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I am not a lawyer, but according to the appendix of the license, these boilerplate notices should be included with every source file.
84 lines
2.0 KiB
Go
84 lines
2.0 KiB
Go
// Copyright 2015 Light Code Labs, LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package expvar
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import (
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"expvar"
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"runtime"
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"sync"
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"github.com/mholt/caddy"
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"github.com/mholt/caddy/caddyhttp/httpserver"
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)
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func init() {
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caddy.RegisterPlugin("expvar", caddy.Plugin{
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ServerType: "http",
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Action: setup,
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})
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}
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// setup configures a new ExpVar middleware instance.
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func setup(c *caddy.Controller) error {
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resource, err := expVarParse(c)
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if err != nil {
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return err
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}
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// publish any extra information/metrics we may want to capture
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publishExtraVars()
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ev := ExpVar{Resource: resource}
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httpserver.GetConfig(c).AddMiddleware(func(next httpserver.Handler) httpserver.Handler {
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ev.Next = next
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return ev
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})
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return nil
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}
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func expVarParse(c *caddy.Controller) (Resource, error) {
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var resource Resource
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var err error
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for c.Next() {
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args := c.RemainingArgs()
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switch len(args) {
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case 0:
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resource = Resource(defaultExpvarPath)
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case 1:
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resource = Resource(args[0])
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default:
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return resource, c.ArgErr()
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}
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}
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return resource, err
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}
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func publishExtraVars() {
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// By using sync.Once instead of an init() function, we don't clutter
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// the app's expvar export unnecessarily, or risk colliding with it.
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publishOnce.Do(func() {
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expvar.Publish("Goroutines", expvar.Func(func() interface{} {
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return runtime.NumGoroutine()
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}))
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})
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}
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var publishOnce sync.Once // publishing variables should only be done once
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var defaultExpvarPath = "/debug/vars"
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