1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
// Copyright 2018 the Deno authors. All rights reserved. MIT license.
import { Reader, Writer, Closer, ReadResult } from "./io";
import * as dispatch from "./dispatch";
import * as msg from "gen/msg_generated";
import { assert } from "./util";
import { flatbuffers } from "flatbuffers";
export class File implements Reader, Writer, Closer {
constructor(readonly rid: number) {}
write(p: ArrayBufferView): Promise<number> {
return write(this.rid, p);
}
read(p: ArrayBufferView): Promise<ReadResult> {
return read(this.rid, p);
}
close(): void {
close(this.rid);
}
}
export const stdin = new File(0);
export const stdout = new File(1);
export const stderr = new File(2);
// TODO This is just a placeholder - not final API.
export type OpenMode = "r" | "w" | "w+" | "x";
export function create(filename: string): Promise<File> {
return open(filename, "x");
}
export async function open(
filename: string,
mode: OpenMode = "r"
): Promise<File> {
const builder = new flatbuffers.Builder();
const filename_ = builder.createString(filename);
msg.Open.startOpen(builder);
msg.Open.addFilename(builder, filename_);
const inner = msg.Open.endOpen(builder);
const baseRes = await dispatch.sendAsync(builder, msg.Any.Open, inner);
assert(baseRes != null);
assert(msg.Any.OpenRes === baseRes!.innerType());
const res = new msg.OpenRes();
assert(baseRes!.inner(res) != null);
const rid = res.rid();
return new File(rid);
}
export async function read(
rid: number,
p: ArrayBufferView
): Promise<ReadResult> {
const builder = new flatbuffers.Builder();
msg.Read.startRead(builder);
msg.Read.addRid(builder, rid);
const inner = msg.Read.endRead(builder);
const baseRes = await dispatch.sendAsync(builder, msg.Any.Read, inner, p);
assert(baseRes != null);
assert(msg.Any.ReadRes === baseRes!.innerType());
const res = new msg.ReadRes();
assert(baseRes!.inner(res) != null);
return { nread: res.nread(), eof: res.eof() };
}
export async function write(rid: number, p: ArrayBufferView): Promise<number> {
const builder = new flatbuffers.Builder();
msg.Write.startWrite(builder);
msg.Write.addRid(builder, rid);
const inner = msg.Write.endWrite(builder);
const baseRes = await dispatch.sendAsync(builder, msg.Any.Write, inner, p);
assert(baseRes != null);
assert(msg.Any.WriteRes === baseRes!.innerType());
const res = new msg.WriteRes();
assert(baseRes!.inner(res) != null);
return res.nbyte();
}
export function close(rid: number): void {
const builder = new flatbuffers.Builder();
msg.Close.startClose(builder);
msg.Close.addRid(builder, rid);
const inner = msg.Close.endClose(builder);
dispatch.sendSync(builder, msg.Any.Close, inner);
}
|
