multistore to persist data and a router to handle transactions.
Here is a simplified view of how transactions are handled by an application built on top of the Cosmos SDK when transferred from CometBFT via DeliverTx:
- Decode
transactionsreceived from the CometBFT consensus engine (remember that CometBFT only deals with[]bytes). - Extract
messagesfromtransactionsand do basic sanity checks. - Route each message to the appropriate module so that it can be processed.
- Commit state changes.
baseapp
baseapp is the boilerplate implementation of a Cosmos SDK application. It comes with an implementation of the ABCI to handle the connection with the underlying consensus engine. Typically, a Cosmos SDK application extends baseapp by embedding it in app.go.
Here is an example of this from simapp, the Cosmos SDK demonstration app:
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/go:build app_v1
package simapp
import (
"encoding/json"
"io"
"os"
"path/filepath"
autocliv1 "cosmossdk.io/api/cosmos/autocli/v1"
reflectionv1 "cosmossdk.io/api/cosmos/reflection/v1"
"github.com/spf13/cast"
abci "github.com/tendermint/tendermint/abci/types"
"github.com/tendermint/tendermint/libs/log"
dbm "github.com/tendermint/tm-db"
simappparams "cosmossdk.io/simapp/params"
"github.com/cosmos/cosmos-sdk/baseapp"
"github.com/cosmos/cosmos-sdk/client"
"github.com/cosmos/cosmos-sdk/client/flags"
nodeservice "github.com/cosmos/cosmos-sdk/client/grpc/node"
"github.com/cosmos/cosmos-sdk/client/grpc/tmservice"
"github.com/cosmos/cosmos-sdk/codec"
"github.com/cosmos/cosmos-sdk/codec/types"
"github.com/cosmos/cosmos-sdk/runtime"
runtimeservices "github.com/cosmos/cosmos-sdk/runtime/services"
"github.com/cosmos/cosmos-sdk/server"
"github.com/cosmos/cosmos-sdk/server/api"
"github.com/cosmos/cosmos-sdk/server/config"
servertypes "github.com/cosmos/cosmos-sdk/server/types"
"github.com/cosmos/cosmos-sdk/std"
"github.com/cosmos/cosmos-sdk/store/streaming"
storetypes "github.com/cosmos/cosmos-sdk/store/types"
"github.com/cosmos/cosmos-sdk/testutil/testdata_pulsar"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/types/module"
"github.com/cosmos/cosmos-sdk/version"
"github.com/cosmos/cosmos-sdk/x/auth"
"github.com/cosmos/cosmos-sdk/x/auth/ante"
authkeeper "github.com/cosmos/cosmos-sdk/x/auth/keeper"
"github.com/cosmos/cosmos-sdk/x/auth/posthandler"
authsims "github.com/cosmos/cosmos-sdk/x/auth/simulation"
authtx "github.com/cosmos/cosmos-sdk/x/auth/tx"
authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
"github.com/cosmos/cosmos-sdk/x/auth/vesting"
vestingtypes "github.com/cosmos/cosmos-sdk/x/auth/vesting/types"
"github.com/cosmos/cosmos-sdk/x/authz"
authzkeeper "github.com/cosmos/cosmos-sdk/x/authz/keeper"
authzmodule "github.com/cosmos/cosmos-sdk/x/authz/module"
"github.com/cosmos/cosmos-sdk/x/bank"
bankkeeper "github.com/cosmos/cosmos-sdk/x/bank/keeper"
banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
"github.com/cosmos/cosmos-sdk/x/capability"
capabilitykeeper "github.com/cosmos/cosmos-sdk/x/capability/keeper"
capabilitytypes "github.com/cosmos/cosmos-sdk/x/capability/types"
consensus "github.com/cosmos/cosmos-sdk/x/consensus"
consensusparamkeeper "github.com/cosmos/cosmos-sdk/x/consensus/keeper"
consensusparamtypes "github.com/cosmos/cosmos-sdk/x/consensus/types"
"github.com/cosmos/cosmos-sdk/x/crisis"
crisiskeeper "github.com/cosmos/cosmos-sdk/x/crisis/keeper"
crisistypes "github.com/cosmos/cosmos-sdk/x/crisis/types"
distr "github.com/cosmos/cosmos-sdk/x/distribution"
distrkeeper "github.com/cosmos/cosmos-sdk/x/distribution/keeper"
distrtypes "github.com/cosmos/cosmos-sdk/x/distribution/types"
"github.com/cosmos/cosmos-sdk/x/evidence"
evidencekeeper "github.com/cosmos/cosmos-sdk/x/evidence/keeper"
evidencetypes "github.com/cosmos/cosmos-sdk/x/evidence/types"
"github.com/cosmos/cosmos-sdk/x/feegrant"
feegrantkeeper "github.com/cosmos/cosmos-sdk/x/feegrant/keeper"
feegrantmodule "github.com/cosmos/cosmos-sdk/x/feegrant/module"
"github.com/cosmos/cosmos-sdk/x/genutil"
genutiltypes "github.com/cosmos/cosmos-sdk/x/genutil/types"
"github.com/cosmos/cosmos-sdk/x/gov"
govclient "github.com/cosmos/cosmos-sdk/x/gov/client"
govkeeper "github.com/cosmos/cosmos-sdk/x/gov/keeper"
govtypes "github.com/cosmos/cosmos-sdk/x/gov/types"
govv1 "github.com/cosmos/cosmos-sdk/x/gov/types/v1"
govv1beta1 "github.com/cosmos/cosmos-sdk/x/gov/types/v1beta1"
"github.com/cosmos/cosmos-sdk/x/group"
groupkeeper "github.com/cosmos/cosmos-sdk/x/group/keeper"
groupmodule "github.com/cosmos/cosmos-sdk/x/group/module"
"github.com/cosmos/cosmos-sdk/x/mint"
mintkeeper "github.com/cosmos/cosmos-sdk/x/mint/keeper"
minttypes "github.com/cosmos/cosmos-sdk/x/mint/types"
"github.com/cosmos/cosmos-sdk/x/nft"
nftkeeper "github.com/cosmos/cosmos-sdk/x/nft/keeper"
nftmodule "github.com/cosmos/cosmos-sdk/x/nft/module"
"github.com/cosmos/cosmos-sdk/x/params"
paramsclient "github.com/cosmos/cosmos-sdk/x/params/client"
paramskeeper "github.com/cosmos/cosmos-sdk/x/params/keeper"
paramstypes "github.com/cosmos/cosmos-sdk/x/params/types"
paramproposal "github.com/cosmos/cosmos-sdk/x/params/types/proposal"
"github.com/cosmos/cosmos-sdk/x/slashing"
slashingkeeper "github.com/cosmos/cosmos-sdk/x/slashing/keeper"
slashingtypes "github.com/cosmos/cosmos-sdk/x/slashing/types"
"github.com/cosmos/cosmos-sdk/x/staking"
stakingkeeper "github.com/cosmos/cosmos-sdk/x/staking/keeper"
stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types"
"github.com/cosmos/cosmos-sdk/x/upgrade"
upgradeclient "github.com/cosmos/cosmos-sdk/x/upgrade/client"
upgradekeeper "github.com/cosmos/cosmos-sdk/x/upgrade/keeper"
upgradetypes "github.com/cosmos/cosmos-sdk/x/upgrade/types"
)
const appName = "SimApp"
var (
/ DefaultNodeHome default home directories for the application daemon
DefaultNodeHome string
/ ModuleBasics defines the module BasicManager is in charge of setting up basic,
/ non-dependant module elements, such as codec registration
/ and genesis verification.
ModuleBasics = module.NewBasicManager(
auth.AppModuleBasic{
},
genutil.NewAppModuleBasic(genutiltypes.DefaultMessageValidator),
bank.AppModuleBasic{
},
capability.AppModuleBasic{
},
staking.AppModuleBasic{
},
mint.AppModuleBasic{
},
distr.AppModuleBasic{
},
gov.NewAppModuleBasic(
[]govclient.ProposalHandler{
paramsclient.ProposalHandler,
upgradeclient.LegacyProposalHandler,
upgradeclient.LegacyCancelProposalHandler,
},
),
params.AppModuleBasic{
},
crisis.AppModuleBasic{
},
slashing.AppModuleBasic{
},
feegrantmodule.AppModuleBasic{
},
upgrade.AppModuleBasic{
},
evidence.AppModuleBasic{
},
authzmodule.AppModuleBasic{
},
groupmodule.AppModuleBasic{
},
vesting.AppModuleBasic{
},
nftmodule.AppModuleBasic{
},
consensus.AppModuleBasic{
},
)
/ module account permissions
maccPerms = map[string][]string{
authtypes.FeeCollectorName: nil,
distrtypes.ModuleName: nil,
minttypes.ModuleName: {
authtypes.Minter
},
stakingtypes.BondedPoolName: {
authtypes.Burner, authtypes.Staking
},
stakingtypes.NotBondedPoolName: {
authtypes.Burner, authtypes.Staking
},
govtypes.ModuleName: {
authtypes.Burner
},
nft.ModuleName: nil,
}
)
var (
_ runtime.AppI = (*SimApp)(nil)
_ servertypes.Application = (*SimApp)(nil)
)
/ SimApp extends an ABCI application, but with most of its parameters exported.
/ They are exported for convenience in creating helper functions, as object
/ capabilities aren't needed for testing.
type SimApp struct {
*baseapp.BaseApp
legacyAmino *codec.LegacyAmino
appCodec codec.Codec
txConfig client.TxConfig
interfaceRegistry types.InterfaceRegistry
/ keys to access the substores
keys map[string]*storetypes.KVStoreKey
tkeys map[string]*storetypes.TransientStoreKey
memKeys map[string]*storetypes.MemoryStoreKey
/ keepers
AccountKeeper authkeeper.AccountKeeper
BankKeeper bankkeeper.Keeper
CapabilityKeeper *capabilitykeeper.Keeper
StakingKeeper *stakingkeeper.Keeper
SlashingKeeper slashingkeeper.Keeper
MintKeeper mintkeeper.Keeper
DistrKeeper distrkeeper.Keeper
GovKeeper govkeeper.Keeper
CrisisKeeper *crisiskeeper.Keeper
UpgradeKeeper *upgradekeeper.Keeper
ParamsKeeper paramskeeper.Keeper
AuthzKeeper authzkeeper.Keeper
EvidenceKeeper evidencekeeper.Keeper
FeeGrantKeeper feegrantkeeper.Keeper
GroupKeeper groupkeeper.Keeper
NFTKeeper nftkeeper.Keeper
ConsensusParamsKeeper consensusparamkeeper.Keeper
/ the module manager
ModuleManager *module.Manager
/ simulation manager
sm *module.SimulationManager
/ module configurator
configurator module.Configurator
}
func init() {
userHomeDir, err := os.UserHomeDir()
if err != nil {
panic(err)
}
DefaultNodeHome = filepath.Join(userHomeDir, ".simapp")
}
/ NewSimApp returns a reference to an initialized SimApp.
func NewSimApp(
logger log.Logger,
db dbm.DB,
traceStore io.Writer,
loadLatest bool,
appOpts servertypes.AppOptions,
baseAppOptions ...func(*baseapp.BaseApp),
) *SimApp {
encodingConfig := makeEncodingConfig()
appCodec := encodingConfig.Codec
legacyAmino := encodingConfig.Amino
interfaceRegistry := encodingConfig.InterfaceRegistry
txConfig := encodingConfig.TxConfig
/ Below we could construct and set an application specific mempool and ABCI 1.0 Prepare and Process Proposal
/ handlers. These defaults are already set in the SDK's BaseApp, this shows an example of how to override
/ them.
/
/ nonceMempool := mempool.NewSenderNonceMempool()
/ mempoolOpt := baseapp.SetMempool(nonceMempool)
/ prepareOpt := func(app *baseapp.BaseApp) {
/ app.SetPrepareProposal(app.DefaultPrepareProposal())
/
}
/ processOpt := func(app *baseapp.BaseApp) {
/ app.SetProcessProposal(app.DefaultProcessProposal())
/
}
/
/ Further down we'd set the options in the AppBuilder like below.
/ baseAppOptions = append(baseAppOptions, mempoolOpt, prepareOpt, processOpt)
bApp := baseapp.NewBaseApp(appName, logger, db, txConfig.TxDecoder(), baseAppOptions...)
bApp.SetCommitMultiStoreTracer(traceStore)
bApp.SetVersion(version.Version)
bApp.SetInterfaceRegistry(interfaceRegistry)
bApp.SetTxEncoder(txConfig.TxEncoder())
keys := sdk.NewKVStoreKeys(
authtypes.StoreKey, banktypes.StoreKey, stakingtypes.StoreKey, crisistypes.StoreKey,
minttypes.StoreKey, distrtypes.StoreKey, slashingtypes.StoreKey,
govtypes.StoreKey, paramstypes.StoreKey, consensusparamtypes.StoreKey, upgradetypes.StoreKey, feegrant.StoreKey,
evidencetypes.StoreKey, capabilitytypes.StoreKey,
authzkeeper.StoreKey, nftkeeper.StoreKey, group.StoreKey,
)
tkeys := sdk.NewTransientStoreKeys(paramstypes.TStoreKey)
/ NOTE: The testingkey is just mounted for testing purposes. Actual applications should
/ not include this key.
memKeys := sdk.NewMemoryStoreKeys(capabilitytypes.MemStoreKey, "testingkey")
/ load state streaming if enabled
if _, _, err := streaming.LoadStreamingServices(bApp, appOpts, appCodec, logger, keys); err != nil {
logger.Error("failed to load state streaming", "err", err)
os.Exit(1)
}
app := &SimApp{
BaseApp: bApp,
legacyAmino: legacyAmino,
appCodec: appCodec,
txConfig: txConfig,
interfaceRegistry: interfaceRegistry,
keys: keys,
tkeys: tkeys,
memKeys: memKeys,
}
app.ParamsKeeper = initParamsKeeper(appCodec, legacyAmino, keys[paramstypes.StoreKey], tkeys[paramstypes.TStoreKey])
/ set the BaseApp's parameter store
app.ConsensusParamsKeeper = consensusparamkeeper.NewKeeper(appCodec, keys[upgradetypes.StoreKey], authtypes.NewModuleAddress(govtypes.ModuleName).String())
bApp.SetParamStore(&app.ConsensusParamsKeeper)
app.CapabilityKeeper = capabilitykeeper.NewKeeper(appCodec, keys[capabilitytypes.StoreKey], memKeys[capabilitytypes.MemStoreKey])
/ Applications that wish to enforce statically created ScopedKeepers should call `Seal` after creating
/ their scoped modules in `NewApp` with `ScopeToModule`
app.CapabilityKeeper.Seal()
/ add keepers
app.AccountKeeper = authkeeper.NewAccountKeeper(appCodec, keys[authtypes.StoreKey], authtypes.ProtoBaseAccount, maccPerms, sdk.Bech32MainPrefix, authtypes.NewModuleAddress(govtypes.ModuleName).String())
app.BankKeeper = bankkeeper.NewBaseKeeper(
appCodec,
keys[banktypes.StoreKey],
app.AccountKeeper,
BlockedAddresses(),
authtypes.NewModuleAddress(govtypes.ModuleName).String(),
)
app.StakingKeeper = stakingkeeper.NewKeeper(
appCodec, keys[stakingtypes.StoreKey], app.AccountKeeper, app.BankKeeper, authtypes.NewModuleAddress(govtypes.ModuleName).String(),
)
app.MintKeeper = mintkeeper.NewKeeper(appCodec, keys[minttypes.StoreKey], app.StakingKeeper, app.AccountKeeper, app.BankKeeper, authtypes.FeeCollectorName, authtypes.NewModuleAddress(govtypes.ModuleName).String())
app.DistrKeeper = distrkeeper.NewKeeper(appCodec, keys[distrtypes.StoreKey], app.AccountKeeper, app.BankKeeper, app.StakingKeeper, authtypes.FeeCollectorName, authtypes.NewModuleAddress(govtypes.ModuleName).String())
app.SlashingKeeper = slashingkeeper.NewKeeper(
appCodec, legacyAmino, keys[slashingtypes.StoreKey], app.StakingKeeper, authtypes.NewModuleAddress(govtypes.ModuleName).String(),
)
invCheckPeriod := cast.ToUint(appOpts.Get(server.FlagInvCheckPeriod))
app.CrisisKeeper = crisiskeeper.NewKeeper(appCodec, keys[crisistypes.StoreKey], invCheckPeriod,
app.BankKeeper, authtypes.FeeCollectorName, authtypes.NewModuleAddress(govtypes.ModuleName).String())
app.FeeGrantKeeper = feegrantkeeper.NewKeeper(appCodec, keys[feegrant.StoreKey], app.AccountKeeper)
/ register the staking hooks
/ NOTE: stakingKeeper above is passed by reference, so that it will contain these hooks
app.StakingKeeper.SetHooks(
stakingtypes.NewMultiStakingHooks(app.DistrKeeper.Hooks(), app.SlashingKeeper.Hooks()),
)
app.AuthzKeeper = authzkeeper.NewKeeper(keys[authzkeeper.StoreKey], appCodec, app.MsgServiceRouter(), app.AccountKeeper)
groupConfig := group.DefaultConfig()
/*
Example of setting group params:
groupConfig.MaxMetadataLen = 1000
*/
app.GroupKeeper = groupkeeper.NewKeeper(keys[group.StoreKey], appCodec, app.MsgServiceRouter(), app.AccountKeeper, groupConfig)
/ get skipUpgradeHeights from the app options
skipUpgradeHeights := map[int64]bool{
}
for _, h := range cast.ToIntSlice(appOpts.Get(server.FlagUnsafeSkipUpgrades)) {
skipUpgradeHeights[int64(h)] = true
}
homePath := cast.ToString(appOpts.Get(flags.FlagHome))
/ set the governance module account as the authority for conducting upgrades
app.UpgradeKeeper = upgradekeeper.NewKeeper(skipUpgradeHeights, keys[upgradetypes.StoreKey], appCodec, homePath, app.BaseApp, authtypes.NewModuleAddress(govtypes.ModuleName).String())
/ Register the proposal types
/ Deprecated: Avoid adding new handlers, instead use the new proposal flow
/ by granting the governance module the right to execute the message.
/ See: https://github.com/cosmos/cosmos-sdk/blob/release/v0.46.x/x/gov/spec/01_concepts.md#proposal-messages
govRouter := govv1beta1.NewRouter()
govRouter.AddRoute(govtypes.RouterKey, govv1beta1.ProposalHandler).
AddRoute(paramproposal.RouterKey, params.NewParamChangeProposalHandler(app.ParamsKeeper)).
AddRoute(upgradetypes.RouterKey, upgrade.NewSoftwareUpgradeProposalHandler(app.UpgradeKeeper))
govConfig := govtypes.DefaultConfig()
/*
Example of setting gov params:
govConfig.MaxMetadataLen = 10000
*/
govKeeper := govkeeper.NewKeeper(
appCodec, keys[govtypes.StoreKey], app.AccountKeeper, app.BankKeeper,
app.StakingKeeper, app.MsgServiceRouter(), govConfig, authtypes.NewModuleAddress(govtypes.ModuleName).String(),
)
/ Set legacy router for backwards compatibility with gov v1beta1
govKeeper.SetLegacyRouter(govRouter)
app.GovKeeper = *govKeeper.SetHooks(
govtypes.NewMultiGovHooks(
/ register the governance hooks
),
)
app.NFTKeeper = nftkeeper.NewKeeper(keys[nftkeeper.StoreKey], appCodec, app.AccountKeeper, app.BankKeeper)
/ create evidence keeper with router
evidenceKeeper := evidencekeeper.NewKeeper(
appCodec, keys[evidencetypes.StoreKey], app.StakingKeeper, app.SlashingKeeper,
)
/ If evidence needs to be handled for the app, set routes in router here and seal
app.EvidenceKeeper = *evidenceKeeper
/**** Module Options ****/
/ NOTE: we may consider parsing `appOpts` inside module constructors. For the moment
/ we prefer to be more strict in what arguments the modules expect.
skipGenesisInvariants := cast.ToBool(appOpts.Get(crisis.FlagSkipGenesisInvariants))
/ NOTE: Any module instantiated in the module manager that is later modified
/ must be passed by reference here.
app.ModuleManager = module.NewManager(
genutil.NewAppModule(
app.AccountKeeper, app.StakingKeeper, app.BaseApp.DeliverTx,
encodingConfig.TxConfig,
),
auth.NewAppModule(appCodec, app.AccountKeeper, authsims.RandomGenesisAccounts, app.GetSubspace(authtypes.ModuleName)),
vesting.NewAppModule(app.AccountKeeper, app.BankKeeper),
bank.NewAppModule(appCodec, app.BankKeeper, app.AccountKeeper, app.GetSubspace(banktypes.ModuleName)),
capability.NewAppModule(appCodec, *app.CapabilityKeeper, false),
crisis.NewAppModule(app.CrisisKeeper, skipGenesisInvariants, app.GetSubspace(crisistypes.ModuleName)),
feegrantmodule.NewAppModule(appCodec, app.AccountKeeper, app.BankKeeper, app.FeeGrantKeeper, app.interfaceRegistry),
gov.NewAppModule(appCodec, &app.GovKeeper, app.AccountKeeper, app.BankKeeper, app.GetSubspace(govtypes.ModuleName)),
mint.NewAppModule(appCodec, app.MintKeeper, app.AccountKeeper, nil, app.GetSubspace(minttypes.ModuleName)),
slashing.NewAppModule(appCodec, app.SlashingKeeper, app.AccountKeeper, app.BankKeeper, app.StakingKeeper, app.GetSubspace(slashingtypes.ModuleName)),
distr.NewAppModule(appCodec, app.DistrKeeper, app.AccountKeeper, app.BankKeeper, app.StakingKeeper, app.GetSubspace(distrtypes.ModuleName)),
staking.NewAppModule(appCodec, app.StakingKeeper, app.AccountKeeper, app.BankKeeper, app.GetSubspace(stakingtypes.ModuleName)),
upgrade.NewAppModule(app.UpgradeKeeper),
evidence.NewAppModule(app.EvidenceKeeper),
params.NewAppModule(app.ParamsKeeper),
authzmodule.NewAppModule(appCodec, app.AuthzKeeper, app.AccountKeeper, app.BankKeeper, app.interfaceRegistry),
groupmodule.NewAppModule(appCodec, app.GroupKeeper, app.AccountKeeper, app.BankKeeper, app.interfaceRegistry),
nftmodule.NewAppModule(appCodec, app.NFTKeeper, app.AccountKeeper, app.BankKeeper, app.interfaceRegistry),
consensus.NewAppModule(appCodec, app.ConsensusParamsKeeper),
)
/ During begin block slashing happens after distr.BeginBlocker so that
/ there is nothing left over in the validator fee pool, so as to keep the
/ CanWithdrawInvariant invariant.
/ NOTE: staking module is required if HistoricalEntries param > 0
/ NOTE: capability module's beginblocker must come before any modules using capabilities (e.g. IBC)
app.ModuleManager.SetOrderBeginBlockers(
upgradetypes.ModuleName, capabilitytypes.ModuleName, minttypes.ModuleName, distrtypes.ModuleName, slashingtypes.ModuleName,
evidencetypes.ModuleName, stakingtypes.ModuleName,
authtypes.ModuleName, banktypes.ModuleName, govtypes.ModuleName, crisistypes.ModuleName, genutiltypes.ModuleName,
authz.ModuleName, feegrant.ModuleName, nft.ModuleName, group.ModuleName,
paramstypes.ModuleName, vestingtypes.ModuleName, consensusparamtypes.ModuleName,
)
app.ModuleManager.SetOrderEndBlockers(
crisistypes.ModuleName, govtypes.ModuleName, stakingtypes.ModuleName,
capabilitytypes.ModuleName, authtypes.ModuleName, banktypes.ModuleName, distrtypes.ModuleName,
slashingtypes.ModuleName, minttypes.ModuleName,
genutiltypes.ModuleName, evidencetypes.ModuleName, authz.ModuleName,
feegrant.ModuleName, nft.ModuleName, group.ModuleName,
paramstypes.ModuleName, upgradetypes.ModuleName, vestingtypes.ModuleName, consensusparamtypes.ModuleName,
)
/ NOTE: The genutils module must occur after staking so that pools are
/ properly initialized with tokens from genesis accounts.
/ NOTE: The genutils module must also occur after auth so that it can access the params from auth.
/ NOTE: Capability module must occur first so that it can initialize any capabilities
/ so that other modules that want to create or claim capabilities afterwards in InitChain
/ can do so safely.
genesisModuleOrder := []string{
capabilitytypes.ModuleName, authtypes.ModuleName, banktypes.ModuleName,
distrtypes.ModuleName, stakingtypes.ModuleName, slashingtypes.ModuleName, govtypes.ModuleName,
minttypes.ModuleName, crisistypes.ModuleName, genutiltypes.ModuleName, evidencetypes.ModuleName, authz.ModuleName,
feegrant.ModuleName, nft.ModuleName, group.ModuleName, paramstypes.ModuleName, upgradetypes.ModuleName,
vestingtypes.ModuleName, consensusparamtypes.ModuleName,
}
app.ModuleManager.SetOrderInitGenesis(genesisModuleOrder...)
app.ModuleManager.SetOrderExportGenesis(genesisModuleOrder...)
/ Uncomment if you want to set a custom migration order here.
/ app.ModuleManager.SetOrderMigrations(custom order)
app.ModuleManager.RegisterInvariants(app.CrisisKeeper)
app.configurator = module.NewConfigurator(app.appCodec, app.MsgServiceRouter(), app.GRPCQueryRouter())
app.ModuleManager.RegisterServices(app.configurator)
/ RegisterUpgradeHandlers is used for registering any on-chain upgrades.
/ Make sure it's called after `app.ModuleManager` and `app.configurator` are set.
app.RegisterUpgradeHandlers()
autocliv1.RegisterQueryServer(app.GRPCQueryRouter(), runtimeservices.NewAutoCLIQueryService(app.ModuleManager.Modules))
reflectionSvc, err := runtimeservices.NewReflectionService()
if err != nil {
panic(err)
}
reflectionv1.RegisterReflectionServiceServer(app.GRPCQueryRouter(), reflectionSvc)
/ add test gRPC service for testing gRPC queries in isolation
testdata_pulsar.RegisterQueryServer(app.GRPCQueryRouter(), testdata_pulsar.QueryImpl{
})
/ create the simulation manager and define the order of the modules for deterministic simulations
/
/ NOTE: this is not required apps that don't use the simulator for fuzz testing
/ transactions
overrideModules := map[string]module.AppModuleSimulation{
authtypes.ModuleName: auth.NewAppModule(app.appCodec, app.AccountKeeper, authsims.RandomGenesisAccounts, app.GetSubspace(authtypes.ModuleName)),
}
app.sm = module.NewSimulationManagerFromAppModules(app.ModuleManager.Modules, overrideModules)
app.sm.RegisterStoreDecoders()
/ initialize stores
app.MountKVStores(keys)
app.MountTransientStores(tkeys)
app.MountMemoryStores(memKeys)
/ initialize BaseApp
app.SetInitChainer(app.InitChainer)
app.SetBeginBlocker(app.BeginBlocker)
app.SetEndBlocker(app.EndBlocker)
app.setAnteHandler(encodingConfig.TxConfig)
/ In v0.46, the SDK introduces _postHandlers_. PostHandlers are like
/ antehandlers, but are run _after_ the `runMsgs` execution. They are also
/ defined as a chain, and have the same signature as antehandlers.
/
/ In baseapp, postHandlers are run in the same store branch as `runMsgs`,
/ meaning that both `runMsgs` and `postHandler` state will be committed if
/ both are successful, and both will be reverted if any of the two fails.
/
/ The SDK exposes a default postHandlers chain, which comprises of only
/ one decorator: the Transaction Tips decorator. However, some chains do
/ not need it by default, so feel free to comment the next line if you do
/ not need tips.
/ To read more about tips:
/ https://docs.cosmos.network/main/core/tips.html
/
/ Please note that changing any of the anteHandler or postHandler chain is
/ likely to be a state-machine breaking change, which needs a coordinated
/ upgrade.
app.setPostHandler()
if loadLatest {
if err := app.LoadLatestVersion(); err != nil {
logger.Error("error on loading last version", "err", err)
os.Exit(1)
}
}
return app
}
func (app *SimApp)
setAnteHandler(txConfig client.TxConfig) {
anteHandler, err := ante.NewAnteHandler(
ante.HandlerOptions{
AccountKeeper: app.AccountKeeper,
BankKeeper: app.BankKeeper,
SignModeHandler: txConfig.SignModeHandler(),
FeegrantKeeper: app.FeeGrantKeeper,
SigGasConsumer: ante.DefaultSigVerificationGasConsumer,
},
)
if err != nil {
panic(err)
}
app.SetAnteHandler(anteHandler)
}
func (app *SimApp)
setPostHandler() {
postHandler, err := posthandler.NewPostHandler(
posthandler.HandlerOptions{
},
)
if err != nil {
panic(err)
}
app.SetPostHandler(postHandler)
}
/ Name returns the name of the App
func (app *SimApp)
Name()
string {
return app.BaseApp.Name()
}
/ BeginBlocker application updates every begin block
func (app *SimApp)
BeginBlocker(ctx sdk.Context, req abci.RequestBeginBlock)
abci.ResponseBeginBlock {
return app.ModuleManager.BeginBlock(ctx, req)
}
/ EndBlocker application updates every end block
func (app *SimApp)
EndBlocker(ctx sdk.Context, req abci.RequestEndBlock)
abci.ResponseEndBlock {
return app.ModuleManager.EndBlock(ctx, req)
}
func (a *SimApp)
Configurator()
module.Configurator {
return a.configurator
}
/ InitChainer application update at chain initialization
func (app *SimApp)
InitChainer(ctx sdk.Context, req abci.RequestInitChain)
abci.ResponseInitChain {
var genesisState GenesisState
if err := json.Unmarshal(req.AppStateBytes, &genesisState); err != nil {
panic(err)
}
app.UpgradeKeeper.SetModuleVersionMap(ctx, app.ModuleManager.GetVersionMap())
return app.ModuleManager.InitGenesis(ctx, app.appCodec, genesisState)
}
/ LoadHeight loads a particular height
func (app *SimApp)
LoadHeight(height int64)
error {
return app.LoadVersion(height)
}
/ LegacyAmino returns SimApp's amino codec.
/
/ NOTE: This is solely to be used for testing purposes as it may be desirable
/ for modules to register their own custom testing types.
func (app *SimApp)
LegacyAmino() *codec.LegacyAmino {
return app.legacyAmino
}
/ AppCodec returns SimApp's app codec.
/
/ NOTE: This is solely to be used for testing purposes as it may be desirable
/ for modules to register their own custom testing types.
func (app *SimApp)
AppCodec()
codec.Codec {
return app.appCodec
}
/ InterfaceRegistry returns SimApp's InterfaceRegistry
func (app *SimApp)
InterfaceRegistry()
types.InterfaceRegistry {
return app.interfaceRegistry
}
/ TxConfig returns SimApp's TxConfig
func (app *SimApp)
TxConfig()
client.TxConfig {
return app.txConfig
}
/ DefaultGenesis returns a default genesis from the registered AppModuleBasic's.
func (a *SimApp)
DefaultGenesis()
map[string]json.RawMessage {
return ModuleBasics.DefaultGenesis(a.appCodec)
}
/ GetKey returns the KVStoreKey for the provided store key.
/
/ NOTE: This is solely to be used for testing purposes.
func (app *SimApp)
GetKey(storeKey string) *storetypes.KVStoreKey {
return app.keys[storeKey]
}
/ GetTKey returns the TransientStoreKey for the provided store key.
/
/ NOTE: This is solely to be used for testing purposes.
func (app *SimApp)
GetTKey(storeKey string) *storetypes.TransientStoreKey {
return app.tkeys[storeKey]
}
/ GetMemKey returns the MemStoreKey for the provided mem key.
/
/ NOTE: This is solely used for testing purposes.
func (app *SimApp)
GetMemKey(storeKey string) *storetypes.MemoryStoreKey {
return app.memKeys[storeKey]
}
/ GetSubspace returns a param subspace for a given module name.
/
/ NOTE: This is solely to be used for testing purposes.
func (app *SimApp)
GetSubspace(moduleName string)
paramstypes.Subspace {
subspace, _ := app.ParamsKeeper.GetSubspace(moduleName)
return subspace
}
/ SimulationManager implements the SimulationApp interface
func (app *SimApp)
SimulationManager() *module.SimulationManager {
return app.sm
}
/ RegisterAPIRoutes registers all application module routes with the provided
/ API server.
func (app *SimApp)
RegisterAPIRoutes(apiSvr *api.Server, apiConfig config.APIConfig) {
clientCtx := apiSvr.ClientCtx
/ Register new tx routes from grpc-gateway.
authtx.RegisterGRPCGatewayRoutes(clientCtx, apiSvr.GRPCGatewayRouter)
/ Register new tendermint queries routes from grpc-gateway.
tmservice.RegisterGRPCGatewayRoutes(clientCtx, apiSvr.GRPCGatewayRouter)
/ Register node gRPC service for grpc-gateway.
nodeservice.RegisterGRPCGatewayRoutes(clientCtx, apiSvr.GRPCGatewayRouter)
/ Register grpc-gateway routes for all modules.
ModuleBasics.RegisterGRPCGatewayRoutes(clientCtx, apiSvr.GRPCGatewayRouter)
/ register swagger API from root so that other applications can override easily
if err := server.RegisterSwaggerAPI(apiSvr.ClientCtx, apiSvr.Router, apiConfig.Swagger); err != nil {
panic(err)
}
}
/ RegisterTxService implements the Application.RegisterTxService method.
func (app *SimApp)
RegisterTxService(clientCtx client.Context) {
authtx.RegisterTxService(app.BaseApp.GRPCQueryRouter(), clientCtx, app.BaseApp.Simulate, app.interfaceRegistry)
}
/ RegisterTendermintService implements the Application.RegisterTendermintService method.
func (app *SimApp)
RegisterTendermintService(clientCtx client.Context) {
tmservice.RegisterTendermintService(
clientCtx,
app.BaseApp.GRPCQueryRouter(),
app.interfaceRegistry,
app.Query,
)
}
func (app *SimApp)
RegisterNodeService(clientCtx client.Context) {
nodeservice.RegisterNodeService(clientCtx, app.GRPCQueryRouter())
}
/ GetMaccPerms returns a copy of the module account permissions
/
/ NOTE: This is solely to be used for testing purposes.
func GetMaccPerms()
map[string][]string {
dupMaccPerms := make(map[string][]string)
for k, v := range maccPerms {
dupMaccPerms[k] = v
}
return dupMaccPerms
}
/ BlockedAddresses returns all the app's blocked account addresses.
func BlockedAddresses()
map[string]bool {
modAccAddrs := make(map[string]bool)
for acc := range GetMaccPerms() {
modAccAddrs[authtypes.NewModuleAddress(acc).String()] = true
}
/ allow the following addresses to receive funds
delete(modAccAddrs, authtypes.NewModuleAddress(govtypes.ModuleName).String())
return modAccAddrs
}
/ initParamsKeeper init params keeper and its subspaces
func initParamsKeeper(appCodec codec.BinaryCodec, legacyAmino *codec.LegacyAmino, key, tkey storetypes.StoreKey)
paramskeeper.Keeper {
paramsKeeper := paramskeeper.NewKeeper(appCodec, legacyAmino, key, tkey)
paramsKeeper.Subspace(authtypes.ModuleName)
paramsKeeper.Subspace(banktypes.ModuleName)
paramsKeeper.Subspace(stakingtypes.ModuleName)
paramsKeeper.Subspace(minttypes.ModuleName)
paramsKeeper.Subspace(distrtypes.ModuleName)
paramsKeeper.Subspace(slashingtypes.ModuleName)
paramsKeeper.Subspace(govtypes.ModuleName).WithKeyTable(govv1.ParamKeyTable())
paramsKeeper.Subspace(crisistypes.ModuleName)
return paramsKeeper
}
func makeEncodingConfig()
simappparams.EncodingConfig {
encodingConfig := simappparams.MakeTestEncodingConfig()
std.RegisterLegacyAminoCodec(encodingConfig.Amino)
std.RegisterInterfaces(encodingConfig.InterfaceRegistry)
ModuleBasics.RegisterLegacyAminoCodec(encodingConfig.Amino)
ModuleBasics.RegisterInterfaces(encodingConfig.InterfaceRegistry)
return encodingConfig
}
baseapp is to provide a secure interface between the store and the extensible state machine while defining as little about the state machine as possible (staying true to the ABCI).
For more on baseapp, please click here.
Multistore
The Cosmos SDK provides amultistore for persisting state. The multistore allows developers to declare any number of KVStores. These KVStores only accept the []byte type as value and therefore any custom structure needs to be marshalled using a codec before being stored.
The multistore abstraction is used to divide the state in distinct compartments, each managed by its own module. For more on the multistore, click here
Modules
The power of the Cosmos SDK lies in its modularity. Cosmos SDK applications are built by aggregating a collection of interoperable modules. Each module defines a subset of the state and contains its own message/transaction processor, while the Cosmos SDK is responsible for routing each message to its respective module. Here is a simplified view of how a transaction is processed by the application of each full-node when it is received in a valid block:Copy
Ask AI
+
|
| Transaction relayed from the full-node's
| CometBFT engine to the node's application
| via DeliverTx
|
|
+---------------------v--------------------------+
| APPLICATION |
| |
| Using baseapp's methods: Decode the Tx, |
| extract and route the message(s) |
| |
+---------------------+--------------------------+
|
|
|
+---------------------------+
|
|
| Message routed to
| the correct module
| to be processed
|
|
+----------------+ +---------------+ +----------------+ +------v----------+
| | | | | | | |
| AUTH MODULE | | BANK MODULE | | STAKING MODULE | | GOV MODULE |
| | | | | | | |
| | | | | | | Handles message,|
| | | | | | | Updates state |
| | | | | | | |
+----------------+ +---------------+ +----------------+ +------+----------+
|
|
|
|
+--------------------------+
|
| Return result to CometBFT
| (0=Ok, 1=Err)
v
messages are extracted from transactions by baseapp). In general, each module declares its own KVStore in the multistore to persist the subset of the state it defines. Most developers will need to access other 3rd party modules when building their own modules. Given that the Cosmos SDK is an open framework, some of the modules may be malicious, which means there is a need for security principles to reason about inter-module interactions. These principles are based on object-capabilities. In practice, this means that instead of having each module keep an access control list for other modules, each module implements special objects called keepers that can be passed to other modules to grant a pre-defined set of capabilities.
Cosmos SDK modules are defined in the x/ folder of the Cosmos SDK. Some core modules include:
x/auth: Used to manage accounts and signatures.x/bank: Used to enable tokens and token transfers.x/staking+x/slashing: Used to build Proof-Of-Stake blockchains.
x/, that anyone can use in their app, the Cosmos SDK lets you build your own custom modules. You can check an example of that in the tutorial.