// Compress takes a slice of strings as argument
// and returns a compressed form.
func (*Erg) Compress(nodes []string) (result string) {
grangeResult := grange.NewResult()
for _, node := range nodes {
grangeResult.Add(node)
}
return grange.Compress(&grangeResult)
}
// Expand takes a range expression as argument
// and returns an slice of strings as result
// err is set to nil on success
func (e *Erg) Expand(query string) (result []string, err error) {
protocol := "http"
if e.ssl {
protocol = "https"
}
// TODO: Remove this with go 1.4
// http://stackoverflow.com/questions/25008571/golang-issue-x509-cannot-verify-signature-algorithm-unimplemented-on-net-http
tr := &http.Transport{
TLSClientConfig: &tls.Config{
MaxVersion: tls.VersionTLS11,
PreferServerCipherSuites: true,
},
}
client := &http.Client{Transport: tr}
resp, err := client.Get(fmt.Sprintf("%s://%s:%d/range/list?%s",
protocol,
e.host,
e.port,
url.QueryEscape(query),
))
if err != nil {
return nil, err
}
if resp.StatusCode != 200 {
body, readErr := ioutil.ReadAll(resp.Body)
if readErr != nil {
return nil, readErr
}
return nil, errors.New(string(body))
}
defer resp.Body.Close()
scanner := bufio.NewScanner(resp.Body)
grangeResult := grange.NewResult()
for scanner.Scan() {
grangeResult.Add(scanner.Text())
}
if grangeResult.Cardinality() > 0 {
for node := range grangeResult.Iter() {
result = append(result, node.(string))
}
if e.Sort {
sort.Sort(sortorder.Natural(result))
}
}
return result, nil
}