[performance] more logging tweaks (#4415)

- reduces number of necessary function calls by moving log level checking out of the uninlineable `logf(...)` function and into each of its caller (which are all inlined). this in turn means the log level check is performed in-situ wherever a call to `log.Debug(...)` (etc) is made, reduce unnecessary calls when a certain log level is disabled.
- sets the http.Server{}.ErrorLog to output to our internal logging package (which in turn ensures it gets wrapped in either our logfmt or json log formatting)

Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4415
Co-authored-by: kim <grufwub@gmail.com>
Co-committed-by: kim <grufwub@gmail.com>

1 files changed, 43 insertions, 0 deletions

diff --git a/internal/log/std.go b/internal/log/std.go
new file mode 100644
index 000000000..47adec128
--- /dev/null
+++ b/internal/log/std.go
@@ -0,0 +1,43 @@
+// GoToSocial
+// Copyright (C) GoToSocial Authors admin@gotosocial.org
+// SPDX-License-Identifier: AGPL-3.0-or-later
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package log
+
+import (
+	"log"
+
+	"codeberg.org/gruf/go-kv/v2"
+)
+
+// NewStdLogger returns a new standard library
+// log.Logger instance that will write output
+// to this library's logging functions at 'lvl'.
+func NewStdLogger(lvl LEVEL) *log.Logger {
+	return log.New(stdLogWriter{lvl: lvl}, "", 0)
+}
+
+type stdLogWriter struct{ lvl LEVEL }
+
+func (w stdLogWriter) Write(b []byte) (int, error) {
+	if w.lvl <= loglvl {
+		logf(nil, w.lvl, kv.Fields{
+			{K: "caller", V: Caller(5)},
+			{K: "msg", V: b},
+		}, "")
+	}
+	return len(b), nil
+}