do stuff

app/server/Launcher.hs

@@ -0,0 +1,45 @@
+module Launcher where
+
+import Control.Concurrent.Async
+import Prelude
+import System.Process
+
+-- What is @bracket@?
+--
+-- When you want to acquire a resource, do some work with it, and then release
+-- the resource, it is a good idea to use bracket, because bracket will install
+-- the necessary exception handler to release the resource in the event that an
+-- exception is raised during the computation. If an exception is raised, then
+-- bracket will re-raise the exception (after performing the release).
+--
+-- http://hackage.haskell.org/package/base-4.12.0.0/docs/Control-Exception-Base.html#v:bracket
+
+
+
+
+
+
+
+
+
+-- | Run an external process alongside a haskell IO action
+--
+-- Both are expected to run forever.
+--
+-- Sadly you cannot quit this in ghci
+bracketProcess :: CreateProcess -> IO () -> IO ()
+bracketProcess process action = do
+    _ <- withCreateProcess
+        process {delegate_ctlc = True, std_out = CreatePipe }
+        $ \_stdin _stdout _stderr ph -> do
+        -- if this IO action throws, @withCreateProcess@ will kill the node and
+        -- rethrow.
+        concurrently action (node ph)
+    return ()
+  where
+    node ph = do
+        _ <- waitForProcess ph
+        fail "why is the node gone?"
+
+
+

app/server/Main.hs

@@ -9,8 +9,10 @@
 -}
 module Main where
 
+import Control.Concurrent
 import Control.Monad
     ( when )
+import Launcher
 import Prelude
 import System.Console.Docopt
     ( Arguments
@@ -25,6 +27,7 @@ import System.Console.Docopt
     )
 import System.Environment
     ( getArgs )
+import System.Process
 import Text.Read
     ( readMaybe )
 
@@ -60,10 +63,38 @@ main = do
     walletPort <- getArg args (longOption "wallet-server-port") readInt
 
     putStrLn $
-        "TODO: start wallet on port " ++ (show walletPort) ++
-        ",\n      connecting to " ++ (show network) ++
+        "Starting wallet on port " ++ (show walletPort) ++
+        ",\n         connecting to " ++ (show network) ++
         " node on port " ++ (show nodePort)
 
+    bracketProcess
+        (nodeHttpBridgeOn nodePort network)
+        (walletOn walletPort)
+
+
+sleep :: CreateProcess
+sleep = (proc "sleep" ["10"])
+
+
+-- |
+-- Requires cardano-http-bridge to be installed
+--
+-- git clone https://github.com/input-output-hk/cardano-http-bridge
+-- follow instructions in its readme
+-- cargo install --path .
+--
+nodeHttpBridgeOn :: Int -> Network -> CreateProcess
+nodeHttpBridgeOn port _network =
+    (proc "cardano-http-bridge" ["start", "--port", show port])
+
+-- TODO: Start actual wallet
+walletOn :: Int -> IO ()
+walletOn _port = go
+  where
+    go = do
+        putStrLn "I'm wallet-ing"
+        threadDelay $ 200*1000
+        go
 
 -- Functions for parsing the values of command line options
 --

cardano-wallet.cabal

@@ -65,8 +65,13 @@ executable cardano-wallet-server
   build-depends:
       base
     , docopt
+    , process
+    , async
+    , unix
   hs-source-dirs:
       app/server
+  other-modules:
+      Launcher
   main-is:
       Main.hs