4 files changed, 77 insertions, 29 deletions

diff --git a/market.py b/market.py
index 5876071..7996a58 100644
--- a/market.py
+++ b/market.py
@@ -254,8 +254,7 @@ class Processor:
                 {
                     "name": "print_balances",
                     "number": 1,
-                    "fetch_balances": ["begin"],
-                    "fetch_balances_args": { "add_portfolio": True },
+                    "fetch_balances_begin": { "log_tickers": True, "add_portfolio": True },
                     "print_tickers": { "base_currency": "BTC" },
                     }
                 ],
@@ -272,25 +271,37 @@ class Processor:
                     "number": 2,
                     "before": False,
                     "after": True,
-                    "fetch_balances": ["begin"],
+                    "fetch_balances_begin": {},
                     "prepare_trades": { "compute_value": "average" },
                     "prepare_orders": { "compute_value": "average" },
                     },
                 ],
             "sell_needed": [
                 {
-                    "name": "wait",
+                    "name": "print_balances",
                     "number": 0,
+                    "before": True,
+                    "after": False,
+                    "fetch_balances_begin": {
+                        "checkpoint": "end",
+                        "log_tickers": True,
+                        "add_portfolio": True
+                        },
+                    },
+                {
+                    "name": "wait",
+                    "number": 1,
                     "before": False,
                     "after": True,
                     "wait_for_recent": {},
                     },
                 {
                     "name": "sell",
-                    "number": 1,
+                    "number": 2,
                     "before": False,
                     "after": True,
-                    "fetch_balances": ["begin", "end"],
+                    "fetch_balances_begin": {},
+                    "fetch_balances_end": {},
                     "prepare_trades": {},
                     "prepare_orders": { "only": "dispose", "compute_value": "average" },
                     "run_orders": {},
@@ -299,10 +310,14 @@ class Processor:
                     },
                 {
                     "name": "buy",
-                    "number": 2,
+                    "number": 3,
                     "before": False,
                     "after": True,
-                    "fetch_balances": ["begin", "end"],
+                    "fetch_balances_begin": {},
+                    "fetch_balances_end": {
+                        "checkpoint": "begin",
+                        "log_tickers": True
+                        },
                     "prepare_trades": { "only": "acquire", "available_balance_only": True },
                     "prepare_orders": { "only": "acquire", "compute_value": "average" },
                     "move_balances": {},
@@ -317,7 +332,12 @@ class Processor:
                     "number": 1,
                     "before": True,
                     "after": False,
-                    "fetch_balances": ["begin", "end"],
+                    "fetch_balances_begin": {
+                        "checkpoint": "end",
+                        "log_tickers": True,
+                        "add_portfolio": True
+                        },
+                    "fetch_balances_end": {},
                     "prepare_trades": { "repartition": { "base_currency": (1, "long") } },
                     "prepare_orders": { "compute_value": "average" },
                     "run_orders": {},
@@ -336,7 +356,11 @@ class Processor:
                     "number": 3,
                     "before": False,
                     "after": True,
-                    "fetch_balances": ["begin", "end"],
+                    "fetch_balances_begin": {},
+                    "fetch_balances_end": {
+                        "checkpoint": "begin",
+                        "log_tickers": True
+                        },
                     "prepare_trades": { "available_balance_only": True },
                     "prepare_orders": { "compute_value": "average" },
                     "move_balances": {},
@@ -388,18 +412,18 @@ class Processor:
         process_name = "process_{}__{}_{}".format(scenario_name, step["number"], step["name"])
         self.market.report.log_stage("{}_begin".format(process_name))
 
-        fetch_args = step.get("fetch_balances_args", {})
-        if "begin" in step.get("fetch_balances", []):
+        if "fetch_balances_begin" in step:
             self.market.balances.fetch_balances(tag="{}_begin".format(process_name),
-                    log_tickers=True, **fetch_args)
+                    **step["fetch_balances_begin"])
 
         for action in self.ordered_actions:
             if action in step:
                 self.run_action(action, step[action], kwargs)
 
-        if "end" in step.get("fetch_balances", []):
+        if "fetch_balances_end" in step:
             self.market.balances.fetch_balances(tag="{}_end".format(process_name),
-                    log_tickers=True, **fetch_args)
+                    **step["fetch_balances_end"])
+
         self.market.report.log_stage("{}_end".format(process_name))
 
     def method_arguments(self, action):
diff --git a/store.py b/store.py
index 76cfec8..2a71bed 100644
--- a/store.py
+++ b/store.py
@@ -99,7 +99,7 @@ class ReportStore:
             "args": args,
             })
 
-    def log_balances(self, tag=None, tickers=None,
+    def log_balances(self, tag=None, checkpoint=None, tickers=None,
             ticker_currency=None, compute_value=None, type=None):
         self.print_log("[Balance]")
         for currency, balance in self.market.balances.all.items():
@@ -108,6 +108,7 @@ class ReportStore:
         log = {
                 "type": "balance",
                 "tag": tag,
+                "checkpoint": checkpoint,
                 "balances": self.market.balances.as_json()
                 }
 
@@ -303,7 +304,8 @@ class BalanceStore:
                 compute_value, type)
         return amounts
 
-    def fetch_balances(self, tag=None, add_portfolio=False, log_tickers=False,
+    def fetch_balances(self, tag=None, add_portfolio=False,
+            checkpoint=None, log_tickers=False,
             ticker_currency="BTC", ticker_compute_value="average", ticker_type="total"):
         all_balances = self.market.ccxt.fetch_all_balances()
         for currency, balance in all_balances.items():
@@ -315,11 +317,11 @@ class BalanceStore:
                 self.all.setdefault(currency, portfolio.Balance(currency, {}))
         if log_tickers:
             tickers = self.in_currency(ticker_currency, compute_value=ticker_compute_value, type=ticker_type)
-            self.market.report.log_balances(tag=tag,
+            self.market.report.log_balances(tag=tag, checkpoint=checkpoint,
                     tickers=tickers, ticker_currency=ticker_currency,
                     compute_value=ticker_compute_value, type=ticker_type)
         else:
-            self.market.report.log_balances(tag=tag)
+            self.market.report.log_balances(tag=tag, checkpoint=checkpoint)
 
     def dispatch_assets(self, amount, liquidity="medium", repartition=None):
         if repartition is None:
diff --git a/tests/test_market.py b/tests/test_market.py
index 46fad53..37c009b 100644
--- a/tests/test_market.py
+++ b/tests/test_market.py
@@ -174,7 +174,7 @@ class MarketTest(WebMockTestCase):
                     base_currency='BTC', compute_value='average',
                     available_balance_only=False, liquidity='medium',
                     only=None, repartition=None)
-            m.report.log_balances.assert_called_once_with(tag="tag")
+            m.report.log_balances.assert_called_once_with(tag="tag", checkpoint=None)
 
         compute_trades.reset_mock()
         with self.subTest(available_balance_only=True),\
@@ -964,7 +964,7 @@ class ProcessorTest(WebMockTestCase):
             process_step.reset_mock()
 
             processor.process("sell_needed", steps=["before", "after"])
-            self.assertEqual(3, process_step.call_count)
+            self.assertEqual(4, process_step.call_count)
 
     def test_method_arguments(self):
         ccxt = mock.Mock(spec=market.ccxt.poloniexE)
@@ -1002,17 +1002,17 @@ class ProcessorTest(WebMockTestCase):
         processor = market.Processor(self.m)
 
         with mock.patch.object(processor, "run_action") as run_action:
-            step = processor.scenarios["sell_needed"][1]
+            step = processor.scenarios["sell_needed"][2]
 
             processor.process_step("foo", step, {"foo":"bar"})
 
             self.m.report.log_stage.assert_has_calls([
-                mock.call("process_foo__1_sell_begin"),
-                mock.call("process_foo__1_sell_end"),
+                mock.call("process_foo__2_sell_begin"),
+                mock.call("process_foo__2_sell_end"),
                 ])
             self.m.balances.fetch_balances.assert_has_calls([
-                mock.call(tag="process_foo__1_sell_begin", log_tickers=True),
-                mock.call(tag="process_foo__1_sell_end", log_tickers=True),
+                mock.call(tag="process_foo__2_sell_begin"),
+                mock.call(tag="process_foo__2_sell_end"),
                 ])
 
             self.assertEqual(5, run_action.call_count)
@@ -1030,6 +1030,24 @@ class ProcessorTest(WebMockTestCase):
             step = processor.scenarios["sell_needed"][0]
 
             processor.process_step("foo", step, {"foo":"bar"})
+
+            self.m.report.log_stage.assert_has_calls([
+                mock.call("process_foo__0_print_balances_begin"),
+                mock.call("process_foo__0_print_balances_end"),
+                ])
+            self.m.balances.fetch_balances.assert_has_calls([
+                mock.call(add_portfolio=True, checkpoint='end',
+                    log_tickers=True,
+                    tag='process_foo__0_print_balances_begin')
+                ])
+
+            self.assertEqual(0, run_action.call_count)
+
+        self.m.reset_mock()
+        with mock.patch.object(processor, "run_action") as run_action:
+            step = processor.scenarios["sell_needed"][1]
+
+            processor.process_step("foo", step, {"foo":"bar"})
             self.m.balances.fetch_balances.assert_not_called()
 
         self.m.reset_mock()
diff --git a/tests/test_store.py b/tests/test_store.py
index ee7e063..58e76e0 100644
--- a/tests/test_store.py
+++ b/tests/test_store.py
@@ -380,7 +380,7 @@ class BalanceStoreTest(WebMockTestCase):
             balance_store.fetch_balances(tag="foo")
             self.assertEqual(0, balance_store.all["ETC"].total)
             self.assertListEqual(["USDT", "XVG", "XMR", "ETC"], list(balance_store.currencies()))
-            self.m.report.log_balances.assert_called_with(tag="foo")
+            self.m.report.log_balances.assert_called_with(tag="foo", checkpoint=None)
 
         with self.subTest(log_tickers=True),\
                 mock.patch.object(balance_store, "in_currency") as in_currency:
@@ -388,7 +388,7 @@ class BalanceStoreTest(WebMockTestCase):
             balance_store.fetch_balances(log_tickers=True, ticker_currency="FOO",
                     ticker_compute_value="compute", ticker_type="type")
             self.m.report.log_balances.assert_called_with(compute_value='compute',
-                    tag=None, ticker_currency='FOO', tickers='tickers',
+                    tag=None, checkpoint=None, ticker_currency='FOO', tickers='tickers',
                     type='type')
 
         balance_store = market.BalanceStore(self.m)
@@ -425,7 +425,7 @@ class BalanceStoreTest(WebMockTestCase):
         self.assertEqual(D("2.6"), amounts["BTC"].value)
         self.assertEqual(D("7.5"), amounts["XEM"].value)
         self.assertEqual(D("-1.0"), amounts["DASH"].value)
-        self.m.report.log_balances.assert_called_with(tag=None)
+        self.m.report.log_balances.assert_called_with(tag=None, checkpoint=None)
         self.m.report.log_dispatch.assert_called_once_with(portfolio.Amount("BTC",
             "11.1"), amounts, "medium", repartition_hash)
 
@@ -617,12 +617,14 @@ class ReportStoreTest(WebMockTestCase):
                 ])
             add_log.assert_called_once_with({
                 'type': 'balance',
+                'checkpoint': None,
                 'balances': 'json',
                 'tag': 'tag'
                 })
             add_redis_status.assert_called_once_with({
                 'type': 'balance',
                 'balances': 'json',
+                'checkpoint': None,
                 'tag': 'tag'
                 })
         add_log.reset_mock()
@@ -639,6 +641,7 @@ class ReportStoreTest(WebMockTestCase):
                     type="total")
             add_log.assert_called_once_with({
                 'type': 'balance',
+                'checkpoint': None,
                 'balances': 'json',
                 'tag': 'tag',
                 'tickers': {
@@ -658,6 +661,7 @@ class ReportStoreTest(WebMockTestCase):
                 })
             add_redis_status.assert_called_once_with({
                 'type': 'balance',
+                'checkpoint': None,
                 'balances': 'json',
                 'tag': 'tag',
                 'tickers': {