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Create cosmosSDK.cpp .engine subdirector file for future engine files for the SDK #23331
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creating an engine subdirectory for potential future .cpp engines such as the engineer for the SDK itself.
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📝 WalkthroughWalkthroughThe changes introduce a new implementation in the Cosmos SDK for handling reimbursements through a smart contract. This implementation defines a namespace for token denominations and structures for recipients and reimbursement messages. A contract class is created to process reimbursement requests, validating provided funds and generating bank send messages for multiple recipients. Changes
Sequence DiagramsequenceDiagram
participant Sender
participant Contract
participant Recipients
Sender->>Contract: Execute reimbursement
Contract->>Contract: Validate total funds
alt Sufficient Funds
Contract->>Recipients: Send microATOM to each recipient
Contract-->>Sender: Return success response
else Insufficient Funds
Contract-->>Sender: Throw runtime error
end
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Actionable comments posted: 1
🧹 Nitpick comments (5)
.engine/cosmosSDK.cpp (5)
22-25
: Handle potential integer overflow when calculatingtotal_amount
While summing up the amounts in
recipient.amount
, there's a theoretical risk of integer overflow if the total exceeds the maximum value foruint64_t
. Consider adding a safeguard to handle this rare but possible scenario.Apply this diff to include a check for overflow:
uint64_t total_amount = 0; for (const auto& recipient : msg.recipients) { + if (recipient.amount > UINT64_MAX - total_amount) { + throw std::runtime_error("Total amount exceeds maximum limit"); + } total_amount += recipient.amount; }
35-40
: Validate recipient addresses before creating messagesCurrently, there is no validation for
recipient.address
. If an invalid address is provided, the transaction may fail at a later stage. Consider adding validation to ensure that each recipient's address is in the correct format.Apply this diff to include address validation:
for (const auto& recipient : msg.recipients) { + if (!is_valid_address(recipient.address)) { + throw std::runtime_error("Invalid recipient address: " + recipient.address); + } bank_msgs.emplace_back(cosmwasm::BankMsg::Send{ recipient.address, {{ "uatom", recipient.amount }} }); } +// Helper function to validate addresses +bool is_valid_address(const std::string& address) { + // Implement address validation logic here + return !address.empty(); // Placeholder validation +}
38-38
: Parameterize the token denomination instead of hardcodingHardcoding the denomination as
"uatom"
limits the contract's flexibility. By parameterizing the denomination, the contract can support multiple token types, enhancing its reusability.Modify the
Recipient
structure and the code as follows:struct Recipient { std::string address; uint64_t amount; // Amount in microATOM + std::string denomination; }; struct ReimburseMsg { std::vector<Recipient> recipients; }; bank_msgs.emplace_back(cosmwasm::BankMsg::Send{ recipient.address, - {{ "uatom", recipient.amount }} + {{ recipient.denomination, recipient.amount }} });
29-31
: Enhance the error message for insufficient fundsProviding specific details in the error message can aid in debugging and inform users about the exact shortfall.
Apply this diff to improve the error message:
if (sent_amount < total_amount) { - throw std::runtime_error("Insufficient funds provided"); + throw std::runtime_error("Insufficient funds: required " + std::to_string(total_amount) + + ", but received " + std::to_string(sent_amount)); }
43-46
: Specify the contract's execution result clearlyAdding a result indicator in the response attributes can help in tracking and confirming successful executions.
Apply this diff to include a result attribute:
return cosmwasm::Response() .add_messages(bank_msgs) .add_attribute("action", "reimburse") .add_attribute("sender", info.sender) + .add_attribute("result", "success");
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- GitHub Check: Summary
adding in enhancements that were suggested
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Actionable comments posted: 3
🧹 Nitpick comments (1)
.engine/cosmosSDK.cpp (1)
1-3
: Add error handling include.Consider adding
<stdexcept>
for thestd::runtime_error
usage.#include <cosmwasm.hpp> #include <vector> #include <string> +#include <stdexcept>
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📓 Learnings (1)
.engine/cosmosSDK.cpp (1)
Learnt from: bearycool11
PR: cosmos/cosmos-sdk#23331
File: .engine/cosmosSDK.cpp:27-31
Timestamp: 2025-01-11T01:04:51.148Z
Learning: In Cosmos SDK C++ contracts, token denominations should be defined as constants to prevent typos and maintain consistency. Native tokens use their base denomination (e.g., "uatom"), while IBC-wrapped tokens follow the format "ibc/{hash}" where {hash} is the specific channel hash for that token's IBC connection.
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🔇 Additional comments (1)
.engine/cosmosSDK.cpp (1)
6-13
: Replace placeholder IBC hashes with actual channel hashes.The IBC token definitions are using placeholder hashes (e.g., "BTC_HASH", "ETH_HASH"). These should be replaced with the actual channel hashes for the specific IBC connections.
Additionally, consider adding documentation about token decimal places for each denomination to prevent calculation errors.
namespace denom { - const std::string ATOM = "uatom"; // Cosmos Hub token + const std::string ATOM = "uatom"; // Cosmos Hub token (1 ATOM = 1_000_000 uatom) - const std::string IBC_BTC = "ibc/BTC_HASH"; // IBC Bitcoin token + const std::string IBC_BTC = "ibc/ACTUAL_BTC_CHANNEL_HASH"; // IBC Bitcoin token (1 BTC = 1_00_000_000 sats) // ... similar changes for other tokens }Run this script to verify the correct IBC channel hashes:
#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())} }); } };
hopefully this is the final iteration of this...
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let's get through all the checks from start to finish...
best practices
alright, that's it, that's my final commit, that should do it. No more from me, that's just me throwing my hat into the ring. |
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just need for the rate limit to drop off here in a second, and this can be merged and finished for this work week.
Create .engine Subdirectory for Future .cpp Files in the SDK
Description
This PR introduces a new .engine subdirectory to house .cpp engine files. The purpose of this structure is to organize and support future additions to the SDK, such as advanced engines or reusable C++ contract components. The initial file, cosmosSDK.cpp, demonstrates contract logic using CosmWasm in C++.
Changes:
Added a new subdirectory: .engine/
Created cosmosSDK.cpp within the .engine/ directory, containing:
Contract logic for executing reimbursements.
Example usage of CosmWasm bank messages in C++.
Key Features of cosmosSDK.cpp:
Handles reimbursements to multiple recipients.
Validates sufficient funds before distributing.
Generates BankMsg::Send messages dynamically.
Issue Link
Author Checklist
All items are required. Please add a note to the item if not applicable and provide links to any relevant follow-up issues.
Included the correct type prefix:
feat for new functionality.
NOT CHECKED YET Updated CHANGELOG.md.
GOING TO DO THAT Reviewed and added comments to all critical changes.
WE'LL SEE Passed all CI checks.
Reviewers Checklist
All items are required. Add a note if not applicable and mark your name beside reviewed items.
Confirmed correct type prefix in PR title.
Verified all author checklist items were addressed.
Reviewed state machine logic, API design, and naming.
Ensured test coverage is sufficient for the changes.
Confirmed CI checks passed.
Additional Notes
This structure prepares the SDK for future enhancements using C++ and serves as a clean organizational model for developers contributing to engine-based modules. The cosmosSDK.cpp file is a foundational example of what's possible with CosmWasm and C++ integration.
EXAMPLE
Preview of Added File
.engine/cosmosSDK.cpp
cpp
Copy code
#include <cosmwasm.hpp>
#include
#include
// Recipient structure
struct Recipient {
std::string address;
uint64_t amount; // Amount in microATOM
};
// Input message
struct ReimburseMsg {
std::vector recipients;
};
// Main contract logic
class Contract : public cosmwasm::Contract {
public:
cosmwasm::Response execute(const cosmwasm::MessageInfo& info, const ReimburseMsg& msg) {
uint64_t total_amount = 0;
for (const auto& recipient : msg.recipients) {
total_amount += recipient.amount;
}
};
Let me know if you need this formatted or refined further! 🚀
Summary by CodeRabbit
New Features
Security Enhancements