github.com/erda-project/erda-infra@v1.0.9/providers/expvar/provider.go (about)

     1  // Copyright (c) 2021 Terminus, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package expvar
    16  
    17  import (
    18  	"expvar"
    19  	"fmt"
    20  	"net/http"
    21  	"os"
    22  
    23  	"github.com/erda-project/erda-infra/base/servicehub"
    24  	"github.com/erda-project/erda-infra/providers/httpserver"
    25  )
    26  
    27  type config struct {
    28  	Publish []string `file:"publish"`
    29  }
    30  
    31  // +provider
    32  type provider struct {
    33  	Cfg    *config
    34  	Router httpserver.Router `autowired:"http-server@admin"`
    35  }
    36  
    37  // Run this is optional
    38  func (p *provider) Init(ctx servicehub.Context) error {
    39  	for _, item := range p.Cfg.Publish {
    40  		v, ok := defaultVars[item]
    41  		if !ok {
    42  			return fmt.Errorf("var %q not exit", item)
    43  		}
    44  		expvar.Publish(item, v)
    45  	}
    46  	p.Router.Add(http.MethodGet, "/debug/vars", expvar.Handler())
    47  	return nil
    48  }
    49  
    50  var defaultVars = map[string]expvar.Var{
    51  	"envs": expvar.Func(func() interface{} {
    52  		return os.Environ()
    53  	}),
    54  }
    55  
    56  func init() {
    57  	servicehub.Register("expvar", &servicehub.Spec{
    58  		Services:    []string{"expvar"},
    59  		Description: "expvar",
    60  		ConfigFunc:  func() interface{} { return &config{} },
    61  		Creator: func() servicehub.Provider {
    62  			return &provider{}
    63  		},
    64  	})
    65  }