| /* |
| Copyright 2015 The Kubernetes 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 util |
| |
| import ( |
| "encoding/json" |
| "fmt" |
| "io/ioutil" |
| "net/http" |
| |
| etcd "github.com/coreos/etcd/client" |
| ) |
| |
| // IsEtcdNotFound returns true if and only if err is an etcd not found error. |
| func IsEtcdNotFound(err error) bool { |
| return isEtcdErrorNum(err, etcd.ErrorCodeKeyNotFound) |
| } |
| |
| // IsEtcdNodeExist returns true if and only if err is an etcd node already exist error. |
| func IsEtcdNodeExist(err error) bool { |
| return isEtcdErrorNum(err, etcd.ErrorCodeNodeExist) |
| } |
| |
| // IsEtcdTestFailed returns true if and only if err is an etcd write conflict. |
| func IsEtcdTestFailed(err error) bool { |
| return isEtcdErrorNum(err, etcd.ErrorCodeTestFailed) |
| } |
| |
| // IsEtcdWatchExpired returns true if and only if err indicates the watch has expired. |
| func IsEtcdWatchExpired(err error) bool { |
| // NOTE: This seems weird why it wouldn't be etcd.ErrorCodeWatcherCleared |
| // I'm using the previous matching value |
| return isEtcdErrorNum(err, etcd.ErrorCodeEventIndexCleared) |
| } |
| |
| // IsEtcdUnreachable returns true if and only if err indicates the server could not be reached. |
| func IsEtcdUnreachable(err error) bool { |
| // NOTE: The logic has changed previous error code no longer applies |
| return err == etcd.ErrClusterUnavailable |
| } |
| |
| // isEtcdErrorNum returns true if and only if err is an etcd error, whose errorCode matches errorCode |
| func isEtcdErrorNum(err error, errorCode int) bool { |
| if err != nil { |
| if etcdError, ok := err.(etcd.Error); ok { |
| return etcdError.Code == errorCode |
| } |
| // NOTE: There are other error types returned |
| } |
| return false |
| } |
| |
| // GetEtcdVersion performs a version check against the provided Etcd server, |
| // returning the string response, and error (if any). |
| func GetEtcdVersion(host string) (string, error) { |
| response, err := http.Get(host + "/version") |
| if err != nil { |
| return "", err |
| } |
| defer response.Body.Close() |
| if response.StatusCode != http.StatusOK { |
| return "", fmt.Errorf("unsuccessful response from etcd server %q: %v", host, err) |
| } |
| versionBytes, err := ioutil.ReadAll(response.Body) |
| if err != nil { |
| return "", err |
| } |
| return string(versionBytes), nil |
| } |
| |
| type etcdHealth struct { |
| // Note this has to be public so the json library can modify it. |
| Health string `json:"health"` |
| } |
| |
| func EtcdHealthCheck(data []byte) error { |
| obj := etcdHealth{} |
| if err := json.Unmarshal(data, &obj); err != nil { |
| return err |
| } |
| if obj.Health != "true" { |
| return fmt.Errorf("Unhealthy status: %s", obj.Health) |
| } |
| return nil |
| } |