Fix: Add check for HANDSHAKE err

[irounik]

Fixes: #1666

Summary by CodeRabbit

• Bug Fixes
  • Enhanced error handling during critical command processing to ensure that handshake operations occur only when preceding steps succeed, thereby preventing unintended behavior and improving overall system stability.

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[coderabbitai]

Walkthrough

The change updates the control flow in the StartSync method of the IOThread struct. A new condition now ensures that the "HANDSHAKE" command is only processed if no error occurred in the earlier command reading process. This prevents executing handshake logic, including the assignment of ClientID and Mode, when there is an error detected.

Changes

File	Change Summary
internal/.../iothread.go	Updated StartSync method to process "HANDSHAKE" only when err == nil, preventing unintended behavior.

Sequence Diagram(s)

sequenceDiagram
    participant C as Client
    participant T as IOThread
    C->>T: Send "HANDSHAKE" command
    T->>T: Read command and check for error (err)
    alt No Error (err == nil)
        T->>T: Process handshake (assign ClientID and Mode)
    else Error Occurred
        T->>C: Skip handshake processing
    end

Loading

Assessment against linked issues

Objective	Addressed	Explanation
Prevent server crash when HANDSHAKE command is missing arguments (#1666)	✅

Poem

Oh, what a hop in the code today,
Where errors are chased far away,
A handshake guarded with care so fine,
No more crashes crossing the line,
A rabbit’s nod to design divine! 🐇

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📜 Recent review details

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📥 Commits

Reviewing files that changed from the base of the PR and between f2201d4 and 802c328.

📒 Files selected for processing (1)

• internal/server/ironhawk/iothread.go (1 hunks)

🔇 Additional comments (1)

internal/server/ironhawk/iothread.go (1)

61-64:

❓ Verification inconclusive

Good fix for preventing handshake processing during errors.

The added && err == nil condition ensures that client ID and mode are only set from the handshake arguments when the command execution is successful, preventing potential issues with invalid data during error scenarios.

However, I noticed that line 59 still unconditionally updates t.ClientID = _c.ClientID regardless of errors, which might partially counteract this fix in some cases. Consider reviewing this behavior in a follow-up PR.

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🏁 Script executed:

#!/bin/bash
# Check how the ClientID is used throughout the codebase
rg "ClientID" --type go

Length of output: 1499

---

Action: Verify Unconditional ClientID Update on Line 59

Great job on adding the error guard for handshake processing on lines 61–64. The addition of && err == nil properly ensures that the handshake arguments are applied only when the command executes successfully, preventing erroneous data assignments.

However, in internal/server/ironhawk/iothread.go (line 59), the assignment t.ClientID = _c.ClientID is still performed unconditionally. Given that ClientID is widely used throughout the codebase—as confirmed by our grep results—this unguarded update might inadvertently counteract the benefits of the handshake fix. Please review this behavior and consider addressing it in a follow-up PR.

• File: internal/server/ironhawk/iothread.go
  • Line 59: Unconditional t.ClientID = _c.ClientID
  • Lines 61–64: Conditional assignment with && err == nil is correctly applied

✨ Finishing Touches

• 📝 Generate Docstrings

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[arpitbbhayani]

thanks for the patch, but this change is already merged through some other PR.