Haskell Quickstart Guide
兼容 Amazon S3 对象存储的 MinIO Haskell Client SDK 


MinIO Haskell Client SDK 提供简洁的 API,用于访问 MinIO 以及任何兼容 Amazon S3 的对象存储。
本指南假定你已具备可用的 Haskell 开发环境。
安装
添加到项目中
将 minio-hs 添加到项目的 .cabal 依赖部分;如果你使用 hpack,则添加到 package.yaml 文件中。
在 REPL 中试用
对于使用 cabal 的用户
下载库源代码并切换到解压后的目录:
$ cabal get minio-hs
$ cd minio-hs-1.6.0/ # directory name could be different
然后在已加载该库的 ghci REPL 环境中查看可用的 API:
$ cabal repl
ghci> :browse Network.Minio
对于使用 stack 的用户
在主目录或任意非 Haskell 项目目录中直接运行:
stack install minio-hs
然后启动解释器会话,并通过以下命令查看可用的 API:
$ stack ghci
> :browse Network.Minio
示例
examples 目录包含许多示例,你可以通过试用这些示例进行学习,并用于开发自己的项目。
快速入门示例 - 文件上传器
该示例程序会连接到 MinIO 对象存储服务器,在服务器上创建一个存储桶,然后将文件上传到该存储桶。
本示例使用部署在 https://play.min.io 的 MinIO 服务器。你可以使用该服务进行测试和开发。访问凭证已内置在库中,且为公开信息。
FileUploader.hs
#!/usr/bin/env stack
-- stack --resolver lts-14.11 runghc --package minio-hs --package optparse-applicative --package filepath
--
-- MinIO Haskell SDK, (C) 2017-2019 MinIO, Inc.
--
-- 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.
--
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
import Network.Minio
import Data.Monoid ((<>))
import Data.Text (pack)
import Options.Applicative
import System.FilePath.Posix
import UnliftIO (throwIO, try)
import Prelude
-- | The following example uses minio's play server at
-- https://play.min.io. The endpoint and associated
-- credentials are provided via the libary constant,
--
-- > minioPlayCI :: ConnectInfo
--
-- optparse-applicative package based command-line parsing.
fileNameArgs :: Parser FilePath
fileNameArgs = strArgument
(metavar "FILENAME"
<> help "Name of file to upload to AWS S3 or a MinIO server")
cmdParser = info
(helper <*> fileNameArgs)
(fullDesc
<> progDesc "FileUploader"
<> header
"FileUploader - a simple file-uploader program using minio-hs")
main :: IO ()
main = do
let bucket = "my-bucket"
-- Parse command line argument
filepath <- execParser cmdParser
let object = pack $ takeBaseName filepath
res <- runMinio minioPlayCI $ do
-- Make a bucket; catch bucket already exists exception if thrown.
bErr <- try $ makeBucket bucket Nothing
-- If the bucket already exists, we would get a specific
-- `ServiceErr` exception thrown.
case bErr of
Left BucketAlreadyOwnedByYou -> return ()
Left e -> throwIO e
Right _ -> return ()
-- Upload filepath to bucket; object name is derived from filepath.
fPutObject bucket object filepath defaultPutObjectOptions
case res of
Left e -> putStrLn $ "file upload failed due to " ++ show e
Right () -> putStrLn "file upload succeeded."
运行 FileUploader
./FileUploader.hs "path/to/my/file"
贡献
开发
下载源码
$ git clone https://github.com/minio/minio-hs.git
$ cd minio-hs/
构建软件包
使用 cabal:
$ # Configure cabal for development enabling all optional flags defined by the package.
$ cabal configure --enable-tests --test-show-details=direct -fexamples -fdev -flive-test
$ cabal build
使用 stack:
$ stack build --test --no-run-tests --flag minio-hs:live-test --flag minio-hs:dev --flag minio-hs:examples
运行测试
默认情况下,部分测试会使用远程 MinIO Play 服务器 https://play.min.io。在库开发过程中,使用该远程服务器可能较慢。若要针对本地运行的 MinIO server http://localhost:9000 执行测试,并使用凭证 access_key=minio 与 secret_key=minio123,只需将环境变量 MINIO_LOCAL 设置为任意值(取消设置后将切回 Play)。
使用 cabal:
$ export MINIO_LOCAL=1 # to run live tests against local MinIO server
$ cabal test
使用 stack:
$ export MINIO_LOCAL=1 # to run live tests against local MinIO server
stack test --flag minio-hs:live-test --flag minio-hs:dev
这将运行所有测试套件。
构建文档
$ cabal haddock
$ # OR
$ stack haddock
Portions of this page are adapted from the MinIO Object Storage Documentation, © 2020–Present MinIO, Inc., licensed under CC BY 4.0, converted and maintained by the Silo project. Attribution