/
mod_doh.go
135 lines (112 loc) · 3.37 KB
/
mod_doh.go
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// Copyright (c) 2019 The BFE Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package mod_doh
import (
"fmt"
)
import (
"github.com/baidu/go-lib/web-monitor/metrics"
"github.com/baidu/go-lib/web-monitor/web_monitor"
)
import (
"github.com/bfenetworks/bfe/bfe_basic"
"github.com/bfenetworks/bfe/bfe_basic/condition"
"github.com/bfenetworks/bfe/bfe_http"
"github.com/bfenetworks/bfe/bfe_module"
)
const (
ModDoh = "mod_doh"
)
var (
openDebug = false
)
type ModuleDohState struct {
DohRequest *metrics.Counter
DohRequestNotSecure *metrics.Counter
FetchDnsErr *metrics.Counter
}
type ModuleDoh struct {
name string
state ModuleDohState
metrics metrics.Metrics
conf *ConfModDoh
cond condition.Condition
dnsFetcher DnsFetcher
}
func NewModuleDoh() *ModuleDoh {
m := new(ModuleDoh)
m.name = ModDoh
m.metrics.Init(&m.state, ModDoh, 0)
return m
}
func (m *ModuleDoh) Name() string {
return m.name
}
func (m *ModuleDoh) getState(params map[string][]string) ([]byte, error) {
s := m.metrics.GetAll()
return s.Format(params)
}
func (m *ModuleDoh) getStateDiff(params map[string][]string) ([]byte, error) {
s := m.metrics.GetDiff()
return s.Format(params)
}
func (m *ModuleDoh) monitorHandlers() map[string]interface{} {
handlers := map[string]interface{}{
m.name: m.getState,
m.name + ".diff": m.getStateDiff,
}
return handlers
}
func (m *ModuleDoh) dohHandler(req *bfe_basic.Request) (int, *bfe_http.Response) {
if !m.cond.Match(req) {
return bfe_module.BfeHandlerGoOn, nil
}
m.state.DohRequest.Inc(1)
if !req.Session.IsSecure {
m.state.DohRequestNotSecure.Inc(1)
return bfe_module.BfeHandlerResponse,
bfe_basic.CreateInternalResp(req, bfe_http.StatusForbidden)
}
resp, err := m.dnsFetcher.Fetch(req)
if err != nil {
m.state.FetchDnsErr.Inc(1)
return bfe_module.BfeHandlerResponse,
bfe_basic.CreateInternalResp(req, bfe_http.StatusInternalServerError)
}
return bfe_module.BfeHandlerResponse, resp
}
func (m *ModuleDoh) Init(cbs *bfe_module.BfeCallbacks, whs *web_monitor.WebHandlers,
cr string) error {
var err error
var cfg *ConfModDoh
confPath := bfe_module.ModConfPath(cr, m.name)
if cfg, err = ConfLoad(confPath, cr); err != nil {
return fmt.Errorf("%s.Init(): conf load err: %v", m.name, err)
}
openDebug = cfg.Log.OpenDebug
m.conf = cfg
m.dnsFetcher = NewDnsClient(&cfg.Dns)
if m.cond, err = condition.Build(cfg.Basic.Cond); err != nil {
return fmt.Errorf("%s.Init(): err in condition Build(): %v", m.name, err)
}
err = cbs.AddFilter(bfe_module.HandleFoundProduct, m.dohHandler)
if err != nil {
return fmt.Errorf("%s.Init(): AddFilter(m.dohHandler): %v", m.name, err)
}
err = web_monitor.RegisterHandlers(whs, web_monitor.WebHandleMonitor, m.monitorHandlers())
if err != nil {
return fmt.Errorf("%s.Init():RegisterHandlers(m.monitorHandlers): %v", m.name, err)
}
return nil
}