logging: add LogPrintfCategory to log unconditionally with category

prefixing the output with the passed category name.

- add documentation
- add a unit test
- update lint-logs.py
- update lint-format-strings.py

src/logging.h

@@ -199,13 +199,18 @@ static inline void LogPrintf_(const std::string& logging_function, const std::st
     }
 }
 
-
 #define LogPrintLevel_(category, level, ...) LogPrintf_(__func__, __FILE__, __LINE__, category, level, __VA_ARGS__)
 
+// Log unconditionally.
 #define LogPrintf(...) LogPrintLevel_(BCLog::LogFlags::NONE, BCLog::Level::None, __VA_ARGS__)
 
+// Log unconditionally, prefixing the output with the passed category name.
+#define LogPrintfCategory(category, ...) LogPrintLevel_(category, BCLog::Level::None, __VA_ARGS__)
+
 // Use a macro instead of a function for conditional logging to prevent
 // evaluating arguments when logging for the category is not enabled.
+
+// Log conditionally, prefixing the output with the passed category name.
 #define LogPrint(category, ...)                                        \
     do {                                                               \
         if (LogAcceptCategory((category), BCLog::Level::Debug)) {      \
@@ -213,6 +218,7 @@ static inline void LogPrintf_(const std::string& logging_function, const std::st
         }                                                              \
     } while (0)
 
+// Log conditionally, prefixing the output with the passed category name and severity level.
 #define LogPrintLevel(category, level, ...)               \
     do {                                                  \
         if (LogAcceptCategory((category), (level))) {     \

src/test/logging_tests.cpp

@@ -103,6 +103,7 @@ BOOST_FIXTURE_TEST_CASE(logging_LogPrintMacros, LogSetup)
     LogPrintLevel(BCLog::NET, BCLog::Level::Info, "foo8: %s\n", "bar8");
     LogPrintLevel(BCLog::NET, BCLog::Level::Warning, "foo9: %s\n", "bar9");
     LogPrintLevel(BCLog::NET, BCLog::Level::Error, "foo10: %s\n", "bar10");
+    LogPrintfCategory(BCLog::VALIDATION, "foo11: %s\n", "bar11");
     std::ifstream file{tmp_log_path};
     std::vector<std::string> log_lines;
     for (std::string log; std::getline(file, log);) {
@@ -114,7 +115,9 @@ BOOST_FIXTURE_TEST_CASE(logging_LogPrintMacros, LogSetup)
         "[net:debug] foo7: bar7",
         "[net:info] foo8: bar8",
         "[net:warning] foo9: bar9",
-        "[net:error] foo10: bar10"};
+        "[net:error] foo10: bar10",
+        "[validation] foo11: bar11",
+    };
     BOOST_CHECK_EQUAL_COLLECTIONS(log_lines.begin(), log_lines.end(), expected.begin(), expected.end());
 }
 

test/lint/lint-format-strings.py

@@ -22,6 +22,7 @@ FUNCTION_NAMES_AND_NUMBER_OF_LEADING_ARGUMENTS = [
     'LogConnectFailure,1',
     'LogPrint,1',
     'LogPrintf,0',
+    'LogPrintfCategory,1',
     'LogPrintLevel,2',
     'printf,0',
     'snprintf,2',

test/lint/lint-logs.py

@@ -16,12 +16,12 @@ from subprocess import check_output
 
 
 def main():
-    logs_list = check_output(["git", "grep", "--extended-regexp", r"(LogPrintLevel|LogPrintf?)\(", "--", "*.cpp"], universal_newlines=True, encoding="utf8").splitlines()
+    logs_list = check_output(["git", "grep", "--extended-regexp", r"(LogPrintLevel|LogPrintfCategory|LogPrintf?)\(", "--", "*.cpp"], universal_newlines=True, encoding="utf8").splitlines()
 
     unterminated_logs = [line for line in logs_list if not re.search(r'(\\n"|/\* Continued \*/)', line)]
 
     if unterminated_logs != []:
-        print("All calls to LogPrintf(), LogPrint(), LogPrintLevel(), and WalletLogPrintf() should be terminated with \"\\n\".")
+        print("All calls to LogPrintf(), LogPrintfCategory(), LogPrint(), LogPrintLevel(), and WalletLogPrintf() should be terminated with \"\\n\".")
         print("")
 
         for line in unterminated_logs: