Merge PR #2275: genesis: Ensure there are no duplicate accounts in genesis file

This also contains a light refactor of genesis state parsing, so that
the tests file didn't duplicate a lot of this code.

PENDING.md

@@ -95,6 +95,7 @@ IMPROVEMENTS
     * [x/auth] Signature verification's gas cost now accounts for pubkey type. [#2046](https://github.com/tendermint/tendermint/pull/2046)
     * [x/stake] [x/slashing] Ensure delegation invariants to jailed validators [#1883](https://github.com/cosmos/cosmos-sdk/issues/1883).
     * [x/stake] Improve speed of GetValidator, which was shown to be a performance bottleneck. [#2046](https://github.com/tendermint/tendermint/pull/2200)
+    * [genesis] \#2229 Ensure that there are no duplicate accounts in the genesis state.
 * SDK
     * [tools] Make get_vendor_deps deletes `.vendor-new` directories, in case scratch files are present.
     * [spec] Added simple piggy bank distribution spec

cmd/gaia/app/app.go

@@ -190,6 +190,11 @@ func (app *GaiaApp) initChainer(ctx sdk.Context, req abci.RequestInitChain) abci
 	slashing.InitGenesis(ctx, app.slashingKeeper, genesisState.StakeData)
 
 	gov.InitGenesis(ctx, app.govKeeper, genesisState.GovData)
+	err = GaiaValidateGenesisState(genesisState)
+	if err != nil {
+		// TODO find a way to do this w/o panics
+		panic(err)
+	}
 
 	return abci.ResponseInitChain{
 		Validators: validators,

cmd/gaia/app/genesis.go

@@ -180,17 +180,25 @@ func GaiaAppGenState(cdc *wire.Codec, appGenTxs []json.RawMessage) (genesisState
 		}
 
 		// create the genesis account, give'm few steaks and a buncha token with there name
-		accAuth := auth.NewBaseAccountWithAddress(genTx.Address)
-		accAuth.Coins = sdk.Coins{
-			{genTx.Name + "Token", sdk.NewInt(1000)},
-			{"steak", freeFermionsAcc},
-		}
-		acc := NewGenesisAccount(&accAuth)
-		genaccs[i] = acc
+		genaccs[i] = genesisAccountFromGenTx(genTx)
 		stakeData.Pool.LooseTokens = stakeData.Pool.LooseTokens.Add(sdk.NewDecFromInt(freeFermionsAcc)) // increase the supply
 
 		// add the validator
 		if len(genTx.Name) > 0 {
+			stakeData = addValidatorToStakeData(genTx, stakeData)
+		}
+	}
+
+	// create the final app state
+	genesisState = GenesisState{
+		Accounts:  genaccs,
+		StakeData: stakeData,
+		GovData:   gov.DefaultGenesisState(),
+	}
+	return
+}
+
+func addValidatorToStakeData(genTx GaiaGenTx, stakeData stake.GenesisState) stake.GenesisState {
 	desc := stake.NewDescription(genTx.Name, "", "", "")
 	validator := stake.NewValidator(
 		sdk.ValAddress(genTx.Address), sdk.MustGetConsPubKeyBech32(genTx.PubKey), desc,
@@ -212,14 +220,40 @@ func GaiaAppGenState(cdc *wire.Codec, appGenTxs []json.RawMessage) (genesisState
 	}
 
 	stakeData.Bonds = append(stakeData.Bonds, delegation)
-		}
+	return stakeData
 }
 
-	// create the final app state
-	genesisState = GenesisState{
-		Accounts:  genaccs,
-		StakeData: stakeData,
-		GovData:   gov.DefaultGenesisState(),
+func genesisAccountFromGenTx(genTx GaiaGenTx) GenesisAccount {
+	accAuth := auth.NewBaseAccountWithAddress(genTx.Address)
+	accAuth.Coins = sdk.Coins{
+		{genTx.Name + "Token", sdk.NewInt(1000)},
+		{"steak", freeFermionsAcc},
+	}
+	return NewGenesisAccount(&accAuth)
+}
+
+// GaiaValidateGenesisState ensures that the genesis state obeys the expected invariants
+// TODO: No validators are both bonded and revoked (#2088)
+// TODO: Error if there is a duplicate validator (#1708)
+// TODO: Ensure all state machine parameters are in genesis (#1704)
+func GaiaValidateGenesisState(genesisState GenesisState) (err error) {
+	err = validateGenesisStateAccounts(genesisState.Accounts)
+	if err != nil {
+		return
+	}
+	return
+}
+
+// Ensures that there are no duplicate accounts in the genesis state,
+func validateGenesisStateAccounts(accs []GenesisAccount) (err error) {
+	addrMap := make(map[string]bool, len(accs))
+	for i := 0; i < len(accs); i++ {
+		acc := accs[i]
+		strAddr := string(acc.Address)
+		if _, ok := addrMap[strAddr]; ok {
+			return fmt.Errorf("Duplicate account in genesis state: Address %v", acc.Address)
+		}
+		addrMap[strAddr] = true
 	}
 	return
 }

cmd/gaia/app/genesis_test.go

@@ -5,10 +5,36 @@ import (
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/x/auth"
+	"github.com/cosmos/cosmos-sdk/x/gov"
+	stake "github.com/cosmos/cosmos-sdk/x/stake"
 	"github.com/stretchr/testify/require"
 	"github.com/tendermint/tendermint/crypto/ed25519"
 )
 
+func makeGenesisState(genTxs []GaiaGenTx) GenesisState {
+	// start with the default staking genesis state
+	stakeData := stake.DefaultGenesisState()
+
+	// get genesis flag account information
+	genaccs := make([]GenesisAccount, len(genTxs))
+	for i, genTx := range genTxs {
+		genaccs[i] = genesisAccountFromGenTx(genTx)
+		stakeData.Pool.LooseTokens = stakeData.Pool.LooseTokens.Add(sdk.NewDecFromInt(freeFermionsAcc)) // increase the supply
+
+		// add the validator
+		if len(genTx.Name) > 0 {
+			stakeData = addValidatorToStakeData(genTx, stakeData)
+		}
+	}
+
+	// create the final app state
+	return GenesisState{
+		Accounts:  genaccs,
+		StakeData: stakeData,
+		GovData:   gov.DefaultGenesisState(),
+	}
+}
+
 func TestToAccount(t *testing.T) {
 	priv := ed25519.GenPrivKey()
 	addr := sdk.AccAddress(priv.PubKey().Address())
@@ -34,3 +60,16 @@ func TestGaiaAppGenState(t *testing.T) {
 	// TODO test with both one and two genesis transactions:
 	// TODO        correct: genesis account created, canididates created, pool token variance
 }
+
+func TestGaiaGenesisValidation(t *testing.T) {
+	genTxs := make([]GaiaGenTx, 2)
+	privKey := ed25519.GenPrivKey()
+	pubKey := privKey.PubKey()
+	addr := pubKey.Address()
+	// Test duplicate accounts fails
+	genTxs[0] = GaiaGenTx{"", sdk.AccAddress(addr), ""}
+	genTxs[1] = GaiaGenTx{"", sdk.AccAddress(addr), ""}
+	genesisState := makeGenesisState(genTxs)
+	err := GaiaValidateGenesisState(genesisState)
+	require.NotNil(t, err)
+}