Creating Transaction

Creating Templates Transaction Messages/Data

Using a Simple Flag:

--generate-only

Transaction templates form the foundation of blockchain development and automation in ENI. With the --generate-only flag and Foundry's cast tool, developers can create, analyze, and debug transactions in both native Cosmos and EVM environments. Understanding these tools unlocks powerful possibilities for building complex applications and development workflows.

Native Transaction Templates

The --generate-only flag transforms any ENI CLI transaction command into a template generator, creating a complete transaction structure without broadcasting it. These templates serve as building blocks for applications, frontends, and automation tools.

Basic Usage Pattern

The general pattern follows this structure:

enid tx <module> <action> <parameters> --from <key> --generate-only

For example, a token transfer template:

enid tx bank send \
  $(enid keys show sender -a) \
  $(enid keys show recipient -a) \
  1000000ueni \
  --from sender \
  --generate-only | jq

EVM Transaction Analysis

ENI's EVM compatibility introduces additional complexity when handling transactions. Let’s explore how to generate and analyze EVM transactions using ENI’s native tools and Foundry’s cast command.

Generating an EVM Transaction Template

To generate an EVM transaction template, use the evm module with --generate-only. Here’s an example of registering an EVM pointer:

enid tx evm register-evm-pointer NATIVE \
  factory/eni1ep3f207kt7julz9tjwxp2x8kluj0y9l6u0fume/gptw \
  --gas-fee-cap=100000000000 \
  --gas-limit=2500000 \
  --evm-rpc=https://rpc.eniac.network \
  --from tf \
  --generate-only

This command returns a transaction hash, which you can further analyze using Foundry’s cast tool.

Analyzing an EVM Transaction with Cast

Once you have the transaction hash, you can use Foundry’s cast command to inspect transaction details:

cast tx 0x5010e6600e67f04a9bc3d3b670a7c2de380b180713d9a014a5dbd76b7e2190f1 \
  --rpc-url=https://rpc.eniac.network

This provides detailed transaction information:

blockHash            0x4696d63a9a9ae88b03bcc94ccbd87f407e994b309d1dff9c0626de51ac57b76e
blockNumber          130076639
from                 0xAa55a16dD4E73c48C968928983c2bcC98d913d96
transactionIndex     7
effectiveGasPrice    100000000000
accessList           []
chainId              173
gasLimit             2500000
hash                 0x5010e6600e67f04a9bc3d3b670a7c2de380b180713d9a014a5dbd76b7e2190f1
input                0xc31d960f0000...
maxFeePerGas         100000000000
maxPriorityFeePerGas 100000000000
nonce                3
r                    0x92313277d1ffad9a18260303081671a2d40035016ac83740486dee916c964db7
s                    0x158de03cac836b1fad26770274cffdb06b0809961811eb0b66aebfff95186417
to                   0x000000000000000000000000000000000000100b
type                 2
value                0
yParity              1

Understanding EVM Transaction Components

Let’s break down the key components of an EVM transaction:

  • input: Encoded function call data

  • maxFeePerGas: Maximum total fee per unit of gas

  • maxPriorityFeePerGas: Maximum priority fee per unit of gas

  • gasLimit: Maximum gas allowed for the transaction

  • to: Target contract address

  • type: Transaction type (2 indicates an EIP-1559 transaction)

Practical Applications

Development Workflow

When developing applications that interact with native and EVM functionality:

async function analyzeTransaction(txHash) {
  // First, get the native transaction details
  const nativeTx = await fetch(`${eniRestEndpoint}/cosmos/tx/v1beta1/txs/${txHash}`).then((res) => res.json());

  // If it's an EVM transaction, get EVM details
  if (nativeTx.tx.body.messages[0]['@type'].includes('evm')) {
    const evmTx = await fetch(`${evmRpcEndpoint}`, {
      method: 'POST',
      body: JSON.stringify({
        jsonrpc: '2.0',
        method: 'eth_getTransactionByHash',
        params: [txHash],
        id: 1
      })
    }).then((res) => res.json());

    return {
      native: nativeTx,
      evm: evmTx
    };
  }

  return { native: nativeTx };
}

Template Generation for Different Transaction Types

Generate templates for various transaction types:

# Native governance proposal
enid tx gov submit-proposal param-change proposal.json \
  --from validator \
  --generate-only > native_template.json

# EVM contract interaction
enid tx evm send-tx \
  --evm-rpc=https://rpc.eniac.network \
  --gas-limit=2500000 \
  --from=mykey \
  --generate-only > evm_template.json

Best Practices

Transaction Analysis

When analyzing transactions:

  • Always validate both the native and EVM aspects of a transaction

  • Use cast to decode input data when dealing with EVM transactions

  • Track gas parameters on both layers

  • Monitor transaction status on both the native and EVM layers

Error Handling

Handle potential issues on both layers:

try {
  // Check native transaction status
  const nativeStatus = await checkNativeStatus(txHash);

  // If native succeeds but EVM fails, investigate the EVM layer
  if (nativeStatus.success) {
    const evmStatus = await checkEvmStatus(txHash);
    if (!evmStatus.success) {
      const evmError = await cast.call(['tx', txHash, '--rpc-url', evmRpcUrl]);
      console.error('EVM transaction failed:', evmError);
    }
  }
} catch (error) {
  console.error('Transaction analysis failed:', error);
}

Security

  • Keep private keys secure and never include them in templates

  • Use .env files or other environment variables whenever possible when dealing with hardcoded wallet keys or mnemonics

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