From f630c28439e8d59abeaad252ee84aaf26842d6a3 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Thu, 23 Aug 2018 04:19:32 -0700
Subject: [PATCH] ircd::db: Add error_to_status conversion for rocksdb::Status.

---
 ircd/db.cc | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 ircd/db.h  |  9 ++++++++
 2 files changed, 71 insertions(+)

diff --git a/ircd/db.cc b/ircd/db.cc
index d069a7483..b10c24758 100644
--- a/ircd/db.cc
+++ b/ircd/db.cc
@@ -9,6 +9,7 @@
 // full license for this software is available in the LICENSE file.
 
 #include <rocksdb/version.h>
+#include <rocksdb/status.h>
 #include <rocksdb/db.h>
 #include <rocksdb/cache.h>
 #include <rocksdb/comparator.h>
@@ -6793,6 +6794,67 @@ ircd::db::valid(const rocksdb::Iterator &it)
 	return it.Valid();
 }
 
+//
+// error_to_status
+//
+
+ircd::db::error_to_status::error_to_status(const fs::error &e)
+:error_to_status{e.code}
+{
+}
+
+ircd::db::error_to_status::error_to_status(const std::exception &e)
+:rocksdb::Status
+{
+	Status::Aborted(slice(string_view(e.what())))
+}
+{
+}
+
+ircd::db::error_to_status::error_to_status(const std::error_code &e)
+:rocksdb::Status{[&e]
+{
+	using std::errc;
+
+	switch(e.value())
+	{
+		case 0:
+			return Status::OK();
+
+		case int(errc::no_such_file_or_directory):
+			return Status::NotFound();
+
+		case int(errc::not_supported):
+			return Status::NotSupported();
+
+		case int(errc::invalid_argument):
+			return Status::InvalidArgument();
+
+		case int(errc::io_error):
+			 return Status::IOError();
+
+		case int(errc::timed_out):
+			return Status::TimedOut();
+
+		case int(errc::device_or_resource_busy):
+			return Status::Busy();
+
+		case int(errc::resource_unavailable_try_again):
+			return Status::TryAgain();
+
+		case int(errc::no_space_on_device):
+			return Status::NoSpace();
+
+		case int(errc::not_enough_memory):
+			return Status::MemoryLimit();
+
+		default:
+			return Status::Aborted(slice(string_view(e.message())));
+	}
+}()}
+{
+}
+
 //
 // throw_on_error
 //
diff --git a/ircd/db.h b/ircd/db.h
index 7f915a452..7786608d3 100644
--- a/ircd/db.h
+++ b/ircd/db.h
@@ -33,6 +33,7 @@
 namespace ircd::db
 {
 	struct throw_on_error;
+	struct error_to_status;
 
 	const auto BLOCKING = rocksdb::ReadTier::kReadAllTier;
 	const auto NON_BLOCKING = rocksdb::ReadTier::kBlockCacheTier;
@@ -100,3 +101,11 @@ struct ircd::db::throw_on_error
 {
 	throw_on_error(const rocksdb::Status & = rocksdb::Status::OK());
 };
+
+struct ircd::db::error_to_status
+:rocksdb::Status
+{
+	error_to_status(const std::error_code &);
+	error_to_status(const fs::error &);
+	error_to_status(const std::exception &);
+};