Create cosmosSDK.cpp .engine subdirector file for future engine files for the SDK

.engine/cosmosSDK.cpp

@@ -0,0 +1,119 @@
+#include <cosmwasm.hpp>
+#include <vector>
+#include <string>
+#include <limits>
+
+// Token denomination constants
+namespace denom {
+    const std::string ATOM = "uatom";            // Cosmos Hub token
+    const std::string IBC_BTC = "ibc/BTC_HASH"; // IBC Bitcoin token
+    const std::string IBC_ETH = "ibc/ETH_HASH"; // IBC Ethereum token
+    const std::string OSMO = "ibc/OSMO_HASH";   // IBC Osmosis token
+    const std::string JUNO = "ibc/JUNO_HASH";   // IBC Juno token
+    const std::string STARS = "ibc/STARS_HASH"; // IBC Stargaze token
+}
+
+// Recipient structure
+struct Recipient {
+    std::string address;  // Recipient's wallet address
+    uint64_t amount;      // Amount to send (in microATOM or token denomination)
+
+    bool is_valid() const {
+        return !address.empty() && amount > 0;
+    }
+};
+
+// Input message structure
+struct ReimburseMsg {
+    std::vector<Recipient> recipients; // List of recipients with amounts
+
+    bool is_valid() const {
+        if (recipients.empty()) {
+            return false;
+        }
+        for (const auto& recipient : recipients) {
+            if (!recipient.is_valid()) {
+                return false;
+            }
+        }
+        return true;
+    }
+};
+
+// Main contract logic
+class Contract : public cosmwasm::Contract<Contract> {
+private:
+    // Helper to calculate the total amount required, with overflow protection
+    uint64_t calculate_total_amount(const std::vector<Recipient>& recipients) const {
+        uint64_t total = 0;
+        for (const auto& recipient : recipients) {
+            if (recipient.amount > std::numeric_limits<uint64_t>::max() - total) {
+                throw std::overflow_error("Total amount exceeds maximum uint64_t value");
+            }
+            total += recipient.amount;
+        }
+        return total;
+    }
+
+    // Helper to create bank messages for recipients
+    std::vector<cosmwasm::BankMsg> create_bank_msgs(
+        const std::vector<Recipient>& recipients,
+        const std::string& token_denom
+    ) const {
+        std::vector<cosmwasm::BankMsg> msgs;
+        msgs.reserve(recipients.size()); // Optimize vector growth
+
+        for (const auto& recipient : recipients) {
+            msgs.emplace_back(cosmwasm::BankMsg::Send{
+                recipient.address,
+                {{token_denom, recipient.amount}}
+            });
+        }
+        return msgs;
+    }
+
+public:
+    cosmwasm::Response execute(const cosmwasm::MessageInfo& info, const ReimburseMsg& msg) {
+        // Validate provided funds
+        if (info.funds.empty()) {
+            throw std::runtime_error("No funds provided");
+        }
+
+        const auto& token_denom = info.funds.at(0).denom;
+
+        // Validate token denomination (defaults to ATOM for now)
+        if (token_denom != denom::ATOM) {
+            throw std::runtime_error("Invalid token denomination: expected " + denom::ATOM);
+        }
+
+        // Validate message structure
+        if (!msg.is_valid()) {
+            throw std::runtime_error("Invalid recipients configuration");
+        }
+
+        uint64_t total_required = calculate_total_amount(msg.recipients);
+        uint64_t provided_funds = info.funds.at(0).amount;
+
+        if (provided_funds < total_required) {
+            throw std::runtime_error("Insufficient funds provided: required " + 
+                std::to_string(total_required) + ", got " + std::to_string(provided_funds));
+        }
+
+        // Generate BankMsg::Send messages for recipients
+        auto bank_msgs = create_bank_msgs(msg.recipients, token_denom);
+
+        // Create response with messages, attributes, and events
+        return cosmwasm::Response()
+            .add_messages(bank_msgs)
+            .add_attribute("action", "reimburse")
+            .add_attribute("sender", info.sender)
+            .add_attribute("total_amount", std::to_string(total_required))
+            .add_attribute("recipient_count", std::to_string(msg.recipients.size()))
+            .add_event("reimburse", {
+                {"sender", info.sender},
+                {"total_amount", std::to_string(total_required)},
+                {"denom", token_denom},
+                {"recipients", std::to_string(msg.recipients.size())}
+            });
+    }
+};