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Merge pull request #217 from wasmerio/feature/wasi-for-the-wasm-c-api
Implement WASI for the Wasm C API
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,17 @@ | ||
| #[macro_export] | ||
| macro_rules! c_try { | ||
| ($expr:expr) => {{ | ||
| let res: Result<_, _> = $expr; | ||
| match res { | ||
| Ok(val) => val, | ||
| Err(err) => { | ||
| crate::error::update_last_error(err); | ||
| return None; | ||
| } | ||
| } | ||
| }}; | ||
| ($expr:expr, $e:expr) => {{ | ||
| let opt: Option<_> = $expr; | ||
| c_try!(opt.ok_or_else(|| $e)) | ||
| }}; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| //! Default implementations for capturing the stdout/stderr output of a WASI program. | ||
| use serde::{Deserialize, Serialize}; | ||
| use std::collections::VecDeque; | ||
| use std::io::{self, Read, Seek, Write}; | ||
| use wasmer_wasi::{WasiFile, WasiFsError}; | ||
|
|
||
| /// For capturing stdout/stderr. Stores all output in a string. | ||
| #[derive(Debug, Serialize, Deserialize)] | ||
| pub struct OutputCapturer { | ||
| pub(crate) buffer: VecDeque<u8>, | ||
| } | ||
|
|
||
| impl OutputCapturer { | ||
| pub fn new() -> Self { | ||
| Self { | ||
| buffer: VecDeque::new(), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| #[typetag::serde] | ||
| impl WasiFile for OutputCapturer { | ||
| fn last_accessed(&self) -> u64 { | ||
| 0 | ||
| } | ||
| fn last_modified(&self) -> u64 { | ||
| 0 | ||
| } | ||
| fn created_time(&self) -> u64 { | ||
| 0 | ||
| } | ||
| fn size(&self) -> u64 { | ||
| 0 | ||
| } | ||
| fn set_len(&mut self, _len: u64) -> Result<(), WasiFsError> { | ||
| Ok(()) | ||
| } | ||
| fn unlink(&mut self) -> Result<(), WasiFsError> { | ||
| Ok(()) | ||
| } | ||
| fn bytes_available(&self) -> Result<usize, WasiFsError> { | ||
| // return an arbitrary amount | ||
| Ok(1024) | ||
| } | ||
| } | ||
|
|
||
| // fail when reading or Seeking | ||
| impl Read for OutputCapturer { | ||
| fn read(&mut self, _buf: &mut [u8]) -> io::Result<usize> { | ||
| Err(io::Error::new( | ||
| io::ErrorKind::Other, | ||
| "can not read from capturing stdout", | ||
| )) | ||
| } | ||
| fn read_to_end(&mut self, _buf: &mut Vec<u8>) -> std::io::Result<usize> { | ||
| Err(std::io::Error::new( | ||
| std::io::ErrorKind::Other, | ||
| "can not read from capturing stdout", | ||
| )) | ||
| } | ||
| fn read_to_string(&mut self, _buf: &mut String) -> io::Result<usize> { | ||
| Err(io::Error::new( | ||
| io::ErrorKind::Other, | ||
| "can not read from capturing stdout", | ||
| )) | ||
| } | ||
| fn read_exact(&mut self, _buf: &mut [u8]) -> io::Result<()> { | ||
| Err(io::Error::new( | ||
| io::ErrorKind::Other, | ||
| "can not read from capturing stdout", | ||
| )) | ||
| } | ||
| } | ||
| impl Seek for OutputCapturer { | ||
| fn seek(&mut self, _pos: io::SeekFrom) -> io::Result<u64> { | ||
| Err(io::Error::new( | ||
| io::ErrorKind::Other, | ||
| "can not seek capturing stdout", | ||
| )) | ||
| } | ||
| } | ||
| impl Write for OutputCapturer { | ||
| fn write(&mut self, buf: &[u8]) -> io::Result<usize> { | ||
| self.buffer.extend(buf); | ||
| Ok(buf.len()) | ||
| } | ||
| fn flush(&mut self) -> io::Result<()> { | ||
| Ok(()) | ||
| } | ||
| fn write_all(&mut self, buf: &[u8]) -> io::Result<()> { | ||
| self.buffer.extend(buf); | ||
| Ok(()) | ||
| } | ||
| } |
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