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Add example of how to use spl-token from Solidity
Signed-off-by: Sean Young <[email protected]>
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| Parity Substrate | ||
| ________________ | ||
| ================ | ||
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| Solang works with Parity Substrate 2.0 or later. | ||
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| import 'solana'; | ||
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| library SplToken { | ||
| address constant tokenProgramId = address"TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA"; | ||
| enum TokenInstruction { | ||
| InitializeMint, // 0 | ||
| InitializeAccount, // 1 | ||
| InitializeMultisig, // 2 | ||
| Transfer, // 3 | ||
| Approve, // 4 | ||
| Revoke, // 5 | ||
| SetAuthority, // 6 | ||
| MintTo, // 7 | ||
| Burn, // 8 | ||
| CloseAccount, // 9 | ||
| FreezeAccount, // 10 | ||
| ThawAccount, // 11 | ||
| TransferChecked, // 12 | ||
| ApproveChecked, // 13 | ||
| MintToChecked, // 14 | ||
| BurnChecked, // 15 | ||
| InitializeAccount2, // 16 | ||
| SyncNative, // 17 | ||
| InitializeAccount3, // 18 | ||
| InitializeMultisig2, // 19 | ||
| InitializeMint2, // 20 | ||
| GetAccountDataSize, // 21 | ||
| InitializeImmutableOwner, // 22 | ||
| AmountToUiAmount, // 23 | ||
| UiAmountToAmount, // 24 | ||
| InitializeMintCloseAuthority, // 25 | ||
| TransferFeeExtension, // 26 | ||
| ConfidentialTransferExtension, // 27 | ||
| DefaultAccountStateExtension, // 28 | ||
| Reallocate, // 29 | ||
| MemoTransferExtension, // 30 | ||
| CreateNativeMint // 31 | ||
| } | ||
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| /// Mint new tokens. The transaction should be signed by the mint authority keypair | ||
| /// | ||
| /// @param mint the account of the mint | ||
| /// @param account the token account where the minted tokens should go | ||
| /// @param authority the public key of the mint authority | ||
| /// @param amount the amount of tokens to mint | ||
| function mint_to(address mint, address account, address authority, uint64 amount) internal { | ||
| bytes instr = new bytes(9); | ||
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| instr[0] = uint8(TokenInstruction.MintTo); | ||
| instr.writeUint64LE(amount, 1); | ||
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| AccountMeta[3] metas = [ | ||
| AccountMeta({pubkey: mint, is_writable: true, is_signer: false}), | ||
| AccountMeta({pubkey: account, is_writable: true, is_signer: false}), | ||
| AccountMeta({pubkey: authority, is_writable: true, is_signer: true}) | ||
| ]; | ||
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| tokenProgramId.call{accounts: metas}(instr); | ||
| } | ||
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| /// Transfer @amount token from @from to @to. The transaction should be signed by the owner | ||
| /// keypair of the from account. | ||
| /// | ||
| /// @param from the account to transfer tokens from | ||
| /// @param to the account to transfer tokens to | ||
| /// @param owner the publickey of the from account owner keypair | ||
| /// @param amount the amount to transfer | ||
| function transfer(address from, address to, address owner, uint64 amount) internal { | ||
| bytes instr = new bytes(9); | ||
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| instr[0] = uint8(TokenInstruction.Transfer); | ||
| instr.writeUint64LE(amount, 1); | ||
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| AccountMeta[3] metas = [ | ||
| AccountMeta({pubkey: from, is_writable: true, is_signer: false}), | ||
| AccountMeta({pubkey: to, is_writable: true, is_signer: false}), | ||
| AccountMeta({pubkey: owner, is_writable: true, is_signer: true}) | ||
| ]; | ||
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| tokenProgramId.call{accounts: metas}(instr); | ||
| } | ||
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| /// Burn @amount tokens in account. This transaction should be signed by the owner. | ||
| /// | ||
| /// @param account the acount for which tokens should be burned | ||
| /// @param mint the mint for this token | ||
| /// @param owner the publickey of the account owner keypair | ||
| /// @param amount the amount to transfer | ||
| function burn(address account, address mint, address owner, uint64 amount) internal { | ||
| bytes instr = new bytes(9); | ||
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| instr[0] = uint8(TokenInstruction.Burn); | ||
| instr.writeUint64LE(amount, 1); | ||
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| AccountMeta[3] metas = [ | ||
| AccountMeta({pubkey: account, is_writable: true, is_signer: false}), | ||
| AccountMeta({pubkey: mint, is_writable: true, is_signer: false}), | ||
| AccountMeta({pubkey: owner, is_writable: true, is_signer: true}) | ||
| ]; | ||
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| tokenProgramId.call{accounts: metas}(instr); | ||
| } | ||
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| /// Approve an amount to a delegate. This transaction should be signed by the owner | ||
| /// | ||
| /// @param account the account for which a delegate should be approved | ||
| /// @param delegate the delegate publickey | ||
| /// @param owner the publickey of the account owner keypair | ||
| /// @param amount the amount to approve | ||
| function approve(address account, address delegate, address owner, uint64 amount) internal { | ||
| bytes instr = new bytes(9); | ||
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| instr[0] = uint8(TokenInstruction.Approve); | ||
| instr.writeUint64LE(amount, 1); | ||
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| AccountMeta[3] metas = [ | ||
| AccountMeta({pubkey: account, is_writable: true, is_signer: false}), | ||
| AccountMeta({pubkey: delegate, is_writable: false, is_signer: false}), | ||
| AccountMeta({pubkey: owner, is_writable: false, is_signer: true}) | ||
| ]; | ||
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| tokenProgramId.call{accounts: metas}(instr); | ||
| } | ||
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| /// Revoke a previously approved delegate. This transaction should be signed by the owner. After | ||
| /// this transaction, no delgate is approved for any amount. | ||
| /// | ||
| /// @param account the account for which a delegate should be approved | ||
| /// @param owner the publickey of the account owner keypair | ||
| function revoke(address account, address owner) internal { | ||
| bytes instr = new bytes(1); | ||
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| instr[0] = uint8(TokenInstruction.Revoke); | ||
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| AccountMeta[2] metas = [ | ||
| AccountMeta({pubkey: account, is_writable: true, is_signer: false}), | ||
| AccountMeta({pubkey: owner, is_writable: false, is_signer: true}) | ||
| ]; | ||
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| tokenProgramId.call{accounts: metas}(instr); | ||
| } | ||
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| /// Get the total supply for the mint, i.e. the total amount in circulation | ||
| /// @param mint the mint for this token | ||
| function total_supply(address mint) internal view returns (uint64) { | ||
| AccountInfo account = get_account_info(mint); | ||
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| return account.data.readUint64LE(36); | ||
| } | ||
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| /// Get the balance for an account. | ||
| /// | ||
| /// @param account the account for which we want to know a balance | ||
| function get_balance(address account) internal view returns (uint64) { | ||
| AccountInfo ai = get_account_info(account); | ||
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| return ai.data.readUint64LE(64); | ||
| } | ||
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| /// Get the account info for an account. This walks the transaction account infos | ||
| /// and find the account info, or the transaction fails. | ||
| /// | ||
| /// @param account the account for which we want to have the acount info. | ||
| function get_account_info(address account) internal view returns (AccountInfo) { | ||
| for (uint64 i = 0; i < tx.accounts.length; i++) { | ||
| AccountInfo ai = tx.accounts[i]; | ||
| if (ai.key == account) { | ||
| return ai; | ||
| } | ||
| } | ||
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| revert("account missing"); | ||
| } | ||
| } |
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