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request.go 3.95 KB
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package api
import (
"bytes"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"github.com/micro/go-plugins/registry/kubernetes/client/watch"
)
// Request is used to construct a http request for the k8s API.
type Request struct {
client *http.Client
header http.Header
params url.Values
method string
host string
namespace string
resource string
resourceName *string
body io.Reader
err error
}
// Params is the object to pass in to set paramaters
// on a request.
type Params struct {
LabelSelector map[string]string
Watch bool
}
// verb sets method
func (r *Request) verb(method string) *Request {
r.method = method
return r
}
// Get request
func (r *Request) Get() *Request {
return r.verb("GET")
}
// Post request
func (r *Request) Post() *Request {
return r.verb("POST")
}
// Put request
func (r *Request) Put() *Request {
return r.verb("PUT")
}
// Patch request
// https://github.com/kubernetes/kubernetes/blob/master/docs/devel/api-conventions.md#patch-operations
func (r *Request) Patch() *Request {
return r.verb("PATCH").SetHeader("Content-Type", "application/strategic-merge-patch+json")
}
// Delete request
func (r *Request) Delete() *Request {
return r.verb("DELETE")
}
// Namespace is to set the namespace to operate on
func (r *Request) Namespace(s string) *Request {
r.namespace = s
return r
}
// Resource is the type of resource the operation is
// for, such as "services", "endpoints" or "pods"
func (r *Request) Resource(s string) *Request {
r.resource = s
return r
}
// Name is for targeting a specific resource by id
func (r *Request) Name(s string) *Request {
r.resourceName = &s
return r
}
// Body pass in a body to set, this is for POST, PUT
// and PATCH requests
func (r *Request) Body(in interface{}) *Request {
b := new(bytes.Buffer)
if err := json.NewEncoder(b).Encode(&in); err != nil {
r.err = err
return r
}
r.body = b
return r
}
// Params isused to set paramters on a request
func (r *Request) Params(p *Params) *Request {
for k, v := range p.LabelSelector {
r.params.Add("labelSelectors", k+"="+v)
}
return r
}
// SetHeader sets a header on a request with
// a `key` and `value`
func (r *Request) SetHeader(key, value string) *Request {
r.header.Add(key, value)
return r
}
// request builds the http.Request from the options
func (r *Request) request() (*http.Request, error) {
url := fmt.Sprintf("%s/api/v1/namespaces/%s/%s/", r.host, r.namespace, r.resource)
// append resourceName if it is present
if r.resourceName != nil {
url += *r.resourceName
}
// append any query params
if len(r.params) > 0 {
url += "?" + r.params.Encode()
}
// build request
req, err := http.NewRequest(r.method, url, r.body)
if err != nil {
return nil, err
}
// set headers on request
req.Header = r.header
return req, nil
}
// Do builds and triggers the request
func (r *Request) Do() *Response {
if r.err != nil {
return &Response{
err: r.err,
}
}
req, err := r.request()
if err != nil {
return &Response{
err: err,
}
}
res, err := r.client.Do(req)
if err != nil {
return &Response{
err: err,
}
}
// return res, err
return newResponse(res, err)
}
// Watch builds and triggers the request, but
// will watch instead of return an object
func (r *Request) Watch() (watch.Watch, error) {
if r.err != nil {
return nil, r.err
}
r.params.Set("watch", "true")
req, err := r.request()
if err != nil {
return nil, err
}
w, err := watch.NewBodyWatcher(req, r.client)
return w, err
}
// Options ...
type Options struct {
Host string
Namespace string
BearerToken *string
Client *http.Client
}
// NewRequest creates a k8s api request
func NewRequest(opts *Options) *Request {
req := &Request{
header: make(http.Header),
params: make(url.Values),
client: opts.Client,
namespace: opts.Namespace,
host: opts.Host,
}
if opts.BearerToken != nil {
req.SetHeader("Authorization", "Bearer "+*opts.BearerToken)
}
return req
}

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