tests/e2e/auction/cli_test.go

@@ -3,10 +3,10 @@ package auction
 import (
 	"testing"
 
-	"github.com/cosmos/cosmos-sdk/testutil/network"
 	"github.com/stretchr/testify/suite"
 
 	"git.vdb.to/cerc-io/laconic2d/tests/e2e"
+	"git.vdb.to/cerc-io/laconic2d/testutil/network"
 )
 
 func TestAuctionE2ETestSuite(t *testing.T) {

tests/e2e/auction/suite.go

@@ -13,9 +13,9 @@ import (
 	"github.com/cosmos/cosmos-sdk/crypto/hd"
 	"github.com/cosmos/cosmos-sdk/crypto/keyring"
 	clitestutil "github.com/cosmos/cosmos-sdk/testutil/cli"
-	"github.com/cosmos/cosmos-sdk/testutil/network"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 
+	"git.vdb.to/cerc-io/laconic2d/testutil/network"
 	types "git.vdb.to/cerc-io/laconic2d/x/auction"
 	"git.vdb.to/cerc-io/laconic2d/x/auction/client/cli"
 )

tests/e2e/bond/cli_test.go

@@ -3,10 +3,10 @@ package bond
 import (
 	"testing"
 
-	"github.com/cosmos/cosmos-sdk/testutil/network"
 	"github.com/stretchr/testify/suite"
 
 	"git.vdb.to/cerc-io/laconic2d/tests/e2e"
+	"git.vdb.to/cerc-io/laconic2d/testutil/network"
 )
 
 func TestBondE2ETestSuite(t *testing.T) {

tests/e2e/bond/suite.go

@@ -11,9 +11,9 @@ import (
 	"github.com/cosmos/cosmos-sdk/crypto/hd"
 	"github.com/cosmos/cosmos-sdk/crypto/keyring"
 	clitestutil "github.com/cosmos/cosmos-sdk/testutil/cli"
-	"github.com/cosmos/cosmos-sdk/testutil/network"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 
+	"git.vdb.to/cerc-io/laconic2d/testutil/network"
 	bondtypes "git.vdb.to/cerc-io/laconic2d/x/bond"
 	"git.vdb.to/cerc-io/laconic2d/x/bond/client/cli"
 )

tests/e2e/common.go

@@ -11,7 +11,6 @@ import (
 	bam "github.com/cosmos/cosmos-sdk/baseapp"
 	"github.com/cosmos/cosmos-sdk/client/flags"
 	servertypes "github.com/cosmos/cosmos-sdk/server/types"
-	"github.com/cosmos/cosmos-sdk/testutil/network"
 	simtestutil "github.com/cosmos/cosmos-sdk/testutil/sims"
 	"github.com/cosmos/cosmos-sdk/types/module/testutil"
 	"github.com/cosmos/cosmos-sdk/x/auth"
@@ -23,6 +22,7 @@ import (
 	registrymodule "git.vdb.to/cerc-io/laconic2d/x/registry/module"
 
 	_ "git.vdb.to/cerc-io/laconic2d/app/params" // import for side-effects (see init)
+	"git.vdb.to/cerc-io/laconic2d/testutil/network"
 )
 
 // NewTestNetworkFixture returns a new LaconicApp AppConstructor for network simulation tests

tests/e2e/registry/cli_test.go

@@ -3,10 +3,10 @@ package registry
 import (
 	"testing"
 
-	"github.com/cosmos/cosmos-sdk/testutil/network"
 	"github.com/stretchr/testify/suite"
 
 	"git.vdb.to/cerc-io/laconic2d/tests/e2e"
+	"git.vdb.to/cerc-io/laconic2d/testutil/network"
 )
 
 func TestRegistryE2ETestSuite(t *testing.T) {

tests/e2e/registry/suite.go

@@ -13,9 +13,9 @@ import (
 	"github.com/cosmos/cosmos-sdk/crypto/hd"
 	"github.com/cosmos/cosmos-sdk/crypto/keyring"
 	clitestutil "github.com/cosmos/cosmos-sdk/testutil/cli"
-	"github.com/cosmos/cosmos-sdk/testutil/network"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 
+	"git.vdb.to/cerc-io/laconic2d/testutil/network"
 	bondtypes "git.vdb.to/cerc-io/laconic2d/x/bond"
 	bondcli "git.vdb.to/cerc-io/laconic2d/x/bond/client/cli"
 	registrytypes "git.vdb.to/cerc-io/laconic2d/x/registry"

testutil/network/doc.go

@@ -0,0 +1,66 @@
+/*
+Package network implements and exposes a fully operational in-process CometBFT
+test network that consists of at least one or potentially many validators. This
+test network can be used primarily for integration tests or unit test suites.
+
+The test network utilizes SimApp as the ABCI application and uses all the modules
+defined in the Cosmos SDK. An in-process test network can be configured with any
+number of validators as well as account funds and even custom genesis state.
+
+When creating a test network, a series of Validator objects are returned. Each
+Validator object has useful information such as their address and public key. A
+Validator will also provide its RPC, P2P, and API addresses that can be useful
+for integration testing. In addition, a CometBFT local RPC client is also provided
+which can be handy for making direct RPC calls to CometBFT.
+
+Note, due to limitations in concurrency and the design of the RPC layer in
+CometBFT, only the first Validator object will have an RPC and API client
+exposed. Due to this exact same limitation, only a single test network can exist
+at a time. A caller must be certain it calls Cleanup after it no longer needs
+the network.
+
+A typical testing flow might look like the following:
+
+	type IntegrationTestSuite struct {
+		suite.Suite
+
+		cfg     network.Config
+		network *network.Network
+	}
+
+	func (s *IntegrationTestSuite) SetupSuite() {
+		s.T().Log("setting up integration test suite")
+
+		cfg := network.DefaultConfig()
+		cfg.NumValidators = 1
+		s.cfg = cfg
+
+		var err error
+		s.network, err = network.New(s.T(), s.T().TempDir(), cfg)
+		s.Require().NoError(err)
+
+		s.Require().NoError(s.network.WaitForNextBlock())
+	}
+
+	func (s *IntegrationTestSuite) TearDownSuite() {
+		s.T().Log("tearing down integration test suite")
+
+		// This is important and must be called to ensure other tests can create
+		// a network!
+		s.network.Cleanup()
+	}
+
+	func (s *IntegrationTestSuite) TestQueryBalancesRequestHandlerFn() {
+		val := s.network.Validators[0]
+		baseURL := val.APIAddress
+
+		// Use baseURL to make API HTTP requests or use val.RPCClient to make direct
+		// CometBFT RPC calls.
+		// ...
+	}
+
+	func TestIntegrationTestSuite(t *testing.T) {
+		suite.Run(t, new(IntegrationTestSuite))
+	}
+*/
+package network

testutil/network/network.go

@@ -0,0 +1,864 @@
+package network
+
+import (
+	"bufio"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"net/url"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"strings"
+	"sync"
+	"syscall"
+	"testing"
+	"time"
+
+	"github.com/cometbft/cometbft/node"
+	cmtclient "github.com/cometbft/cometbft/rpc/client"
+	dbm "github.com/cosmos/cosmos-db"
+	"github.com/spf13/cobra"
+	"golang.org/x/sync/errgroup"
+	"google.golang.org/grpc"
+
+	"cosmossdk.io/depinject"
+	"cosmossdk.io/log"
+	sdkmath "cosmossdk.io/math"
+	"cosmossdk.io/math/unsafe"
+	pruningtypes "cosmossdk.io/store/pruning/types"
+
+	"github.com/cosmos/cosmos-sdk/baseapp"
+	"github.com/cosmos/cosmos-sdk/client"
+	"github.com/cosmos/cosmos-sdk/client/flags"
+	"github.com/cosmos/cosmos-sdk/client/grpc/cmtservice"
+	"github.com/cosmos/cosmos-sdk/client/tx"
+	"github.com/cosmos/cosmos-sdk/codec"
+	codectypes "github.com/cosmos/cosmos-sdk/codec/types"
+	"github.com/cosmos/cosmos-sdk/crypto/hd"
+	"github.com/cosmos/cosmos-sdk/crypto/keyring"
+	cryptotypes "github.com/cosmos/cosmos-sdk/crypto/types"
+	"github.com/cosmos/cosmos-sdk/runtime"
+	"github.com/cosmos/cosmos-sdk/server"
+	"github.com/cosmos/cosmos-sdk/server/api"
+	srvconfig "github.com/cosmos/cosmos-sdk/server/config"
+	servertypes "github.com/cosmos/cosmos-sdk/server/types"
+	"github.com/cosmos/cosmos-sdk/testutil"
+	"github.com/cosmos/cosmos-sdk/testutil/configurator"
+	"github.com/cosmos/cosmos-sdk/testutil/testdata"
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	moduletestutil "github.com/cosmos/cosmos-sdk/types/module/testutil"
+	_ "github.com/cosmos/cosmos-sdk/x/auth"           // import auth as a blank
+	_ "github.com/cosmos/cosmos-sdk/x/auth/tx/config" // import auth tx config as a blank
+	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
+	_ "github.com/cosmos/cosmos-sdk/x/bank" // import bank as a blank
+	banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
+	_ "github.com/cosmos/cosmos-sdk/x/consensus" // import consensus as a blank
+	"github.com/cosmos/cosmos-sdk/x/genutil"
+	_ "github.com/cosmos/cosmos-sdk/x/params"  // import params as a blank
+	_ "github.com/cosmos/cosmos-sdk/x/staking" // import staking as a blank
+	stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types"
+)
+
+// package-wide network lock to only allow one test network at a time
+var (
+	lock     = new(sync.Mutex)
+	portPool = make(chan string, 200)
+)
+
+func init() {
+	closeFns := []func() error{}
+	for i := 0; i < 200; i++ {
+		_, port, closeFn, err := FreeTCPAddr()
+		if err != nil {
+			panic(err)
+		}
+
+		portPool <- port
+		closeFns = append(closeFns, closeFn)
+	}
+
+	for _, closeFn := range closeFns {
+		err := closeFn()
+		if err != nil {
+			panic(err)
+		}
+	}
+}
+
+// AppConstructor defines a function which accepts a network configuration and
+// creates an ABCI Application to provide to CometBFT.
+type (
+	AppConstructor     = func(val ValidatorI) servertypes.Application
+	TestFixtureFactory = func() TestFixture
+)
+
+type TestFixture struct {
+	AppConstructor AppConstructor
+	GenesisState   map[string]json.RawMessage
+	EncodingConfig moduletestutil.TestEncodingConfig
+}
+
+// Config defines the necessary configuration used to bootstrap and start an
+// in-process local testing network.
+type Config struct {
+	Codec             codec.Codec
+	LegacyAmino       *codec.LegacyAmino // TODO: Remove!
+	InterfaceRegistry codectypes.InterfaceRegistry
+
+	TxConfig         client.TxConfig
+	AccountRetriever client.AccountRetriever
+	AppConstructor   AppConstructor             // the ABCI application constructor
+	GenesisState     map[string]json.RawMessage // custom genesis state to provide
+	TimeoutCommit    time.Duration              // the consensus commitment timeout
+	ChainID          string                     // the network chain-id
+	NumValidators    int                        // the total number of validators to create and bond
+	Mnemonics        []string                   // custom user-provided validator operator mnemonics
+	BondDenom        string                     // the staking bond denomination
+	MinGasPrices     string                     // the minimum gas prices each validator will accept
+	AccountTokens    sdkmath.Int                // the amount of unique validator tokens (e.g. 1000node0)
+	StakingTokens    sdkmath.Int                // the amount of tokens each validator has available to stake
+	BondedTokens     sdkmath.Int                // the amount of tokens each validator stakes
+	PruningStrategy  string                     // the pruning strategy each validator will have
+	EnableLogging    bool                       // enable logging to STDOUT
+	CleanupDir       bool                       // remove base temporary directory during cleanup
+	SigningAlgo      string                     // signing algorithm for keys
+	KeyringOptions   []keyring.Option           // keyring configuration options
+	RPCAddress       string                     // RPC listen address (including port)
+	APIAddress       string                     // REST API listen address (including port)
+	GRPCAddress      string                     // GRPC server listen address (including port)
+	PrintMnemonic    bool                       // print the mnemonic of first validator as log output for testing
+}
+
+// DefaultConfig returns a sane default configuration suitable for nearly all
+// testing requirements.
+func DefaultConfig(factory TestFixtureFactory) Config {
+	fixture := factory()
+
+	return Config{
+		Codec:             fixture.EncodingConfig.Codec,
+		TxConfig:          fixture.EncodingConfig.TxConfig,
+		LegacyAmino:       fixture.EncodingConfig.Amino,
+		InterfaceRegistry: fixture.EncodingConfig.InterfaceRegistry,
+		AccountRetriever:  authtypes.AccountRetriever{},
+		AppConstructor:    fixture.AppConstructor,
+		GenesisState:      fixture.GenesisState,
+		TimeoutCommit:     2 * time.Second,
+		ChainID:           "chain-" + unsafe.Str(6),
+		NumValidators:     4,
+		BondDenom:         sdk.DefaultBondDenom,
+		MinGasPrices:      fmt.Sprintf("0.000006%s", sdk.DefaultBondDenom),
+		AccountTokens:     sdk.TokensFromConsensusPower(1000, sdk.DefaultPowerReduction),
+		StakingTokens:     sdk.TokensFromConsensusPower(500, sdk.DefaultPowerReduction),
+		BondedTokens:      sdk.TokensFromConsensusPower(100, sdk.DefaultPowerReduction),
+		PruningStrategy:   pruningtypes.PruningOptionNothing,
+		CleanupDir:        true,
+		SigningAlgo:       string(hd.Secp256k1Type),
+		KeyringOptions:    []keyring.Option{},
+		PrintMnemonic:     false,
+	}
+}
+
+// MinimumAppConfig defines the minimum of modules required for a call to New to succeed
+func MinimumAppConfig() depinject.Config {
+	return configurator.NewAppConfig(
+		configurator.AuthModule(),
+		configurator.ParamsModule(),
+		configurator.BankModule(),
+		configurator.GenutilModule(),
+		configurator.StakingModule(),
+		configurator.ConsensusModule(),
+		configurator.TxModule(),
+	)
+}
+
+func DefaultConfigWithAppConfig(appConfig depinject.Config) (Config, error) {
+	var (
+		appBuilder        *runtime.AppBuilder
+		txConfig          client.TxConfig
+		legacyAmino       *codec.LegacyAmino
+		cdc               codec.Codec
+		interfaceRegistry codectypes.InterfaceRegistry
+	)
+
+	if err := depinject.Inject(
+		depinject.Configs(
+			appConfig,
+			depinject.Supply(log.NewNopLogger()),
+		),
+		&appBuilder,
+		&txConfig,
+		&cdc,
+		&legacyAmino,
+		&interfaceRegistry,
+	); err != nil {
+		return Config{}, err
+	}
+
+	cfg := DefaultConfig(func() TestFixture {
+		return TestFixture{}
+	})
+	cfg.Codec = cdc
+	cfg.TxConfig = txConfig
+	cfg.LegacyAmino = legacyAmino
+	cfg.InterfaceRegistry = interfaceRegistry
+	cfg.GenesisState = appBuilder.DefaultGenesis()
+	cfg.AppConstructor = func(val ValidatorI) servertypes.Application {
+		// we build a unique app instance for every validator here
+		var appBuilder *runtime.AppBuilder
+		if err := depinject.Inject(
+			depinject.Configs(
+				appConfig,
+				depinject.Supply(val.GetCtx().Logger),
+			),
+			&appBuilder); err != nil {
+			panic(err)
+		}
+		app := appBuilder.Build(
+			dbm.NewMemDB(),
+			nil,
+			baseapp.SetPruning(pruningtypes.NewPruningOptionsFromString(val.GetAppConfig().Pruning)),
+			baseapp.SetMinGasPrices(val.GetAppConfig().MinGasPrices),
+			baseapp.SetChainID(cfg.ChainID),
+		)
+
+		testdata.RegisterQueryServer(app.GRPCQueryRouter(), testdata.QueryImpl{})
+
+		if err := app.Load(true); err != nil {
+			panic(err)
+		}
+
+		return app
+	}
+
+	return cfg, nil
+}
+
+type (
+	// Network defines a local in-process testing network using SimApp. It can be
+	// configured to start any number of validators, each with its own RPC and API
+	// clients. Typically, this test network would be used in client and integration
+	// testing where user input is expected.
+	//
+	// Note, due to CometBFT constraints in regards to RPC functionality, there
+	// may only be one test network running at a time. Thus, any caller must be
+	// sure to Cleanup after testing is finished in order to allow other tests
+	// to create networks. In addition, only the first validator will have a valid
+	// RPC and API server/client.
+	Network struct {
+		Logger     Logger
+		BaseDir    string
+		Validators []*Validator
+
+		Config Config
+	}
+
+	// Validator defines an in-process CometBFT validator node. Through this object,
+	// a client can make RPC and API calls and interact with any client command
+	// or handler.
+	Validator struct {
+		AppConfig  *srvconfig.Config
+		ClientCtx  client.Context
+		Ctx        *server.Context
+		Dir        string
+		NodeID     string
+		PubKey     cryptotypes.PubKey
+		Moniker    string
+		APIAddress string
+		RPCAddress string
+		P2PAddress string
+		Address    sdk.AccAddress
+		ValAddress sdk.ValAddress
+		RPCClient  cmtclient.Client
+
+		app      servertypes.Application
+		tmNode   *node.Node
+		api      *api.Server
+		grpc     *grpc.Server
+		grpcWeb  *http.Server
+		errGroup *errgroup.Group
+		cancelFn context.CancelFunc
+	}
+
+	// ValidatorI expose a validator's context and configuration
+	ValidatorI interface {
+		GetCtx() *server.Context
+		GetAppConfig() *srvconfig.Config
+	}
+
+	// Logger is a network logger interface that exposes testnet-level Log() methods for an in-process testing network
+	// This is not to be confused with logging that may happen at an individual node or validator level
+	Logger interface {
+		Log(args ...interface{})
+		Logf(format string, args ...interface{})
+	}
+)
+
+var (
+	_ Logger     = (*testing.T)(nil)
+	_ Logger     = (*CLILogger)(nil)
+	_ ValidatorI = Validator{}
+)
+
+func (v Validator) GetCtx() *server.Context {
+	return v.Ctx
+}
+
+func (v Validator) GetAppConfig() *srvconfig.Config {
+	return v.AppConfig
+}
+
+// CLILogger wraps a cobra.Command and provides command logging methods.
+type CLILogger struct {
+	cmd *cobra.Command
+}
+
+// Log logs given args.
+func (s CLILogger) Log(args ...interface{}) {
+	s.cmd.Println(args...)
+}
+
+// Logf logs given args according to a format specifier.
+func (s CLILogger) Logf(format string, args ...interface{}) {
+	s.cmd.Printf(format, args...)
+}
+
+// NewCLILogger creates a new CLILogger.
+func NewCLILogger(cmd *cobra.Command) CLILogger {
+	return CLILogger{cmd}
+}
+
+// New creates a new Network for integration tests or in-process testnets run via the CLI
+func New(l Logger, baseDir string, cfg Config) (*Network, error) {
+	// only one caller/test can create and use a network at a time
+	l.Log("acquiring test network lock")
+	lock.Lock()
+
+	network := &Network{
+		Logger:     l,
+		BaseDir:    baseDir,
+		Validators: make([]*Validator, cfg.NumValidators),
+		Config:     cfg,
+	}
+
+	l.Logf("preparing test network with chain-id \"%s\"\n", cfg.ChainID)
+
+	monikers := make([]string, cfg.NumValidators)
+	nodeIDs := make([]string, cfg.NumValidators)
+	valPubKeys := make([]cryptotypes.PubKey, cfg.NumValidators)
+
+	var (
+		genAccounts []authtypes.GenesisAccount
+		genBalances []banktypes.Balance
+		genFiles    []string
+	)
+
+	buf := bufio.NewReader(os.Stdin)
+
+	// generate private keys, node IDs, and initial transactions
+	for i := 0; i < cfg.NumValidators; i++ {
+		appCfg := srvconfig.DefaultConfig()
+		appCfg.Pruning = cfg.PruningStrategy
+		appCfg.MinGasPrices = cfg.MinGasPrices
+		appCfg.API.Enable = true
+		appCfg.API.Swagger = false
+		appCfg.Telemetry.Enabled = false
+
+		ctx := server.NewDefaultContext()
+		cmtCfg := ctx.Config
+		cmtCfg.Consensus.TimeoutCommit = cfg.TimeoutCommit
+
+		// Only allow the first validator to expose an RPC, API and gRPC
+		// server/client due to CometBFT in-process constraints.
+		apiAddr := ""
+		cmtCfg.RPC.ListenAddress = ""
+		appCfg.GRPC.Enable = false
+		appCfg.GRPCWeb.Enable = false
+		apiListenAddr := ""
+		if i == 0 {
+			if cfg.APIAddress != "" {
+				apiListenAddr = cfg.APIAddress
+			} else {
+				if len(portPool) == 0 {
+					return nil, fmt.Errorf("failed to get port for API server")
+				}
+				port := <-portPool
+				apiListenAddr = fmt.Sprintf("tcp://0.0.0.0:%s", port)
+			}
+
+			appCfg.API.Address = apiListenAddr
+			apiURL, err := url.Parse(apiListenAddr)
+			if err != nil {
+				return nil, err
+			}
+			apiAddr = fmt.Sprintf("http://%s:%s", apiURL.Hostname(), apiURL.Port())
+
+			if cfg.RPCAddress != "" {
+				cmtCfg.RPC.ListenAddress = cfg.RPCAddress
+			} else {
+				if len(portPool) == 0 {
+					return nil, fmt.Errorf("failed to get port for RPC server")
+				}
+				port := <-portPool
+				cmtCfg.RPC.ListenAddress = fmt.Sprintf("tcp://0.0.0.0:%s", port)
+			}
+
+			if cfg.GRPCAddress != "" {
+				appCfg.GRPC.Address = cfg.GRPCAddress
+			} else {
+				if len(portPool) == 0 {
+					return nil, fmt.Errorf("failed to get port for GRPC server")
+				}
+				port := <-portPool
+				appCfg.GRPC.Address = fmt.Sprintf("0.0.0.0:%s", port)
+			}
+			appCfg.GRPC.Enable = true
+			appCfg.GRPCWeb.Enable = true
+		}
+
+		logger := log.NewNopLogger()
+		if cfg.EnableLogging {
+			logger = log.NewLogger(os.Stdout) // TODO(mr): enable selection of log destination.
+		}
+
+		ctx.Logger = logger
+
+		nodeDirName := fmt.Sprintf("node%d", i)
+		nodeDir := filepath.Join(network.BaseDir, nodeDirName, "simd")
+		clientDir := filepath.Join(network.BaseDir, nodeDirName, "simcli")
+		gentxsDir := filepath.Join(network.BaseDir, "gentxs")
+
+		err := os.MkdirAll(filepath.Join(nodeDir, "config"), 0o755)
+		if err != nil {
+			return nil, err
+		}
+
+		err = os.MkdirAll(clientDir, 0o755)
+		if err != nil {
+			return nil, err
+		}
+
+		cmtCfg.SetRoot(nodeDir)
+		cmtCfg.Moniker = nodeDirName
+		monikers[i] = nodeDirName
+
+		if len(portPool) == 0 {
+			return nil, fmt.Errorf("failed to get port for Proxy server")
+		}
+		port := <-portPool
+		proxyAddr := fmt.Sprintf("tcp://0.0.0.0:%s", port)
+		cmtCfg.ProxyApp = proxyAddr
+
+		if len(portPool) == 0 {
+			return nil, fmt.Errorf("failed to get port for Proxy server")
+		}
+		port = <-portPool
+		p2pAddr := fmt.Sprintf("tcp://0.0.0.0:%s", port)
+		cmtCfg.P2P.ListenAddress = p2pAddr
+		cmtCfg.P2P.AddrBookStrict = false
+		cmtCfg.P2P.AllowDuplicateIP = true
+
+		nodeID, pubKey, err := genutil.InitializeNodeValidatorFiles(cmtCfg)
+		if err != nil {
+			return nil, err
+		}
+
+		nodeIDs[i] = nodeID
+		valPubKeys[i] = pubKey
+
+		kb, err := keyring.New(sdk.KeyringServiceName(), keyring.BackendTest, clientDir, buf, cfg.Codec, cfg.KeyringOptions...)
+		if err != nil {
+			return nil, err
+		}
+
+		keyringAlgos, _ := kb.SupportedAlgorithms()
+		algo, err := keyring.NewSigningAlgoFromString(cfg.SigningAlgo, keyringAlgos)
+		if err != nil {
+			return nil, err
+		}
+
+		var mnemonic string
+		if i < len(cfg.Mnemonics) {
+			mnemonic = cfg.Mnemonics[i]
+		}
+
+		addr, secret, err := testutil.GenerateSaveCoinKey(kb, nodeDirName, mnemonic, true, algo)
+		if err != nil {
+			return nil, err
+		}
+
+		// if PrintMnemonic is set to true, we print the first validator node's secret to the network's logger
+		// for debugging and manual testing
+		if cfg.PrintMnemonic && i == 0 {
+			printMnemonic(l, secret)
+		}
+
+		info := map[string]string{"secret": secret}
+		infoBz, err := json.Marshal(info)
+		if err != nil {
+			return nil, err
+		}
+
+		// save private key seed words
+		err = writeFile(fmt.Sprintf("%v.json", "key_seed"), clientDir, infoBz)
+		if err != nil {
+			return nil, err
+		}
+
+		balances := sdk.NewCoins(
+			sdk.NewCoin(fmt.Sprintf("%stoken", nodeDirName), cfg.AccountTokens),
+			sdk.NewCoin(cfg.BondDenom, cfg.StakingTokens),
+		)
+
+		genFiles = append(genFiles, cmtCfg.GenesisFile())
+		genBalances = append(genBalances, banktypes.Balance{Address: addr.String(), Coins: balances.Sort()})
+		genAccounts = append(genAccounts, authtypes.NewBaseAccount(addr, nil, 0, 0))
+
+		commission, err := sdkmath.LegacyNewDecFromStr("0.5")
+		if err != nil {
+			return nil, err
+		}
+
+		createValMsg, err := stakingtypes.NewMsgCreateValidator(
+			sdk.ValAddress(addr).String(),
+			valPubKeys[i],
+			sdk.NewCoin(cfg.BondDenom, cfg.BondedTokens),
+			stakingtypes.NewDescription(nodeDirName, "", "", "", ""),
+			stakingtypes.NewCommissionRates(commission, sdkmath.LegacyOneDec(), sdkmath.LegacyOneDec()),
+			sdkmath.OneInt(),
+		)
+		if err != nil {
+			return nil, err
+		}
+
+		p2pURL, err := url.Parse(p2pAddr)
+		if err != nil {
+			return nil, err
+		}
+
+		memo := fmt.Sprintf("%s@%s:%s", nodeIDs[i], p2pURL.Hostname(), p2pURL.Port())
+		fee := sdk.NewCoins(sdk.NewCoin(fmt.Sprintf("%stoken", nodeDirName), sdkmath.NewInt(0)))
+		txBuilder := cfg.TxConfig.NewTxBuilder()
+		err = txBuilder.SetMsgs(createValMsg)
+		if err != nil {
+			return nil, err
+		}
+		txBuilder.SetFeeAmount(fee)    // Arbitrary fee
+		txBuilder.SetGasLimit(1000000) // Need at least 100386
+		txBuilder.SetMemo(memo)
+
+		txFactory := tx.Factory{}
+		txFactory = txFactory.
+			WithChainID(cfg.ChainID).
+			WithMemo(memo).
+			WithKeybase(kb).
+			WithTxConfig(cfg.TxConfig)
+
+		err = tx.Sign(context.Background(), txFactory, nodeDirName, txBuilder, true)
+		if err != nil {
+			return nil, err
+		}
+
+		txBz, err := cfg.TxConfig.TxJSONEncoder()(txBuilder.GetTx())
+		if err != nil {
+			return nil, err
+		}
+		err = writeFile(fmt.Sprintf("%v.json", nodeDirName), gentxsDir, txBz)
+		if err != nil {
+			return nil, err
+		}
+		srvconfig.WriteConfigFile(filepath.Join(nodeDir, "config", "app.toml"), appCfg)
+
+		clientCtx := client.Context{}.
+			WithKeyringDir(clientDir).
+			WithKeyring(kb).
+			WithHomeDir(cmtCfg.RootDir).
+			WithChainID(cfg.ChainID).
+			WithInterfaceRegistry(cfg.InterfaceRegistry).
+			WithCodec(cfg.Codec).
+			WithLegacyAmino(cfg.LegacyAmino).
+			WithTxConfig(cfg.TxConfig).
+			WithAccountRetriever(cfg.AccountRetriever).
+			WithNodeURI(cmtCfg.RPC.ListenAddress)
+
+		// Provide ChainID here since we can't modify it in the Comet config.
+		ctx.Viper.Set(flags.FlagChainID, cfg.ChainID)
+
+		network.Validators[i] = &Validator{
+			AppConfig:  appCfg,
+			ClientCtx:  clientCtx,
+			Ctx:        ctx,
+			Dir:        filepath.Join(network.BaseDir, nodeDirName),
+			NodeID:     nodeID,
+			PubKey:     pubKey,
+			Moniker:    nodeDirName,
+			RPCAddress: cmtCfg.RPC.ListenAddress,
+			P2PAddress: cmtCfg.P2P.ListenAddress,
+			APIAddress: apiAddr,
+			Address:    addr,
+			ValAddress: sdk.ValAddress(addr),
+		}
+	}
+
+	err := initGenFiles(cfg, genAccounts, genBalances, genFiles)
+	if err != nil {
+		return nil, err
+	}
+	err = collectGenFiles(cfg, network.Validators, network.BaseDir)
+	if err != nil {
+		return nil, err
+	}
+
+	l.Log("starting test network...")
+	for idx, v := range network.Validators {
+		if err := startInProcess(cfg, v); err != nil {
+			return nil, err
+		}
+		l.Log("started validator", idx)
+	}
+
+	height, err := network.LatestHeight()
+	if err != nil {
+		return nil, err
+	}
+
+	l.Log("started test network at height:", height)
+
+	// Ensure we cleanup incase any test was abruptly halted (e.g. SIGINT) as any
+	// defer in a test would not be called.
+	trapSignal(network.Cleanup)
+
+	return network, nil
+}
+
+// trapSignal traps SIGINT and SIGTERM and calls os.Exit once a signal is received.
+func trapSignal(cleanupFunc func()) {
+	sigs := make(chan os.Signal, 1)
+	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
+
+	go func() {
+		sig := <-sigs
+
+		if cleanupFunc != nil {
+			cleanupFunc()
+		}
+		exitCode := 128
+
+		switch sig {
+		case syscall.SIGINT:
+			exitCode += int(syscall.SIGINT)
+		case syscall.SIGTERM:
+			exitCode += int(syscall.SIGTERM)
+		}
+
+		os.Exit(exitCode)
+	}()
+}
+
+// LatestHeight returns the latest height of the network or an error if the
+// query fails or no validators exist.
+func (n *Network) LatestHeight() (int64, error) {
+	if len(n.Validators) == 0 {
+		return 0, errors.New("no validators available")
+	}
+
+	ticker := time.NewTicker(time.Second)
+	defer ticker.Stop()
+
+	timeout := time.NewTimer(time.Second * 5)
+	defer timeout.Stop()
+
+	var latestHeight int64
+	val := n.Validators[0]
+	queryClient := cmtservice.NewServiceClient(val.ClientCtx)
+
+	for {
+		select {
+		case <-timeout.C:
+			return latestHeight, errors.New("timeout exceeded waiting for block")
+		case <-ticker.C:
+			done := make(chan struct{})
+			go func() {
+				res, err := queryClient.GetLatestBlock(context.Background(), &cmtservice.GetLatestBlockRequest{})
+				if err == nil && res != nil {
+					latestHeight = res.SdkBlock.Header.Height
+				}
+				done <- struct{}{}
+			}()
+			select {
+			case <-timeout.C:
+				return latestHeight, errors.New("timeout exceeded waiting for block")
+			case <-done:
+				if latestHeight != 0 {
+					return latestHeight, nil
+				}
+			}
+		}
+	}
+}
+
+// WaitForHeight performs a blocking check where it waits for a block to be
+// committed after a given block. If that height is not reached within a timeout,
+// an error is returned. Regardless, the latest height queried is returned.
+func (n *Network) WaitForHeight(h int64) (int64, error) {
+	return n.WaitForHeightWithTimeout(h, 10*time.Second)
+}
+
+// WaitForHeightWithTimeout is the same as WaitForHeight except the caller can
+// provide a custom timeout.
+func (n *Network) WaitForHeightWithTimeout(h int64, t time.Duration) (int64, error) {
+	ticker := time.NewTicker(time.Second)
+	defer ticker.Stop()
+
+	timeout := time.NewTimer(t)
+	defer timeout.Stop()
+
+	if len(n.Validators) == 0 {
+		return 0, errors.New("no validators available")
+	}
+
+	var latestHeight int64
+	val := n.Validators[0]
+	queryClient := cmtservice.NewServiceClient(val.ClientCtx)
+
+	for {
+		select {
+		case <-timeout.C:
+			return latestHeight, errors.New("timeout exceeded waiting for block")
+		case <-ticker.C:
+
+			res, err := queryClient.GetLatestBlock(context.Background(), &cmtservice.GetLatestBlockRequest{})
+			if err == nil && res != nil {
+				latestHeight = res.GetSdkBlock().Header.Height
+				if latestHeight >= h {
+					return latestHeight, nil
+				}
+			}
+		}
+	}
+}
+
+// RetryForBlocks will wait for the next block and execute the function provided.
+// It will do this until the function returns a nil error or until the number of
+// blocks has been reached.
+func (n *Network) RetryForBlocks(retryFunc func() error, blocks int) error {
+	for i := 0; i < blocks; i++ {
+		n.WaitForNextBlock()
+		err := retryFunc()
+		if err == nil {
+			return nil
+		}
+		// we've reached the last block to wait, return the error
+		if i == blocks-1 {
+			return err
+		}
+	}
+	return nil
+}
+
+// WaitForNextBlock waits for the next block to be committed, returning an error
+// upon failure.
+func (n *Network) WaitForNextBlock() error {
+	lastBlock, err := n.LatestHeight()
+	if err != nil {
+		return err
+	}
+
+	_, err = n.WaitForHeight(lastBlock + 1)
+	if err != nil {
+		return err
+	}
+
+	return err
+}
+
+// Cleanup removes the root testing (temporary) directory and stops both the
+// CometBFT and API services. It allows other callers to create and start
+// test networks. This method must be called when a test is finished, typically
+// in a defer.
+func (n *Network) Cleanup() {
+	defer func() {
+		lock.Unlock()
+		n.Logger.Log("released test network lock")
+	}()
+
+	n.Logger.Log("cleaning up test network...")
+
+	for _, v := range n.Validators {
+		// cancel the validator's context which will signal to the gRPC and API
+		// goroutines that they should gracefully exit.
+		v.cancelFn()
+
+		if err := v.errGroup.Wait(); err != nil {
+			n.Logger.Log("unexpected error waiting for validator gRPC and API processes to exit", "err", err)
+		}
+
+		if v.tmNode != nil && v.tmNode.IsRunning() {
+			if err := v.tmNode.Stop(); err != nil {
+				n.Logger.Log("failed to stop validator CometBFT node", "err", err)
+			}
+		}
+
+		if v.grpcWeb != nil {
+			_ = v.grpcWeb.Close()
+		}
+
+		if v.app != nil {
+			if err := v.app.Close(); err != nil {
+				n.Logger.Log("failed to stop validator ABCI application", "err", err)
+			}
+		}
+	}
+
+	time.Sleep(100 * time.Millisecond)
+
+	if n.Config.CleanupDir {
+		_ = os.RemoveAll(n.BaseDir)
+	}
+
+	n.Logger.Log("finished cleaning up test network")
+}
+
+// printMnemonic prints a provided mnemonic seed phrase on a network logger
+// for debugging and manual testing
+func printMnemonic(l Logger, secret string) {
+	lines := []string{
+		"THIS MNEMONIC IS FOR TESTING PURPOSES ONLY",
+		"DO NOT USE IN PRODUCTION",
+		"",
+		strings.Join(strings.Fields(secret)[0:8], " "),
+		strings.Join(strings.Fields(secret)[8:16], " "),
+		strings.Join(strings.Fields(secret)[16:24], " "),
+	}
+
+	lineLengths := make([]int, len(lines))
+	for i, line := range lines {
+		lineLengths[i] = len(line)
+	}
+
+	maxLineLength := 0
+	for _, lineLen := range lineLengths {
+		if lineLen > maxLineLength {
+			maxLineLength = lineLen
+		}
+	}
+
+	l.Log("\n")
+	l.Log(strings.Repeat("+", maxLineLength+8))
+	for _, line := range lines {
+		l.Logf("++  %s  ++\n", centerText(line, maxLineLength))
+	}
+	l.Log(strings.Repeat("+", maxLineLength+8))
+	l.Log("\n")
+}
+
+// centerText centers text across a fixed width, filling either side with whitespace buffers
+func centerText(text string, width int) string {
+	textLen := len(text)
+	leftBuffer := strings.Repeat(" ", (width-textLen)/2)
+	rightBuffer := strings.Repeat(" ", (width-textLen)/2+(width-textLen)%2)
+
+	return fmt.Sprintf("%s%s%s", leftBuffer, text, rightBuffer)
+}

testutil/network/util.go

@@ -0,0 +1,236 @@
+package network
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net"
+	"os"
+	"path/filepath"
+
+	cmtcfg "github.com/cometbft/cometbft/config"
+	"github.com/cometbft/cometbft/node"
+	"github.com/cometbft/cometbft/p2p"
+	pvm "github.com/cometbft/cometbft/privval"
+	"github.com/cometbft/cometbft/proxy"
+	"github.com/cometbft/cometbft/rpc/client/local"
+	cmttypes "github.com/cometbft/cometbft/types"
+	cmttime "github.com/cometbft/cometbft/types/time"
+	"golang.org/x/sync/errgroup"
+
+	"cosmossdk.io/log"
+
+	"github.com/cosmos/cosmos-sdk/server"
+	"github.com/cosmos/cosmos-sdk/server/api"
+	servergrpc "github.com/cosmos/cosmos-sdk/server/grpc"
+	servercmtlog "github.com/cosmos/cosmos-sdk/server/log"
+	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
+	banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
+	"github.com/cosmos/cosmos-sdk/x/genutil"
+	genutiltypes "github.com/cosmos/cosmos-sdk/x/genutil/types"
+)
+
+func startInProcess(cfg Config, val *Validator) error {
+	logger := val.Ctx.Logger
+	cmtCfg := val.Ctx.Config
+	cmtCfg.Instrumentation.Prometheus = false
+
+	if err := val.AppConfig.ValidateBasic(); err != nil {
+		return err
+	}
+
+	nodeKey, err := p2p.LoadOrGenNodeKey(cmtCfg.NodeKeyFile())
+	if err != nil {
+		return err
+	}
+
+	app := cfg.AppConstructor(*val)
+	val.app = app
+
+	appGenesisProvider := func() (*cmttypes.GenesisDoc, error) {
+		appGenesis, err := genutiltypes.AppGenesisFromFile(cmtCfg.GenesisFile())
+		if err != nil {
+			return nil, err
+		}
+
+		return appGenesis.ToGenesisDoc()
+	}
+
+	cmtApp := server.NewCometABCIWrapper(app)
+	tmNode, err := node.NewNode( //resleak:notresource
+		cmtCfg,
+		pvm.LoadOrGenFilePV(cmtCfg.PrivValidatorKeyFile(), cmtCfg.PrivValidatorStateFile()),
+		nodeKey,
+		proxy.NewLocalClientCreator(cmtApp),
+		appGenesisProvider,
+		cmtcfg.DefaultDBProvider,
+		node.DefaultMetricsProvider(cmtCfg.Instrumentation),
+		servercmtlog.CometLoggerWrapper{Logger: logger.With("module", val.Moniker)},
+	)
+	if err != nil {
+		return err
+	}
+
+	if err := tmNode.Start(); err != nil {
+		return err
+	}
+	val.tmNode = tmNode
+
+	if val.RPCAddress != "" {
+		val.RPCClient = local.New(tmNode)
+	}
+
+	// We'll need a RPC client if the validator exposes a gRPC or REST endpoint.
+	if val.APIAddress != "" || val.AppConfig.GRPC.Enable {
+		val.ClientCtx = val.ClientCtx.
+			WithClient(val.RPCClient)
+
+		app.RegisterTxService(val.ClientCtx)
+		app.RegisterTendermintService(val.ClientCtx)
+		app.RegisterNodeService(val.ClientCtx, *val.AppConfig)
+	}
+
+	ctx := context.Background()
+	ctx, val.cancelFn = context.WithCancel(ctx)
+	val.errGroup, ctx = errgroup.WithContext(ctx)
+
+	grpcCfg := val.AppConfig.GRPC
+
+	if grpcCfg.Enable {
+		grpcSrv, err := servergrpc.NewGRPCServer(val.ClientCtx, app, grpcCfg)
+		if err != nil {
+			return err
+		}
+
+		// Start the gRPC server in a goroutine. Note, the provided ctx will ensure
+		// that the server is gracefully shut down.
+		val.errGroup.Go(func() error {
+			return servergrpc.StartGRPCServer(ctx, logger.With(log.ModuleKey, "grpc-server"), grpcCfg, grpcSrv)
+		})
+
+		val.grpc = grpcSrv
+	}
+
+	if val.APIAddress != "" {
+		apiSrv := api.New(val.ClientCtx, logger.With(log.ModuleKey, "api-server"), val.grpc)
+		app.RegisterAPIRoutes(apiSrv, val.AppConfig.API)
+
+		val.errGroup.Go(func() error {
+			return apiSrv.Start(ctx, *val.AppConfig)
+		})
+
+		val.api = apiSrv
+	}
+
+	return nil
+}
+
+func collectGenFiles(cfg Config, vals []*Validator, outputDir string) error {
+	genTime := cmttime.Now()
+
+	for i := 0; i < cfg.NumValidators; i++ {
+		cmtCfg := vals[i].Ctx.Config
+
+		nodeDir := filepath.Join(outputDir, vals[i].Moniker, "simd")
+		gentxsDir := filepath.Join(outputDir, "gentxs")
+
+		cmtCfg.Moniker = vals[i].Moniker
+		cmtCfg.SetRoot(nodeDir)
+
+		initCfg := genutiltypes.NewInitConfig(cfg.ChainID, gentxsDir, vals[i].NodeID, vals[i].PubKey)
+
+		genFile := cmtCfg.GenesisFile()
+		appGenesis, err := genutiltypes.AppGenesisFromFile(genFile)
+		if err != nil {
+			return err
+		}
+
+		appState, err := genutil.GenAppStateFromConfig(cfg.Codec, cfg.TxConfig,
+			cmtCfg, initCfg, appGenesis, banktypes.GenesisBalancesIterator{}, genutiltypes.DefaultMessageValidator, cfg.TxConfig.SigningContext().ValidatorAddressCodec())
+		if err != nil {
+			return err
+		}
+
+		// overwrite each validator's genesis file to have a canonical genesis time
+		if err := genutil.ExportGenesisFileWithTime(genFile, cfg.ChainID, nil, appState, genTime); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func initGenFiles(cfg Config, genAccounts []authtypes.GenesisAccount, genBalances []banktypes.Balance, genFiles []string) error {
+	// set the accounts in the genesis state
+	var authGenState authtypes.GenesisState
+	cfg.Codec.MustUnmarshalJSON(cfg.GenesisState[authtypes.ModuleName], &authGenState)
+
+	accounts, err := authtypes.PackAccounts(genAccounts)
+	if err != nil {
+		return err
+	}
+
+	authGenState.Accounts = append(authGenState.Accounts, accounts...)
+	cfg.GenesisState[authtypes.ModuleName] = cfg.Codec.MustMarshalJSON(&authGenState)
+
+	// set the balances in the genesis state
+	var bankGenState banktypes.GenesisState
+	cfg.Codec.MustUnmarshalJSON(cfg.GenesisState[banktypes.ModuleName], &bankGenState)
+
+	bankGenState.Balances = append(bankGenState.Balances, genBalances...)
+	cfg.GenesisState[banktypes.ModuleName] = cfg.Codec.MustMarshalJSON(&bankGenState)
+
+	appGenStateJSON, err := json.MarshalIndent(cfg.GenesisState, "", "  ")
+	if err != nil {
+		return err
+	}
+
+	appGenesis := genutiltypes.AppGenesis{
+		ChainID:  cfg.ChainID,
+		AppState: appGenStateJSON,
+		Consensus: &genutiltypes.ConsensusGenesis{
+			Validators: nil,
+		},
+	}
+
+	// generate empty genesis files for each validator and save
+	for i := 0; i < cfg.NumValidators; i++ {
+		if err := appGenesis.SaveAs(genFiles[i]); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func writeFile(name, dir string, contents []byte) error {
+	file := filepath.Join(dir, name)
+
+	if err := os.MkdirAll(dir, 0o755); err != nil {
+		return fmt.Errorf("could not create directory %q: %w", dir, err)
+	}
+
+	if err := os.WriteFile(file, contents, 0o600); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Get a free address for a test CometBFT server
+// protocol is either tcp, http, etc
+func FreeTCPAddr() (addr, port string, closeFn func() error, err error) {
+	l, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		return "", "", nil, err
+	}
+
+	closeFn = func() error {
+		return l.Close()
+	}
+
+	portI := l.Addr().(*net.TCPAddr).Port
+	port = fmt.Sprintf("%d", portI)
+	addr = fmt.Sprintf("tcp://0.0.0.0:%s", port)
+	return
+}