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request.go
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request.go
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package okapi
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
)
// request abstracts an http.Request
type request struct {
// config is used to inject client config options into the request struct
config *Config
// method is the HTTP request method
method string
// url is the query endpoint
url *url.URL
// params maps a string key to a list of values. It is used for query
// parameters and form values. Unlike in the http.Header map, the keys in a
// url.Values map are case-sensitive.
params url.Values
// body is the request body formatted as an io.Reader
body io.Reader
// obj is a body alternative. If provided and body is left empty, this object
// will be json encoded and used as the request.Body
obj interface{}
// ctx is passed to http.NewRequestWithContext. Defaults to context.Background
ctx context.Context
}
// withQueryOptions unpacks QueryOptions into the request object.
func (r *request) withQueryOptions(q *QueryOptions) *request {
if q == nil {
return r
}
if q.WaitTime != 0 {
r.params.Set("wait", q.WaitTime.String())
}
for k, v := range q.Params {
r.params.Set(k, v)
}
r.ctx = q.Context()
r.obj = q.Obj
return r
}
// toHTTP converts our request abstraction to an actual http.Request.
func (r *request) toHTTP() (*http.Request, error) {
r.url.RawQuery = r.params.Encode()
// encode the obj as the request body if applicable.
if r.body == nil && r.obj != nil {
if b, err := encodeBody(r.obj); err != nil {
return nil, err
} else {
r.body = b
}
}
if r.ctx == nil {
r.ctx = context.Background()
}
req, err := http.NewRequestWithContext(r.ctx, r.method, r.url.RequestURI(), r.body)
if err != nil {
return nil, err
}
req.URL.Host = r.url.Host
req.URL.Scheme = r.url.Scheme
req.Host = r.url.Host
return req, nil
}
// decodeBody unmarshals the response body into the provided interface. It
// raises an error if the response body is empty and the provided interface is
// not nil.
func decodeBody(resp *http.Response, out interface{}) error {
switch resp.ContentLength {
case 0:
if out == nil {
return nil
}
return fmt.Errorf("Got 0 byte response with non-nil decode object")
default:
dec := json.NewDecoder(resp.Body)
return dec.Decode(out)
}
}
// encodeBody marshals the provided interface to an io.Reader.
func encodeBody(obj interface{}) (io.Reader, error) {
if reader, ok := obj.(io.Reader); ok {
return reader, nil
}
buf := bytes.NewBuffer(nil)
enc := json.NewEncoder(buf)
if err := enc.Encode(obj); err != nil {
return nil, err
}
return buf, nil
}