handler.go

Documentation: golang.org/x/net/internal/quic/qlog

     1  // Copyright 2023 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build go1.21
     6  
     7  package qlog
     8  
     9  import (
    10  	"context"
    11  	"log/slog"
    12  )
    13  
    14  type withAttrsHandler struct {
    15  	attrs []slog.Attr
    16  	h     slog.Handler
    17  }
    18  
    19  func withAttrs(h slog.Handler, attrs []slog.Attr) slog.Handler {
    20  	if len(attrs) == 0 {
    21  		return h
    22  	}
    23  	return &withAttrsHandler{attrs: attrs, h: h}
    24  }
    25  
    26  func (h *withAttrsHandler) Enabled(ctx context.Context, level slog.Level) bool {
    27  	return h.h.Enabled(ctx, level)
    28  }
    29  
    30  func (h *withAttrsHandler) Handle(ctx context.Context, r slog.Record) error {
    31  	r.AddAttrs(h.attrs...)
    32  	return h.h.Handle(ctx, r)
    33  }
    34  
    35  func (h *withAttrsHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
    36  	return withAttrs(h, attrs)
    37  }
    38  
    39  func (h *withAttrsHandler) WithGroup(name string) slog.Handler {
    40  	return withGroup(h, name)
    41  }
    42  
    43  type withGroupHandler struct {
    44  	name string
    45  	h    slog.Handler
    46  }
    47  
    48  func withGroup(h slog.Handler, name string) slog.Handler {
    49  	if name == "" {
    50  		return h
    51  	}
    52  	return &withGroupHandler{name: name, h: h}
    53  }
    54  
    55  func (h *withGroupHandler) Enabled(ctx context.Context, level slog.Level) bool {
    56  	return h.h.Enabled(ctx, level)
    57  }
    58  
    59  func (h *withGroupHandler) Handle(ctx context.Context, r slog.Record) error {
    60  	var attrs []slog.Attr
    61  	r.Attrs(func(a slog.Attr) bool {
    62  		attrs = append(attrs, a)
    63  		return true
    64  	})
    65  	nr := slog.NewRecord(r.Time, r.Level, r.Message, r.PC)
    66  	nr.Add(slog.Any(h.name, slog.GroupValue(attrs...)))
    67  	return h.h.Handle(ctx, nr)
    68  }
    69  
    70  func (h *withGroupHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
    71  	return withAttrs(h, attrs)
    72  }
    73  
    74  func (h *withGroupHandler) WithGroup(name string) slog.Handler {
    75  	return withGroup(h, name)
    76  }
    77
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