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# Description Adds JSON logging as an optional alternative log output format. In the process this moves our log formatting itself into a separate subpkg to make it more easily modular, and improves caller name getting with some calling function name caching. ## Checklist - [x] I/we have read the [GoToSocial contribution guidelines](https://codeberg.org/superseriousbusiness/gotosocial/src/branch/main/CONTRIBUTING.md). - [x] I/we have discussed the proposed changes already, either in an issue on the repository, or in the Matrix chat. - [x] I/we have not leveraged AI to create the proposed changes. - [x] I/we have performed a self-review of added code. - [x] I/we have written code that is legible and maintainable by others. - [x] I/we have commented the added code, particularly in hard-to-understand areas. - [x] I/we have made any necessary changes to documentation. - [ ] I/we have added tests that cover new code. - [x] I/we have run tests and they pass locally with the changes. - [x] I/we have run `go fmt ./...` and `golangci-lint run`. Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4355 Co-authored-by: kim <grufwub@gmail.com> Co-committed-by: kim <grufwub@gmail.com>
90 lines
2.8 KiB
Go
90 lines
2.8 KiB
Go
// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package format
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import (
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"sync/atomic"
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"time"
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"code.superseriousbusiness.org/gotosocial/internal/log/level"
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"codeberg.org/gruf/go-byteutil"
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"codeberg.org/gruf/go-kv/v2"
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)
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var (
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// ensure func signature conformance.
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_ FormatFunc = (*Logfmt)(nil).Format
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_ FormatFunc = (*JSON)(nil).Format
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)
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// FormatFunc defines a function capable of formatting a log entry (args = 1+) to a given buffer (args = 0).
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type FormatFunc func(buf *byteutil.Buffer, stamp time.Time, pc uintptr, lvl level.LEVEL, kvs []kv.Field, msg string) //nolint:revive
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type Base struct {
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// TimeFormat defines time.Format() layout to
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// use when appending a timestamp to log entry.
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TimeFormat string
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// stampCache caches recently formatted stamps.
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//
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// see the following benchmark:
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// goos: linux
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// goarch: amd64
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// pkg: code.superseriousbusiness.org/gotosocial/internal/log/format
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// cpu: AMD Ryzen 7 7840U w/ Radeon 780M Graphics
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// BenchmarkStampCache
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// BenchmarkStampCache-16 272199975 4.447 ns/op 0 B/op 0 allocs/op
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// BenchmarkNoStampCache
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// BenchmarkNoStampCache-16 76041058 15.94 ns/op 0 B/op 0 allocs/op
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stampCache atomic.Pointer[struct {
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stamp time.Time
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format string
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}]
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}
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// AppendFormatStamp will append given timestamp according to TimeFormat,
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// caching recently formatted stamp strings to reduce number of Format() calls.
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func (b *Base) AppendFormatStamp(buf *byteutil.Buffer, stamp time.Time) {
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const precision = time.Millisecond
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// Load cached stamp value.
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last := b.stampCache.Load()
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// Round stamp to min precision.
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stamp = stamp.Round(precision)
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// If a cached entry exists use this string.
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if last != nil && stamp.Equal(last.stamp) {
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buf.B = append(buf.B, last.format...)
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return
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}
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// Else format new and store ASAP,
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// i.e. ignoring any CAS result.
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format := stamp.Format(b.TimeFormat)
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b.stampCache.CompareAndSwap(last, &struct {
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stamp time.Time
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format string
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}{
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stamp: stamp,
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format: format,
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})
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// Finally, append new timestamp.
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buf.B = append(buf.B, format...)
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}
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