mirror of
https://github.com/denoland/deno.git
synced 2024-12-12 02:27:46 -05:00
262 lines
8 KiB
Markdown
262 lines
8 KiB
Markdown
# Deno Docs
|
|
|
|
## Install
|
|
|
|
Deno works on OSX, Linux, and Windows. We provide binary download scripts:
|
|
|
|
With Python:
|
|
|
|
```
|
|
curl -sSf https://raw.githubusercontent.com/denoland/deno_install/master/install.py | python
|
|
```
|
|
|
|
See also [deno_install](https://github.com/denoland/deno_install).
|
|
|
|
With PowerShell:
|
|
|
|
```powershell
|
|
iex (iwr https://raw.githubusercontent.com/denoland/deno_install/master/install.ps1)
|
|
```
|
|
|
|
_Note: Depending on your security settings, you may have to run
|
|
`Set-ExecutionPolicy RemoteSigned -Scope CurrentUser` first to allow downloaded
|
|
scripts to be executed._
|
|
|
|
Try it:
|
|
|
|
```
|
|
> deno http://deno.land/thumb.ts
|
|
```
|
|
|
|
## API Reference
|
|
|
|
To get an exact reference of deno's runtime API, run the following in the
|
|
command line:
|
|
|
|
```
|
|
deno --types
|
|
```
|
|
|
|
In case you don't have it installed yet, but are curious, here is an out-of-date
|
|
copy of the output: https://gist.github.com/78855aeeaddeef7c1fce0aeb8ffef8b2
|
|
|
|
(We do not yet have an HTML version of this. See
|
|
https://github.com/denoland/deno/issues/573)
|
|
|
|
## Examples
|
|
|
|
### Example: An implementation of the unix "cat" program
|
|
|
|
The copy here is actually zero-copy. That is, it reads data from the socket and
|
|
writes it back to it without ever calling a memcpy() or similar.
|
|
|
|
```ts
|
|
import * as deno from "deno";
|
|
|
|
for (let i = 1; i < deno.args.length; i++) {
|
|
let filename = deno.args[i];
|
|
let file = await deno.open(filename);
|
|
await deno.copy(deno.stdout, file);
|
|
}
|
|
```
|
|
|
|
### Example: A TCP Server echo server
|
|
|
|
The copy here is actually zero-copy. That is, it reads data from the socket and
|
|
writes it back to it without ever calling a memcpy() or similar.
|
|
|
|
```ts
|
|
import { listen, accept, copy } from "deno";
|
|
const listener = listen("tcp", ":8080");
|
|
while (true) {
|
|
const conn = await listener.accept();
|
|
deno.copy(conn, conn);
|
|
}
|
|
// TODO top level await doesn't work yet.
|
|
```
|
|
|
|
## How to Profile Deno.
|
|
|
|
```sh
|
|
# Make sure we're only building release.
|
|
export DENO_BUILD_MODE=release
|
|
# Build deno and V8's d8.
|
|
./tools/build.py d8 deno
|
|
# Start the program we want to benchmark with --prof
|
|
./out/release/deno tests/http_bench.ts --allow-net --prof &
|
|
# Exercise it.
|
|
third_party/wrk/linux/wrk http://localhost:4500/
|
|
kill `pgrep deno`
|
|
# When supplying --prof, V8 will write a file in the current directory that
|
|
# looks like this isolate-0x7fad98242400-v8.log
|
|
# To examine this file
|
|
D8_PATH=out/release/ ./third_party/v8/tools/linux-tick-processor
|
|
isolate-0x7fad98242400-v8.log
|
|
```
|
|
|
|
## Build instructions (for advanced users only)
|
|
|
|
### Prerequisists:
|
|
|
|
To ensure reproducible builds, Deno has most of its dependencies in a git
|
|
submodule. However, you need to install separately:
|
|
|
|
1. [Rust](https://www.rust-lang.org/en-US/install.html)
|
|
2. [Node](http://nodejs.org/)
|
|
3. Python 2.
|
|
[Not 3](https://github.com/denoland/deno/issues/464#issuecomment-411795578).
|
|
4. [ccache](https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Build_Instructions/ccache)
|
|
(Optional but helpful for speeding up rebuilds of V8.).
|
|
5. Extra steps for Windows users:
|
|
1. Add `python.exe` to `PATH`. E.g. `set PATH=%PATH%;C:\Python27\python.exe`
|
|
2. Get [VS Community 2017](https://www.visualstudio.com/downloads/), make
|
|
sure to select the option to install C++ tools and the Windows SDK
|
|
3. Enable `Debugging Tools for Windows`, Goto Control Panel -> Windows 10 SDK
|
|
-> Right-Click -> Change -> Change -> Check Debugging Tools for Windows ->
|
|
Change -> Finish
|
|
6. Before running `./tools/format.py`, make sure you have `yapf` installed for
|
|
the current Python and `rustfmt` for Rust. They can be installed by:
|
|
|
|
pip install yapf rustup component add rustfmt-preview
|
|
|
|
### Build:
|
|
|
|
# Fetch deps.
|
|
git clone --recurse-submodules https://github.com/denoland/deno.git
|
|
cd deno
|
|
./tools/setup.py
|
|
|
|
# Build.
|
|
./tools/build.py
|
|
|
|
# Run.
|
|
./out/debug/deno tests/002_hello.ts
|
|
|
|
# Test.
|
|
./tools/test.py
|
|
|
|
# Format code.
|
|
./tools/format.py
|
|
|
|
Other useful commands:
|
|
|
|
# Call ninja manually.
|
|
./third_party/depot_tools/ninja -C out/debug
|
|
|
|
# Build a release binary.
|
|
DENO_BUILD_MODE=release ./tools/build.py :deno
|
|
|
|
# List executable targets.
|
|
./third_party/depot_tools/gn ls out/debug //:* --as=output --type=executable
|
|
|
|
# List build configuation.
|
|
./third_party/depot_tools/gn args out/debug/ --list
|
|
|
|
# Edit build configuration.
|
|
./third_party/depot_tools/gn args out/debug/
|
|
|
|
# Describe a target.
|
|
./third_party/depot_tools/gn desc out/debug/ :deno
|
|
./third_party/depot_tools/gn help
|
|
|
|
Env vars: `DENO_BUILD_MODE`, `DENO_BUILD_PATH`, `DENO_BUILD_ARGS`, `DENO_DIR`.
|
|
|
|
## Internals
|
|
|
|
### Interal: libdeno API.
|
|
|
|
Deno's privileged side will primarily be programmed in Rust. However there will
|
|
be a small C API that wraps V8 to 1) define the low-level message passing
|
|
semantics 2) provide a low-level test target 3) provide an ANSI C API binding
|
|
interface for Rust. V8 plus this C API is called libdeno and the important bits
|
|
of the API is specified here:
|
|
https://github.com/denoland/deno/blob/master/libdeno/deno.h
|
|
https://github.com/denoland/deno/blob/master/js/libdeno.ts
|
|
|
|
### Internal: Flatbuffers provide shared data between Rust and V8
|
|
|
|
We use Flatbuffers to define common structs and enums between TypeScript and
|
|
Rust. These common data structures are defined in
|
|
https://github.com/denoland/deno/blob/master/src/msg.fbs
|
|
|
|
## Contributing
|
|
|
|
See
|
|
[CONTRIBUTING.md](https://github.com/denoland/deno/blob/master/.github/CONTRIBUTING.md).
|
|
|
|
## Change Log
|
|
|
|
### 2018.10.18 / v0.1.8 / Connecting to Tokio / Fleshing out APIs
|
|
|
|
Most file system ops were implemented. Basic TCP networking is implemented.
|
|
Basic stdio streams exposed. And many random OS facilities were exposed (e.g.
|
|
environmental variables)
|
|
|
|
Tokio was chosen as the backing event loop library. A careful mapping of JS
|
|
Promises onto Rust Futures was made, preserving error handling and the ability
|
|
to execute synchronously in the main thread.
|
|
|
|
Continuous benchmarks were added: https://denoland.github.io/deno/ Performance
|
|
issues are beginning to be addressed.
|
|
|
|
"deno --types" was added to reference runtime APIs.
|
|
|
|
Working towards https://github.com/denoland/deno/milestone/2 We expect v0.2 to
|
|
be released in last October or early November.
|
|
|
|
### 2018.09.09 / v0.1.3 / Scale binding infrastructure
|
|
|
|
ETA v.0.2 October 2018 https://github.com/denoland/deno/milestone/2
|
|
|
|
We decided to use Tokio https://tokio.rs/ to provide asynchronous I/O, thread
|
|
pool execution, and as a base for high level support for various internet
|
|
protocols like HTTP. Tokio is strongly designed around the idea of Futures -
|
|
which map quite well onto JavaScript promises. We want to make it as easy as
|
|
possible to start a Tokio future from JavaScript and get a Promise for handling
|
|
it. We expect this to result in preliminary file system operations, fetch() for
|
|
http. Additionally we are working on CI, release, and benchmarking
|
|
infrastructure to scale development.
|
|
|
|
### 2018.08.23 / v0.1.0 / Rust rewrite / V8 snapshot
|
|
|
|
https://github.com/denoland/deno/commit/68d388229ea6ada339d68eb3d67feaff7a31ca97
|
|
|
|
Complete! https://github.com/denoland/deno/milestone/1
|
|
|
|
Go is a garbage collected language and we are worried that combining it with
|
|
V8's GC will lead to difficult contention problems down the road.
|
|
|
|
The V8Worker2 binding/concept is being ported to a new C++ library called
|
|
libdeno. libdeno will include the entire JS runtime as a V8 snapshot. It still
|
|
follows the message passing paradigm. Rust will be bound to this library to
|
|
implement the privileged part of Deno. See deno2/README.md for more details.
|
|
|
|
V8 Snapshots allow Deno to avoid recompiling the TypeScript compiler at startup.
|
|
This is already working.
|
|
|
|
When the rewrite is at feature parity with the Go prototype, we will release
|
|
binaries for people to try.
|
|
|
|
### 2018.09.32 / v0.0.0 / Golang Prototype / JSConf talk
|
|
|
|
https://github.com/denoland/deno/tree/golang
|
|
|
|
https://www.youtube.com/watch?v=M3BM9TB-8yA
|
|
|
|
http://tinyclouds.org/jsconf2018.pdf
|
|
|
|
### 2007-2017 / Prehistory
|
|
|
|
https://github.com/ry/v8worker
|
|
|
|
http://libuv.org/
|
|
|
|
http://tinyclouds.org/iocp-links.html
|
|
|
|
https://nodejs.org/
|
|
|
|
https://github.com/nodejs/http-parser
|
|
|
|
http://tinyclouds.org/libebb/
|
|
|
|
https://en.wikipedia.org/wiki/Merb
|