prometheus/vendor/github.com/digitalocean/godo/load_balancers.go
Julien Pivotto c61141ce51
Add DigitalOcean service discovery (#7407)
Signed-off-by: Julien Pivotto <roidelapluie@inuits.eu>
2020-06-18 17:04:41 +02:00

325 lines
11 KiB
Go

package godo
import (
"context"
"fmt"
"net/http"
)
const loadBalancersBasePath = "/v2/load_balancers"
const forwardingRulesPath = "forwarding_rules"
const dropletsPath = "droplets"
// LoadBalancersService is an interface for managing load balancers with the DigitalOcean API.
// See: https://developers.digitalocean.com/documentation/v2#load-balancers
type LoadBalancersService interface {
Get(context.Context, string) (*LoadBalancer, *Response, error)
List(context.Context, *ListOptions) ([]LoadBalancer, *Response, error)
Create(context.Context, *LoadBalancerRequest) (*LoadBalancer, *Response, error)
Update(ctx context.Context, lbID string, lbr *LoadBalancerRequest) (*LoadBalancer, *Response, error)
Delete(ctx context.Context, lbID string) (*Response, error)
AddDroplets(ctx context.Context, lbID string, dropletIDs ...int) (*Response, error)
RemoveDroplets(ctx context.Context, lbID string, dropletIDs ...int) (*Response, error)
AddForwardingRules(ctx context.Context, lbID string, rules ...ForwardingRule) (*Response, error)
RemoveForwardingRules(ctx context.Context, lbID string, rules ...ForwardingRule) (*Response, error)
}
// LoadBalancer represents a DigitalOcean load balancer configuration.
// Tags can only be provided upon the creation of a Load Balancer.
type LoadBalancer struct {
ID string `json:"id,omitempty"`
Name string `json:"name,omitempty"`
IP string `json:"ip,omitempty"`
Algorithm string `json:"algorithm,omitempty"`
Status string `json:"status,omitempty"`
Created string `json:"created_at,omitempty"`
ForwardingRules []ForwardingRule `json:"forwarding_rules,omitempty"`
HealthCheck *HealthCheck `json:"health_check,omitempty"`
StickySessions *StickySessions `json:"sticky_sessions,omitempty"`
Region *Region `json:"region,omitempty"`
DropletIDs []int `json:"droplet_ids,omitempty"`
Tag string `json:"tag,omitempty"`
Tags []string `json:"tags,omitempty"`
RedirectHttpToHttps bool `json:"redirect_http_to_https,omitempty"`
EnableProxyProtocol bool `json:"enable_proxy_protocol,omitempty"`
EnableBackendKeepalive bool `json:"enable_backend_keepalive,omitempty"`
VPCUUID string `json:"vpc_uuid,omitempty"`
}
// String creates a human-readable description of a LoadBalancer.
func (l LoadBalancer) String() string {
return Stringify(l)
}
func (l LoadBalancer) URN() string {
return ToURN("LoadBalancer", l.ID)
}
// AsRequest creates a LoadBalancerRequest that can be submitted to Update with the current values of the LoadBalancer.
// Modifying the returned LoadBalancerRequest will not modify the original LoadBalancer.
func (l LoadBalancer) AsRequest() *LoadBalancerRequest {
r := LoadBalancerRequest{
Name: l.Name,
Algorithm: l.Algorithm,
ForwardingRules: append([]ForwardingRule(nil), l.ForwardingRules...),
DropletIDs: append([]int(nil), l.DropletIDs...),
Tag: l.Tag,
RedirectHttpToHttps: l.RedirectHttpToHttps,
EnableProxyProtocol: l.EnableProxyProtocol,
EnableBackendKeepalive: l.EnableBackendKeepalive,
HealthCheck: l.HealthCheck,
VPCUUID: l.VPCUUID,
}
if l.HealthCheck != nil {
r.HealthCheck = &HealthCheck{}
*r.HealthCheck = *l.HealthCheck
}
if l.StickySessions != nil {
r.StickySessions = &StickySessions{}
*r.StickySessions = *l.StickySessions
}
if l.Region != nil {
r.Region = l.Region.Slug
}
return &r
}
// ForwardingRule represents load balancer forwarding rules.
type ForwardingRule struct {
EntryProtocol string `json:"entry_protocol,omitempty"`
EntryPort int `json:"entry_port,omitempty"`
TargetProtocol string `json:"target_protocol,omitempty"`
TargetPort int `json:"target_port,omitempty"`
CertificateID string `json:"certificate_id,omitempty"`
TlsPassthrough bool `json:"tls_passthrough,omitempty"`
}
// String creates a human-readable description of a ForwardingRule.
func (f ForwardingRule) String() string {
return Stringify(f)
}
// HealthCheck represents optional load balancer health check rules.
type HealthCheck struct {
Protocol string `json:"protocol,omitempty"`
Port int `json:"port,omitempty"`
Path string `json:"path,omitempty"`
CheckIntervalSeconds int `json:"check_interval_seconds,omitempty"`
ResponseTimeoutSeconds int `json:"response_timeout_seconds,omitempty"`
HealthyThreshold int `json:"healthy_threshold,omitempty"`
UnhealthyThreshold int `json:"unhealthy_threshold,omitempty"`
}
// String creates a human-readable description of a HealthCheck.
func (h HealthCheck) String() string {
return Stringify(h)
}
// StickySessions represents optional load balancer session affinity rules.
type StickySessions struct {
Type string `json:"type,omitempty"`
CookieName string `json:"cookie_name,omitempty"`
CookieTtlSeconds int `json:"cookie_ttl_seconds,omitempty"`
}
// String creates a human-readable description of a StickySessions instance.
func (s StickySessions) String() string {
return Stringify(s)
}
// LoadBalancerRequest represents the configuration to be applied to an existing or a new load balancer.
type LoadBalancerRequest struct {
Name string `json:"name,omitempty"`
Algorithm string `json:"algorithm,omitempty"`
Region string `json:"region,omitempty"`
ForwardingRules []ForwardingRule `json:"forwarding_rules,omitempty"`
HealthCheck *HealthCheck `json:"health_check,omitempty"`
StickySessions *StickySessions `json:"sticky_sessions,omitempty"`
DropletIDs []int `json:"droplet_ids,omitempty"`
Tag string `json:"tag,omitempty"`
Tags []string `json:"tags,omitempty"`
RedirectHttpToHttps bool `json:"redirect_http_to_https,omitempty"`
EnableProxyProtocol bool `json:"enable_proxy_protocol,omitempty"`
EnableBackendKeepalive bool `json:"enable_backend_keepalive,omitempty"`
VPCUUID string `json:"vpc_uuid,omitempty"`
}
// String creates a human-readable description of a LoadBalancerRequest.
func (l LoadBalancerRequest) String() string {
return Stringify(l)
}
type forwardingRulesRequest struct {
Rules []ForwardingRule `json:"forwarding_rules,omitempty"`
}
func (l forwardingRulesRequest) String() string {
return Stringify(l)
}
type dropletIDsRequest struct {
IDs []int `json:"droplet_ids,omitempty"`
}
func (l dropletIDsRequest) String() string {
return Stringify(l)
}
type loadBalancersRoot struct {
LoadBalancers []LoadBalancer `json:"load_balancers"`
Links *Links `json:"links"`
Meta *Meta `json:"meta"`
}
type loadBalancerRoot struct {
LoadBalancer *LoadBalancer `json:"load_balancer"`
}
// LoadBalancersServiceOp handles communication with load balancer-related methods of the DigitalOcean API.
type LoadBalancersServiceOp struct {
client *Client
}
var _ LoadBalancersService = &LoadBalancersServiceOp{}
// Get an existing load balancer by its identifier.
func (l *LoadBalancersServiceOp) Get(ctx context.Context, lbID string) (*LoadBalancer, *Response, error) {
path := fmt.Sprintf("%s/%s", loadBalancersBasePath, lbID)
req, err := l.client.NewRequest(ctx, http.MethodGet, path, nil)
if err != nil {
return nil, nil, err
}
root := new(loadBalancerRoot)
resp, err := l.client.Do(ctx, req, root)
if err != nil {
return nil, resp, err
}
return root.LoadBalancer, resp, err
}
// List load balancers, with optional pagination.
func (l *LoadBalancersServiceOp) List(ctx context.Context, opt *ListOptions) ([]LoadBalancer, *Response, error) {
path, err := addOptions(loadBalancersBasePath, opt)
if err != nil {
return nil, nil, err
}
req, err := l.client.NewRequest(ctx, http.MethodGet, path, nil)
if err != nil {
return nil, nil, err
}
root := new(loadBalancersRoot)
resp, err := l.client.Do(ctx, req, root)
if err != nil {
return nil, resp, err
}
if l := root.Links; l != nil {
resp.Links = l
}
if m := root.Meta; m != nil {
resp.Meta = m
}
return root.LoadBalancers, resp, err
}
// Create a new load balancer with a given configuration.
func (l *LoadBalancersServiceOp) Create(ctx context.Context, lbr *LoadBalancerRequest) (*LoadBalancer, *Response, error) {
req, err := l.client.NewRequest(ctx, http.MethodPost, loadBalancersBasePath, lbr)
if err != nil {
return nil, nil, err
}
root := new(loadBalancerRoot)
resp, err := l.client.Do(ctx, req, root)
if err != nil {
return nil, resp, err
}
return root.LoadBalancer, resp, err
}
// Update an existing load balancer with new configuration.
func (l *LoadBalancersServiceOp) Update(ctx context.Context, lbID string, lbr *LoadBalancerRequest) (*LoadBalancer, *Response, error) {
path := fmt.Sprintf("%s/%s", loadBalancersBasePath, lbID)
req, err := l.client.NewRequest(ctx, "PUT", path, lbr)
if err != nil {
return nil, nil, err
}
root := new(loadBalancerRoot)
resp, err := l.client.Do(ctx, req, root)
if err != nil {
return nil, resp, err
}
return root.LoadBalancer, resp, err
}
// Delete a load balancer by its identifier.
func (l *LoadBalancersServiceOp) Delete(ctx context.Context, ldID string) (*Response, error) {
path := fmt.Sprintf("%s/%s", loadBalancersBasePath, ldID)
req, err := l.client.NewRequest(ctx, http.MethodDelete, path, nil)
if err != nil {
return nil, err
}
return l.client.Do(ctx, req, nil)
}
// AddDroplets adds droplets to a load balancer.
func (l *LoadBalancersServiceOp) AddDroplets(ctx context.Context, lbID string, dropletIDs ...int) (*Response, error) {
path := fmt.Sprintf("%s/%s/%s", loadBalancersBasePath, lbID, dropletsPath)
req, err := l.client.NewRequest(ctx, http.MethodPost, path, &dropletIDsRequest{IDs: dropletIDs})
if err != nil {
return nil, err
}
return l.client.Do(ctx, req, nil)
}
// RemoveDroplets removes droplets from a load balancer.
func (l *LoadBalancersServiceOp) RemoveDroplets(ctx context.Context, lbID string, dropletIDs ...int) (*Response, error) {
path := fmt.Sprintf("%s/%s/%s", loadBalancersBasePath, lbID, dropletsPath)
req, err := l.client.NewRequest(ctx, http.MethodDelete, path, &dropletIDsRequest{IDs: dropletIDs})
if err != nil {
return nil, err
}
return l.client.Do(ctx, req, nil)
}
// AddForwardingRules adds forwarding rules to a load balancer.
func (l *LoadBalancersServiceOp) AddForwardingRules(ctx context.Context, lbID string, rules ...ForwardingRule) (*Response, error) {
path := fmt.Sprintf("%s/%s/%s", loadBalancersBasePath, lbID, forwardingRulesPath)
req, err := l.client.NewRequest(ctx, http.MethodPost, path, &forwardingRulesRequest{Rules: rules})
if err != nil {
return nil, err
}
return l.client.Do(ctx, req, nil)
}
// RemoveForwardingRules removes forwarding rules from a load balancer.
func (l *LoadBalancersServiceOp) RemoveForwardingRules(ctx context.Context, lbID string, rules ...ForwardingRule) (*Response, error) {
path := fmt.Sprintf("%s/%s/%s", loadBalancersBasePath, lbID, forwardingRulesPath)
req, err := l.client.NewRequest(ctx, http.MethodDelete, path, &forwardingRulesRequest{Rules: rules})
if err != nil {
return nil, err
}
return l.client.Do(ctx, req, nil)
}