silicube 0.3.1

A library for sandboxed code execution
Documentation 
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
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140

//! Compilation step for code execution
//!
//! Handles compiling source code using language-specific compilers.

use tracing::{debug, instrument};

use crate::config::language::DEFAULT_SANDBOX_PATH;
use crate::config::{Config, Language};
use crate::isolate::{IsolateAction, IsolateBox, IsolateCommand, resolve_command, run_with_output};
use crate::runner::CompileError;
use crate::types::{ExecutionResult, ResourceLimits};

/// Result of a compilation
#[derive(Debug, Clone)]
pub struct CompileResult {
    /// Whether compilation succeeded
    pub success: bool,

    /// Execution result from the compilation process
    pub execution: ExecutionResult,

    /// Compiler output (usually stderr for error messages)
    pub output: String,
}

impl CompileResult {
    /// Check if compilation was successful
    pub fn is_success(&self) -> bool {
        self.success && self.execution.exit_code == Some(0)
    }
}

/// Default compilation limits
fn default_compile_limits() -> ResourceLimits {
    ResourceLimits {
        time_limit: Some(30.0),      // 30 seconds
        wall_time_limit: Some(60.0), // 60 seconds wall time
        memory_limit: Some(524288),  // 512 MB
        max_processes: Some(10),     // Allow multiple processes for compilers
        max_output: Some(65536),     // 64 MB output
        ..Default::default()
    }
}

/// Compile source code in an isolate box
#[instrument(skip(sandbox, config, source))]
pub async fn compile(
    sandbox: &IsolateBox,
    config: &Config,
    language: &Language,
    source: &[u8],
    limits: Option<&ResourceLimits>,
) -> Result<CompileResult, CompileError> {
    // Check if language requires compilation
    let compile_config = language
        .compile
        .as_ref()
        .ok_or_else(|| CompileError::NotCompiled(language.name.clone()))?;

    // Write source file to sandbox
    let source_name = &compile_config.source_name;
    sandbox
        .write_file(source_name, source)
        .await
        .map_err(CompileError::Isolate)?;

    debug!(source_name, "wrote source file");

    // Determine limits
    let base_limits = default_compile_limits();
    let lang_limits = compile_config.limits.as_ref();
    let effective_limits = match (limits, lang_limits) {
        (Some(user), Some(lang)) => base_limits.with_overrides(lang).with_overrides(user),
        (Some(user), None) => base_limits.with_overrides(user),
        (None, Some(lang)) => base_limits.with_overrides(lang),
        (None, None) => base_limits,
    };

    // Build compile command with resolved path (isolate uses execve, not execvp)
    let mut expanded_cmd = Language::expand_command(
        &compile_config.command,
        source_name,
        &compile_config.output_name,
    );
    resolve_command(&mut expanded_cmd).map_err(CompileError::Isolate)?;

    let mut command = IsolateCommand::new(config.isolate_binary(), sandbox.id())
        .action(IsolateAction::Run)
        .cgroup(config.cgroup)
        .limits(effective_limits)
        .working_dir("/box")
        .env("PATH", DEFAULT_SANDBOX_PATH)
        .mounts(config.sandbox_mounts.iter().cloned())
        .command(expanded_cmd);

    // Add environment variables from compile config
    for (key, value) in &compile_config.env {
        command = command.env(key, value);
    }

    // Run compilation
    let (result, mut output) = run_with_output(sandbox, command)
        .await
        .map_err(CompileError::Isolate)?;

    let success = result.exit_code == Some(0);

    debug!(
        success,
        exit_code = ?result.exit_code,
        status = ?result.status,
        message = ?result.message,
        "compilation complete"
    );

    // Include isolate's error message in output if the sandboxed process produced nothing
    if output.is_empty()
        && let Some(ref msg) = result.message
    {
        output = msg.clone();
    }

    Ok(CompileResult {
        success,
        execution: result,
        output,
    })
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_default_compile_limits() {
        let limits = default_compile_limits();
        assert_eq!(limits.time_limit, Some(30.0));
        assert_eq!(limits.memory_limit, Some(524288));
    }
}