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The Realm ABI Specification formally describes the protocol and encoding of interactions between realms and external clients, not necessarily written in Go. It can be seen as an extension of the [ABCI](https://github.com/tendermint/tendermint/tree/master/spec/abci) which covers the protocol between blockchain nodes and clients, but without details on their practical applications, such as realms. This PR addresses [#1842]. This is an initial draft commit, work in progress.
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| id: realm-abi | ||
| --- | ||
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| # GNO Realm ABI specification | ||
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| The GNO Realm Application Binary Interface (ABI) specifies the interface between realms (GNO smart contracts) and clients interacting with the realms. | ||
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| ## Overview and concepts | ||
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| Realms implement live programs on the blockchain, also called smart contracts. | ||
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| Each realm exists as a package, identified by its URL, and containing the realm source files. A realm has the following properties: | ||
| - Once deployed, the realm is autonomous and permanent: its code can not be modified, and it can not be stopped, but it may internally self-terminate (to be clarified). | ||
| - The realm state (i.e. the set of its global variables, public and private) is persistent (i.e. stored on the blockchain). | ||
| - The realm must execute in a deterministic way, so its execution on mutiple nodes always result in the same state and a consensus can be achieved. | ||
| - The realm exported types, functions and methods are usable by external clients in transactions. | ||
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| Realms are expressed in the Gno language, similar to Go, and represent the following kind of objects: | ||
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| - _Types_ which determine a set of values together with operations and methods specific to those values. | ||
| - _Values_ which are instances of types, used as variables, constants, function parameters or returned result. | ||
| - _Functions_ which implement logic to process parameters and return values of certain types. A function defined for a certain type is a _method_. | ||
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| To interact with a realm, the client connects to a node server (to be clarified), following the [ABCI] protocol. All the interactions between the realm and clients take place in ABCI transactions, called `Tx`. | ||
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| A client interaction with the realm may consist to: | ||
| - call a realm function with some parameters and getting results in response. The realm function may or not alter the realm state. The related ABCI methods are: [CheckTx] and [DeliverTx]. | ||
| - query the state of a realm, i.e. get the content of its exported objects by their name. Queries do not alter the realm state. The related ABCI method is [Query]. | ||
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| The ABCI protocol uses a [protobuf] encoding, with the `Tx` field containing the transaction content set as `bytes`. This document constitutes the extension to ABCI, describing `Tx`. | ||
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| ## Transaction generic data structures | ||
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| ### Coin | ||
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| | Name | Type | Description | Field Number | | ||
| |--------|--------|-------------|--------------| | ||
| | Denom | string | Coin name | 1 | | ||
| | Amount | int64 | amount | 2 | | ||
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| ### Fee | ||
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| | Name | Type | Description | Field Number | | ||
| |-----------|----------------|-----------------------------------|--------------| | ||
| | GasWanted | int64 | gas requested for the transaction | 1 | | ||
| | GasFee | [Coin](#coin) | gas payment fee | 2 | | ||
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| ### Signature | ||
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| | Name | Type | Description | Field Number | | ||
| |-----------|-------|-------------------|--------------| | ||
| | PubKey | bytes | signer public key | 1 | | ||
| | Signature | bytes | signature | 2 | | ||
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| ### Tx | ||
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| | Name | Type | Description | Field Number | | ||
| |------------|----------------------------------|-------------------------------------|--------------| | ||
| | Msgs | repeated string | [Message](#tx-messages) requests | 1 | | ||
| | Fee | [Fee](#fee) | fee | 2 | | ||
| | Signatures | repeated [Signature](#signature) | signatures | 3 | | ||
| | Memo | string | description | 4 | | ||
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| Usually, 2 fees are specified in `Tx`: | ||
| - the gas wanted: the gas requested for `Tx`, | ||
| - the gas fee: the gas payment fee. | ||
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| ## Tx messages | ||
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| `Tx` `Msgs` being protobuf strings, are encoded using a JSON representation. We describe here | ||
| only messages related to realms. | ||
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| ### MsgAddPkg | ||
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| Create and initialize a new package. | ||
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| In JSON, contains a first field `"@type": "/vm.m_addpkg"`. | ||
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| | Name | Type | Description | Field Number | | ||
| |---------|-------------------------|--------------------------------|--------------| | ||
| | Creator | string | creator address name or Bech32 | 1 | | ||
| | Package | [Package](#package) | package definition to load | 2 | | ||
| | Deposit | repeated [Coin](#coin) | deposit | 3 | | ||
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| ### MsgCall | ||
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| Execute a Gno statement. | ||
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| In JSON, contains a first field `"@type": "/vm.m_call"`. | ||
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| | Name | Type | Description | Field Number | | ||
| |---------|------------------------|--------------------------------------|--------------| | ||
| | Caller | string | caller address name or Bech32 | 1 | | ||
| | Send | repeated [Coin](#coin) | amount to pay | 2 | | ||
| | PkgPath | string | package path of the function to call | 3 | | ||
| | Func | string | function name | 4 | | ||
| | Args | repeated string | function arguments | 5 | | ||
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| ### MsgRun | ||
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| Load and execute a GNO program. The code resides in a `main` package with no exports (can not be called externally), it is only executed once. | ||
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| In JSON, contains a first field `"@type": "/vm.m_run"`. | ||
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| | Name | Type | Description | Field Number | | ||
| |---------|------------------------|---------------------------------------------------------|--------------| | ||
| | Caller | string | caller address name or Bech32 | 1 | | ||
| | Send | repeated [Coin](#coin) | amount to pay | 2 | | ||
| | Package | [Package](#package) | package definition to load. package name must be `main` | 3 | | ||
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| ### Package | ||
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| Definition of package content, as used in [MsgAddPkg](#msgaddpkg) and [MsgRun](#msgrun) | ||
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| | Name | Type | Descritption | Field Number | | ||
| |------|------------------------------|------------------------------------|--------------| | ||
| | Name | string | package name declared by `package` | 1 | | ||
| | Path | string | import path | 2 | | ||
| | Files| repeated [MemFile](#memfile) | gno source files | 3 | | ||
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| ### MemFile | ||
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| Definition of a gno package file, used in [Package](#package) | ||
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| | Name | Type | Descritption | Field Number | | ||
| |------|--------|----------------------------------|--------------| | ||
| | Name | string | base file name, ending in `.gno` | 1 | | ||
| | Body | string | file content (gno source) | 2 | | ||
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| ## Realm Types and Values Encoding | ||
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| Code reference: `gnovm/pkg/gnolang/gnolang.proto` | ||
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| ### TypedValue | ||
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| In JSON, contains a first field `"@type": "/gno.TypedValue"`. | ||
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| | Name | Type | Description | Field Number | | ||
| |------|-------|-----------------------------------|--------------| | ||
| | T | Any | type | 1 | | ||
| | V | Any | value | 2 | | ||
| | N | Bytes | numeric bytes (for integers only) | 3 | | ||
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| ### PointerValue | ||
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| In JSON, contains a first field `"@type": "/gno.PointerValue"`. | ||
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| | Name | Type | Description | Field Number | | ||
| |-------|---------------------------|--------------------------------|--------------| | ||
| | TV | [TypedValue](#typedvalue) | typed value | 1 | | ||
| | Base | Any | Array or Struct base value | 2 | | ||
| | Index | int64 | List or fields or values index | 3 | | ||
| | Key | [TypedValue](#typedvalue) | for maps (optional in JSON) | 4 | | ||
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| ### ArrayValue | ||
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| In JSON, contains a first field `"@type": "/gno.ArrayValue"`. | ||
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| | Name | Type | Description | Field Number | | ||
| |------------|------------------------------------|-------------------|--------------| | ||
| | ObjectInfo | [ObjectInfo](#objectinfo) | object info | 1 | | ||
| | List | repeated [TypedValue](#typedvalue) | elements of array | 2 | | ||
| | Data | bytes | internal data | 3 | | ||
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| ### SliceValue | ||
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| In JSON, contains a first field `"@type": "/gno.SliceValue"`. | ||
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| | Name | Type | Description | Field Number | | ||
| |--------|-------|----------------------------|--------------| | ||
| | Base | Any | Array or Struct base value | 1 | | ||
| | Offset | int64 | offset | 2 | | ||
| | Length | int64 | length | 3 | | ||
| | MaxCap | int64 | maximum capacity | 4 | | ||
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| ### StructValue | ||
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| ### FuncValue | ||
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| ### MapValue | ||
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| ### MapList | ||
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| ### MapListItem | ||
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| ### TypeValue | ||
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| ### TypeType | ||
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| ### RefType | ||
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| ### StructType | ||
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| ### DeclaredType | ||
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| ### InterfaceType | ||
| ` | ||
| [ABCI]: https://github.com/tendermint/tendermint/tree/master/spec/abci | ||
| [CheckTx]: https://github.com/tendermint/spec/blob/master/spec/abci/abci.md#checktx-1 | ||
| [DeliverTx]: https://github.com/tendermint/spec/blob/master/spec/abci/abci.md#delivertx-1 | ||
| [Query]: https://github.com/tendermint/spec/blob/master/spec/abci/abci.md#query-1 | ||
| [protobuf]: https://protobuf.dev |