3f1a7d4fdd
This will be necessary for go mod work Additionally, the srv api has changed. This adapts to it.
304 lines
7.1 KiB
Go
304 lines
7.1 KiB
Go
// Copyright 2015 The etcd Authors
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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 client
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import (
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"net/http"
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"net/url"
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"path"
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"go.etcd.io/etcd/pkg/types"
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)
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var (
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defaultV2MembersPrefix = "/v2/members"
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defaultLeaderSuffix = "/leader"
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)
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type Member struct {
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// ID is the unique identifier of this Member.
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ID string `json:"id"`
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// Name is a human-readable, non-unique identifier of this Member.
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Name string `json:"name"`
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// PeerURLs represents the HTTP(S) endpoints this Member uses to
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// participate in etcd's consensus protocol.
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PeerURLs []string `json:"peerURLs"`
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// ClientURLs represents the HTTP(S) endpoints on which this Member
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// serves its client-facing APIs.
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ClientURLs []string `json:"clientURLs"`
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}
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type memberCollection []Member
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func (c *memberCollection) UnmarshalJSON(data []byte) error {
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d := struct {
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Members []Member
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}{}
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if err := json.Unmarshal(data, &d); err != nil {
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return err
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}
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if d.Members == nil {
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*c = make([]Member, 0)
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return nil
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}
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*c = d.Members
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return nil
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}
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type memberCreateOrUpdateRequest struct {
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PeerURLs types.URLs
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}
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func (m *memberCreateOrUpdateRequest) MarshalJSON() ([]byte, error) {
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s := struct {
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PeerURLs []string `json:"peerURLs"`
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}{
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PeerURLs: make([]string, len(m.PeerURLs)),
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}
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for i, u := range m.PeerURLs {
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s.PeerURLs[i] = u.String()
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}
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return json.Marshal(&s)
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}
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// NewMembersAPI constructs a new MembersAPI that uses HTTP to
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// interact with etcd's membership API.
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func NewMembersAPI(c Client) MembersAPI {
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return &httpMembersAPI{
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client: c,
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}
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}
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type MembersAPI interface {
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// List enumerates the current cluster membership.
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List(ctx context.Context) ([]Member, error)
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// Add instructs etcd to accept a new Member into the cluster.
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Add(ctx context.Context, peerURL string) (*Member, error)
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// Remove demotes an existing Member out of the cluster.
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Remove(ctx context.Context, mID string) error
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// Update instructs etcd to update an existing Member in the cluster.
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Update(ctx context.Context, mID string, peerURLs []string) error
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// Leader gets current leader of the cluster
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Leader(ctx context.Context) (*Member, error)
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}
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type httpMembersAPI struct {
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client httpClient
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}
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func (m *httpMembersAPI) List(ctx context.Context) ([]Member, error) {
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req := &membersAPIActionList{}
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resp, body, err := m.client.Do(ctx, req)
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if err != nil {
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return nil, err
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}
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if err := assertStatusCode(resp.StatusCode, http.StatusOK); err != nil {
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return nil, err
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}
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var mCollection memberCollection
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if err := json.Unmarshal(body, &mCollection); err != nil {
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return nil, err
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}
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return []Member(mCollection), nil
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}
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func (m *httpMembersAPI) Add(ctx context.Context, peerURL string) (*Member, error) {
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urls, err := types.NewURLs([]string{peerURL})
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if err != nil {
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return nil, err
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}
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req := &membersAPIActionAdd{peerURLs: urls}
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resp, body, err := m.client.Do(ctx, req)
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if err != nil {
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return nil, err
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}
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if err := assertStatusCode(resp.StatusCode, http.StatusCreated, http.StatusConflict); err != nil {
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return nil, err
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}
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if resp.StatusCode != http.StatusCreated {
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var merr membersError
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if err := json.Unmarshal(body, &merr); err != nil {
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return nil, err
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}
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return nil, merr
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}
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var memb Member
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if err := json.Unmarshal(body, &memb); err != nil {
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return nil, err
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}
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return &memb, nil
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}
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func (m *httpMembersAPI) Update(ctx context.Context, memberID string, peerURLs []string) error {
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urls, err := types.NewURLs(peerURLs)
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if err != nil {
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return err
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}
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req := &membersAPIActionUpdate{peerURLs: urls, memberID: memberID}
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resp, body, err := m.client.Do(ctx, req)
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if err != nil {
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return err
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}
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if err := assertStatusCode(resp.StatusCode, http.StatusNoContent, http.StatusNotFound, http.StatusConflict); err != nil {
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return err
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}
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if resp.StatusCode != http.StatusNoContent {
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var merr membersError
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if err := json.Unmarshal(body, &merr); err != nil {
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return err
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}
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return merr
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}
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return nil
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}
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func (m *httpMembersAPI) Remove(ctx context.Context, memberID string) error {
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req := &membersAPIActionRemove{memberID: memberID}
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resp, _, err := m.client.Do(ctx, req)
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if err != nil {
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return err
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}
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return assertStatusCode(resp.StatusCode, http.StatusNoContent, http.StatusGone)
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}
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func (m *httpMembersAPI) Leader(ctx context.Context) (*Member, error) {
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req := &membersAPIActionLeader{}
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resp, body, err := m.client.Do(ctx, req)
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if err != nil {
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return nil, err
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}
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if err := assertStatusCode(resp.StatusCode, http.StatusOK); err != nil {
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return nil, err
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}
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var leader Member
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if err := json.Unmarshal(body, &leader); err != nil {
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return nil, err
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}
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return &leader, nil
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}
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type membersAPIActionList struct{}
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func (l *membersAPIActionList) HTTPRequest(ep url.URL) *http.Request {
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u := v2MembersURL(ep)
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req, _ := http.NewRequest("GET", u.String(), nil)
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return req
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}
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type membersAPIActionRemove struct {
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memberID string
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}
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func (d *membersAPIActionRemove) HTTPRequest(ep url.URL) *http.Request {
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u := v2MembersURL(ep)
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u.Path = path.Join(u.Path, d.memberID)
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req, _ := http.NewRequest("DELETE", u.String(), nil)
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return req
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}
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type membersAPIActionAdd struct {
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peerURLs types.URLs
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}
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func (a *membersAPIActionAdd) HTTPRequest(ep url.URL) *http.Request {
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u := v2MembersURL(ep)
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m := memberCreateOrUpdateRequest{PeerURLs: a.peerURLs}
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b, _ := json.Marshal(&m)
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req, _ := http.NewRequest("POST", u.String(), bytes.NewReader(b))
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req.Header.Set("Content-Type", "application/json")
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return req
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}
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type membersAPIActionUpdate struct {
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memberID string
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peerURLs types.URLs
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}
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func (a *membersAPIActionUpdate) HTTPRequest(ep url.URL) *http.Request {
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u := v2MembersURL(ep)
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m := memberCreateOrUpdateRequest{PeerURLs: a.peerURLs}
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u.Path = path.Join(u.Path, a.memberID)
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b, _ := json.Marshal(&m)
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req, _ := http.NewRequest("PUT", u.String(), bytes.NewReader(b))
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req.Header.Set("Content-Type", "application/json")
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return req
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}
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func assertStatusCode(got int, want ...int) (err error) {
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for _, w := range want {
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if w == got {
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return nil
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}
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}
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return fmt.Errorf("unexpected status code %d", got)
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}
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type membersAPIActionLeader struct{}
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func (l *membersAPIActionLeader) HTTPRequest(ep url.URL) *http.Request {
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u := v2MembersURL(ep)
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u.Path = path.Join(u.Path, defaultLeaderSuffix)
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req, _ := http.NewRequest("GET", u.String(), nil)
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return req
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}
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// v2MembersURL add the necessary path to the provided endpoint
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// to route requests to the default v2 members API.
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func v2MembersURL(ep url.URL) *url.URL {
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ep.Path = path.Join(ep.Path, defaultV2MembersPrefix)
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return &ep
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}
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type membersError struct {
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Message string `json:"message"`
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Code int `json:"-"`
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}
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func (e membersError) Error() string {
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return e.Message
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}
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