floria 0.0.5

Floria data system for cloud orchestration
Documentation 
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use super::errors::*;

use anyhow::Context;

//
// Environment
//

/// Wasm environment for plugins.
///
/// Cloning is cheap and clones always refer to the same shared state.
#[derive(Debug, Clone)]
pub struct Environment {
    /// Wasmtime engine.
    pub engine: wasmtime::Engine,
}

impl Environment {
    /// Constructor.
    pub fn new(debug: bool) -> Result<Self, PluginError> {
        let mut config = wasmtime::Config::new();

        // This *must* be enabled just to load Wasm with debug info, even if we don't use a debugger
        config.debug_info(debug);

        // This *must* be enabled just to load Wasm with backtrace info
        // (The default is to check WASMTIME_BACKTRACE_DETAILS env var)
        config.wasm_backtrace_details(if debug {
            wasmtime::WasmBacktraceDetails::Enable
        } else {
            wasmtime::WasmBacktraceDetails::Disable
        });

        // This isn't very helpful to us
        // #[cfg(feature = "wasm-debug")]
        // config.coredump_on_trap(debug);

        tracing::debug!("wasmtime configuration:\n{:#?}", config);
        let engine = wasmtime::Engine::new(&config)
            .context("initializing wasmtime engine")
            .map_err(PluginError::InstantiateWasm)?;

        Ok(Self { engine })
    }
}