stack_wallet/lib/services/price.dart

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import 'dart:async';
import 'dart:convert';
import 'package:decimal/decimal.dart';
import 'package:flutter/foundation.dart';
import 'package:http/http.dart';
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import 'package:stackwallet/db/hive/db.dart';
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import 'package:stackwallet/utilities/enums/coin_enum.dart';
import 'package:stackwallet/utilities/logger.dart';
import 'package:stackwallet/utilities/prefs.dart';
import 'package:tuple/tuple.dart';
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class PriceAPI {
static const refreshInterval = 60;
// initialize to older than current time minus at least refreshInterval
static DateTime _lastCalled =
DateTime.now().subtract(const Duration(seconds: refreshInterval + 10));
static String _lastUsedBaseCurrency = "";
static const Duration refreshIntervalDuration =
Duration(seconds: refreshInterval);
final Client client;
PriceAPI(this.client);
@visibleForTesting
void resetLastCalledToForceNextCallToUpdateCache() {
_lastCalled = DateTime(1970);
}
Future<void> _updateCachedPrices(
Map<Coin, Tuple2<Decimal, double>> data) async {
final Map<String, dynamic> map = {};
for (final coin in Coin.values) {
final entry = data[coin];
if (entry == null) {
map[coin.prettyName] = ["0", 0.0];
} else {
map[coin.prettyName] = [entry.item1.toString(), entry.item2];
}
}
await DB.instance
.put<dynamic>(boxName: DB.boxNamePriceCache, key: 'cache', value: map);
}
Map<Coin, Tuple2<Decimal, double>> get _cachedPrices {
final map =
DB.instance.get<dynamic>(boxName: DB.boxNamePriceCache, key: 'cache')
as Map? ??
{};
// init with 0
final result = {
for (final coin in Coin.values) coin: Tuple2(Decimal.zero, 0.0)
};
for (final entry in map.entries) {
result[coinFromPrettyName(entry.key as String)] = Tuple2(
Decimal.parse(entry.value[0] as String), entry.value[1] as double);
}
return result;
}
Future<Map<Coin, Tuple2<Decimal, double>>> getPricesAnd24hChange(
{required String baseCurrency}) async {
final now = DateTime.now();
if (_lastUsedBaseCurrency != baseCurrency ||
now.difference(_lastCalled).inSeconds > 0) {
_lastCalled = now;
_lastUsedBaseCurrency = baseCurrency;
} else {
return _cachedPrices;
}
final externalCalls = Prefs.instance.externalCalls;
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if ((!Logger.isTestEnv && !externalCalls) ||
!(await Prefs.instance.isExternalCallsSet())) {
Logging.instance.log("User does not want to use external calls",
level: LogLevel.Info);
return _cachedPrices;
}
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Map<Coin, Tuple2<Decimal, double>> result = {};
try {
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final uri =
Uri.parse("https://api.coingecko.com/api/v3/coins/markets?vs_currency"
"=${baseCurrency.toLowerCase()}"
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"&ids=monero,bitcoin,litecoin,ecash,epic-cash,zcoin,dogecoin,"
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"bitcoin-cash,namecoin,wownero,ethereum,particl"
"&order=market_cap_desc&per_page=50&page=1&sparkline=false");
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final coinGeckoResponse = await client.get(
uri,
headers: {'Content-Type': 'application/json'},
);
final coinGeckoData = jsonDecode(coinGeckoResponse.body) as List<dynamic>;
for (final map in coinGeckoData) {
final String coinName = map["name"] as String;
final coin = coinFromPrettyName(coinName);
final price = Decimal.parse(map["current_price"].toString());
final change24h =
double.parse(map["price_change_percentage_24h"].toString());
result[coin] = Tuple2(price, change24h);
}
// update cache
await _updateCachedPrices(result);
return _cachedPrices;
} catch (e, s) {
Logging.instance.log("getPricesAnd24hChange($baseCurrency): $e\n$s",
level: LogLevel.Error);
// return previous cached values
return _cachedPrices;
}
}
static Future<List<String>?> availableBaseCurrencies() async {
final externalCalls = Prefs.instance.externalCalls;
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if ((!Logger.isTestEnv && !externalCalls) ||
!(await Prefs.instance.isExternalCallsSet())) {
Logging.instance.log("User does not want to use external calls",
level: LogLevel.Info);
return null;
}
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const uriString =
"https://api.coingecko.com/api/v3/simple/supported_vs_currencies";
try {
final uri = Uri.parse(uriString);
final response = await Client().get(
uri,
headers: {'Content-Type': 'application/json'},
);
final json = jsonDecode(response.body) as List<dynamic>;
return List<String>.from(json);
} catch (e, s) {
Logging.instance.log("availableBaseCurrencies() using $uriString: $e\n$s",
level: LogLevel.Error);
return null;
}
}
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Future<Map<String, Tuple2<Decimal, double>>>
getPricesAnd24hChangeForEthTokens({
required Set<String> contractAddresses,
required String baseCurrency,
}) async {
final Map<String, Tuple2<Decimal, double>> tokenPrices = {};
if (contractAddresses.isEmpty) return tokenPrices;
final externalCalls = Prefs.instance.externalCalls;
if ((!Logger.isTestEnv && !externalCalls) ||
!(await Prefs.instance.isExternalCallsSet())) {
Logging.instance.log("User does not want to use external calls",
level: LogLevel.Info);
return tokenPrices;
}
try {
final contractAddressesString =
contractAddresses.reduce((value, element) => "$value,$element");
final uri = Uri.parse(
"https://api.coingecko.com/api/v3/simple/token_price/ethereum"
"?vs_currencies=${baseCurrency.toLowerCase()}&contract_addresses"
"=$contractAddressesString&include_24hr_change=true");
final coinGeckoResponse = await client.get(
uri,
headers: {'Content-Type': 'application/json'},
);
final coinGeckoData = jsonDecode(coinGeckoResponse.body) as Map;
for (final key in coinGeckoData.keys) {
final contractAddress = key as String;
final map = coinGeckoData[contractAddress] as Map;
final price = Decimal.parse(map[baseCurrency.toLowerCase()].toString());
final change24h = double.parse(
map["${baseCurrency.toLowerCase()}_24h_change"].toString());
tokenPrices[contractAddress] = Tuple2(price, change24h);
}
return tokenPrices;
} catch (e, s) {
Logging.instance.log(
"getPricesAnd24hChangeForEthTokens($baseCurrency,$contractAddresses): $e\n$s",
level: LogLevel.Error,
);
// return previous cached values
return tokenPrices;
}
}
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}