[PATCH v2 6/6] error: move XlogGapError to box/error.h

[Vladimir Davydov <vdavydov.dev@gmail.com>]

All box exceptions belong to box/error.h. Let's move XlogGapError there
as well. This will facilitate conversion of recovery.cc to C when we
finally get to it. While we are at it, let's also move BuildXlogError
function declaration from diag.h to box/error.h, closer to its
definition.
---
 src/box/CMakeLists.txt |  2 +-
 src/box/error.cc       | 36 ++++++++++++++++++++++++++++++++----
 src/box/error.h        | 16 ++++++++++++++++
 src/box/recovery.cc    | 21 ---------------------
 src/diag.h             |  2 --
 5 files changed, 49 insertions(+), 28 deletions(-)

diff --git a/src/box/CMakeLists.txt b/src/box/CMakeLists.txt
index 6b1ae3e8..f4899091 100644
--- a/src/box/CMakeLists.txt
+++ b/src/box/CMakeLists.txt
@@ -21,7 +21,7 @@ set_property(DIRECTORY PROPERTY ADDITIONAL_MAKE_CLEAN_FILES ${lua_sources})
 
 include_directories(${ZSTD_INCLUDE_DIRS})
 
-add_library(box_error STATIC error.cc errcode.c)
+add_library(box_error STATIC error.cc errcode.c vclock.c)
 target_link_libraries(box_error core stat)
 
 add_library(vclock STATIC vclock.c)
diff --git a/src/box/error.cc b/src/box/error.cc
index 6b14dff0..c4f782a4 100644
--- a/src/box/error.cc
+++ b/src/box/error.cc
@@ -31,8 +31,11 @@
 #include "error.h"
 #include <stdio.h>
 
-#include <fiber.h>
-#include <rmean.h>
+#include "fiber.h"
+#include "rmean.h"
+#include "trigger.h"
+#include "vclock.h"
+#include "schema.h"
 
 /* {{{ public API */
 
@@ -176,8 +179,33 @@ BuildXlogError(const char *file, unsigned line, const char *format, ...)
 	}
 }
 
-#include "schema.h"
-#include "trigger.h"
+const struct type_info type_XlogGapError =
+	make_type("XlogGapError", &type_XlogError);
+
+XlogGapError::XlogGapError(const char *file, unsigned line,
+			   const struct vclock *from, const struct vclock *to)
+		: XlogError(&type_XlogGapError, file, line)
+{
+	char *s_from = vclock_to_string(from);
+	char *s_to = vclock_to_string(to);
+	snprintf(errmsg, sizeof(errmsg),
+		 "Missing .xlog file between LSN %lld %s and %lld %s",
+		 (long long) vclock_sum(from), s_from ? s_from : "",
+		 (long long) vclock_sum(to), s_to ? s_to : "");
+	free(s_from);
+	free(s_to);
+}
+
+struct error *
+BuildXlogGapError(const char *file, unsigned line,
+		  const struct vclock *from, const struct vclock *to)
+{
+	try {
+		return new XlogGapError(file, line, from, to);
+	} catch (OutOfMemory *e) {
+		return e;
+	}
+}
 
 struct rlist on_access_denied = RLIST_HEAD_INITIALIZER(on_access_denied);
 
diff --git a/src/box/error.h b/src/box/error.h
index c791e6c6..b8c7cf73 100644
--- a/src/box/error.h
+++ b/src/box/error.h
@@ -36,6 +36,8 @@
 extern "C" {
 #endif /* defined(__cplusplus) */
 
+struct vclock;
+
 struct error *
 BuildClientError(const char *file, unsigned line, uint32_t errcode, ...);
 
@@ -44,6 +46,12 @@ BuildAccessDeniedError(const char *file, unsigned int line,
 		       const char *access_type, const char *object_type,
 		       const char *object_name, const char *user_name);
 
+struct error *
+BuildXlogError(const char *file, unsigned line, const char *format, ...);
+
+struct error *
+BuildXlogGapError(const char *file, unsigned line,
+		  const struct vclock *from, const struct vclock *to);
 
 /** \cond public */
 
@@ -250,6 +258,14 @@ struct XlogError: public Exception
 	virtual void raise() { throw this; }
 };
 
+struct XlogGapError: public XlogError
+{
+	XlogGapError(const char *file, unsigned line,
+		     const struct vclock *from, const struct vclock *to);
+
+	virtual void raise() { throw this; }
+};
+
 #endif /* defined(__cplusplus) */
 
 #endif /* TARANTOOL_BOX_ERROR_H_INCLUDED */
diff --git a/src/box/recovery.cc b/src/box/recovery.cc
index 722b86c5..c007b1fa 100644
--- a/src/box/recovery.cc
+++ b/src/box/recovery.cc
@@ -74,27 +74,6 @@
  * IRR -> RR        # recovery_follow_local()
  */
 
-const struct type_info type_XlogGapError =
-	make_type("XlogGapError", &type_XlogError);
-
-struct XlogGapError: public XlogError {
-	/** Used by BuildXlogGapError() */
-	XlogGapError(const char *file, unsigned line,
-		     const struct vclock *from, const struct vclock *to)
-		:XlogError(&type_XlogGapError, file, line)
-	{
-		char *s_from = vclock_to_string(from);
-		char *s_to = vclock_to_string(to);
-		snprintf(errmsg, sizeof(errmsg),
-			 "Missing .xlog file between LSN %lld %s and %lld %s",
-			 (long long) vclock_sum(from), s_from ? s_from : "",
-			 (long long) vclock_sum(to), s_to ? s_to : "");
-		free(s_from);
-		free(s_to);
-	}
-	virtual void raise() { throw this; }
-};
-
 /* {{{ Initial recovery */
 
 /**
diff --git a/src/diag.h b/src/diag.h
index 0ccf86d0..a0b71f04 100644
--- a/src/diag.h
+++ b/src/diag.h
@@ -248,8 +248,6 @@ BuildIllegalParams(const char *file, unsigned line, const char *format, ...);
 struct error *
 BuildSystemError(const char *file, unsigned line, const char *format, ...);
 struct error *
-BuildXlogError(const char *file, unsigned line, const char *format, ...);
-struct error *
 BuildCollationError(const char *file, unsigned line, const char *format, ...);
 
 struct index_def;
-- 
2.11.0