Add selectable solo and MM mining backends

lib/miningBackends.js

@@ -0,0 +1,87 @@
+function getLegacySoloBackend() {
+	return {
+		name: 'solo',
+		type: 'solo',
+		host: (config.miningSource && config.miningSource.host) || config.daemon.host,
+		port: (config.miningSource && config.miningSource.port) || config.daemon.port,
+		alwaysPoll: (config.miningSource && config.miningSource.alwaysPoll) || config.daemon.alwaysPoll || false,
+		walletAddress: null
+	};
+}
+
+function getConfiguredBackends() {
+	if (!config.mining || !config.mining.backends) {
+		return null;
+	}
+	return config.mining.backends;
+}
+
+function getActiveBackendName(backends) {
+	if (config.mining && config.mining.active) {
+		return config.mining.active;
+	}
+
+	let enabled = Object.keys(backends).filter(function (name) {
+		return backends[name] && backends[name].enabled;
+	});
+
+	if (enabled.length === 0) {
+		throw new Error('No enabled mining backend configured');
+	}
+
+	return enabled[0];
+}
+
+function normalizeBackend(name, backend) {
+	return {
+		name: name,
+		type: backend.type || (name === 'solo' ? 'solo' : 'merge-mining'),
+		parentCoin: backend.parentCoin || null,
+		host: backend.host,
+		port: backend.port,
+		alwaysPoll: backend.alwaysPoll || false,
+		walletAddress: backend.walletAddress || null
+	};
+}
+
+function getActiveMiningBackend() {
+	let backends = getConfiguredBackends();
+	if (!backends) {
+		return getLegacySoloBackend();
+	}
+
+	let activeName = getActiveBackendName(backends);
+	let backend = backends[activeName];
+	if (!backend) {
+		throw new Error('Active mining backend "' + activeName + '" is not defined');
+	}
+	if (!backend.enabled) {
+		throw new Error('Active mining backend "' + activeName + '" is disabled');
+	}
+	if (!backend.host || !backend.port) {
+		throw new Error('Active mining backend "' + activeName + '" is missing host/port');
+	}
+
+	return normalizeBackend(activeName, backend);
+}
+exports.getActiveMiningBackend = getActiveMiningBackend;
+
+function getMiningRpcConfig() {
+	let backend = getActiveMiningBackend();
+	return {
+		host: backend.host,
+		port: backend.port
+	};
+}
+exports.getMiningRpcConfig = getMiningRpcConfig;
+
+function getMiningTemplateAddress(defaultAddress) {
+	let backend = getActiveMiningBackend();
+	return backend.walletAddress || defaultAddress;
+}
+exports.getMiningTemplateAddress = getMiningTemplateAddress;
+
+function isSoloMiningBackend() {
+	return getActiveMiningBackend().type === 'solo';
+}
+exports.isSoloMiningBackend = isSoloMiningBackend;