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Signed-off-by: disksing <i@disksing.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| // Copyright 2020 PingCAP, Inc. | ||
| // | ||
| // 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, | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package schedulers | ||
|
|
||
| import ( | ||
| "net/http" | ||
| "sync" | ||
|
|
||
| "github.com/gorilla/mux" | ||
| "github.com/pingcap/pd/v3/pkg/apiutil" | ||
| "github.com/pingcap/pd/v3/pkg/slice" | ||
| "github.com/pingcap/pd/v3/server/core" | ||
| "github.com/pingcap/pd/v3/server/schedule" | ||
| "github.com/pingcap/pd/v3/server/schedule/placement" | ||
| "github.com/unrolled/render" | ||
| ) | ||
|
|
||
| const ( | ||
| roleLeader = string(placement.Leader) | ||
| roleFollower = string(placement.Follower) | ||
| roleLearner = string(placement.Learner) | ||
| ) | ||
|
|
||
| var allRoles = []string{roleLeader, roleFollower, roleLearner} | ||
|
|
||
| type shuffleRegionSchedulerConfig struct { | ||
| sync.RWMutex | ||
| storage *core.Storage | ||
|
|
||
| Ranges []core.KeyRange `json:"ranges"` | ||
| Roles []string `json:"roles"` // can include `leader`, `follower`, `learner`. | ||
| } | ||
|
|
||
| func (conf *shuffleRegionSchedulerConfig) EncodeConfig() ([]byte, error) { | ||
| conf.RLock() | ||
| defer conf.RUnlock() | ||
| return schedule.EncodeConfig(conf) | ||
| } | ||
|
|
||
| func (conf *shuffleRegionSchedulerConfig) GetRoles() []string { | ||
| conf.RLock() | ||
| defer conf.RUnlock() | ||
| return conf.Roles | ||
| } | ||
|
|
||
| func (conf *shuffleRegionSchedulerConfig) GetRanges() []core.KeyRange { | ||
| conf.RLock() | ||
| defer conf.RUnlock() | ||
| return conf.Ranges | ||
| } | ||
|
|
||
| func (conf *shuffleRegionSchedulerConfig) IsRoleAllow(role string) bool { | ||
| conf.RLock() | ||
| defer conf.RUnlock() | ||
| return slice.AnyOf(conf.Roles, func(i int) bool { return conf.Roles[i] == role }) | ||
| } | ||
|
|
||
| func (conf *shuffleRegionSchedulerConfig) ServeHTTP(w http.ResponseWriter, r *http.Request) { | ||
| router := mux.NewRouter() | ||
| router.HandleFunc("/roles", conf.handleGetRoles).Methods("GET") | ||
| router.HandleFunc("/roles", conf.handleSetRoles).Methods("POST") | ||
| router.ServeHTTP(w, r) | ||
| } | ||
|
|
||
| func (conf *shuffleRegionSchedulerConfig) handleGetRoles(w http.ResponseWriter, r *http.Request) { | ||
| rd := render.New(render.Options{IndentJSON: true}) | ||
| rd.JSON(w, http.StatusOK, conf.GetRoles()) | ||
| } | ||
|
|
||
| func (conf *shuffleRegionSchedulerConfig) handleSetRoles(w http.ResponseWriter, r *http.Request) { | ||
| rd := render.New(render.Options{IndentJSON: true}) | ||
| var roles []string | ||
| if err := apiutil.ReadJSONRespondError(rd, w, r.Body, &roles); err != nil { | ||
| return | ||
| } | ||
| for _, r := range roles { | ||
| if slice.NoneOf(allRoles, func(i int) bool { return allRoles[i] == r }) { | ||
| rd.Text(w, http.StatusBadRequest, "invalid role:"+r) | ||
| return | ||
| } | ||
| } | ||
|
|
||
| conf.Lock() | ||
| defer conf.Unlock() | ||
| old := conf.Roles | ||
| conf.Roles = roles | ||
| if err := conf.persist(); err != nil { | ||
| conf.Roles = old // revert | ||
| rd.Text(w, http.StatusInternalServerError, err.Error()) | ||
| return | ||
| } | ||
| rd.Text(w, http.StatusOK, "") | ||
| } | ||
|
|
||
| func (conf *shuffleRegionSchedulerConfig) persist() error { | ||
| data, err := schedule.EncodeConfig(conf) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return conf.storage.SaveScheduleConfig(ShuffleRegionName, data) | ||
| } |
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