From 7850d3ba6de4edebffccd2ee5dc54fe73d8ba696 Mon Sep 17 00:00:00 2001
From: bvvvp009 <smartcrypto0@gmail.com>
Date: Tue, 23 Dec 2025 14:34:15 +0530
Subject: [PATCH] fix: Change MarketIndex from uint8_t to int16_t to support
 spot markets

Fixes #106

Spot market orders (market_id >= 2048) were incorrectly routed to perps
market 0 due to uint8_t overflow. The uint8_t type (max 255) was truncating
spot market IDs (2048+) to 0.

Updated CreateOrderTxReq struct MarketIndex field from uint8_t to int16_t
in Python ctypes definition and all platform header files to match
lighter-go sharedlib fix.
---
 lighter/signer_client.py                       | 2 +-
 lighter/signers/lighter-signer-darwin-arm64.h  | 2 +-
 lighter/signers/lighter-signer-linux-amd64.h   | 2 +-
 lighter/signers/lighter-signer-linux-arm64.h   | 2 +-
 lighter/signers/lighter-signer-windows-amd64.h | 2 +-
 5 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/lighter/signer_client.py b/lighter/signer_client.py
index c1bb252..2364c56 100644
--- a/lighter/signer_client.py
+++ b/lighter/signer_client.py
@@ -29,7 +29,7 @@ class ApiKeyResponse(ctypes.Structure):
 
 class CreateOrderTxReq(ctypes.Structure):
     _fields_ = [
-        ("MarketIndex", ctypes.c_uint8),
+        ("MarketIndex", ctypes.c_int16),
         ("ClientOrderIndex", ctypes.c_longlong),
         ("BaseAmount", ctypes.c_longlong),
         ("Price", ctypes.c_uint32),
diff --git a/lighter/signers/lighter-signer-darwin-arm64.h b/lighter/signers/lighter-signer-darwin-arm64.h
index 307323c..e2f9e86 100644
--- a/lighter/signers/lighter-signer-darwin-arm64.h
+++ b/lighter/signers/lighter-signer-darwin-arm64.h
@@ -43,7 +43,7 @@ typedef struct {
 } ApiKeyResponse;
 
 typedef struct {
-    uint8_t MarketIndex;
+    int16_t MarketIndex;
     int64_t ClientOrderIndex;
     int64_t BaseAmount;
     uint32_t Price;
diff --git a/lighter/signers/lighter-signer-linux-amd64.h b/lighter/signers/lighter-signer-linux-amd64.h
index b097024..2b3ae4b 100644
--- a/lighter/signers/lighter-signer-linux-amd64.h
+++ b/lighter/signers/lighter-signer-linux-amd64.h
@@ -43,7 +43,7 @@ typedef struct {
 } ApiKeyResponse;
 
 typedef struct {
-    uint8_t MarketIndex;
+    int16_t MarketIndex;
     int64_t ClientOrderIndex;
     int64_t BaseAmount;
     uint32_t Price;
diff --git a/lighter/signers/lighter-signer-linux-arm64.h b/lighter/signers/lighter-signer-linux-arm64.h
index b097024..2b3ae4b 100644
--- a/lighter/signers/lighter-signer-linux-arm64.h
+++ b/lighter/signers/lighter-signer-linux-arm64.h
@@ -43,7 +43,7 @@ typedef struct {
 } ApiKeyResponse;
 
 typedef struct {
-    uint8_t MarketIndex;
+    int16_t MarketIndex;
     int64_t ClientOrderIndex;
     int64_t BaseAmount;
     uint32_t Price;
diff --git a/lighter/signers/lighter-signer-windows-amd64.h b/lighter/signers/lighter-signer-windows-amd64.h
index 164e01c..44a69af 100644
--- a/lighter/signers/lighter-signer-windows-amd64.h
+++ b/lighter/signers/lighter-signer-windows-amd64.h
@@ -43,7 +43,7 @@ typedef struct {
 } ApiKeyResponse;
 
 typedef struct {
-    uint8_t MarketIndex;
+    int16_t MarketIndex;
     int64_t ClientOrderIndex;
     int64_t BaseAmount;
     uint32_t Price;