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import type {ABISerializableObject} from '../serializer/serializable'
import {abiDecode, ABIDecoder} from '../serializer/decoder'
import {abiEncode, ABIEncoder} from '../serializer/encoder'
import {Blob, Name, NameType} from '../'
export type ABIDef = string | Partial<ABI.Def> | ABI | Blob
export class ABI implements ABISerializableObject {
static abiName = 'abi'
static version = 'eosio::abi/1.1'
version: string
/// List of type aliases.
types: ABI.TypeDef[]
/// List of variant types.
variants: ABI.Variant[]
/// List of struct types.
structs: ABI.Struct[]
/// List of contract actions.
actions: ABI.Action[]
/// List of contract tables.
tables: ABI.Table[]
/// Ricardian contracts.
ricardian_clauses: ABI.Clause[]
constructor(args: Partial<ABI.Def>) {
this.version = args.version || ABI.version
this.types = args.types || []
this.variants = args.variants || []
this.structs = args.structs || []
this.actions = args.actions || []
this.tables = args.tables || []
this.ricardian_clauses = args.ricardian_clauses || []
}
static from(value: ABIDef) {
if (isInstanceOf(value, ABI)) {
return value
}
if (isInstanceOf(value, Blob)) {
return abiDecode({
data: value.array,
type: this,
})
}
Iif (typeof value === 'string') {
return new ABI(JSON.parse(value))
}
return new ABI(value)
}
static fromABI(decoder: ABIDecoder) {
const version = decoder.readString()
const types: ABI.TypeDef[] = []
const numTypes = decoder.readVaruint32()
for (let i = 0; i < numTypes; i++) {
types.push({new_type_name: decoder.readString(), type: decoder.readString()})
}
const structs: ABI.Struct[] = []
const numStructs = decoder.readVaruint32()
for (let i = 0; i < numStructs; i++) {
const name = decoder.readString()
const base = decoder.readString()
const numFields = decoder.readVaruint32()
const fields: ABI.Field[] = []
for (let j = 0; j < numFields; j++) {
fields.push({name: decoder.readString(), type: decoder.readString()})
}
structs.push({base, name, fields})
}
const actions: ABI.Action[] = []
const numActions = decoder.readVaruint32()
for (let i = 0; i < numActions; i++) {
const name = Name.fromABI(decoder)
const type = decoder.readString()
const ricardian_contract = decoder.readString()
actions.push({name, type, ricardian_contract})
}
const tables: ABI.Table[] = []
const numTables = decoder.readVaruint32()
for (let i = 0; i < numTables; i++) {
const name = Name.fromABI(decoder)
const index_type = decoder.readString()
const key_names: string[] = []
const numKeyNames = decoder.readVaruint32()
for (let j = 0; j < numKeyNames; j++) {
key_names.push(decoder.readString())
}
const key_types: string[] = []
const numKeyTypes = decoder.readVaruint32()
for (let j = 0; j < numKeyTypes; j++) {
key_types.push(decoder.readString())
}
const type = decoder.readString()
tables.push({name, index_type, key_names, key_types, type})
}
const ricardian_clauses: ABI.Clause[] = []
const numClauses = decoder.readVaruint32()
for (let i = 0; i < numClauses; i++) {
const id = decoder.readString()
const body = decoder.readString()
ricardian_clauses.push({id, body})
}
// error_messages, never used?
const numErrors = decoder.readVaruint32()
for (let i = 0; i < numErrors; i++) {
decoder.advance(8) // uint64 error_code
decoder.advance(decoder.readVaruint32()) // string error_msgr
}
// extensions, not used
const numExtensions = decoder.readVaruint32()
for (let i = 0; i < numExtensions; i++) {
decoder.advance(2) // uint16 type
decoder.advance(decoder.readVaruint32()) // bytes data
}
// variants is a binary extension for some reason even though extensions are defined on the type
const variants: ABI.Variant[] = []
Eif (decoder.canRead()) {
const numVariants = decoder.readVaruint32()
for (let i = 0; i < numVariants; i++) {
const name = decoder.readString()
const types: string[] = []
const numTypes = decoder.readVaruint32()
for (let j = 0; j < numTypes; j++) {
types.push(decoder.readString())
}
variants.push({name, types})
}
}
return new ABI({
version,
types,
structs,
actions,
tables,
ricardian_clauses,
variants,
})
}
toABI(encoder: ABIEncoder) {
encoder.writeString(this.version)
encoder.writeVaruint32(this.types.length)
for (const type of this.types) {
encoder.writeString(type.new_type_name)
encoder.writeString(type.type)
}
encoder.writeVaruint32(this.structs.length)
for (const struct of this.structs) {
encoder.writeString(struct.name)
encoder.writeString(struct.base)
encoder.writeVaruint32(struct.fields.length)
for (const field of struct.fields) {
encoder.writeString(field.name)
encoder.writeString(field.type)
}
}
encoder.writeVaruint32(this.actions.length)
for (const action of this.actions) {
Name.from(action.name).toABI(encoder)
encoder.writeString(action.type)
encoder.writeString(action.ricardian_contract)
}
encoder.writeVaruint32(this.tables.length)
for (const table of this.tables) {
Name.from(table.name).toABI(encoder)
encoder.writeString(table.index_type)
encoder.writeVaruint32(table.key_names.length)
for (const key of table.key_names) {
encoder.writeString(key)
}
encoder.writeVaruint32(table.key_types.length)
for (const key of table.key_types) {
encoder.writeString(key)
}
encoder.writeString(table.type)
}
encoder.writeVaruint32(this.ricardian_clauses.length)
for (const clause of this.ricardian_clauses) {
encoder.writeString(clause.id)
encoder.writeString(clause.body)
}
encoder.writeVaruint32(0) // error_messages
encoder.writeVaruint32(0) // extensions
encoder.writeVaruint32(this.variants.length)
for (const variant of this.variants) {
encoder.writeString(variant.name)
encoder.writeVaruint32(variant.types.length)
for (const type of variant.types) {
encoder.writeString(type)
}
}
}
resolveType(name: string): ABI.ResolvedType {
const types: {[name: string]: ABI.ResolvedType} = {}
return this.resolve({name, types}, {id: 0})
}
resolveAll() {
const types: {[name: string]: ABI.ResolvedType} = {}
const ctx: {id: number} = {id: 0}
return {
types: this.types.map((t) => this.resolve({name: t.new_type_name, types}, ctx)),
variants: this.variants.map((t) => this.resolve({name: t.name, types}, ctx)),
structs: this.structs.map((t) => this.resolve({name: t.name, types}, ctx)),
}
}
private resolve(
{name, types}: {name: string; types: {[name: string]: ABI.ResolvedType}},
ctx: {id: number}
): ABI.ResolvedType {
const existing = types[name]
if (existing) {
return existing
}
const type = new ABI.ResolvedType(name, ++ctx.id)
types[type.typeName] = type
const alias = this.types.find((typeDef) => typeDef.new_type_name == type.name)
if (alias) {
type.ref = this.resolve({name: alias.type, types}, ctx)
return type
}
const struct = this.getStruct(type.name)
if (struct) {
if (struct.base) {
type.base = this.resolve({name: struct.base, types}, ctx)
}
type.fields = struct.fields.map((field) => {
return {
name: field.name,
type: this.resolve({name: field.type, types}, ctx),
}
})
return type
}
const variant = this.getVariant(type.name)
if (variant) {
type.variant = variant.types.map((name) => this.resolve({name, types}, ctx))
return type
}
// builtin or unknown type
return type
}
getStruct(name: string): ABI.Struct | undefined {
return this.structs.find((struct) => struct.name == name)
}
getVariant(name: string): ABI.Variant | undefined {
return this.variants.find((variant) => variant.name == name)
}
/** Return arguments type of an action in this ABI. */
getActionType(actionName: NameType): string | undefined {
const name = Name.from(actionName).toString()
const action = this.actions.find((a) => a.name.toString() === name)
Eif (action) {
return action.type
}
}
equals(other: ABIDef): boolean {
const o = ABI.from(other)
Iif (
this.version != o.version ||
this.types.length != o.types.length ||
this.structs.length != o.structs.length ||
this.actions.length != o.actions.length ||
this.tables.length != o.tables.length ||
this.ricardian_clauses.length != o.ricardian_clauses.length ||
this.variants.length != o.variants.length
) {
return false
}
return abiEncode({object: this}).equals(abiEncode({object: o}))
}
toJSON() {
return {
version: this.version,
types: this.types,
structs: this.structs,
actions: this.actions,
tables: this.tables,
ricardian_clauses: this.ricardian_clauses,
error_messages: [],
abi_extensions: [],
variants: this.variants,
}
}
}
export namespace ABI {
export interface TypeDef {
new_type_name: string
type: string
}
export interface Field {
name: string
type: string
}
export interface Struct {
name: string
base: string
fields: Field[]
}
export interface Action {
name: NameType
type: string
ricardian_contract: string
}
export interface Table {
name: NameType
index_type: string
key_names: string[]
key_types: string[]
type: string
}
export interface Clause {
id: string
body: string
}
export interface Variant {
name: string
types: string[]
}
export interface Def {
version: string
types: TypeDef[]
variants: Variant[]
structs: Struct[]
actions: Action[]
tables: Table[]
ricardian_clauses: Clause[]
}
export class ResolvedType {
name: string
id: number
isArray: boolean
isOptional: boolean
isExtension: boolean
base?: ResolvedType
fields?: {name: string; type: ResolvedType}[]
variant?: ResolvedType[]
ref?: ResolvedType
constructor(fullName: string, id = 0) {
let name = fullName
if (name.endsWith('$')) {
name = name.slice(0, -1)
this.isExtension = true
} else {
this.isExtension = false
}
if (name.endsWith('?')) {
name = name.slice(0, -1)
this.isOptional = true
} else {
this.isOptional = false
}
if (name.endsWith('[]')) {
name = name.slice(0, -2)
this.isArray = true
} else {
this.isArray = false
}
this.id = id
this.name = name
}
/**
* Type name including suffixes: [] array, ? optional, $ binary ext
*/
get typeName(): string {
let rv = this.name
if (this.isArray) {
rv += '[]'
}
if (this.isOptional) {
rv += '?'
}
if (this.isExtension) {
rv += '$'
}
return rv
}
/** All fields including base struct(s), undefined if not a struct type. */
get allFields() {
// eslint-disable-next-line @typescript-eslint/no-this-alias
let current: ResolvedType | undefined = this
const rv: {name: string; type: ResolvedType}[] = []
const seen = new Set<string>()
do {
if (!current.fields) {
return // invalid struct
}
Iif (seen.has(current.name)) {
return // circular ref
}
for (let i = current.fields.length - 1; i >= 0; i--) {
rv.unshift(current.fields[i])
}
seen.add(current.name)
current = current.base
} while (current !== undefined)
return rv
}
}
}
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