Merge pull request #61 from jsonjoy-com/nfs

NFSv3

Author: streamich

src/nfs/README.md

@@ -0,0 +1,5 @@
+# NFS (Network File System)
+
+## Resources
+
+- [NFSv3 RFC 1813](./v3/__tests__/rfc1813.txt)

src/nfs/v3/FullNfsv3Encoder.ts

@@ -0,0 +1,113 @@
+import {Writer} from '@jsonjoy.com/util/lib/buffers/Writer';
+import {Nfsv3Encoder} from './Nfsv3Encoder';
+import {RpcMessageEncoder} from '../../rpc/RpcMessageEncoder';
+import {RmRecordEncoder} from '../../rm/RmRecordEncoder';
+import {Nfsv3Proc, Nfsv3Const} from './constants';
+import {RpcOpaqueAuth} from '../../rpc/messages';
+import {RpcAcceptStat} from '../../rpc/constants';
+import type * as msg from './messages';
+import type {IWriter, IWriterGrowable} from '@jsonjoy.com/util/lib/buffers';
+
+const MAX_SINGLE_FRAME_SIZE = 0x7fffffff;
+const RM_HEADER_SIZE = 4;
+
+export class FullNfsv3Encoder<W extends IWriter & IWriterGrowable = IWriter & IWriterGrowable> {
+  protected readonly nfsEncoder: Nfsv3Encoder<W>;
+  protected readonly rpcEncoder: RpcMessageEncoder<W>;
+  protected readonly rmEncoder: RmRecordEncoder<W>;
+
+  constructor(
+    public program: number = 100003,
+    public readonly writer: W = new Writer() as any,
+  ) {
+    this.nfsEncoder = new Nfsv3Encoder(writer);
+    this.rpcEncoder = new RpcMessageEncoder(writer);
+    this.rmEncoder = new RmRecordEncoder(writer);
+  }
+
+  public encodeCall(
+    xid: number,
+    proc: Nfsv3Proc,
+    cred: RpcOpaqueAuth,
+    verf: RpcOpaqueAuth,
+    request: msg.Nfsv3Request,
+  ): Uint8Array {
+    this.writeCall(xid, proc, cred, verf, request);
+    return this.writer.flush();
+  }
+
+  public writeCall(
+    xid: number,
+    proc: Nfsv3Proc,
+    cred: RpcOpaqueAuth,
+    verf: RpcOpaqueAuth,
+    request: msg.Nfsv3Request,
+  ): void {
+    const writer = this.writer;
+    const rmHeaderPosition = writer.x;
+    writer.x += RM_HEADER_SIZE;
+    this.rpcEncoder.writeCall(xid, Nfsv3Const.PROGRAM, Nfsv3Const.VERSION, proc, cred, verf);
+    this.nfsEncoder.writeMessage(request, proc, true);
+    this.writeRmHeader(rmHeaderPosition, writer.x);
+  }
+
+  public encodeAcceptedReply(
+    xid: number,
+    proc: Nfsv3Proc,
+    verf: RpcOpaqueAuth,
+    response: msg.Nfsv3Response,
+  ): Uint8Array {
+    this.writeAcceptedReply(xid, proc, verf, response);
+    return this.writer.flush();
+  }
+
+  public writeAcceptedReply(xid: number, proc: Nfsv3Proc, verf: RpcOpaqueAuth, response: msg.Nfsv3Response): void {
+    const writer = this.writer;
+    const rmHeaderPosition = writer.x;
+    writer.x += RM_HEADER_SIZE;
+    this.rpcEncoder.writeAcceptedReply(xid, verf, RpcAcceptStat.SUCCESS);
+    this.nfsEncoder.writeMessage(response, proc, false);
+    this.writeRmHeader(rmHeaderPosition, writer.x);
+  }
+
+  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 writeRejectedReply(
+    xid: number,
+    rejectStat: number,
+    mismatchInfo?: {low: number; high: number},
+    authStat?: number,
+  ): void {
+    const writer = this.writer;
+    const rmHeaderPosition = writer.x;
+    writer.x += RM_HEADER_SIZE;
+    this.rpcEncoder.writeRejectedReply(xid, rejectStat, mismatchInfo, authStat);
+    this.writeRmHeader(rmHeaderPosition, writer.x);
+  }
+
+  private writeRmHeader(rmHeaderPosition: number, endPosition: number): void {
+    const writer = this.writer;
+    const rmEncoder = this.rmEncoder;
+    const totalSize = endPosition - rmHeaderPosition - RM_HEADER_SIZE;
+    if (totalSize <= MAX_SINGLE_FRAME_SIZE) {
+      const currentX = writer.x;
+      writer.x = rmHeaderPosition;
+      rmEncoder.writeHdr(1, totalSize);
+      writer.x = currentX;
+    } else {
+      const currentX = writer.x;
+      writer.x = rmHeaderPosition;
+      const data = writer.uint8.subarray(rmHeaderPosition + RM_HEADER_SIZE, currentX);
+      writer.reset();
+      rmEncoder.writeRecord(data);
+    }
+  }
+}