wasm

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 Go to latest Published: Apr 12, 2023 License: Apache-2.0 Imports: 45 Imported by: 0

README

Wasm Module

This should be a brief overview of the functionality

Configuration

You can add the following section to config/app.toml:

[wasm]
# This is the maximum sdk gas (wasm and storage) that we allow for any x/wasm "smart" queries
query_gas_limit = 300000
# This defines the memory size for Wasm modules that we can keep cached to speed-up instantiation
# The value is in MiB not bytes
memory_cache_size = 300

The values can also be set via CLI flags on with the start command:

--wasm.memory_cache_size uint32     Sets the size in MiB (NOT bytes) of an in-memory cache for wasm modules. Set to 0 to disable. (default 100)
--wasm.query_gas_limit uint         Set the max gas that can be spent on executing a query with a Wasm contract (default 3000000)

Events

A number of events are returned to allow good indexing of the transactions from smart contracts.

Every call to Instantiate or Execute will be tagged with the info on the contract that was executed and who executed it. It should look something like this (with different addresses). The module is always wasm, and code_id is only present when Instantiating a contract, so you can subscribe to new instances, it is omitted on Execute. There is also an action tag which is auto-added by the Cosmos SDK and has a value of either store-code, instantiate or execute depending on which message was sent:

{
    "Type": "message",
    "Attr": [
        {
            "key": "module",
            "value": "wasm"
        },
        {
            "key": "action",
            "value": "instantiate"
        },
        {
            "key": "signer",
            "value": "cosmos1vx8knpllrj7n963p9ttd80w47kpacrhuts497x"
        },
        {
            "key": "code_id",
            "value": "1"
        },
        {
            "key": "_contract_address",
            "value": "0x5A8D648DEE57b2fc90D98DC17fa887159b69638b"
        }
    ]
}

If any funds were transferred to the contract as part of the message, or if the contract released funds as part of it's executions, it will receive the typical events associated with sending tokens from bank. In this case, we instantiate the contract and provide a initial balance in the same MsgInstantiateContract. We see the following events in addition to the above one:

[
    {
        "Type": "transfer",
        "Attr": [
            {
                "key": "recipient",
                "value": "0x5A8D648DEE57b2fc90D98DC17fa887159b69638b"
            },
            {
                "key": "sender",
                "value": "cosmos1ffnqn02ft2psvyv4dyr56nnv6plllf9pm2kpmv"
            },
            {
                "key": "amount",
                "value": "100000denom"
            }
        ]
    }
]

Finally, the contract itself can emit a "custom event" on Execute only (not on Init). There is one event per contract, so if one contract calls a second contract, you may receive one event for the original contract and one for the re-invoked contract. All attributes from the contract are passed through verbatim, and we add a _contract_address attribute that contains the actual contract that emitted that event. Here is an example from the escrow contract successfully releasing funds to the destination address:

{
    "Type": "wasm",
    "Attr": [
        {
            "key": "_contract_address",
            "value": "0x5A8D648DEE57b2fc90D98DC17fa887159b69638b"
        },
        {
            "key": "action",
            "value": "release"
        },
        {
            "key": "destination",
            "value": "cosmos14k7v7ms4jxkk2etmg9gljxjm4ru3qjdugfsflq"
        }
    ]
}
Pulling this all together

We will invoke an escrow contract to release to the designated beneficiary. The escrow was previously loaded with 100000denom (from the above example). In this transaction, we send 5000denom along with the MsgExecuteContract and the contract releases the entire funds (105000denom) to the beneficiary.

We will see all the following events, where you should be able to reconstruct the actions (remember there are two events for each transfer). We see (1) the initial transfer of funds to the contract, (2) the contract custom event that it released funds (3) the transfer of funds from the contract to the beneficiary and (4) the generic x/wasm event stating that the contract was executed (which always appears, while 2 is optional and has information as reliable as the contract):

[
    {
        "Type": "transfer",
        "Attr": [
            {
                "key": "recipient",
                "value": "0x5A8D648DEE57b2fc90D98DC17fa887159b69638b"
            },
            {
                "key": "sender",
                "value": "cosmos1zm074khx32hqy20hlshlsd423n07pwlu9cpt37"
            },
            {
                "key": "amount",
                "value": "5000denom"
            }
        ]
    },
    {
        "Type": "wasm",
        "Attr": [
            {
                "key": "_contract_address",
                "value": "0x5A8D648DEE57b2fc90D98DC17fa887159b69638b"
            },
            {
                "key": "action",
                "value": "release"
            },
            {
                "key": "destination",
                "value": "cosmos14k7v7ms4jxkk2etmg9gljxjm4ru3qjdugfsflq"
            }
        ]
    },
    {
        "Type": "transfer",
        "Attr": [
            {
                "key": "recipient",
                "value": "cosmos14k7v7ms4jxkk2etmg9gljxjm4ru3qjdugfsflq"
            },
            {
                "key": "sender",
                "value": "0x5A8D648DEE57b2fc90D98DC17fa887159b69638b"
            },
            {
                "key": "amount",
                "value": "105000denom"
            }
        ]
    },
    {
        "Type": "message",
        "Attr": [
            {
                "key": "module",
                "value": "wasm"
            },
            {
                "key": "action",
                "value": "execute"
            },
            {
                "key": "signer",
                "value": "cosmos1zm074khx32hqy20hlshlsd423n07pwlu9cpt37"
            },
            {
                "key": "_contract_address",
                "value": "0x5A8D648DEE57b2fc90D98DC17fa887159b69638b"
            }
        ]
    }
]

A note on this format. This is what we return from our module. However, it seems to me that many events with the same Type get merged together somewhere along the stack, so in this case, you may end up with one "transfer" event with the info for both transfers. Double check when evaluating the event logs, I will document better with more experience, especially when I find out the entire path for the events.

Messages

TODO

CLI

TODO - working, but not the nicest interface (json + bash = bleh). Use to upload, but I suggest to focus on frontend / js tooling

Rest

TODO - main supported interface, under rapid change

Documentation

Overview

nolint autogenerated code using github.com/rigelrozanski/multitool aliases generated for the following subdirectories: ALIASGEN: github.com/okex/exchain/x/wasm/types ALIASGEN: github.com/okex/exchain/x/wasm/keeper

Index

Constants

View Source 
const (
	ModuleName                      = types.ModuleName
	StoreKey                        = types.StoreKey
	TStoreKey                       = types.TStoreKey
	QuerierRoute                    = types.QuerierRoute
	RouterKey                       = types.RouterKey
	WasmModuleEventType             = types.WasmModuleEventType
	AttributeKeyContractAddr        = types.AttributeKeyContractAddr
	ProposalTypeStoreCode           = types.ProposalTypeStoreCode
	ProposalTypeInstantiateContract = types.ProposalTypeInstantiateContract
	ProposalTypeMigrateContract     = types.ProposalTypeMigrateContract
	ProposalTypeUpdateAdmin         = types.ProposalTypeUpdateAdmin
	ProposalTypeClearAdmin          = types.ProposalTypeClearAdmin
	QueryListContractByCode         = keeper.QueryListContractByCode
	QueryGetContract                = keeper.QueryGetContract
	QueryGetContractState           = keeper.QueryGetContractState
	QueryGetCode                    = keeper.QueryGetCode
	QueryListCode                   = keeper.QueryListCode
	QueryMethodContractStateSmart   = keeper.QueryMethodContractStateSmart
	QueryMethodContractStateAll     = keeper.QueryMethodContractStateAll
	QueryMethodContractStateRaw     = keeper.QueryMethodContractStateRaw
)
View Source 
const SupportedFeatures = keeper.SupportedFeatures

Variables

View Source 
var (
	// functions aliases
	RegisterCodec             = types.RegisterLegacyAminoCodec
	RegisterInterfaces        = types.RegisterInterfaces
	ValidateGenesis           = types.ValidateGenesis
	ConvertToProposals        = types.ConvertToProposals
	GetCodeKey                = types.GetCodeKey
	GetContractAddressKey     = types.GetContractAddressKey
	GetContractStorePrefixKey = types.GetContractStorePrefix
	NewCodeInfo               = types.NewCodeInfo
	NewAbsoluteTxPosition     = types.NewAbsoluteTxPosition
	NewContractInfo           = types.NewContractInfo
	NewEnv                    = types.NewEnv
	NewWasmCoins              = types.NewWasmCoins
	DefaultWasmConfig         = types.DefaultWasmConfig
	DefaultParams             = types.DefaultParams
	InitGenesis               = keeper.InitGenesis
	ExportGenesis             = keeper.ExportGenesis
	NewMessageHandler         = keeper.NewDefaultMessageHandler
	DefaultEncoders           = keeper.DefaultEncoders
	EncodeBankMsg             = keeper.EncodeBankMsg
	NoCustomMsg               = keeper.NoCustomMsg
	//EncodeStakingMsg          = keeper.EncodeStakingMsg
	EncodeWasmMsg          = keeper.EncodeWasmMsg
	NewKeeper              = keeper.NewKeeper
	NewLegacyQuerier       = keeper.NewLegacyQuerier
	DefaultQueryPlugins    = keeper.DefaultQueryPlugins
	BankQuerier            = keeper.BankQuerier
	NoCustomQuerier        = keeper.NoCustomQuerier
	StakingQuerier         = keeper.StakingQuerier
	WasmQuerier            = keeper.WasmQuerier
	CreateTestInput        = keeper.CreateTestInput
	TestHandler            = keeper.TestHandler
	NewWasmProposalHandler = keeper.NewWasmProposalHandler
	NewQuerier             = keeper.Querier
	ContractFromPortID     = keeper.ContractFromPortID
	WithWasmEngine         = keeper.WithWasmEngine
	NewCountTXDecorator    = keeper.NewCountTXDecorator

	// variable aliases
	ModuleCdc                        = types.ModuleCdc
	DefaultCodespace                 = types.DefaultCodespace
	ErrCreateFailed                  = types.ErrCreateFailed
	ErrAccountExists                 = types.ErrAccountExists
	ErrInstantiateFailed             = types.ErrInstantiateFailed
	ErrExecuteFailed                 = types.ErrExecuteFailed
	ErrGasLimit                      = types.ErrGasLimit
	ErrInvalidGenesis                = types.ErrInvalidGenesis
	ErrNotFound                      = types.ErrNotFound
	ErrQueryFailed                   = types.ErrQueryFailed
	ErrInvalidMsg                    = types.ErrInvalidMsg
	KeyLastCodeID                    = types.KeyLastCodeID
	KeyLastInstanceID                = types.KeyLastInstanceID
	CodeKeyPrefix                    = types.CodeKeyPrefix
	ContractKeyPrefix                = types.ContractKeyPrefix
	ContractStorePrefix              = types.ContractStorePrefix
	EnableAllProposals               = types.EnableAllProposals
	DisableAllProposals              = types.DisableAllProposals
	NecessaryProposals               = types.NecessaryProposals
	ContractCodeHistoryElementPrefix = types.ContractCodeHistoryElementPrefix
	WithMessageEncoders              = keeper.WithMessageEncoders
	SetNeedParamsUpdate              = keeper.SetNeedParamsUpdate
)

Functions

func AddModuleInitFlags 

func AddModuleInitFlags(startCmd *cobra.Command)

AddModuleInitFlags implements servertypes.ModuleInitFlags interface.

func Init added in v1.6.2 

func Init()

func NewHandler 

func NewHandler(k types.ContractOpsKeeper) sdk.Handler

NewHandler returns a handler for "wasm" type messages.

func NewProxyKeeper added in v1.6.2 

func NewProxyKeeper() keeper.Keeper

func NewWasmSimulator added in v1.6.2 

func NewWasmSimulator() simulator.Simulator

func ReadWasmConfig 

func ReadWasmConfig() (types.WasmConfig, error)

ReadWasmConfig reads the wasm specifig configuration

func ValidateChannelParams 

func ValidateChannelParams(channelID string) error

func WasmConfig added in v1.6.2 

func WasmConfig() types.WasmConfig

func WasmDir added in v1.6.2 

func WasmDir() string

Types

type AppModule 

type AppModule struct {
	AppModuleBasic
	*base.BaseIBCUpgradeModule
	// contains filtered or unexported fields
}

AppModule implements an application module for the wasm module.

func NewAppModule 

func NewAppModule(cdc codec.CodecProxy, wasmkeeper *Keeper) AppModule

NewAppModule creates a new AppModule object

func (AppModule) BeginBlock 

func (am AppModule) BeginBlock(ctx sdk.Context, _ abci.RequestBeginBlock)

BeginBlock returns the begin blocker for the wasm module.

func (AppModule) CommitFilter 

func (am AppModule) CommitFilter() *store.StoreFilter

func (AppModule) ConsensusVersion 

func (AppModule) ConsensusVersion() uint64

ConsensusVersion is a sequence number for state-breaking change of the module. It should be incremented on each consensus-breaking change introduced by the module. To avoid wrong/empty versions, the initial version should be set to 1.

func (AppModule) EndBlock 

func (AppModule) EndBlock(_ sdk.Context, _ abci.RequestEndBlock) []abci.ValidatorUpdate

EndBlock returns the end blocker for the wasm module. It returns no validator updates.

func (AppModule) ExportGenesis 

func (am AppModule) ExportGenesis(ctx sdk.Context) json.RawMessage

func (AppModule) GenerateGenesisState 

func (AppModule) GenerateGenesisState(simState *module.SimulationState)

GenerateGenesisState creates a randomized GenState of the bank module.

func (AppModule) GetPermissionKeeper added in v1.6.6 

func (am AppModule) GetPermissionKeeper() types.ContractOpsKeeper

func (AppModule) InitGenesis 

func (am AppModule) InitGenesis(ctx sdk.Context, data json.RawMessage) []abci.ValidatorUpdate

InitGenesis performs genesis initialization for the wasm module. It returns no validator updates.

func (AppModule) NewHandler 

func (am AppModule) NewHandler() sdk.Handler

func (AppModule) NewQuerierHandler 

func (am AppModule) NewQuerierHandler() sdk.Querier

func (AppModule) ProposalContents 

func (AppModule) ProposalContents(simState module.SimulationState) []simtypes.WeightedProposalContent

ProposalContents doesn't return any content functions for governance proposals.

func (AppModule) PruneFilter 

func (am AppModule) PruneFilter() *store.StoreFilter

func (AppModule) QuerierRoute 

func (AppModule) QuerierRoute() string

QuerierRoute returns the wasm module's querier route name.

func (AppModule) RandomizedParams 

func (am AppModule) RandomizedParams(r *rand.Rand) []simtypes.ParamChange

RandomizedParams creates randomized bank param changes for the simulator.

func (AppModule) RegisterInvariants 

func (am AppModule) RegisterInvariants(ir sdk.InvariantRegistry)

RegisterInvariants registers the wasm module invariants.

func (AppModule) RegisterServices 

func (am AppModule) RegisterServices(cfg module.Configurator)

func (AppModule) RegisterStoreDecoder 

func (am AppModule) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry)

RegisterStoreDecoder registers a decoder for supply module's types

func (AppModule) RegisterTask 

func (am AppModule) RegisterTask() upgrade.HeightTask

func (AppModule) Route 

func (am AppModule) Route() string

Route returns the message routing key for the wasm module.

func (AppModule) UpgradeHeight 

func (am AppModule) UpgradeHeight() int64

func (AppModule) VersionFilter 

func (am AppModule) VersionFilter() *store.VersionFilter

func (AppModule) WeightedOperations 

func (am AppModule) WeightedOperations(simState module.SimulationState) []simtypes.WeightedOperation

WeightedOperations returns the all the gov module operations with their respective weights.

type AppModuleBasic 

type AppModuleBasic struct{}

AppModuleBasic defines the basic application module used by the wasm module.

func (AppModuleBasic) DefaultGenesis 

func (b AppModuleBasic) DefaultGenesis() json.RawMessage

func (AppModuleBasic) GetQueryCmd 

func (b AppModuleBasic) GetQueryCmd(cdc *codec.Codec) *cobra.Command

GetQueryCmd returns no root query command for the wasm module.

func (AppModuleBasic) GetQueryCmdV2 

func (b AppModuleBasic) GetQueryCmdV2(cdc *codec.CodecProxy, reg cdctypes.InterfaceRegistry) *cobra.Command

func (AppModuleBasic) GetTxCmd 

func (b AppModuleBasic) GetTxCmd(cdc *codec.Codec) *cobra.Command

GetTxCmd returns the root tx command for the wasm module.

func (AppModuleBasic) GetTxCmdV2 

func (b AppModuleBasic) GetTxCmdV2(cdc *codec.CodecProxy, reg cdctypes.InterfaceRegistry) *cobra.Command

func (AppModuleBasic) Name 

func (AppModuleBasic) Name() string

Name returns the wasm module's name.

func (AppModuleBasic) RegisterCodec 

func (b AppModuleBasic) RegisterCodec(amino *codec.Codec)

func (AppModuleBasic) RegisterGRPCGatewayRoutes 

func (b AppModuleBasic) RegisterGRPCGatewayRoutes(clientCtx clictx.CLIContext, serveMux *runtime.ServeMux)

func (AppModuleBasic) RegisterInterfaces 

func (b AppModuleBasic) RegisterInterfaces(registry cdctypes.InterfaceRegistry)

RegisterInterfaces implements InterfaceModule

func (AppModuleBasic) RegisterRESTRoutes 

func (AppModuleBasic) RegisterRESTRoutes(cliCtx clictx.CLIContext, rtr *mux.Router)

RegisterRESTRoutes registers the REST routes for the wasm module.

func (AppModuleBasic) RegisterRouterForGRPC 

func (b AppModuleBasic) RegisterRouterForGRPC(cliCtx clictx.CLIContext, r *mux.Router)

func (AppModuleBasic) ValidateGenesis 

func (b AppModuleBasic) ValidateGenesis(message json.RawMessage) error

type BankEncoder 

type BankEncoder = keeper.BankEncoder

type Code 

type Code = types.Code

type CodeInfo 

type CodeInfo = types.CodeInfo

type CodeInfoResponse 

type CodeInfoResponse = types.CodeInfoResponse

type Config 

type Config = types.WasmConfig

type Contract 

type Contract = types.Contract

type ContractConfirmStateAck 

type ContractConfirmStateAck []byte

func (ContractConfirmStateAck) Acknowledgement 

func (w ContractConfirmStateAck) Acknowledgement() []byte

func (ContractConfirmStateAck) Success 

func (w ContractConfirmStateAck) Success() bool

type ContractInfo 

type ContractInfo = types.ContractInfo

type ContractOpsKeeper added in v1.6.6 

type ContractOpsKeeper = types.ContractOpsKeeper

type CreatedAt 

type CreatedAt = types.AbsoluteTxPosition

type CustomEncoder 

type CustomEncoder = keeper.CustomEncoder

type CustomQuerier 

type CustomQuerier = keeper.CustomQuerier

type GenesisState 

type GenesisState = types.GenesisState

type IBCHandler 

type IBCHandler struct {
	// contains filtered or unexported fields
}

func NewIBCHandler 

func NewIBCHandler(k types.IBCContractKeeper, ck types.ChannelKeeper) IBCHandler

func (IBCHandler) NegotiateAppVersion 

func (i IBCHandler) NegotiateAppVersion(
	ctx sdk.Context,
	order channeltypes.Order,
	connectionID string,
	portID string,
	counterparty channeltypes.Counterparty,
	proposedVersion string,
) (version string, err error)

func (IBCHandler) OnAcknowledgementPacket 

func (i IBCHandler) OnAcknowledgementPacket(
	ctx sdk.Context,
	packet channeltypes.Packet,
	acknowledgement []byte,
	relayer sdk.AccAddress,
) error

OnAcknowledgementPacket implements the IBCModule interface

func (IBCHandler) OnChanCloseConfirm 

func (i IBCHandler) OnChanCloseConfirm(ctx sdk.Context, portID, channelID string) error

OnChanCloseConfirm implements the IBCModule interface

func (IBCHandler) OnChanCloseInit 

func (i IBCHandler) OnChanCloseInit(ctx sdk.Context, portID, channelID string) error

OnChanCloseInit implements the IBCModule interface

func (IBCHandler) OnChanOpenAck 

func (i IBCHandler) OnChanOpenAck(ctx sdk.Context, portID, channelID string, string, counterpartyVersion string) error

func (IBCHandler) OnChanOpenAckV3 

func (i IBCHandler) OnChanOpenAckV3(
	ctx sdk.Context,
	portID, channelID string,
	counterpartyChannelID string,
	counterpartyVersion string,
) error

OnChanOpenAck implements the IBCModule interface

func (IBCHandler) OnChanOpenConfirm 

func (i IBCHandler) OnChanOpenConfirm(ctx sdk.Context, portID, channelID string) error

OnChanOpenConfirm implements the IBCModule interface

func (IBCHandler) OnChanOpenInit 

func (i IBCHandler) OnChanOpenInit(
	ctx sdk.Context,
	order channeltypes.Order,
	connectionHops []string,
	portID string,
	channelID string,
	chanCap *capabilitytypes.Capability,
	counterParty channeltypes.Counterparty,
	version string,
) (string, error)

OnChanOpenInit implements the IBCModule interface

func (IBCHandler) OnChanOpenTry 

func (i IBCHandler) OnChanOpenTry(ctx sdk.Context, order channeltypes.Order, connectionHops []string, portID, channelID string, channelCap *capabilitytypes.Capability, counterparty channeltypes.Counterparty, version, counterpartyVersion string) (string, error)

func (IBCHandler) OnChanOpenTryV3 

func (i IBCHandler) OnChanOpenTryV3(
	ctx sdk.Context,
	order channeltypes.Order,
	connectionHops []string,
	portID, channelID string,
	chanCap *capabilitytypes.Capability,
	counterParty channeltypes.Counterparty,
	counterpartyVersion string,
) (string, error)

OnChanOpenTry implements the IBCModule interface

func (IBCHandler) OnRecvPacket 

func (i IBCHandler) OnRecvPacket(
	ctx sdk.Context,
	packet channeltypes.Packet,
	relayer sdk.AccAddress,
) ibcexported.Acknowledgement

OnRecvPacket implements the IBCModule interface

func (IBCHandler) OnTimeoutPacket 

func (i IBCHandler) OnTimeoutPacket(ctx sdk.Context, packet channeltypes.Packet, relayer sdk.AccAddress) error

OnTimeoutPacket implements the IBCModule interface

type Keeper 

type Keeper = keeper.Keeper

type MessageEncoders 

type MessageEncoders = keeper.MessageEncoders

type MessageHandler 

type MessageHandler = keeper.SDKMessageHandler

type Model 

type Model = types.Model

type MsgClearAdmin 

type MsgClearAdmin = types.MsgClearAdmin

type MsgClearAdminResponse 

type MsgClearAdminResponse = types.MsgClearAdminResponse

type MsgExecuteContract 

type MsgExecuteContract = types.MsgExecuteContract

type MsgExecuteContractResponse 

type MsgExecuteContractResponse = types.MsgExecuteContractResponse

type MsgInstantiateContract 

type MsgInstantiateContract = types.MsgInstantiateContract

type MsgInstantiateContractResponse 

type MsgInstantiateContractResponse = types.MsgInstantiateContractResponse

type MsgMigrateContract 

type MsgMigrateContract = types.MsgMigrateContract

type MsgMigrateContractResponse 

type MsgMigrateContractResponse = types.MsgMigrateContractResponse

type MsgServer 

type MsgServer = types.MsgServer

type MsgStoreCode 

type MsgStoreCode = types.MsgStoreCode

type MsgStoreCodeResponse 

type MsgStoreCodeResponse = types.MsgStoreCodeResponse

type MsgUpdateAdmin 

type MsgUpdateAdmin = types.MsgUpdateAdmin

type MsgUpdateAdminResponse 

type MsgUpdateAdminResponse = types.MsgUpdateAdminResponse

type MsgWasmIBCCall 

type MsgWasmIBCCall = types.MsgIBCSend

type Option 

type Option = keeper.Option

type ProposalType 

type ProposalType = types.ProposalType

type QueryHandler 

type QueryHandler = keeper.QueryHandler

type QueryPlugins 

type QueryPlugins = keeper.QueryPlugins

type Simulator added in v1.6.2 

type Simulator struct {
	// contains filtered or unexported fields
}

func (*Simulator) Context added in v1.6.2 

func (w *Simulator) Context() *sdk.Context

func (*Simulator) Release added in v1.7.0 

func (w *Simulator) Release()

func (*Simulator) Simulate added in v1.6.2 

func (w *Simulator) Simulate(msgs []sdk.Msg) (*sdk.Result, error)

type StakingEncoder 

type StakingEncoder = keeper.StakingEncoder

type WasmEncoder 

type WasmEncoder = keeper.WasmEncoder

Source Files

View all Source files

Directories

Path Synopsis
cli
rest
utils
wasmtesting
Package types is a reverse proxy.
 Package types is a reverse proxy.

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