Decimal Go SDK

For detailed explanation on how things work, checkout the:

Install

go get bitbucket.org/decimalteam/dsc-go-sdk

Usage

You can see working example in example/main.go

I. Action

Actions are creating wallet, creating and sending transactions.

1. Create wallet

package ...

import (
    "fmt"

    dscWallet "bitbucket.org/decimalteam/dsc-go-sdk/wallet"
)

const (
    // PLEASE, DON'T USE THIS MNEMONIC OR ANY PUBLIC EXPOSED MNEMONIC IN MAINNET
    testMnemonicWords      = "repair furnace west loud peasant false six hockey poem tube now alien service phone hazard winter favorite away sand fuel describe version tragic vendor"
	testMnemonicPassphrase = ""
)

func main() {
    // Option 1. Generate private key (account) by mnemonic words (bip39)
    account, err := dscWallet.NewAccountFromMnemonicWords(testMnemonicWords, testMnemonicPassphrase)
	if err != nil {
		// Error handling
	}
    // Output: d01...
    fmt.Println(account.Address())

    ...
    // Option 2. Generate mnemonic for future use
    mnemonicObject err := NewMnemonic(testMnemonicPassphrase)
	if err != nil {
		// Error handling
	}    
    // print mnemonic words
    fmt.Println(mnemonicObject.Words())

    mnemonic := mnemonicObject.Words()
    account, err := dscWallet.NewAccountFromMnemonicWords(mnemonic, testMnemonicPassphrase)
    ...
}

2. Create and send transaction

To send transaction you need:

Create account (wallet) from known mnemonic
Create API instance for account binding
Bind account: set chan id, account number, account sequence (nonce)
Create transaction message
Sign transaction by account, send transaction
Verify transaction delivery for sync mode

package ...

import (
    "fmt"

    // Required imports
    dscApi "bitbucket.org/decimalteam/dsc-go-sdk/api"
    dscTx "bitbucket.org/decimalteam/dsc-go-sdk/tx"
    dscWallet "bitbucket.org/decimalteam/dsc-go-sdk/wallet"
    // optional cosmos sdk to work with sdk.Coin and math.Int
    "cosmossdk.io/math"
	sdk "github.com/cosmos/cosmos-sdk/types"
)

func main() {
    // 1. Create wallet (see above)
    account := ...

    // 2. Create API instance for account binding
    // A) gateway API
    // endpoints may be "https://testnet-gate.decimalchain.com/api"
    // "https://mainnet-gate.decimalchain.com/api"
    // Or you can use constans dscApi.MainnetGate, dscApi.TestnetGate, dscApi.DevnetGate,
    api := dscApi.NewAPI("https://testnet-gate.decimalchain.com/api/")
    api := dscApi.NewAPI(dscApi.TestnetGate)
    // B) direct node connection API
    api := dscApi.NewDirectAPI("localhost")
    api := dscApi.NewDirectAPIWithPorts("localhost", 26657, 1317)

    err := api.GetParameters()
    // ...error handling
    // now api has valid results for api.ChainID(), api.BaseCoin()

    // 3. Bind account
    accNumber, accSequence, err := api.GetAccountNumberAndSequence(account.Address())
    // ...error handling
    account = account.WithChainID(api.ChainID()).WithSequence(accSequence).WithAccountNumber(accNumber)

    // 4. Create transaction message
    // For possible transaction messages see tx/types.go and DSC source
	msg := dscTx.NewMsgSendCoin(
		account.SdkAddress(),
		sdk.NewCoin(api.BaseCoin(), dscApi.EtherToWei(math.NewInt(1))),
		receiverAddress,
	)
    // or you can use message type directly
    msg := dscTx.MsgSendCoin{
        Sender: account.Address(),
        Receiver: receiver,
        Coin: sdk.NewCoin(api.BaseCoin(), dscApi.EtherToWei(math.NewInt(1))),
    }

	tx, err := dscTx.BuildTransaction(
		account,
		[]sdk.Msg{msg},
		"some tx memo",
		// fee to pay for transaction
		// if amount = 0, amount will be calculated and collected automaticaly by validator
		sdk.NewCoin(api.BaseCoin(), sdk.NewInt(0)),
	)
    // ...error handling

    // 5. Sign and send
    err = tx.SignTransaction(account)
	// ...error handling
	bz, err := tx.BytesToSend()
	// ...error handling

    // use one of methods:
	// 1) BroadcastTxSync: send transaction in SYNC mode and get transaction hash and
	// possible error of transaction check
	// You can check later transaction delivery by hash
    result, err := api.BroadcastTxSync(bz)
	// 2) BroadcastTxCommit (only for DirectAPI): same as BroadcastTxSync, but wait
	// for delivery at end of block (about 5 seconds); return final result of transaction
    result, err := api.BroadcastTxCommit(bz)

    // only gate API
    // wait for block when using BroadcastTxSync
    // 6. Verify transaction delivery
    // NOTE: if transaction not in block already, you can get HTTP 404 error
    // If you want to be sure after every transaction, use BroadcastTxCommit
    time.Sleep(time.Second * 6)
    txInfo, err := api.GetTxByHash(result.Hash)
    // ...error handling
}

II. Decode transaction (only gateway API)

You can get and decode any transaction by using DscAPI.DecodeTransaction(hexHash).

package ...

import (
    "fmt"

    // Required imports
    dscApi "bitbucket.org/decimalteam/dsc-go-sdk/api"
    dscTx "bitbucket.org/decimalteam/dsc-go-sdk/tx"
    dscWallet "bitbucket.org/decimalteam/dsc-go-sdk/wallet"
    // optional cosmos sdk to work with sdk.Coin and math.Int
	sdk "github.com/cosmos/cosmos-sdk/types"
)

/* type declared in dscApi package
type TxDecoded struct {
	Msg  sdk.Msg  // transaction message
	Memo string   // transaction memo
	Fee  sdk.Coin // payed fee
	// error info
	Code      int    // error code, 0 - no errors
	Codespace string // codespace if code > 0
}
*/

func main() {
    api := dscApi.NewAPI(...)
    txDecoded, err := api.DecodeTransaction("HEXHASH")
    // ...error handling
	msg, ok := txDecoded.Msg.(*dscTx.MsgSendCoin)
	if !ok {
		fmt.Printf("it's not MsgSendCoin")
		return
	}
	fmt.Printf("sender: %s\n", msg.Sender)
	fmt.Printf("recipient: %s\n", msg.Recipient)
	fmt.Printf("coin: %s\n", msg.Coin)
    fmt.Printf("memo: %s\n", txDecoded.Memo)
    fmt.Printf("fee: %s\n", txDecoded.Fee)
}

III. Views (only gateway API)

To get some information about blocks, transactions, accounts, etc use GetXXX methods.

All GetXXX methods declared in api/endpoint.go, return types declared in api/types.go

OptionalParams is structure with fields Limit and Offset. opt *OptionalParams can be nil. If opt *OptionalParams is not nil, GetXXX gets part of data, specified by Limit and Offset.

List of known methods:

GetAddress(id string) (*AddressInfo, error)
GetNFTCollection(collection string) (interface{}, error)
GetNFTTransactions(collection string, id string, opt *OptionalParams) ([]TxInfo, error)
GetTxByHash(hash string) (*TxInfo, error)
GetTxs(opt *OptionalParams) ([]TxInfo, error)
GetCoins(opt *OptionalParams) ([]CoinInfo, error)
GetCoin(coin string) (*CoinInfo, error)
GetBlocks(opt *OptionalParams) ([]BlockInfo, error)
GetBlockByHeight(height uint64) (*BlockInfo, error)
GetBlockTransactions(height uint64) ([]TxInfo, error)
GetEvmContracts(opt *OptionalParams) ([]EvmContract, error)
GetEvmTransactions(opt *OptionalParams) ([]EvmTransaction, error)
GetEvmAccounts(opt *OptionalParams) ([]EvmAccount, error)
GetEvmContract(address string) (*EvmContract, error)
GetEvmTransaction(hash string) (*EvmTransaction, error)
GetEvmAccount(address string) (*EvmAccount, error)
GetEvmContractTransactions(address string, opt *OptionalParams) ([]EvmTransaction, error)
GetEvmContractEvents(address string, opt *OptionalParams) ([]EvmEvent, error)
GetEvmAccountBalances(address string, opt *OptionalParams) ([]EvmAccountBalance, error)
GetValidatorsByKind(kind string) ([]Validator, error)
GetValidator(address string) (*Validator, error)
GetValidatorStakes(address string, opt *OptionalParams) ([]ValidatorStake, error)
GetValidatorStakesNFT(address string) ([]ValidatorStakeNFT, error)

Null-nil/dsc-go-sdk