[Tarantool-patches] [PATCH V4 5/6] error: update constructors of some errors

[Leonid Vasiliev <lvasiliev@tarantool.org>]

We want to have a transparent marshalling through net.box
for errors. To do this, we need to recreate the error
on the client side with the same parameters as on the server.
For convenience, we update AccessDeniedError constructor
which has points to static strings and add the XlogGapError
constructor that does not require vclock.

Needed for #4398
---
 src/box/error.cc | 18 +++++++++---------
 src/box/error.h  |  8 ++++++--
 2 files changed, 15 insertions(+), 11 deletions(-)

diff --git a/src/box/error.cc b/src/box/error.cc
index c8fadfb..cb134ba 100644
--- a/src/box/error.cc
+++ b/src/box/error.cc
@@ -253,6 +253,13 @@ XlogGapError::XlogGapError(const char *file, unsigned line,
 		 (long long) vclock_sum(to), s_to ? s_to : "");
 }
 
+XlogGapError::XlogGapError(const char *file, unsigned line,
+			   const char *msg)
+		: XlogError(&type_XlogGapError, file, line)
+{
+	error_format_msg(this, "%s", msg);
+}
+
 struct error *
 BuildXlogGapError(const char *file, unsigned line,
 		  const struct vclock *from, const struct vclock *to)
@@ -289,15 +296,8 @@ AccessDeniedError::AccessDeniedError(const char *file, unsigned int line,
 
 	struct on_access_denied_ctx ctx = {access_type, object_type, object_name};
 	trigger_run(&on_access_denied, (void *) &ctx);
-	/*
-	 * We want to use ctx parameters as error parameters
-	 * later, so we have to alloc space for it.
-	 * As m_access_type and m_object_type are constant
-	 * literals they are statically  allocated. We must copy
-	 * only m_object_name.
-	 */
-	m_object_type = object_type;
-	m_access_type = access_type;
+	m_object_type = strdup(object_type);
+	m_access_type = strdup(access_type);
 	m_object_name = strdup(object_name);
 }
 
diff --git a/src/box/error.h b/src/box/error.h
index 311d543..f70d6cb 100644
--- a/src/box/error.h
+++ b/src/box/error.h
@@ -244,6 +244,8 @@ public:
 	~AccessDeniedError()
 	{
 		free(m_object_name);
+		free(m_object_type);
+		free(m_access_type);
 	}
 
 	const char *
@@ -266,11 +268,11 @@ public:
 
 private:
 	/** Type of object the required access was denied to */
-	const char *m_object_type;
+	char *m_object_type;
 	/** Name of object the required access was denied to */
 	char *m_object_name;
 	/** Type of declined access */
-	const char *m_access_type;
+	char *m_access_type;
 };
 
 /**
@@ -300,6 +302,8 @@ struct XlogGapError: public XlogError
 {
 	XlogGapError(const char *file, unsigned line,
 		     const struct vclock *from, const struct vclock *to);
+	XlogGapError(const char *file, unsigned line,
+		     const char *msg);
 
 	virtual void raise() { throw this; }
 };
-- 
2.7.4