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requester.go
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/
requester.go
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package selfupdate
import (
"fmt"
"io"
"net/http"
)
// Requester interface allows developers to customize the method in which
// requests are made to retrieve the version and binary.
type Requester interface {
Fetch(url string) (io.ReadCloser, error)
}
// HTTPRequester is the normal requester that is used and does an HTTP
// to the URL location requested to retrieve the specified data.
type HTTPRequester struct{}
// Fetch will return an HTTP request to the specified url and return
// the body of the result. An error will occur for a non 200 status code.
func (httpRequester *HTTPRequester) Fetch(url string) (io.ReadCloser, error) {
resp, err := http.Get(url)
if err != nil {
return nil, err
}
if resp.StatusCode != 200 {
return nil, fmt.Errorf("bad http status from %s: %v", url, resp.Status)
}
return resp.Body, nil
}
// mockRequester used for some mock testing to ensure the requester contract
// works as specified.
type mockRequester struct {
currentIndex int
fetches []func(string) (io.ReadCloser, error)
}
func (mr *mockRequester) handleRequest(requestHandler func(string) (io.ReadCloser, error)) {
if mr.fetches == nil {
mr.fetches = []func(string) (io.ReadCloser, error){}
}
mr.fetches = append(mr.fetches, requestHandler)
}
func (mr *mockRequester) Fetch(url string) (io.ReadCloser, error) {
if len(mr.fetches) <= mr.currentIndex {
return nil, fmt.Errorf("no for currentIndex %d to mock", mr.currentIndex)
}
current := mr.fetches[mr.currentIndex]
mr.currentIndex++
return current(url)
}