2022-08-16 09:48:06 +00:00
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// Copyright (c) 2016 Uber Technologies, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package zapcore
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import "go.uber.org/multierr"
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type hooked struct {
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Core
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funcs []func(Entry) error
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}
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2022-10-06 10:24:15 +00:00
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var (
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_ Core = (*hooked)(nil)
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_ leveledEnabler = (*hooked)(nil)
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)
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2022-08-16 09:48:06 +00:00
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// RegisterHooks wraps a Core and runs a collection of user-defined callback
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// hooks each time a message is logged. Execution of the callbacks is blocking.
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//
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// This offers users an easy way to register simple callbacks (e.g., metrics
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// collection) without implementing the full Core interface.
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func RegisterHooks(core Core, hooks ...func(Entry) error) Core {
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funcs := append([]func(Entry) error{}, hooks...)
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return &hooked{
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Core: core,
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funcs: funcs,
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}
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}
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2022-10-06 10:24:15 +00:00
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func (h *hooked) Level() Level {
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return LevelOf(h.Core)
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}
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2022-08-16 09:48:06 +00:00
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func (h *hooked) Check(ent Entry, ce *CheckedEntry) *CheckedEntry {
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// Let the wrapped Core decide whether to log this message or not. This
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// also gives the downstream a chance to register itself directly with the
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// CheckedEntry.
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if downstream := h.Core.Check(ent, ce); downstream != nil {
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return downstream.AddCore(ent, h)
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}
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return ce
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}
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func (h *hooked) With(fields []Field) Core {
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return &hooked{
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Core: h.Core.With(fields),
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funcs: h.funcs,
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}
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}
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func (h *hooked) Write(ent Entry, _ []Field) error {
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// Since our downstream had a chance to register itself directly with the
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// CheckedMessage, we don't need to call it here.
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var err error
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for i := range h.funcs {
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err = multierr.Append(err, h.funcs[i](ent))
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}
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return err
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}
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