rvv041 - Address Book table added to database

getAdrBook function to get a list of all addresses
         recorded in AddressBook table

.gitignore

@@ -1,3 +1,5 @@
 .stack-work/
 *~
 dist-newstyle/
+zenith.db
+zenith.log

src/Zenith/DB.hs

@@ -246,6 +246,12 @@ share
     position Int
     UniqueSSPos tx position
     deriving Show Eq
+  AddressBook
+    network ZcashNetDB
+    descrip T.Text
+    address HexStringDB
+    UniqueABA address
+    deriving Show Eq
     |]
 
 -- * Database functions
@@ -1467,5 +1473,16 @@ readUnifiedAddressDB :: WalletAddress -> Maybe UnifiedAddress
 readUnifiedAddressDB =
   isValidUnifiedAddress . TE.encodeUtf8 . getUA . walletAddressUAddress
 
+-- | Get list of external zcash addresses from database
+getAdrBook :: ConnectionPool -> ZcashNet -> IO [Entity AddressBook]
+getAdrBook pool n =
+  runNoLoggingT $
+  PS.retryOnBusy $
+  flip PS.runSqlPool pool $ do
+    select $ do
+      adrbook <- from $ table @AddressBook
+      where_ (adrbook ^. AddressBookNetwork ==. val (ZcashNetDB n))
+      pure adrbook
+
 rmdups :: Ord a => [a] -> [a]
 rmdups = map head . group . sort