Initialize coin metadata in app4 and fmt

docs/core/examples/app1.go

@@ -179,7 +179,7 @@ func handleMsgSend(ctx sdk.Context, key *sdk.KVStoreKey, msg MsgSend) sdk.Result
 	store.Set(msg.To, val)
 
 	return sdk.Result{
-	// TODO: Tags
+		// TODO: Tags
 	}
 }
 

docs/core/examples/app2.go

@@ -1,14 +1,14 @@
 package app
 
 import (
-	"reflect"
 	"encoding/json"
 	"fmt"
+	"reflect"
 
+	"github.com/tendermint/go-crypto"
 	cmn "github.com/tendermint/tmlibs/common"
 	dbm "github.com/tendermint/tmlibs/db"
 	"github.com/tendermint/tmlibs/log"
-	"github.com/tendermint/go-crypto"
 
 	bapp "github.com/cosmos/cosmos-sdk/baseapp"
 	sdk "github.com/cosmos/cosmos-sdk/types"
@@ -63,10 +63,10 @@ func NewApp2(logger log.Logger, db dbm.DB) *bapp.BaseApp {
 
 // Coin Metadata
 type CoinMetadata struct {
-	TotalSupply sdk.Int
+	TotalSupply   sdk.Int
 	CurrentSupply sdk.Int
-	Issuer sdk.Address
-	Decimal uint64
+	Issuer        sdk.Address
+	Decimal       uint64
 }
 
 //------------------------------------------------------------------
@@ -75,13 +75,13 @@ type CoinMetadata struct {
 // Create Output struct to allow single message to issue arbitrary coins to multiple users
 type Output struct {
 	Address sdk.Address
-	Coins sdk.Coins
+	Coins   sdk.Coins
 }
 
 // Single permissioned issuer can issue multiple outputs
 // Implements sdk.Msg Interface
 type MsgIssue struct {
-	Issuer sdk.Address
+	Issuer  sdk.Address
 	Outputs []Output
 }
 
@@ -91,7 +91,7 @@ func (msg MsgIssue) Type() string { return "bank" }
 func (msg MsgIssue) ValidateBasic() sdk.Error {
 	if len(msg.Issuer) == 0 {
 		return sdk.ErrInvalidAddress("Issuer address cannot be empty")
-	} 
+	}
 
 	for _, o := range msg.Outputs {
 		if len(o.Address) == 0 {
@@ -152,10 +152,10 @@ func handleMsgIssue(ctx sdk.Context, keyMain *sdk.KVStoreKey, keyAcc *sdk.KVStor
 					return sdk.ErrInvalidCoins("Cannot issue that many new coins").Result()
 				}
 				metadata = CoinMetadata{
-					TotalSupply: sdk.NewInt(1000000),
+					TotalSupply:   sdk.NewInt(1000000),
 					CurrentSupply: sdk.NewInt(0),
-					Issuer: msg.Issuer,
-					Decimal: 10,
+					Issuer:        msg.Issuer,
+					Decimal:       10,
 				}
 			} else {
 				// Decode coin metadata

docs/core/examples/app3.go

@@ -1,9 +1,9 @@
 package app
 
 import (
-	"reflect"
 	"encoding/json"
 	"fmt"
+	"reflect"
 
 	cmn "github.com/tendermint/tmlibs/common"
 	dbm "github.com/tendermint/tmlibs/db"
@@ -13,7 +13,6 @@ import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/x/auth"
 	"github.com/cosmos/cosmos-sdk/x/bank"
-
 )
 
 const (
@@ -94,7 +93,7 @@ func betterHandleMsgIssue(ctx sdk.Context, metadataMapper MetaDataMapper, accoun
 				// coin doesn't have issuer yet, set issuer to msg issuer
 				metadata.Issuer = msg.Issuer
 			}
-			
+
 			// Check that msg Issuer is authorized to issue these coins
 			if !reflect.DeepEqual(metadata.Issuer, msg.Issuer) {
 				return sdk.ErrUnauthorized(fmt.Sprintf("Msg Issuer cannot issue these coins: %s", coin.Denom)).Result()
@@ -122,8 +121,6 @@ func betterHandleMsgIssue(ctx sdk.Context, metadataMapper MetaDataMapper, accoun
 	return sdk.Result{}
 }
 
-
-
 //------------------------------------------------------------------
 // Mapper for Coin Metadata
 // Example of a very simple user-defined mapper

docs/core/examples/app4.go

@@ -2,13 +2,13 @@ package app
 
 import (
 	"encoding/json"
-	"reflect"
 	"fmt"
+	"reflect"
 
+	abci "github.com/tendermint/abci/types"
 	cmn "github.com/tendermint/tmlibs/common"
 	dbm "github.com/tendermint/tmlibs/db"
 	"github.com/tendermint/tmlibs/log"
-	abci "github.com/tendermint/abci/types"
 
 	bapp "github.com/cosmos/cosmos-sdk/baseapp"
 	sdk "github.com/cosmos/cosmos-sdk/types"
@@ -59,8 +59,8 @@ func NewApp4(logger log.Logger, db dbm.DB) *bapp.BaseApp {
 }
 
 type GenesisState struct {
-	Accounts  []*GenesisAccount  `json:"accounts"`
-	Coins     []*GenesisCoin     `json:"coins"`
+	Accounts []*GenesisAccount `json:"accounts"`
+	Coins    []*GenesisCoin    `json:"coins"`
 }
 
 // GenesisAccount doesn't need pubkey or sequence
@@ -79,16 +79,17 @@ func (ga *GenesisAccount) ToAccount() (acc *auth.BaseAccount, err error) {
 
 // GenesisCoin enforces CurrentSupply is 0 at genesis.
 type GenesisCoin struct {
-	Issuer sdk.Address `json:"issuer"`
-	TotalSupply sdk.Int `json:"total_supply`
-	Decimal     uint64   `json:"decimals"`
+	Denom       string      `json:"denom"`
+	Issuer      sdk.Address `json:"issuer"`
+	TotalSupply sdk.Int     `json:"total_supply`
+	Decimal     uint64      `json:"decimals"`
 }
 
-func (gc *GenesisCoin) ToMetaData() CoinMetadata {
-	return CoinMetadata{
-		Issuer: gc.Issuer,
+func (gc *GenesisCoin) ToMetaData() (string, CoinMetadata) {
+	return gc.Denom, CoinMetadata{
+		Issuer:      gc.Issuer,
 		TotalSupply: gc.TotalSupply,
-		Decimal: gc.Decimal,
+		Decimal:     gc.Decimal,
 	}
 }
 
@@ -115,6 +116,12 @@ func NewInitChainer(cdc *wire.Codec, accountMapper auth.AccountMapper, metadataM
 			accountMapper.SetAccount(ctx, acc)
 		}
 
+		// Initialize coin metadata.
+		for _, gc := range genesisState.Coins {
+			denom, metadata := gc.ToMetaData()
+			metadataMapper.SetMetaData(ctx, denom, metadata)
+		}
+
 		return abci.ResponseInitChain{}
 
 	}
@@ -170,7 +177,6 @@ func evenBetterHandleMsgIssue(ctx sdk.Context, metadataMapper MetaDataMapper, ac
 	return sdk.Result{}
 }
 
-
 //---------------------------------------------------------------------------------------------
 // Simpler MetaDataMapper no longer able to initalize default CoinMetaData