wasmx 0.0.0

High-performance, embeddable WebAssembly execution engine
Documentation 
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use anyhow::{anyhow, Context as _};
use wasmtime::component::Resource;

use crate::engine::bindings::wasi::cli::{
    environment, exit, stderr, stdin, stdout, terminal_input, terminal_output, terminal_stderr,
    terminal_stdin, terminal_stdout,
};
use crate::engine::wasi::cli::{I32Exit, TerminalInput, TerminalOutput};
use crate::engine::wasi::io::{InputStream, OutputStream};
use crate::Ctx;

impl terminal_input::Host for Ctx {}
impl terminal_output::Host for Ctx {}

impl terminal_input::HostTerminalInput for Ctx {
    fn drop(&mut self, rep: Resource<TerminalInput>) -> wasmtime::Result<()> {
        self.table
            .delete(rep)
            .context("failed to delete input resource from table")?;
        Ok(())
    }
}

impl terminal_output::HostTerminalOutput for Ctx {
    fn drop(&mut self, rep: Resource<TerminalOutput>) -> wasmtime::Result<()> {
        self.table
            .delete(rep)
            .context("failed to delete output resource from table")?;
        Ok(())
    }
}

impl terminal_stdin::Host for Ctx {
    fn get_terminal_stdin(&mut self) -> wasmtime::Result<Option<Resource<TerminalInput>>> {
        if self.cli.stdin.is_terminal() {
            let fd = self
                .table
                .push(TerminalInput)
                .context("failed to push terminal resource to table")?;
            Ok(Some(fd))
        } else {
            Ok(None)
        }
    }
}

impl terminal_stdout::Host for Ctx {
    fn get_terminal_stdout(&mut self) -> wasmtime::Result<Option<Resource<TerminalOutput>>> {
        if self.cli.stdout.is_terminal() {
            let fd = self
                .table
                .push(TerminalOutput)
                .context("failed to push terminal resource to table")?;
            Ok(Some(fd))
        } else {
            Ok(None)
        }
    }
}

impl terminal_stderr::Host for Ctx {
    fn get_terminal_stderr(&mut self) -> wasmtime::Result<Option<Resource<TerminalOutput>>> {
        if self.cli.stderr.is_terminal() {
            let fd = self
                .table
                .push(TerminalOutput)
                .context("failed to push terminal resource to table")?;
            Ok(Some(fd))
        } else {
            Ok(None)
        }
    }
}

impl stdin::Host for Ctx {
    fn get_stdin(&mut self) -> wasmtime::Result<Resource<InputStream>> {
        // TODO: Implement
        let stream = self
            .table
            .push(InputStream::Empty)
            .context("failed to push input stream resource to table")?;
        Ok(stream)
    }
}

impl stdout::Host for Ctx {
    fn get_stdout(&mut self) -> wasmtime::Result<Resource<OutputStream>> {
        // TODO: Configure
        let stream = self
            .table
            .push(OutputStream::Stdout(std::io::stdout()))
            .context("failed to push output stream resource to table")?;
        Ok(stream)
    }
}

impl stderr::Host for Ctx {
    fn get_stderr(&mut self) -> wasmtime::Result<Resource<OutputStream>> {
        // TODO: Configure
        let stream = self
            .table
            .push(OutputStream::Stderr(std::io::stderr()))
            .context("failed to push output stream resource to table")?;
        Ok(stream)
    }
}

impl environment::Host for Ctx {
    fn get_environment(&mut self) -> wasmtime::Result<Vec<(String, String)>> {
        Ok(self.cli.environment.clone())
    }

    fn get_arguments(&mut self) -> wasmtime::Result<Vec<String>> {
        Ok(self.cli.arguments.clone())
    }

    fn initial_cwd(&mut self) -> wasmtime::Result<Option<String>> {
        Ok(self.cli.initial_cwd.clone())
    }
}

impl exit::Host for Ctx {
    fn exit(&mut self, status: Result<(), ()>) -> wasmtime::Result<()> {
        let status = match status {
            Ok(()) => 0,
            Err(()) => 1,
        };
        Err(anyhow!(I32Exit(status)))
    }

    fn exit_with_code(&mut self, status_code: u8) -> wasmtime::Result<()> {
        Err(anyhow!(I32Exit(status_code.into())))
    }
}