2ba56d8186
Added typed config struct for unmapped glyph names configuration: - unmapped_glyph_names: Vec<String> - list of glyph names to skip - description: Option<String> - optional documentation - version: Option<String> - format version identifier The struct represents the JSON structure from build/unmapped-glyph-names.json and is ready for parsing implementation in follow-up beads. Closes bf-3vo80. Verification: notes/bf-3vo80.md
83 lines
2.9 KiB
Markdown
83 lines
2.9 KiB
Markdown
# Bead bf-688te: Implement spawn_mcp_server() function with RAII guard
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## Status: COMPLETE ✅
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## Summary
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The `spawn_mcp_server()` function and `McpServerGuard` RAII guard were already fully implemented in `/home/coding/pdftract/crates/pdftract-cli/tests/TH-05-ssrf-block.rs`.
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## Acceptance Criteria - ALL PASS ✅
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### ✅ PASS: spawn_mcp_server() function exists and returns a guard type
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- **Location**: Lines 83-99
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- **Implementation**:
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```rust
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fn spawn_mcp_server() -> McpServerGuard {
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let child = Command::new(PDFTRACT)
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.arg("mcp")
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.arg("--stdio")
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.stdin(Stdio::piped())
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.stdout(Stdio::piped())
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.stderr(Stdio::null()) // Discard stderr to avoid pipe buffer blocking
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.spawn()
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.expect("Failed to spawn pdftract mcp --stdio");
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McpServerGuard::new(child)
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}
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```
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### ✅ PASS: Guard type implements Drop and kills the child process
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- **Location**: Lines 27-81 (McpServerGuard struct)
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- **Drop implementation** (lines 52-81):
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1. Closes stdin to signal EOF (graceful shutdown)
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2. Waits with bounded 200ms timeout using `try_wait()`
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3. Falls back to `kill()` if graceful shutdown fails
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4. Never uses blocking `wait()`
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### ✅ PASS: No orphaned processes after guard is dropped
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- RAII guard ensures cleanup on drop (even if test panics)
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- Bounded waits prevent hanging (200ms timeout)
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- Force-kill fallback ensures termination
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### ✅ PASS: Stdio::null() for stderr to avoid pipe buffer blocking
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- Line 94: `.stderr(Stdio::null())`
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- Comment explains the rationale: "Discard stderr to avoid pipe buffer blocking"
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### N/A: Binds to port :0 if applicable
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- Not applicable for stdio mode (uses stdin/stdout pipes, not network ports)
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- If HTTP bind mode were used, would bind to `127.0.0.1:0` and read back the assigned port
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## Test Coverage
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The implementation is used by 7 test cases in the same file:
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1. `test_ipv4_loopback_blocked` (line 200)
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2. `test_ipv4_wildcard_blocked` (line 279)
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3. `test_cloud_metadata_blocked` (line 346)
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4. `test_rfc1918_private_blocked` (line 413)
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5. `test_ipv6_loopback_blocked` (line 480)
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6. `test_http_scheme_rejected` (line 548)
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7. `test_no_network_connection_attempted` (line 619)
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All tests properly use the RAII guard pattern:
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```rust
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let mut server = spawn_mcp_server();
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// ... use server ...
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// Guard automatically drops here, cleaning up the child process
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```
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## Verification
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- ✅ Code review confirms all acceptance criteria met
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- ✅ Implementation follows TH-03 lessons (bounded waits, no blocking wait(), Stdio::null())
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- ✅ RAII pattern ensures cleanup even on panic
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- ✅ No orphaned processes possible
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## References
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- File: `/home/coding/pdftract/crates/pdftract-cli/tests/TH-05-ssrf-block.rs`
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- Related: TH-03 (MCP server without authentication)
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- Plan: Threat Model (TH-05 SSRF protection)
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## Conclusion
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The task is **already complete**. The implementation is production-ready and follows all best practices for subprocess management in Rust test code.
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