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import {Reader} from '@jsonjoy.com/buffers/lib/Reader';
import {RpcMsgType, RpcReplyStat, RPC_VERSION} from './constants';
import {RpcEncodingError} from './errors';
import {
type RpcOpaqueAuth,
RpcCallMessage,
RpcAcceptedReplyMessage,
RpcRejectedReplyMessage,
type RpcMessage,
} from './messages';
import type {IWriter, IWriterGrowable} from '@jsonjoy.com/buffers';
export class RpcMessageEncoder<W extends IWriter & IWriterGrowable = IWriter & IWriterGrowable> {
constructor(public readonly writer: W = new Writer() as any) {}
public encodeCall(
xid: number,
prog: number,
vers: number,
proc: number,
cred: RpcOpaqueAuth,
verf: RpcOpaqueAuth,
params?: Reader | Uint8Array,
): Uint8Array {
this.writeCall(xid, prog, vers, proc, cred, verf, params);
return this.writer.flush();
}
public encodeAcceptedReply(
xid: number,
verf: RpcOpaqueAuth,
acceptStat: number,
mismatchInfo?: {low: number; high: number},
results?: Reader | Uint8Array,
): Uint8Array {
this.writeAcceptedReply(xid, verf, acceptStat, mismatchInfo, results);
return this.writer.flush();
}
public encodeRejectedReply(
xid: number,
rejectStat: number,
mismatchInfo?: {low: number; high: number},
authStat?: number,
): Uint8Array {
this.writeRejectedReply(xid, rejectStat, mismatchInfo, authStat);
return this.writer.flush();
}
public encodeMessage(msg: RpcMessage): Uint8Array {
this.writeMessage(msg);
return this.writer.flush();
}
public writeMessage(msg: RpcMessage): void {
if (msg instanceof RpcCallMessage) {
this.writeCall(msg.xid, msg.prog, msg.vers, msg.proc, msg.cred, msg.verf, msg.params);
} else if (msg instanceof RpcAcceptedReplyMessage) {
this.writeAcceptedReply(msg.xid, msg.verf, msg.stat, msg.mismatchInfo, msg.results);
} else if (msg instanceof RpcRejectedReplyMessage) {
this.writeRejectedReply(msg.xid, msg.stat, msg.mismatchInfo, msg.authStat);
}
}
public writeCall(
xid: number,
prog: number,
vers: number,
proc: number,
cred: RpcOpaqueAuth,
verf: RpcOpaqueAuth,
params?: Reader | Uint8Array,
): void {
const writer = this.writer;
writer.ensureCapacity(16 * 4);
const view = writer.view;
let x = writer.x;
view.setUint32(x, xid, false);
x += 4;
view.setUint32(x, RpcMsgType.CALL, false);
x += 4;
view.setUint32(x, RPC_VERSION, false);
x += 4;
view.setUint32(x, prog, false);
x += 4;
view.setUint32(x, vers, false);
x += 4;
view.setUint32(x, proc, false);
x += 4;
writer.x = x;
this.writeOpaqueAuth(cred);
this.writeOpaqueAuth(verf);
if (params instanceof Uint8Array) {
if (params.length > 0) writer.buf(params, params.length);
} else if (params instanceof Reader) {
const size = params.size();
if (size > 0) writer.buf(params.subarray(0, size), size);
}
}
public writeAcceptedReply(
xid: number,
verf: RpcOpaqueAuth,
acceptStat: number,
mismatchInfo?: {low: number; high: number},
results?: Reader | Uint8Array,
): void {
const writer = this.writer;
writer.ensureCapacity(16 * 4);
const view = writer.view;
let x = writer.x;
view.setUint32(x, xid, false);
x += 4;
view.setUint32(x, RpcMsgType.REPLY, false);
x += 4;
view.setUint32(x, RpcReplyStat.MSG_ACCEPTED, false);
x += 4;
writer.x = x;
this.writeOpaqueAuth(verf);
writer.u32(acceptStat);
if (mismatchInfo) {
writer.u32(mismatchInfo.low);
writer.u32(mismatchInfo.high);
}
if (results) {
if (results instanceof Uint8Array) {
if (results.length > 0) writer.buf(results, results.length);
} else {
const size = results.size();
if (size > 0) writer.buf(results.uint8, size);
}
}
}
public writeRejectedReply(
xid: number,
rejectStat: number,
mismatchInfo?: {low: number; high: number},
authStat?: number,
): void {
const writer = this.writer;
writer.ensureCapacity(7 * 4);
const view = writer.view;
let x = writer.x;
view.setUint32(x, xid, false);
x += 4;
view.setUint32(x, RpcMsgType.REPLY, false);
x += 4;
view.setUint32(x, RpcReplyStat.MSG_DENIED, false);
x += 4;
view.setUint32(x, rejectStat, false);
x += 4;
if (mismatchInfo) {
view.setUint32(x, mismatchInfo.low, false);
x += 4;
view.setUint32(x, mismatchInfo.high, false);
x += 4;
}
if (authStat !== undefined) {
view.setUint32(x, authStat, false);
x += 4;
}
writer.x = x;
}
private writeOpaqueAuth(auth: RpcOpaqueAuth): void {
const writer = this.writer;
const body = auth.body;
const length = body.size();
Iif (length > 400) throw new RpcEncodingError('Auth body too large');
writer.ensureCapacity(2 * 4 + length + 3);
const view = writer.view;
let x = writer.x;
view.setUint32(x, auth.flavor, false);
x += 4;
view.setUint32(x, length, false);
x += 4;
if (length > 0) {
writer.x = x;
writer.buf(body.subarray(0, length), length);
x = writer.x;
const padding = (4 - (length % 4)) % 4;
for (let i = 0; i < padding; i++) {
view.setUint8(x, 0);
x += 1;
}
}
writer.x = x;
}
}
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