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sources.go
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sources.go
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package mstreamer
import (
"errors"
"io"
"io/ioutil"
"net/http"
)
// SourceAdapter takes
type SourceAdapter func(Feedback, io.Writer)
// SourceGetter takes
type SourceGetter func() (io.ReadCloser, error)
// NewBasicHTTPSource is a basic HTTP Source
func NewBasicHTTPSource(url, user, pwd string) (Source, error) {
return newBasicHTTPSource(url, user, pwd)
}
// NewGetterSource takes
func NewGetterSource(get SourceGetter) (Source, error) {
return newGetterSource(get, io.Copy)
}
// NewSource returns a NewSource component using a getter function as its input stream
func NewSource(adapter SourceAdapter) (Source, error) {
return newSource(adapter, io.Pipe)
}
func newSource(
adapter SourceAdapter,
ioPipe func() (*io.PipeReader, *io.PipeWriter),
) (Source, error) {
if adapter == nil {
return nil, errors.New("adapter is nil")
}
if ioPipe == nil {
return nil, errors.New("ioPipe is nil")
}
return func(f Feedback) (io.ReadCloser, error) {
if f == nil {
return nil, errors.New("feedback funcion is nil")
}
pr, pw := ioPipe()
go func() {
defer pw.Close()
adapter(f, pw)
}()
return pr, nil
}, nil
}
func newGetterSource(
get SourceGetter,
iocopy func(io.Writer, io.Reader) (int64, error),
) (Source, error) {
if get == nil {
return nil, errors.New("get function is nil")
}
if iocopy == nil {
return nil, errors.New("iocopy function is nil")
}
adapter := func(f Feedback, w io.Writer) {
r, err := get()
if err != nil {
f("error on retrieving reader %v", err)
return
}
if _, err := iocopy(w, r); err != nil {
f("error on writing %v", err)
}
}
return NewSource(adapter)
}
func newBasicHTTPSource(url, user, pwd string) (Source, error) {
get := func() (io.ReadCloser, error) {
client := &http.Client{}
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return nil, err
}
req.SetBasicAuth(user, pwd)
resp, err := client.Do(req)
if err != nil {
return nil, err
}
if resp.StatusCode != 200 {
body, _ := ioutil.ReadAll(resp.Body) // consumes all body before leaves
return nil, errors.New(resp.Status + ":" + string(body))
}
return resp.Body, nil
}
return NewGetterSource(get)
}