplete) code for url segments:
|
||||
``` haskell
|
||||
segment :: Segment Mocked -> Text
|
||||
segment seg =
|
||||
case unSegment seg of
|
||||
Static p ->
|
||||
unPathSegment p
|
||||
|
||||
Cap arg ->
|
||||
-- Left as exercise for the reader: Mock args in the url
|
||||
unPathSegment $ arg ^. argName
|
||||
```
|
||||
|
||||
And now, lets hook it all up in our main function:
|
||||
|
||||
``` haskell
|
||||
main :: IO ()
|
||||
main =
|
||||
generateCurl api "localhost:8081" >>= (\v -> T.IO.putStrLn v)
|
||||
```
|
||||
|
||||
Done:
|
||||
|
||||
``` curl
|
||||
curl -X GET localhost:8081/users
|
||||
curl -X POST -d '{"email":"wV_b:z!(3DM V","age":10,"name":"=|W"}' -H 'Content-Type: application/json' localhost:8081/new/user
|
||||
|
||||
```
|
||||
|
||||
This is of course no complete curl call mock generator, many things including path arguments are missing.
|
||||
But it correctly generate mock calls for simple POST requests.
|
||||
|
||||
Also, we now know how to use `HasForeignType` and `listFromAPI` to generate anything we want.
|
||||
|
|
@ -0,0 +1,27 @@
|
|||
name: cookbook-curl-mock
|
||||
version: 0.1
|
||||
synopsis: Generate curl mock requests cookbook example
|
||||
homepage: http://haskell-servant.readthedocs.org
|
||||
license: BSD3
|
||||
license-file: ../../../servant/LICENSE
|
||||
author: Servant Contributors
|
||||
maintainer: haskell-servant-maintainers@googlegroups.com
|
||||
build-type: Simple
|
||||
cabal-version: >=1.10
|
||||
tested-with: GHC==8.0.2, GHC==8.2.2, GHC==8.4.3
|
||||
|
||||
executable cookbock-curl-mock
|
||||
main-is: CurlMock.lhs
|
||||
build-depends: base == 4.*
|
||||
, aeson
|
||||
, aeson-compat
|
||||
, lens
|
||||
, text
|
||||
, servant
|
||||
, servant-server
|
||||
, servant-foreign
|
||||
, QuickCheck
|
||||
, generic-arbitrary
|
||||
default-language: Haskell2010
|
||||
ghc-options: -Wall -pgmL markdown-unlit
|
||||
build-tool-depends: markdown-unlit:markdown-unlit
|
||||
|
|
@ -28,3 +28,4 @@ you name it!
|
|||
jwt-and-basic-auth/JWTAndBasicAuth.lhs
|
||||
file-upload/FileUpload.lhs
|
||||
pagination/Pagination.lhs
|
||||
curl-mock/CurlMock.lhs
|
||||
|
|
|
|||
Loading…
Reference in New Issue