use estimatesmartfee if the daemon supports it

mmgen/rpc.py

@@ -168,6 +168,7 @@ class CoinDaemonRPCConnection(object):
 		'decoderawtransaction',
 		'disconnectnode',
 		'estimatefee',
+		'estimatesmartfee',
 		'getaddressesbyaccount',
 		'getbalance',
 		'getblock',

mmgen/tx.py

@@ -1049,16 +1049,25 @@ class MMGenTX(MMGenObject):
 			start_fee = opt.tx_fee
 		else:
 			desc = 'Network-estimated'
-			ret = g.rpch.estimatefee(opt.tx_confs)
-			if ret == -1:
+			try:
+				ret = g.rpch.estimatesmartfee(opt.tx_confs,on_fail='raise')
+			except:
+				fetype = 'estimatefee'
+				fee_per_kb = g.rpch.estimatefee(opt.tx_confs)
+			else:
+				fetype = 'estimatesmartfee'
+				fee_per_kb = ret['feerate'] if 'feerate' in ret else -2
+
+			if fee_per_kb < 0:
 				if not have_estimate_fail:
-					msg('Network fee estimation for {} confirmations failed'.format(opt.tx_confs))
+					msg('Network fee estimation for {} confirmations failed ({})'.format(opt.tx_confs,fetype))
 					have_estimate_fail.append(True)
 				start_fee = None
 			else:
-				start_fee = g.proto.coin_amt(ret) * opt.tx_fee_adj * self.estimate_size() / 1024
+				start_fee = g.proto.coin_amt(fee_per_kb) * opt.tx_fee_adj * self.estimate_size() / 1024
 				if opt.verbose:
-					msg('{} fee ({} confs): {} {}/kB'.format(desc,opt.tx_confs,ret,g.coin))
+					msg('{} fee for {} confirmations: {} {}/kB'.format(
+						fetype.upper(),opt.tx_confs,fee_per_kb,g.coin))
 					msg('TX size (estimated): {}'.format(self.estimate_size()))
 
 		return self.get_usr_fee_interactive(start_fee,desc=desc)

test/test.py

@@ -685,6 +685,7 @@ cmd_group['regtest'] = (
 	('regtest_alice_chk_label3',   'the label'),
 	('regtest_alice_remove_label1','removing a label'),
 	('regtest_alice_chk_label4',   'the label'),
+	('regtest_alice_send_estimatefee','tx creation with no fee on command line'),
 	('regtest_stop',               'stopping regtest daemon'),
 )
 
@@ -2326,13 +2327,16 @@ class MMGenTestSuite(object):
 							bad_locktime=False):
 		os.environ['MMGEN_BOGUS_SEND'] = ''
 		t = MMGenExpect(name,'mmgen-txdo',
-			['-d',cfg['tmpdir'],'-B','--'+user,'--tx-fee='+fee]
-			+ extra_args + ([],[wf])[bool(wf)] + outputs_cl)
+			['-d',cfg['tmpdir'],'-B','--'+user] +
+			(['--tx-fee='+fee] if fee else []) +
+			extra_args + ([],[wf])[bool(wf)] + outputs_cl)
 		os.environ['MMGEN_BOGUS_SEND'] = '1'
 
 		t.expect(r"'q'=quit view, .*?:.",'M',regex=True) # sort by mmid
 		t.expect(r"'q'=quit view, .*?:.",'q',regex=True)
 		t.expect('outputs to spend: ',outputs_prompt+'\n')
+		if not fee:
+			t.expect('Enter transaction fee: ','{}\n'.format(tx_fee))
 		t.expect('OK? (Y/n): ','y') # fee OK?
 		t.expect('OK? (Y/n): ','y') # change OK?
 		if do_label:
@@ -2389,6 +2393,10 @@ class MMGenTestSuite(object):
 		fn = os.path.join(cfg['tmpdir'],'non-mmgen.keys')
 		return self.regtest_user_txdo(name,'bob',rtFee[3],outputs_cl,'3-9',extra_args=['--keys-from-file='+fn])
 
+	def regtest_alice_send_estimatefee(self,name):
+		outputs_cl = self.create_tx_outputs('bob',(('L',1,''),)) # bob_sid:L:1
+		return self.regtest_user_txdo(name,'alice',None,outputs_cl,'1') # fee=None
+
 	def regtest_user_txbump(self,name,user,txfile,fee,red_op,no_send=False):
 		if not g.proto.cap('rbf'):
 			msg('Skipping RBF'); return True