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* Antelope/EOSIO ABI Encoder
*/
import {ABI, ABIDef, Bytes, Variant} from '../chain'
import {isInstanceOf} from '../utils'
import {
ABISerializable,
ABISerializableConstructor,
ABISerializableObject,
ABISerializableType,
abiTypeString,
isTypeDescriptor,
synthesizeABI,
} from './serializable'
import {buildTypeLookup, getType, getTypeName} from './builtins'
class EncodingError extends Error {
static __className = 'EncodingError'
ctx: EncodingContext
underlyingError: Error
constructor(ctx: EncodingContext, underlyingError: Error) {
const path = ctx.codingPath
.map(({field, type}) => {
Iif (typeof field === 'number') {
return field
} else {
return `${field}<${type.typeName}>`
}
})
.join('.')
super(`Encoding error at ${path}: ${underlyingError.message}`)
this.stack = underlyingError.stack
this.ctx = ctx
this.underlyingError = underlyingError
}
}
interface EncodeArgsBase {
/**
* ABI definition to use when encoding.
*/
abi?: ABIDef
/**
* Additional types to use when encoding, can be used to pass type constructors
* that should be used when encountering a custom type.
*/
customTypes?: ABISerializableConstructor[]
/**
* Can be passed to use a custom ABIEncoder instance.
*/
encoder?: ABIEncoder
/**
* Optional metadata to pass to the encoder.
*/
metadata?: Record<string, any>
}
interface EncodeArgsUntyped extends EncodeArgsBase {
/**
* Object to encode, either a object conforming to `ABISerializable`
* or a JavaScript object, when the latter is used an the `type`
* argument must also be set.
*/
object: any
/**
* Type to use when encoding the given object, either a type constructor
* or a string name of a builtin type or a custom type in the given `abi`.
*/
type: ABISerializableType
}
interface EncodeArgsSerializable extends EncodeArgsBase {
/**
* Object conforming to `ABISerializable` to be encoded.
*/
object: ABISerializable
/**
* Optional type-override for given serializable object.
*/
type?: ABISerializableType
}
export type EncodeArgs = EncodeArgsSerializable | EncodeArgsUntyped
export function abiEncode(args: EncodeArgs): Bytes {
let type: ABISerializableConstructor | undefined
let typeName: string | undefined
if (typeof args.type === 'string') {
typeName = args.type
} else if (args.type && isTypeDescriptor(args.type)) {
if (typeof args.type.type !== 'string') {
type = args.type.type
}
typeName = abiTypeString(args.type)
} else if (args.type && args.type.abiName !== undefined) {
type = args.type
typeName = args.type.abiName
} else {
type = getType(args.object)
if (type) {
typeName = type.abiName
if (Array.isArray(args.object)) {
typeName += '[]'
}
}
}
const customTypes = args.customTypes ? args.customTypes.slice() : []
if (type) {
customTypes.unshift(type)
} else if (typeName) {
const rootName = new ABI.ResolvedType(typeName).name
type = customTypes.find((t) => t.abiName === rootName)
}
let rootType: ABI.ResolvedType
if (args.abi && typeName) {
rootType = ABI.from(args.abi).resolveType(typeName)
} else if (type) {
const synthesized = synthesizeABI(type)
rootType = synthesized.abi.resolveType(typeName || type.abiName)
customTypes.push(...synthesized.types)
} else if (typeName) {
rootType = new ABI.ResolvedType(typeName)
} else {
throw new Error(
'Unable to determine the type of the object to be encoded. ' +
'To encode custom ABI types you must pass the type argument.'
)
}
const types = buildTypeLookup(customTypes)
const encoder = args.encoder || new ABIEncoder()
if (args.metadata) {
encoder.metadata = args.metadata
}
const ctx: EncodingContext = {
types,
encoder,
codingPath: [{field: 'root', type: rootType}],
}
try {
encodeAny(args.object, rootType, ctx)
} catch (error) {
throw new EncodingError(ctx, error)
}
return Bytes.from(encoder.getData())
}
export function encodeAny(value: any, type: ABI.ResolvedType, ctx: EncodingContext) {
const valueExists = value !== undefined && value !== null
if (type.isOptional) {
ctx.encoder.writeByte(valueExists ? 1 : 0)
if (!valueExists) {
return
}
}
if (type.isArray) {
if (!Array.isArray(value)) {
throw new Error(`Expected array for: ${type.typeName}`)
}
const len = value.length
if (!type.size) {
ctx.encoder.writeVaruint32(len)
}
for (let i = 0; i < len; i++) {
ctx.codingPath.push({field: i, type})
encodeInner(value[i])
ctx.codingPath.pop()
}
} else {
encodeInner(value)
}
function encodeInner(value: any) {
const abiType = ctx.types[type.name]
if (type.ref && !abiType) {
// type is alias, follow it
encodeAny(value, type.ref, ctx)
return
}
if (!valueExists) {
if (type.isExtension) {
return
}
throw new Error(
`Found ${value} for non-optional type: ${type.typeName} (${ctx.codingPath
.map((path) => path.field)
.join('.')})`
)
}
if (abiType && abiType.toABI) {
// type explicitly handles encoding
abiType.toABI(value, ctx.encoder)
} else if (typeof value.toABI === 'function' && value.constructor.abiName === type.name) {
// instance handles encoding
value.toABI(ctx.encoder)
} else {
// encode according to abi def if possible
if (type.fields) {
Iif (typeof value !== 'object') {
throw new Error(`Expected object for: ${type.name}`)
}
const fields = type.allFields
Iif (!fields) {
throw new Error('Invalid struct fields')
}
for (const field of fields) {
ctx.codingPath.push({field: field.name, type: field.type})
encodeAny(value[field.name], field.type, ctx)
ctx.codingPath.pop()
}
} else if (type.variant) {
let vName: string | undefined
if (Array.isArray(value) && value.length === 2 && typeof value[0] === 'string') {
vName = value[0]
value = value[1]
} else if (isInstanceOf(value, Variant)) {
vName = value.variantName
value = value.value
} else {
vName = getTypeName(value)
}
const vIdx = type.variant.findIndex((t) => t.typeName === vName)
if (vIdx === -1) {
const types = type.variant.map((t) => `'${t.typeName}'`).join(', ')
throw new Error(`Unknown variant type '${vName}', expected one of ${types}`)
}
const vType = type.variant[vIdx]
ctx.encoder.writeVaruint32(vIdx)
ctx.codingPath.push({field: `v${vIdx}`, type: vType})
encodeAny(value, vType, ctx)
ctx.codingPath.pop()
} else {
if (!abiType) {
throw new Error(
type.name === 'any' ? 'Unable to encode any type to binary' : 'Unknown type'
)
}
const instance = abiType.from(value) as ABISerializableObject
Iif (!instance.toABI) {
throw new Error(`Invalid type ${type.name}, no encoding methods implemented`)
}
instance.toABI(ctx.encoder)
}
}
}
}
interface EncodingContext {
encoder: ABIEncoder
types: ReturnType<typeof buildTypeLookup>
codingPath: {field: string | number; type: ABI.ResolvedType}[]
}
export class ABIEncoder {
static __className = 'ABIEncoder'
private pos = 0
private data: DataView
private array: Uint8Array
private textEncoder = new TextEncoder()
/** User declared metadata, can be used to pass info to instances when encoding. */
metadata: Record<string, any> = {}
constructor(private pageSize = 1024) {
const buffer = new ArrayBuffer(pageSize)
this.data = new DataView(buffer)
this.array = new Uint8Array(buffer)
}
private ensure(bytes: number) {
if (this.data.byteLength >= this.pos + bytes) {
return
}
const pages = Math.ceil(bytes / this.pageSize)
const newSize = this.data.byteLength + this.pageSize * pages
const buffer = new ArrayBuffer(newSize)
const data = new DataView(buffer)
const array = new Uint8Array(buffer)
array.set(this.array)
this.data = data
this.array = array
}
/** Write a single byte. */
writeByte(byte: number) {
this.ensure(1)
this.array[this.pos++] = byte
}
/** Write an array of bytes. */
writeArray(bytes: ArrayLike<number>) {
const size = bytes.length
this.ensure(size)
this.array.set(bytes, this.pos)
this.pos += size
}
writeFloat(value: number, byteWidth: number) {
this.ensure(byteWidth)
switch (byteWidth) {
case 4:
this.data.setFloat32(this.pos, value, true)
break
case 8:
this.data.setFloat64(this.pos, value, true)
break
default:
throw new Error('Invalid float size')
}
this.pos += byteWidth
}
writeVaruint32(v: number) {
this.ensure(4)
for (;;) {
if (v >>> 7) {
this.array[this.pos++] = 0x80 | (v & 0x7f)
v = v >>> 7
} else {
this.array[this.pos++] = v
break
}
}
}
writeVarint32(v: number) {
this.writeVaruint32((v << 1) ^ (v >> 31))
}
writeString(v: string) {
const data = this.textEncoder.encode(v)
this.writeVaruint32(data.byteLength)
this.writeArray(data)
}
getData(): Uint8Array {
return new Uint8Array(this.array.buffer, this.array.byteOffset, this.pos)
}
getBytes(): Bytes {
return new Bytes(this.getData())
}
}
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