Add client chapter 31

31-final-project/client/LICENSE

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+Copyright Gaël Depreeuw (c) 2018
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Gaël Depreeuw nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

31-final-project/client/README.md

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+# client

31-final-project/client/Setup.hs

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+import Distribution.Simple
+main = defaultMain

31-final-project/client/client.cabal

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+name:                client
+version:             0.1.0.0
+-- synopsis:
+-- description:
+homepage:            https://github.com/Mithror/client#readme
+license:             BSD3
+license-file:        LICENSE
+author:              Gaël Depreeuw
+maintainer:          gael.depreeuw@gmail.com
+copyright:           Copyright (c) 2018 Gaël Depreeuw
+category:            daemon
+build-type:          Simple
+cabal-version:       >=1.10
+extra-source-files:  README.md
+
+executable client
+  hs-source-dirs:      src
+  main-is:             Main.hs
+  default-language:    Haskell2010
+  build-depends:       base >= 4.7 && < 5
+                     , network
+                     , text
+                     , bytestring
+                     , transformers
+                     , optparse-applicative

31-final-project/client/src/Main.hs

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+{-# LANGUAGE OverloadedStrings #-}
+
+module Main where
+
+import qualified Control.Exception as E
+import qualified Data.ByteString.Char8 as C
+import System.IO
+import Network.Socket hiding (recv)
+import Network.Socket.ByteString (recv, sendAll)
+import Data.Text (Text)
+import Data.String (fromString)
+import Control.Monad.Trans.Reader
+import Control.Monad.IO.Class (liftIO)
+import Options.Applicative
+import Data.Semigroup ((<>))
+
+type Host = String
+type Port = String
+
+data Config = Config { configHost :: Host
+                     , configPort :: Port
+                     } deriving (Eq, Show)
+
+type ConfigT a = ReaderT Config IO a
+
+sendData :: C.ByteString -> ConfigT ()
+sendData byteString = do
+    config <- ask
+    liftIO $ withSocketsDo $ do
+      addr <- resolve (configHost config) (configPort config)
+      E.bracket (open addr) close (talk byteString)
+  where
+    resolve h p = do
+      let hints = defaultHints { addrSocketType = Stream }
+      addr:_ <- getAddrInfo (Just hints) (Just h) (Just p)
+      return addr
+    open addr = do
+      sock <- socket (addrFamily addr) (addrSocketType addr) defaultProtocol --(addrProtocol addr)
+      connect sock $ addrAddress addr
+      return sock
+    talk bs sock = do
+      sendAll sock $ bs
+      msg <- recv sock 1024
+      C.putStrLn msg
+
+sendJSON :: FilePath -> ConfigT ()
+sendJSON filePath =
+  (liftIO $ readFile filePath) >>= (sendData . fromString . (++ "\0"))
+
+sendFinger :: String -> ConfigT ()
+sendFinger = sendData . fromString . (++ "\r\n")
+
+data Arguments = Finger String Config
+               | FileInput FilePath Config
+               deriving (Show, Eq)
+
+configInput :: Parser Config
+configInput = Config
+  <$> strOption
+    (  long "host"
+    <> short 'h'
+    <> metavar "HOST"
+    <> help "host to connect to")
+  <*> strOption
+    (  long "port"
+    <> short 'p'
+    <> metavar "PORT"
+    <> help "port of daemon")
+
+fingerInput :: Parser Arguments
+fingerInput = Finger
+  <$> strOption
+    (  long "name"
+    <> short 'n'
+    <> metavar "NAME"
+    <> help "name of person to look up")
+  <*> configInput
+
+fileInput :: Parser Arguments
+fileInput = FileInput
+  <$> strOption
+    (  long "file"
+    <> short 'f'
+    <> metavar "FILENAME"
+    <> help "json file with config")
+  <*> configInput
+
+input :: Parser Arguments
+input = fingerInput <|> fileInput
+
+handleArguments :: Arguments -> IO ()
+handleArguments (Finger n c) = runReaderT (sendFinger n) c
+handleArguments (FileInput f c) = runReaderT (sendJSON f) c
+
+main :: IO ()
+main = handleArguments =<< execParser opts
+  where
+    opts = info (input <**> helper)
+      ( fullDesc
+     <> progDesc "Finger a person or update the server's database."
+     <> header "client - a tool to talk to the fingerd" )
+

31-final-project/client/stack.yaml

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+# This file was automatically generated by 'stack init'
+#
+# Some commonly used options have been documented as comments in this file.
+# For advanced use and comprehensive documentation of the format, please see:
+# https://docs.haskellstack.org/en/stable/yaml_configuration/
+
+# Resolver to choose a 'specific' stackage snapshot or a compiler version.
+# A snapshot resolver dictates the compiler version and the set of packages
+# to be used for project dependencies. For example:
+#
+# resolver: lts-3.5
+# resolver: nightly-2015-09-21
+# resolver: ghc-7.10.2
+# resolver: ghcjs-0.1.0_ghc-7.10.2
+#
+# The location of a snapshot can be provided as a file or url. Stack assumes
+# a snapshot provided as a file might change, whereas a url resource does not.
+#
+# resolver: ./custom-snapshot.yaml
+# resolver: https://example.com/snapshots/2018-01-01.yaml
+resolver: lts-11.15
+
+# User packages to be built.
+# Various formats can be used as shown in the example below.
+#
+# packages:
+# - some-directory
+# - https://example.com/foo/bar/baz-0.0.2.tar.gz
+# - location:
+#    git: https://github.com/commercialhaskell/stack.git
+#    commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+# - location: https://github.com/commercialhaskell/stack/commit/e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+#  subdirs:
+#  - auto-update
+#  - wai
+packages:
+- .
+# Dependency packages to be pulled from upstream that are not in the resolver
+# using the same syntax as the packages field.
+# (e.g., acme-missiles-0.3)
+# extra-deps: []
+
+# Override default flag values for local packages and extra-deps
+# flags: {}
+
+# Extra package databases containing global packages
+# extra-package-dbs: []
+
+# Control whether we use the GHC we find on the path
+# system-ghc: true
+#
+# Require a specific version of stack, using version ranges
+# require-stack-version: -any # Default
+# require-stack-version: ">=1.7"
+#
+# Override the architecture used by stack, especially useful on Windows
+# arch: i386
+# arch: x86_64
+#
+# Extra directories used by stack for building
+# extra-include-dirs: [/path/to/dir]
+# extra-lib-dirs: [/path/to/dir]
+#
+# Allow a newer minor version of GHC than the snapshot specifies
+# compiler-check: newer-minor