exchange_rate: small fixups. BitcoinAverage, BitStamp

- BitcoinAverage seems to have historical rates for all currencies it supports
(as in, if there is spot price, there is also history).
- BitStamp now uses v2 API, also has support for EUR.
- Bitcointoyou does not seem to actually offer histories
(and `request_history` was undefined anyway)
- regenerate currencies.json

electrum/currencies.json

@@ -109,6 +109,7 @@
         "NZD",
         "OMR",
         "PAB",
+        "PAX",
         "PEN",
         "PGK",
         "PHP",
@@ -149,6 +150,7 @@
         "UYU",
         "UZS",
         "VEF",
+        "VES",
         "VND",
         "VUV",
         "WST",
@@ -164,7 +166,8 @@
         "ZWL"
     ],
     "BitStamp": [
-        "USD"
+        "USD",
+        "EUR"
     ],
     "Bitbank": [
         "JPY"
@@ -320,7 +323,7 @@
         "USD",
         "UYU",
         "UZS",
-        "VEF",
+        "VES",
         "VND",
         "VUV",
         "WST",
@@ -338,15 +341,18 @@
         "ZMW",
         "ZWL"
     ],
+    "BitcoinVenezuela": [
+        "ARS",
+        "ETH",
+        "EUR",
+        "LTC",
+        "USD",
+        "VEF",
+        "XMR"
+    ],
     "Bitcointoyou": [
         "BRL"
     ],
-    "BitcoinVenezuela": [
-        "ARS",
-        "EUR",
-        "USD",
-        "VEF"
-    ],    
     "Bitmarket": [
         "PLN"
     ],
@@ -561,6 +567,7 @@
         "AWG",
         "AZN",
         "BAM",
+        "BAT",
         "BBD",
         "BCH",
         "BDT",
@@ -572,6 +579,8 @@
         "BOB",
         "BRL",
         "BSD",
+        "BSV",
+        "BTC",
         "BTN",
         "BWP",
         "BYN",
@@ -597,6 +606,7 @@
         "EGP",
         "ERN",
         "ETB",
+        "ETC",
         "ETH",
         "EUR",
         "FJD",
@@ -718,13 +728,12 @@
         "XPT",
         "YER",
         "ZAR",
+        "ZEC",
         "ZMK",
         "ZMW",
+        "ZRX",
         "ZWL"
     ],
-    "Foxbit": [
-        "BRL"
-    ],
     "Kraken": [
         "CAD",
         "EUR",
@@ -736,8 +745,9 @@
         "AED",
         "ARS",
         "AUD",
+        "BAM",
         "BDT",
-        "BHD",
+        "BGN",
         "BOB",
         "BRL",
         "BWP",
@@ -757,7 +767,9 @@
         "GBP",
         "GEL",
         "GHS",
+        "GTQ",
         "HKD",
+        "HNL",
         "HRK",
         "HUF",
         "IDR",
@@ -777,33 +789,36 @@
         "NGN",
         "NOK",
         "NZD",
+        "OMR",
         "PAB",
         "PEN",
         "PHP",
         "PKR",
         "PLN",
-        "PYG",
+        "QAR",
         "RON",
         "RSD",
         "RUB",
+        "RWF",
         "SAR",
         "SEK",
         "SGD",
         "SZL",
         "THB",
         "TRY",
+        "TTD",
         "TWD",
         "TZS",
         "UAH",
         "UGX",
         "USD",
         "UYU",
-        "VEF",
+        "VES",
         "VND",
         "XAF",
+        "XMR",
         "XRP",
-        "ZAR",
-        "ZMW"
+        "ZAR"
     ],
     "MercadoBitcoin": [
         "BRL"
@@ -814,10 +829,8 @@
     "TheRockTrading": [
         "EUR"
     ],
-    "WEX": [
-        "EUR",
-        "RUB",
-        "USD"
+    "Zaif": [
+        "JPY"
     ],
     "itBit": []
-}
+}

electrum/exchange_rate.py

@@ -72,6 +72,7 @@ class ExchangeBase(PrintError):
             self.print_error("received fx quotes")
         except BaseException as e:
             self.print_error("failed fx quotes:", repr(e))
+            # traceback.print_exc()
             self.quotes = {}
         self.on_quotes()
 
@@ -99,7 +100,7 @@ class ExchangeBase(PrintError):
             h = await self.request_history(ccy)
             self.print_error("received fx history for", ccy)
         except BaseException as e:
-            self.print_error("failed fx history:", e)
+            self.print_error("failed fx history:", repr(e))
             #traceback.print_exc()
             return
         filename = os.path.join(cache_dir, self.name() + '_' + ccy)
@@ -124,6 +125,12 @@ class ExchangeBase(PrintError):
     def historical_rate(self, ccy, d_t):
         return self.history.get(ccy, {}).get(d_t.strftime('%Y-%m-%d'), 'NaN')
 
+    async def request_history(self, ccy):
+        raise NotImplementedError()  # implemented by subclasses
+
+    async def get_rates(self, ccy):
+        raise NotImplementedError()  # implemented by subclasses
+
     async def get_currencies(self):
         rates = await self.get_rates('')
         return sorted([str(a) for (a, b) in rates.items() if b is not None and len(a)==3])
@@ -136,9 +143,8 @@ class BitcoinAverage(ExchangeBase):
                      for r in json if r != 'timestamp'])
 
     def history_ccys(self):
-        return ['AUD', 'BRL', 'CAD', 'CHF', 'CNY', 'EUR', 'GBP', 'IDR', 'ILS',
-                'MXN', 'NOK', 'NZD', 'PLN', 'RON', 'RUB', 'SEK', 'SGD', 'USD',
-                'ZAR']
+        # BitcoinAverage seems to have historical data for all ccys it supports
+        return CURRENCIES[self.name()]
 
     async def request_history(self, ccy):
         history = await self.get_csv('apiv2.bitcoinaverage.com',
@@ -153,9 +159,6 @@ class Bitcointoyou(ExchangeBase):
         json = await self.get_json('bitcointoyou.com', "/API/ticker.aspx")
         return {'BRL': Decimal(json['ticker']['last'])}
 
-    def history_ccys(self):
-        return ['BRL']
-
 
 class BitcoinVenezuela(ExchangeBase):
 
@@ -211,9 +214,14 @@ class Bitso(ExchangeBase):
 
 class BitStamp(ExchangeBase):
 
+    async def get_currencies(self):
+        return ['USD', 'EUR']
+
     async def get_rates(self, ccy):
-        json = await self.get_json('www.bitstamp.net', '/api/ticker/')
-        return {'USD': Decimal(json['last'])}
+        if ccy in CURRENCIES[self.name()]:
+            json = await self.get_json('www.bitstamp.net', f'/api/v2/ticker/btc{ccy.lower()}/')
+            return {ccy: Decimal(json['last'])}
+        return {}
 
 
 class Bitvalor(ExchangeBase):