updates generate command

restores compatibility with older nodes

CHANGELOG

@@ -1,3 +1,7 @@
+1.9.1
+
+  * tries to call 'generate' before falling back to 'generatetoaddress'
+
 1.9.0
 
   * removes 'generate' rpc call

network-bitcoin.cabal

@@ -1,5 +1,5 @@
 Name:                network-bitcoin
-Version:             1.9.0
+Version:             1.9.1
 Synopsis:            An interface to bitcoind.
 Description:
     This can be used to send Bitcoins, query balances, etc.  It

src/Network/Bitcoin/Mining.hs

@@ -31,10 +31,15 @@ module Network.Bitcoin.Mining ( Client
                               , submitBlock
                               ) where
 
+import           Control.Exception        (catch, throw)
 import           Control.Monad
 import           Data.Aeson               as A
 import           Network.Bitcoin.Internal
 import           Network.Bitcoin.Wallet   (getNewAddress)
+import           Network.HTTP.Client      (HttpException (..),
+                                           HttpExceptionContent (..),
+                                           responseStatus)
+import           Network.HTTP.Types       (status404)
 
 -- | Returns whether or not bitcoind is generating bitcoins.
 getGenerate :: Client -- ^ bitcoind RPC client
@@ -72,7 +77,13 @@ generate :: Client
                            --   hashes of the generated blocks
                            --   (may be empty if used with generate 0)
 generate client blocks maxTries =
-    getNewAddress client Nothing >>= flip (generateToAddress client blocks) maxTries
+    callApi client "generate" args `catch` onFail
+  where
+    args = tj blocks : maybe [] (pure . tj) maxTries
+    onFail (HttpExceptionRequest _ (StatusCodeException rsp _))
+        | responseStatus rsp == status404
+        = getNewAddress client Nothing >>= flip (generateToAddress client blocks) maxTries
+    onFail e = throw e
 
 -- | The generatetoaddress RPC mines blocks immediately to a specified address.
 --   See https://bitcoin.org/en/developer-reference#generatetoaddress for more details.

src/Network/Bitcoin/RawTransaction.hs

@@ -51,7 +51,7 @@ type RawTransaction = HexString
 getRawTransaction :: Client -> TransactionID -> IO RawTransaction
 getRawTransaction client txid =
     callApi client "getrawtransaction" [ tj txid, tj verbose ]
-        where verbose = 0 :: Int
+        where verbose = False
 
 -- | A transaction into an account. This can either be a coinbase transaction,
 --   or a standard transaction with another account.