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message.ts
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message.ts
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import bs58 from 'bs58';
import {Buffer} from 'buffer';
import * as BufferLayout from '@solana/buffer-layout';
import {PublicKey} from './publickey';
import type {Blockhash} from './blockhash';
import * as Layout from './layout';
import {PACKET_DATA_SIZE} from './transaction';
import * as shortvec from './util/shortvec-encoding';
import {toBuffer} from './util/to-buffer';
/**
* The message header, identifying signed and read-only account
*/
export type MessageHeader = {
/**
* The number of signatures required for this message to be considered valid. The
* signatures must match the first `numRequiredSignatures` of `accountKeys`.
*/
numRequiredSignatures: number;
/** The last `numReadonlySignedAccounts` of the signed keys are read-only accounts */
numReadonlySignedAccounts: number;
/** The last `numReadonlySignedAccounts` of the unsigned keys are read-only accounts */
numReadonlyUnsignedAccounts: number;
};
/**
* An instruction to execute by a program
*
* @property {number} programIdIndex
* @property {number[]} accounts
* @property {string} data
*/
export type CompiledInstruction = {
/** Index into the transaction keys array indicating the program account that executes this instruction */
programIdIndex: number;
/** Ordered indices into the transaction keys array indicating which accounts to pass to the program */
accounts: number[];
/** The program input data encoded as base 58 */
data: string;
};
/**
* Message constructor arguments
*/
export type MessageArgs = {
/** The message header, identifying signed and read-only `accountKeys` */
header: MessageHeader;
/** All the account keys used by this transaction */
accountKeys: string[];
/** The hash of a recent ledger block */
recentBlockhash: Blockhash;
/** Instructions that will be executed in sequence and committed in one atomic transaction if all succeed. */
instructions: CompiledInstruction[];
};
const PUBKEY_LENGTH = 32;
/**
* List of instructions to be processed atomically
*/
export class Message {
header: MessageHeader;
accountKeys: PublicKey[];
recentBlockhash: Blockhash;
instructions: CompiledInstruction[];
private indexToProgramIds: Map<number, PublicKey> = new Map<
number,
PublicKey
>();
constructor(args: MessageArgs) {
this.header = args.header;
this.accountKeys = args.accountKeys.map(account => new PublicKey(account));
this.recentBlockhash = args.recentBlockhash;
this.instructions = args.instructions;
this.instructions.forEach(ix =>
this.indexToProgramIds.set(
ix.programIdIndex,
this.accountKeys[ix.programIdIndex],
),
);
}
isAccountSigner(index: number): boolean {
return index < this.header.numRequiredSignatures;
}
isAccountWritable(index: number): boolean {
return (
index <
this.header.numRequiredSignatures -
this.header.numReadonlySignedAccounts ||
(index >= this.header.numRequiredSignatures &&
index <
this.accountKeys.length - this.header.numReadonlyUnsignedAccounts)
);
}
isProgramId(index: number): boolean {
return this.indexToProgramIds.has(index);
}
programIds(): PublicKey[] {
return [...this.indexToProgramIds.values()];
}
nonProgramIds(): PublicKey[] {
return this.accountKeys.filter((_, index) => !this.isProgramId(index));
}
serialize(): Buffer {
const numKeys = this.accountKeys.length;
let keyCount: number[] = [];
shortvec.encodeLength(keyCount, numKeys);
const instructions = this.instructions.map(instruction => {
const {accounts, programIdIndex} = instruction;
const data = bs58.decode(instruction.data);
let keyIndicesCount: number[] = [];
shortvec.encodeLength(keyIndicesCount, accounts.length);
let dataCount: number[] = [];
shortvec.encodeLength(dataCount, data.length);
return {
programIdIndex,
keyIndicesCount: Buffer.from(keyIndicesCount),
keyIndices: Buffer.from(accounts),
dataLength: Buffer.from(dataCount),
data,
};
});
let instructionCount: number[] = [];
shortvec.encodeLength(instructionCount, instructions.length);
let instructionBuffer = Buffer.alloc(PACKET_DATA_SIZE);
Buffer.from(instructionCount).copy(instructionBuffer);
let instructionBufferLength = instructionCount.length;
instructions.forEach(instruction => {
const instructionLayout = BufferLayout.struct([
BufferLayout.u8('programIdIndex'),
BufferLayout.blob(
instruction.keyIndicesCount.length,
'keyIndicesCount',
),
BufferLayout.seq(
BufferLayout.u8('keyIndex'),
instruction.keyIndices.length,
'keyIndices',
),
BufferLayout.blob(instruction.dataLength.length, 'dataLength'),
BufferLayout.seq(
BufferLayout.u8('userdatum'),
instruction.data.length,
'data',
),
]);
const length = instructionLayout.encode(
instruction,
instructionBuffer,
instructionBufferLength,
);
instructionBufferLength += length;
});
instructionBuffer = instructionBuffer.slice(0, instructionBufferLength);
const signDataLayout = BufferLayout.struct([
BufferLayout.blob(1, 'numRequiredSignatures'),
BufferLayout.blob(1, 'numReadonlySignedAccounts'),
BufferLayout.blob(1, 'numReadonlyUnsignedAccounts'),
BufferLayout.blob(keyCount.length, 'keyCount'),
BufferLayout.seq(Layout.publicKey('key'), numKeys, 'keys'),
Layout.publicKey('recentBlockhash'),
]);
const transaction = {
numRequiredSignatures: Buffer.from([this.header.numRequiredSignatures]),
numReadonlySignedAccounts: Buffer.from([
this.header.numReadonlySignedAccounts,
]),
numReadonlyUnsignedAccounts: Buffer.from([
this.header.numReadonlyUnsignedAccounts,
]),
keyCount: Buffer.from(keyCount),
keys: this.accountKeys.map(key => toBuffer(key.toBytes())),
recentBlockhash: bs58.decode(this.recentBlockhash),
};
let signData = Buffer.alloc(2048);
const length = signDataLayout.encode(transaction, signData);
instructionBuffer.copy(signData, length);
return signData.slice(0, length + instructionBuffer.length);
}
/**
* Decode a compiled message into a Message object.
*/
static from(buffer: Buffer | Uint8Array | Array<number>): Message {
// Slice up wire data
let byteArray = [...buffer];
const numRequiredSignatures = byteArray.shift() as number;
const numReadonlySignedAccounts = byteArray.shift() as number;
const numReadonlyUnsignedAccounts = byteArray.shift() as number;
const accountCount = shortvec.decodeLength(byteArray);
let accountKeys = [];
for (let i = 0; i < accountCount; i++) {
const account = byteArray.slice(0, PUBKEY_LENGTH);
byteArray = byteArray.slice(PUBKEY_LENGTH);
accountKeys.push(bs58.encode(Buffer.from(account)));
}
const recentBlockhash = byteArray.slice(0, PUBKEY_LENGTH);
byteArray = byteArray.slice(PUBKEY_LENGTH);
const instructionCount = shortvec.decodeLength(byteArray);
let instructions: CompiledInstruction[] = [];
for (let i = 0; i < instructionCount; i++) {
const programIdIndex = byteArray.shift() as number;
const accountCount = shortvec.decodeLength(byteArray);
const accounts = byteArray.slice(0, accountCount);
byteArray = byteArray.slice(accountCount);
const dataLength = shortvec.decodeLength(byteArray);
const dataSlice = byteArray.slice(0, dataLength);
const data = bs58.encode(Buffer.from(dataSlice));
byteArray = byteArray.slice(dataLength);
instructions.push({
programIdIndex,
accounts,
data,
});
}
const messageArgs = {
header: {
numRequiredSignatures,
numReadonlySignedAccounts,
numReadonlyUnsignedAccounts,
},
recentBlockhash: bs58.encode(Buffer.from(recentBlockhash)),
accountKeys,
instructions,
};
return new Message(messageArgs);
}
}