完成对SPJ的支持

xml rpc不能使用None

judge/spj_client.py

@@ -0,0 +1,26 @@
+# coding=utf-8
+import os
+import judger
+
+WA = 1
+AC = 0
+SPJ_ERROR = -1
+
+
+def file_exists(path):
+    return os.path.exists(path)
+
+
+def spj(path, max_cpu_time, max_memory, in_path, user_out_path):
+    if file_exists(in_path) and file_exists(user_out_path):
+        result = judger.run(path=path, in_file="/dev/null", out_file="/dev/null",
+                            max_cpu_time=max_cpu_time, max_memory=max_memory,
+                            args=[in_path, user_out_path], env=["PATH=" + os.environ.get("PATH", "")],
+                            use_sandbox=True, use_nobody=True)
+        if result["signal"] == 0 and result["exit_status"] in [AC, WA, SPJ_ERROR]:
+            result["spj_result"] = result["exit_status"]
+        else:
+            result["spj_result"] = SPJ_ERROR
+        return result
+    else:
+        raise ValueError("in_path or user_out_path does not exist")