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requests.go
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requests.go
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package nodes
import (
"errors"
"fmt"
"github.com/rackspace/gophercloud"
"github.com/rackspace/gophercloud/pagination"
)
// List is the operation responsible for returning a paginated collection of
// load balancer nodes. It requires the node ID, its parent load balancer ID,
// and optional limit integer (passed in either as a pointer or a nil poitner).
func List(client *gophercloud.ServiceClient, loadBalancerID int, limit *int) pagination.Pager {
url := rootURL(client, loadBalancerID)
if limit != nil {
url += fmt.Sprintf("?limit=%d", limit)
}
return pagination.NewPager(client, url, func(r pagination.PageResult) pagination.Page {
return NodePage{pagination.SinglePageBase(r)}
})
}
// CreateOptsBuilder is the interface responsible for generating the JSON
// for a Create operation.
type CreateOptsBuilder interface {
ToNodeCreateMap() (map[string]interface{}, error)
}
// CreateOpts is a slice of CreateOpt structs, that allow the user to create
// multiple nodes in a single operation (one node per CreateOpt).
type CreateOpts []CreateOpt
// CreateOpt represents the options to create a single node.
type CreateOpt struct {
// Required - the IP address or CIDR for this back-end node. It can either be
// a private IP (ServiceNet) or a public IP.
Address string
// Optional - the port on which traffic is sent and received.
Port int
// Optional - the condition of the node. See the consts in Results.go.
Condition Condition
// Optional - the type of the node. See the consts in Results.go.
Type Type
// Optional - a pointer to an integer between 0 and 100.
Weight *int
}
func validateWeight(weight *int) error {
if weight != nil && (*weight > 100 || *weight < 0) {
return errors.New("Weight must be a valid int between 0 and 100")
}
return nil
}
// ToNodeCreateMap converts a slice of options into a map that can be used for
// the JSON.
func (opts CreateOpts) ToNodeCreateMap() (map[string]interface{}, error) {
type nodeMap map[string]interface{}
nodes := []nodeMap{}
for k, v := range opts {
if v.Address == "" {
return nodeMap{}, fmt.Errorf("ID is a required attribute, none provided for %d CreateOpt element", k)
}
if weightErr := validateWeight(v.Weight); weightErr != nil {
return nodeMap{}, weightErr
}
node := make(map[string]interface{})
node["address"] = v.Address
if v.Port > 0 {
node["port"] = v.Port
}
if v.Condition != "" {
node["condition"] = v.Condition
}
if v.Type != "" {
node["type"] = v.Type
}
if v.Weight != nil {
node["weight"] = &v.Weight
}
nodes = append(nodes, node)
}
return nodeMap{"nodes": nodes}, nil
}
// Create is the operation responsible for creating a new node on a load
// balancer. Since every load balancer exists in both ServiceNet and the public
// Internet, both private and public IP addresses can be used for nodes.
//
// If nodes need time to boot up services before they become operational, you
// can temporarily prevent traffic from being sent to that node by setting the
// Condition field to DRAINING. Health checks will still be performed; but once
// your node is ready, you can update its condition to ENABLED and have it
// handle traffic.
func Create(client *gophercloud.ServiceClient, loadBalancerID int, opts CreateOptsBuilder) CreateResult {
var res CreateResult
reqBody, err := opts.ToNodeCreateMap()
if err != nil {
res.Err = err
return res
}
resp, err := client.Post(rootURL(client, loadBalancerID), reqBody, &res.Body, nil)
if err != nil {
res.Err = err
return res
}
pr := pagination.PageResultFromParsed(resp, res.Body)
return CreateResult{pagination.SinglePageBase(pr)}
}
// BulkDelete is the operation responsible for batch deleting multiple nodes in
// a single operation. It accepts a slice of integer IDs and will remove them
// from the load balancer. The maximum limit is 10 node removals at once.
func BulkDelete(c *gophercloud.ServiceClient, loadBalancerID int, nodeIDs []int) DeleteResult {
var res DeleteResult
if len(nodeIDs) > 10 || len(nodeIDs) == 0 {
res.Err = errors.New("You must provide a minimum of 1 and a maximum of 10 node IDs")
return res
}
url := rootURL(c, loadBalancerID)
url += gophercloud.IDSliceToQueryString("id", nodeIDs)
_, res.Err = c.Delete(url, nil)
return res
}
// Get is the operation responsible for showing details for a single node.
func Get(c *gophercloud.ServiceClient, lbID, nodeID int) GetResult {
var res GetResult
_, res.Err = c.Get(resourceURL(c, lbID, nodeID), &res.Body, nil)
return res
}
// UpdateOptsBuilder represents a type that can be converted into a JSON-like
// map structure.
type UpdateOptsBuilder interface {
ToNodeUpdateMap() (map[string]interface{}, error)
}
// UpdateOpts represent the options for updating an existing node.
type UpdateOpts struct {
// Optional - the condition of the node. See the consts in Results.go.
Condition Condition
// Optional - the type of the node. See the consts in Results.go.
Type Type
// Optional - a pointer to an integer between 0 and 100.
Weight *int
}
// ToNodeUpdateMap converts an options struct into a JSON-like map.
func (opts UpdateOpts) ToNodeUpdateMap() (map[string]interface{}, error) {
node := make(map[string]interface{})
if opts.Condition != "" {
node["condition"] = opts.Condition
}
if opts.Weight != nil {
if weightErr := validateWeight(opts.Weight); weightErr != nil {
return node, weightErr
}
node["weight"] = &opts.Weight
}
if opts.Type != "" {
node["type"] = opts.Type
}
return map[string]interface{}{"node": node}, nil
}
// Update is the operation responsible for updating an existing node. A node's
// IP, port, and status are immutable attributes and cannot be modified.
func Update(c *gophercloud.ServiceClient, lbID, nodeID int, opts UpdateOptsBuilder) UpdateResult {
var res UpdateResult
reqBody, err := opts.ToNodeUpdateMap()
if err != nil {
res.Err = err
return res
}
_, res.Err = c.Put(resourceURL(c, lbID, nodeID), reqBody, nil, nil)
return res
}
// Delete is the operation responsible for permanently deleting a node.
func Delete(c *gophercloud.ServiceClient, lbID, nodeID int) DeleteResult {
var res DeleteResult
_, res.Err = c.Delete(resourceURL(c, lbID, nodeID), nil)
return res
}
// ListEventsOptsBuilder allows extensions to add additional parameters to the
// List request.
type ListEventsOptsBuilder interface {
ToEventsListQuery() (string, error)
}
// ListEventsOpts allows the filtering and sorting of paginated collections through
// the API.
type ListEventsOpts struct {
Marker string `q:"marker"`
Limit int `q:"limit"`
}
// ToEventsListQuery formats a ListOpts into a query string.
func (opts ListEventsOpts) ToEventsListQuery() (string, error) {
q, err := gophercloud.BuildQueryString(opts)
if err != nil {
return "", err
}
return q.String(), nil
}
// ListEvents is the operation responsible for listing all the events
// associated with the activity between the node and the load balancer. The
// events report errors found with the node. The detailedMessage provides the
// detailed reason for the error.
func ListEvents(client *gophercloud.ServiceClient, loadBalancerID int, opts ListEventsOptsBuilder) pagination.Pager {
url := eventsURL(client, loadBalancerID)
if opts != nil {
query, err := opts.ToEventsListQuery()
if err != nil {
return pagination.Pager{Err: err}
}
url += query
}
return pagination.NewPager(client, url, func(r pagination.PageResult) pagination.Page {
return NodeEventPage{pagination.SinglePageBase(r)}
})
}