types: support eth hex address on accounts

CHANGELOG.md

@@ -39,6 +39,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Improvements
 
+* (types) [\#502](https://github.com/ChainSafe/ethermint/pull/502) `EthAccount` now also exposes the Ethereum hex address in `string` format to clients.
 * (types) [\#494](https://github.com/ChainSafe/ethermint/pull/494) Update `EthAccount` public key JSON type to `string`.
 * (app) [\#471](https://github.com/ChainSafe/ethermint/pull/471) Add `x/upgrade` module for managing software updates.
 * (`x/evm`) [\#458](https://github.com/ChainSafe/ethermint/pull/458) Define parameter for token denomination used for the EVM module.

docs/basics/accounts.md

@@ -42,9 +42,44 @@ clients. The hex format on the other hand, is the Ethereum `common.Address` repr
 Cosmos `sdk.AccAddress`.
 
 - Address (Bech32): `eth1crwhac03z2pcgu88jfnqnwu66xlthlz2rhljah`
-- Address (Hex): `0xc0dd7ee1f112838470e7926609bb9ad1bebbfc4a`
+- Address ([EIP55](https://eips.ethereum.org/EIPS/eip-55) Hex): `0xc0dd7ee1f112838470e7926609bb9ad1bebbfc4a`
 - Compressed Public Key (Bech32): `ethpub1pfqnmk6pqnwwuw0h9hj58t2hyzwvqc3truhhp5tl5hfucezcfy2rs8470nkyzju2vmk645fzmw2wveaqcqek767kwa0es9rmxe9nmmjq84cpny3fvj6tpg`
 
+You can query an account address using the Cosmos CLI or REST clients:
+
+```bash
+# NOTE: the --output (-o) flag will define the output format in JSON or YAML (text)
+ethermintcli q auth account $(ethermintcli keys show <MYKEY> -a) -o text
+|
+  address: eth1f8rqrfwut7ngkxwth0gt99h0lxnxsp09ngvzwl
+  eth_address: 0x49c601A5DC5FA68b19CBbbd0b296eFF9a66805e5
+  coins:
+  - denom: aphoton
+    amount: "1000000000000000000"
+  - denom: stake
+    amount: "999999999900000000"
+  public_key: ethpub1pfqnmkepqw45vpsn6dzvm7k22zrghx0nfewjdfacy7wyycv5evfk57kyhwr8cqj5r4x
+  account_number: 0
+  sequence: 1
+  code_hash: c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470
+```
+
+``` bash
+# GET /auth/accounts/{address}
+curl -X GET "<NODE_IP>/auth/accounts/eth1f8rqrfwut7ngkxwth0gt99h0lxnxsp09ngvzwl" -H "accept: application/json"
+```
+
+::: tip
+The Cosmos SDK Keyring output (i.e `ethermintcli keys`) only supports addresses and public keys in Bech32 format.
+:::
+
+To retrieve the Ethereum hex address using Web3, use the JSON-RPC `eth_accounts` endpoint:
+
+```bash
+# query against a local node
+curl -X POST --data '{"jsonrpc":"2.0","method":"eth_accounts","params":[],"id":1}' -H "Content-Type: application/json" http://localhost:26664
+```
+
 ## Next {hide}
 
 Learn about Ethermint [transactions](./transactions.md) {hide}

docs/quickstart/run_node.md

@@ -50,7 +50,8 @@ To run a node with the same key every time: replace `ethermintcli keys add $KEY`
 echo "your mnemonic here" | ethermintcli keys add $KEY --recover
 ```
 
-::: tip Ethermint currently only supports 24 word mnemonics.
+::: tip
+Ethermint currently only supports 24 word mnemonics.
 :::
 
 You can generate a new key/mnemonic with:

types/account.go

@@ -76,6 +76,7 @@ func (acc *EthAccount) SetBalance(amt sdk.Int) {
 
 type ethermintAccountPretty struct {
 	Address       sdk.AccAddress `json:"address" yaml:"address"`
+	EthAddress    string         `json:"eth_address" yaml:"eth_address"`
 	Coins         sdk.Coins      `json:"coins" yaml:"coins"`
 	PubKey        string         `json:"public_key" yaml:"public_key"`
 	AccountNumber uint64         `json:"account_number" yaml:"account_number"`
@@ -87,6 +88,7 @@ type ethermintAccountPretty struct {
 func (acc EthAccount) MarshalYAML() (interface{}, error) {
 	alias := ethermintAccountPretty{
 		Address:       acc.Address,
+		EthAddress:    acc.EthAddress().String(),
 		Coins:         acc.Coins,
 		AccountNumber: acc.AccountNumber,
 		Sequence:      acc.Sequence,
@@ -114,6 +116,7 @@ func (acc EthAccount) MarshalYAML() (interface{}, error) {
 func (acc EthAccount) MarshalJSON() ([]byte, error) {
 	alias := ethermintAccountPretty{
 		Address:       acc.Address,
+		EthAddress:    acc.EthAddress().String(),
 		Coins:         acc.Coins,
 		AccountNumber: acc.AccountNumber,
 		Sequence:      acc.Sequence,

types/account_test.go

@@ -75,14 +75,15 @@ func TestEthermintAccount_String(t *testing.T) {
 
 	accountStr := fmt.Sprintf(`|
   address: %s
+  eth_address: %s
   coins:
   - denom: aphoton
     amount: "1"
   public_key: %s
   account_number: 10
   sequence: 50
   code_hash: "0102"
-`, addr, bech32pubkey)
+`, addr, ethAcc.EthAddress().String(), bech32pubkey)
 
 	require.Equal(t, accountStr, ethAcc.String())