chore: remove cosmos/relayer dependency (#429)

- Migrates the minimal amount of code needed from the
[relayer](https://github.com/cosmos/relayer) repo
- Removes dependency for `cosmos/relayer`
- Removes dependency for `strangelove-ventures/cometbft-client`

~Todo:~
- ~As this is modified code from the
[relayer](https://github.com/cosmos/relayer), what license if any should
we include in the header of those files? I've also modified them
(deleted a bunch of stuff, and added more code quality improvements)~
- ~Is feegrant.go needed, feels like it can be removed and other parts
related to it~
- ~Future PRs can remove references to strangelove cometbft client, tho
we do have to satisfy the `CometRPC interface`, `ABCIClient interface`
etc. (not sure if it's worth the extra effort)~
- ~Decide on the name of the relayer package, the clients would
currently use `relayerclient.Whatever`~
 
 [Closes](babylonlabs-io/pm#149)

CHANGELOG.md

@@ -44,6 +44,7 @@ This PR contains a series of PRs on multi-staking support and BTC stakingintegra
 - [#391](https://github.com/babylonlabs-io/babylon/pull/391) Fix e2e `TestBTCRewardsDistribution` flunky
 check of rewards
 - [#419](https://github.com/babylonlabs-io/babylon/pull/419) Add new modules to swagger config
+- [#429](https://github.com/babylonlabs-io/babylon/pull/429) chore: remove cosmos/relayer dependency
 
 ### Bug fixes
 

client/babylonclient/account.go

@@ -0,0 +1,78 @@
+// This file is derived from the Cosmos Relayer repository (https://github.com/cosmos/relayer),
+// originally licensed under the Apache License, Version 2.0.
+
+package babylonclient
+
+import (
+	"context"
+	"fmt"
+	"strconv"
+
+	"github.com/cosmos/cosmos-sdk/client"
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	grpctypes "github.com/cosmos/cosmos-sdk/types/grpc"
+	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/metadata"
+)
+
+var _ client.AccountRetriever = &CosmosProvider{}
+
+// GetAccount queries for an account given an address and a block height. An
+// error is returned if the query or decoding fails.
+func (cc *CosmosProvider) GetAccount(clientCtx client.Context, addr sdk.AccAddress) (client.Account, error) {
+	account, _, err := cc.GetAccountWithHeight(clientCtx, addr)
+	return account, err
+}
+
+// GetAccountWithHeight queries for an account given an address. Returns the
+// height of the query with the account. An error is returned if the query
+// or decoding fails.
+func (cc *CosmosProvider) GetAccountWithHeight(_ client.Context, addr sdk.AccAddress) (client.Account, int64, error) {
+	var header metadata.MD
+	address, err := cc.EncodeBech32AccAddr(addr)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	queryClient := authtypes.NewQueryClient(cc)
+	res, err := queryClient.Account(context.Background(), &authtypes.QueryAccountRequest{Address: address}, grpc.Header(&header))
+	if err != nil {
+		return nil, 0, err
+	}
+
+	blockHeight := header.Get(grpctypes.GRPCBlockHeightHeader)
+	if l := len(blockHeight); l != 1 {
+		return nil, 0, fmt.Errorf("unexpected '%s' header length; got %d, expected: %d", grpctypes.GRPCBlockHeightHeader, l, 1)
+	}
+
+	nBlockHeight, err := strconv.Atoi(blockHeight[0])
+	if err != nil {
+		return nil, 0, fmt.Errorf("failed to parse block height: %w", err)
+	}
+
+	var acc sdk.AccountI
+	if err := cc.Cdc.InterfaceRegistry.UnpackAny(res.Account, &acc); err != nil {
+		return nil, 0, err
+	}
+
+	return acc, int64(nBlockHeight), nil
+}
+
+// EnsureExists returns an error if no account exists for the given address else nil.
+func (cc *CosmosProvider) EnsureExists(clientCtx client.Context, addr sdk.AccAddress) error {
+	if _, err := cc.GetAccount(clientCtx, addr); err != nil {
+		return err
+	}
+	return nil
+}
+
+// GetAccountNumberSequence returns sequence and account number for the given address.
+// It returns an error if the account couldn't be retrieved from the state.
+func (cc *CosmosProvider) GetAccountNumberSequence(clientCtx client.Context, addr sdk.AccAddress) (uint64, uint64, error) {
+	acc, err := cc.GetAccount(clientCtx, addr)
+	if err != nil {
+		return 0, 0, err
+	}
+	return acc.GetAccountNumber(), acc.GetSequence(), nil
+}

client/babylonclient/bech32_hack.go

@@ -0,0 +1,31 @@
+// This file is derived from the Cosmos Relayer repository (https://github.com/cosmos/relayer),
+// originally licensed under the Apache License, Version 2.0.
+
+package babylonclient
+
+import (
+	"sync"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+)
+
+// This file is cursed and this mutex is too
+// you don't want none of this dewey cox.
+var sdkConfigMutex sync.Mutex
+
+// SetSDKContext sets the SDK config to the proper bech32 prefixes.
+// Don't use this unless you know what you're doing.
+// TODO: :dagger: :knife: :chainsaw: remove this function
+func (cc *CosmosProvider) SetSDKContext() func() {
+	return SetSDKConfigContext(cc.PCfg.AccountPrefix)
+}
+
+// SetSDKConfigContext sets the SDK config to the given bech32 prefixes
+func SetSDKConfigContext(prefix string) func() {
+	sdkConfigMutex.Lock()
+	sdkConf := sdk.GetConfig()
+	sdkConf.SetBech32PrefixForAccount(prefix, prefix+"pub")
+	sdkConf.SetBech32PrefixForValidator(prefix+"valoper", prefix+"valoperpub")
+	sdkConf.SetBech32PrefixForConsensusNode(prefix+"valcons", prefix+"valconspub")
+	return sdkConfigMutex.Unlock
+}

client/babylonclient/chain_provider.go

@@ -0,0 +1,58 @@
+// This file is derived from the Cosmos Relayer repository (https://github.com/cosmos/relayer),
+// originally licensed under the Apache License, Version 2.0.
+
+package babylonclient
+
+import (
+	"context"
+)
+
+type BroadcastMode string
+
+const (
+	BroadcastModeSingle BroadcastMode = "single"
+	BroadcastModeBatch  BroadcastMode = "batch"
+)
+
+type ProviderConfig interface {
+	NewProvider(homepath string, chainName string) (ChainProvider, error)
+	Validate() error
+	BroadcastMode() BroadcastMode
+}
+
+type RelayerMessage interface {
+	Type() string
+	MsgBytes() ([]byte, error)
+}
+
+type RelayerTxResponse struct {
+	Height    int64
+	TxHash    string
+	Codespace string
+	Code      uint32
+	Data      string
+	Events    []RelayerEvent
+}
+
+type RelayerEvent struct {
+	EventType  string
+	Attributes map[string]string
+}
+
+type ChainProvider interface {
+	Init() error
+	SendMessagesToMempool(
+		ctx context.Context,
+		msgs []RelayerMessage,
+		memo string,
+		asyncCtx context.Context,
+		asyncCallbacks []func(*RelayerTxResponse, error),
+	) error
+	ChainName() string
+	ChainId() string
+	ProviderConfig() ProviderConfig
+	Key() string
+	Address() (string, error)
+	Timeout() string
+	SetRpcAddr(rpcAddr string) error
+}

client/babylonclient/client_wrapper.go

@@ -0,0 +1,111 @@
+// This file is derived from the Cosmos Relayer repository (https://github.com/cosmos/relayer),
+// originally licensed under the Apache License, Version 2.0.
+
+package babylonclient
+
+import (
+	"context"
+	"github.com/cometbft/cometbft/libs/bytes"
+	rpcclient "github.com/cometbft/cometbft/rpc/client"
+	coretypes "github.com/cometbft/cometbft/rpc/core/types"
+	tmtypes "github.com/cometbft/cometbft/types"
+)
+
+type RPCClient struct {
+	c rpcclient.Client
+}
+
+func NewRPCClient(c rpcclient.Client) RPCClient {
+	return RPCClient{c: c}
+}
+
+func (r RPCClient) ABCIInfo(ctx context.Context) (*coretypes.ResultABCIInfo, error) {
+	return r.c.ABCIInfo(ctx)
+}
+
+func (r RPCClient) ABCIQuery(
+	ctx context.Context,
+	path string,
+	data bytes.HexBytes,
+) (*coretypes.ResultABCIQuery, error) {
+	return r.c.ABCIQuery(ctx, path, (data))
+}
+
+func (r RPCClient) ABCIQueryWithOptions(
+	ctx context.Context,
+	path string,
+	data bytes.HexBytes,
+	opts rpcclient.ABCIQueryOptions,
+) (*coretypes.ResultABCIQuery, error) {
+	return r.c.ABCIQueryWithOptions(ctx, path, data, opts)
+}
+
+func (r RPCClient) BroadcastTxCommit(ctx context.Context, tx tmtypes.Tx) (*coretypes.ResultBroadcastTxCommit, error) {
+	return r.c.BroadcastTxCommit(ctx, tx)
+}
+
+func (r RPCClient) BroadcastTxAsync(ctx context.Context, tx tmtypes.Tx) (*coretypes.ResultBroadcastTx, error) {
+	return r.c.BroadcastTxAsync(ctx, tx)
+}
+
+func (r RPCClient) BroadcastTxSync(ctx context.Context, tx tmtypes.Tx) (*coretypes.ResultBroadcastTx, error) {
+	return r.c.BroadcastTxSync(ctx, tx)
+}
+
+func (r RPCClient) Validators(
+	ctx context.Context,
+	height *int64,
+	page, perPage *int,
+) (*coretypes.ResultValidators, error) {
+	return r.c.Validators(ctx, height, page, perPage)
+}
+
+func (r RPCClient) Status(ctx context.Context) (*coretypes.ResultStatus, error) {
+	return r.c.Status(ctx)
+}
+
+func (r RPCClient) Block(ctx context.Context, height *int64) (*coretypes.ResultBlock, error) {
+	return r.c.Block(ctx, height)
+}
+
+func (r RPCClient) BlockByHash(ctx context.Context, hash []byte) (*coretypes.ResultBlock, error) {
+	return r.c.BlockByHash(ctx, hash)
+}
+
+func (r RPCClient) BlockResults(ctx context.Context, height *int64) (*coretypes.ResultBlockResults, error) {
+	return r.c.BlockResults(ctx, height)
+}
+
+func (r RPCClient) BlockchainInfo(
+	ctx context.Context,
+	minHeight, maxHeight int64,
+) (*coretypes.ResultBlockchainInfo, error) {
+	return r.c.BlockchainInfo(ctx, minHeight, maxHeight)
+}
+
+func (r RPCClient) Commit(ctx context.Context, height *int64) (*coretypes.ResultCommit, error) {
+	return r.c.Commit(ctx, height)
+}
+
+func (r RPCClient) Tx(ctx context.Context, hash []byte, prove bool) (*coretypes.ResultTx, error) {
+	return r.c.Tx(ctx, hash, prove)
+}
+
+func (r RPCClient) TxSearch(
+	ctx context.Context,
+	query string,
+	prove bool,
+	page, perPage *int,
+	orderBy string,
+) (*coretypes.ResultTxSearch, error) {
+	return r.c.TxSearch(ctx, query, prove, page, perPage, orderBy)
+}
+
+func (r RPCClient) BlockSearch(
+	ctx context.Context,
+	query string,
+	page, perPage *int,
+	orderBy string,
+) (*coretypes.ResultBlockSearch, error) {
+	return r.c.BlockSearch(ctx, query, page, perPage, orderBy)
+}