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request.go
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request.go
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package api
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"github.com/crypto-zero/go-micro/v2/logger"
)
// Request is used to construct a http request for the k8s API.
type Request struct {
// the request context
context context.Context
client *http.Client
header http.Header
params url.Values
method string
host string
namespace string
resource string
resourceName *string
subResource *string
body io.Reader
err error
}
// Params is the object to pass in to set parameters
// on a request.
type Params struct {
LabelSelector map[string]string
Annotations map[string]string
Additional map[string]string
}
// verb sets method
func (r *Request) verb(method string) *Request {
r.method = method
return r
}
func (r *Request) Context(ctx context.Context) {
r.context = ctx
}
// 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
func (r *Request) Patch() *Request {
return r.verb("PATCH")
}
// 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 {
if len(s) > 0 {
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
}
// SubResource sets a subresource on a resource,
// e.g. pods/log for pod logs
func (r *Request) SubResource(s string) *Request {
r.subResource = &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 we're not sending YAML request, we encode to JSON
if r.header.Get("Content-Type") != "application/yaml" {
if err := json.NewEncoder(b).Encode(&in); err != nil {
r.err = err
return r
}
r.body = b
return r
}
// if application/yaml is set, we assume we get a raw bytes so we just copy over
body, ok := in.(io.Reader)
if !ok {
r.err = errors.New("invalid data")
return r
}
// copy over data to the bytes buffer
if _, err := io.Copy(b, body); 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 {
// create new key=value pair
value := fmt.Sprintf("%s=%s", k, v)
// check if there's an existing value
if label := r.params.Get("labelSelector"); len(label) > 0 {
value = fmt.Sprintf("%s,%s", label, value)
}
// set and overwrite the value
r.params.Set("labelSelector", value)
}
for k, v := range p.Additional {
r.params.Set(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) {
var url string
switch r.resource {
case "namespace":
// /api/v1/namespaces/
url = fmt.Sprintf("%s/api/v1/namespaces/", r.host)
case "deployment":
// /apis/apps/v1/namespaces/{namespace}/deployments/{name}
url = fmt.Sprintf("%s/apis/apps/v1/namespaces/%s/%ss/", r.host, r.namespace, r.resource)
default:
// /api/v1/namespaces/{namespace}/{resource}
url = fmt.Sprintf("%s/api/v1/namespaces/%s/%ss/", r.host, r.namespace, r.resource)
}
// append resourceName if it is present
if r.resourceName != nil {
url += *r.resourceName
if r.subResource != nil {
url += "/" + *r.subResource
}
}
// append any query params
if len(r.params) > 0 {
url += "?" + r.params.Encode()
}
var req *http.Request
var err error
// build request
if r.context != nil {
req, err = http.NewRequestWithContext(r.context, r.method, url, r.body)
} else {
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,
}
}
logger.Debugf("[Kubernetes] %v %v", req.Method, req.URL.String())
res, err := r.client.Do(req)
if err != nil {
return &Response{
err: err,
}
}
// return res, err
return newResponse(res, err)
}
// Raw performs a Raw HTTP request to the Kubernetes API
func (r *Request) Raw() (*http.Response, error) {
req, err := r.request()
if err != nil {
return nil, err
}
res, err := r.client.Do(req)
if err != nil {
return nil, err
}
return res, nil
}
// 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
}