traefik/vendor/github.com/rancher/go-rancher-metadata/metadata/metadata.go

313 lines
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2019-04-05 10:22:04 +00:00
package metadata
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"time"
)
type Client interface {
OnChangeWithError(int, func(string)) error
OnChange(int, func(string))
OnChangeCtx(context.Context, int, func(string))
SendRequest(string) ([]byte, error)
GetVersion() (string, error)
GetSelfHost() (Host, error)
GetSelfContainer() (Container, error)
GetSelfServiceByName(string) (Service, error)
GetSelfService() (Service, error)
GetSelfStack() (Stack, error)
GetServices() ([]Service, error)
GetStacks() ([]Stack, error)
GetStackByName(string) (Stack, error)
GetContainers() ([]Container, error)
GetServiceContainers(string, string) ([]Container, error)
GetHosts() ([]Host, error)
GetHost(string) (Host, error)
GetNetworks() ([]Network, error)
}
type client struct {
url string
ip string
client *http.Client
}
func newClient(url, ip string) *client {
return &client{url, ip, &http.Client{Timeout: 10 * time.Second}}
}
func NewClient(url string) Client {
ip := ""
return newClient(url, ip)
}
func NewClientWithIPAndWait(url, ip string) (Client, error) {
client := newClient(url, ip)
if err := testConnection(client); err != nil {
return nil, err
}
return client, nil
}
func NewClientAndWait(url string) (Client, error) {
ip := ""
client := newClient(url, ip)
if err := testConnection(client); err != nil {
return nil, err
}
return client, nil
}
func (m *client) SendRequest(path string) ([]byte, error) {
req, err := http.NewRequest("GET", m.url+path, nil)
if err != nil {
return nil, err
}
req.Header.Add("Accept", "application/json")
if m.ip != "" {
req.Header.Add("X-Forwarded-For", m.ip)
}
resp, err := m.client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return nil, fmt.Errorf("Error %v accessing %v path", resp.StatusCode, path)
}
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
return body, nil
}
func (m *client) SendRequestCtx(ctx context.Context, path string) ([]byte, error) {
req, err := http.NewRequest("GET", m.url+path, nil)
if err != nil {
return nil, err
}
req.Header.Add("Accept", "application/json")
if m.ip != "" {
req.Header.Add("X-Forwarded-For", m.ip)
}
resp, err := m.client.Do(req.WithContext(ctx))
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return nil, fmt.Errorf("error %v accessing %v path", resp.StatusCode, path)
}
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
return body, nil
}
func (m *client) GetVersion() (string, error) {
resp, err := m.SendRequest("/version")
if err != nil {
return "", err
}
return string(resp[:]), nil
}
func (m *client) GetSelfHost() (Host, error) {
resp, err := m.SendRequest("/self/host")
var host Host
if err != nil {
return host, err
}
if err = json.Unmarshal(resp, &host); err != nil {
return host, err
}
return host, nil
}
func (m *client) GetSelfContainer() (Container, error) {
resp, err := m.SendRequest("/self/container")
var container Container
if err != nil {
return container, err
}
if err = json.Unmarshal(resp, &container); err != nil {
return container, err
}
return container, nil
}
func (m *client) GetSelfServiceByName(name string) (Service, error) {
resp, err := m.SendRequest("/self/stack/services/" + name)
var service Service
if err != nil {
return service, err
}
if err = json.Unmarshal(resp, &service); err != nil {
return service, err
}
return service, nil
}
func (m *client) GetSelfService() (Service, error) {
resp, err := m.SendRequest("/self/service")
var service Service
if err != nil {
return service, err
}
if err = json.Unmarshal(resp, &service); err != nil {
return service, err
}
return service, nil
}
func (m *client) GetSelfStack() (Stack, error) {
resp, err := m.SendRequest("/self/stack")
var stack Stack
if err != nil {
return stack, err
}
if err = json.Unmarshal(resp, &stack); err != nil {
return stack, err
}
return stack, nil
}
func (m *client) GetServices() ([]Service, error) {
resp, err := m.SendRequest("/services")
var services []Service
if err != nil {
return services, err
}
if err = json.Unmarshal(resp, &services); err != nil {
return services, err
}
return services, nil
}
func (m *client) GetStacks() ([]Stack, error) {
resp, err := m.SendRequest("/stacks")
var stacks []Stack
if err != nil {
return stacks, err
}
if err = json.Unmarshal(resp, &stacks); err != nil {
return stacks, err
}
return stacks, nil
}
func (m *client) GetStackByName(name string) (Stack, error) {
resp, err := m.SendRequest("/stacks/" + name)
var stack Stack
if err != nil {
return stack, err
}
if err = json.Unmarshal(resp, &stack); err != nil {
return stack, err
}
return stack, nil
}
func (m *client) GetContainers() ([]Container, error) {
resp, err := m.SendRequest("/containers")
var containers []Container
if err != nil {
return containers, err
}
if err = json.Unmarshal(resp, &containers); err != nil {
return containers, err
}
return containers, nil
}
func (m *client) GetServiceContainers(serviceName string, stackName string) ([]Container, error) {
var serviceContainers = []Container{}
containers, err := m.GetContainers()
if err != nil {
return serviceContainers, err
}
for _, container := range containers {
if container.StackName == stackName && container.ServiceName == serviceName {
serviceContainers = append(serviceContainers, container)
}
}
return serviceContainers, nil
}
func (m *client) GetHosts() ([]Host, error) {
resp, err := m.SendRequest("/hosts")
var hosts []Host
if err != nil {
return hosts, err
}
if err = json.Unmarshal(resp, &hosts); err != nil {
return hosts, err
}
return hosts, nil
}
func (m *client) GetHost(UUID string) (Host, error) {
var host Host
hosts, err := m.GetHosts()
if err != nil {
return host, err
}
for _, host := range hosts {
if host.UUID == UUID {
return host, nil
}
}
return host, fmt.Errorf("could not find host by UUID %v", UUID)
}
func (m *client) GetNetworks() ([]Network, error) {
resp, err := m.SendRequest("/networks")
var networks []Network
if err != nil {
return networks, err
}
if err = json.Unmarshal(resp, &networks); err != nil {
return networks, err
}
return networks, nil
}