/
http.go
83 lines (70 loc) · 2.25 KB
/
http.go
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// Copyright 2022 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package http
import (
"context"
"io"
"net/http"
"net/url"
"github.com/juju/errors"
"github.com/juju/juju/api/base"
)
// HTTPClient is an API-specific HTTP client.
type HTTPClient interface {
// Do sends the HTTP request, returning the subsequent response.
Do(req *http.Request) (*http.Response, error)
}
// HTTPDoer exposes the functionality of httprequest.Client needed here.
type HTTPDoer interface {
// Do sends the given request.
Do(context context.Context, req *http.Request, resp interface{}) error
}
// URIOpener provides the OpenURI method.
type URIOpener interface {
OpenURI(uri string, query url.Values) (io.ReadCloser, error)
}
type uriOpener struct {
ctx context.Context
httpClient HTTPDoer
}
// OpenURI performs a GET on a Juju HTTP endpoint returning the specified blob.
func (o *uriOpener) OpenURI(uri string, query url.Values) (io.ReadCloser, error) {
return OpenURI(o.ctx, o.httpClient, uri, query)
}
// NewURIOpener returns a URI opener for the api caller.
func NewURIOpener(apiConn base.APICaller) (URIOpener, error) {
httpClient, err := apiConn.HTTPClient()
if err != nil {
return nil, errors.Trace(err)
}
return &uriOpener{
ctx: apiConn.Context(),
httpClient: httpClient,
}, nil
}
// OpenURI performs a GET on a Juju HTTP endpoint returning the specified blob.
func OpenURI(ctx context.Context, httpClient HTTPDoer, uri string, query url.Values) (io.ReadCloser, error) {
blob, err := openBlobReader(ctx, httpClient, uri, query)
if err != nil {
return nil, errors.Trace(err)
}
return blob, nil
}
// openBlobReader streams the identified blob from the controller via the
// provided HTTP client.
func openBlobReader(ctx context.Context, httpClient HTTPDoer, endpoint string, args url.Values) (io.ReadCloser, error) {
apiURL, err := url.Parse(endpoint)
if err != nil {
return nil, errors.Trace(err)
}
apiURL.RawQuery = args.Encode()
req, err := http.NewRequest(http.MethodGet, apiURL.String(), nil)
if err != nil {
return nil, errors.Annotate(err, "cannot create HTTP request")
}
var resp *http.Response
if err := httpClient.Do(ctx, req, &resp); err != nil {
return nil, errors.Trace(err)
}
return resp.Body, nil
}