/
preset.go
272 lines (237 loc) · 6.54 KB
/
preset.go
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package fetcher
import (
"io"
"net/http"
"net/url"
"path"
)
//Preset fetch preset.
type Preset struct {
prev *Preset
command Command
}
//Exec exec command to modify fetcher.
//Return any error if raised.
func (p *Preset) Exec(f *Fetcher) error {
if p == nil {
return nil
}
err := p.prev.Exec(f)
if err != nil {
return err
}
return p.command.Exec(f)
}
// CloneWith clone preset with commands.
// Alias for Concat
func (p *Preset) CloneWith(cmds ...Command) *Preset {
return p.Concat(cmds...)
}
// With clone preset with commands.
// Alias for Concat
func (p *Preset) With(cmds ...Command) *Preset {
return p.Concat(cmds...)
}
func (p *Preset) concatCommand(cmd Command) *Preset {
return &Preset{
prev: p,
command: cmd,
}
}
//Concat concat preset with given commands
func (p *Preset) Concat(cmds ...Command) *Preset {
preset := p
for _, v := range cmds {
preset = preset.concatCommand(v)
}
return preset
}
func (p *Preset) appendPreset(preset *Preset) *Preset {
if preset == nil {
return p
}
newpreset := p.appendPreset(preset.prev)
return &Preset{
prev: newpreset,
command: preset.command,
}
}
//Append clone and append preset with given presets in order.
func (p *Preset) Append(presets ...*Preset) *Preset {
preset := p
for _, v := range presets {
preset = preset.appendPreset(v)
}
return preset
}
//Commands return preset commands.
func (p *Preset) Commands() []Command {
if p == nil {
return []Command{}
}
cmds := p.prev.Commands()
cmds = append(cmds, p.command)
return cmds
}
//EndPoint create new preset with given suffix and method.
func (p *Preset) EndPoint(method string, suffix string) *Preset {
return p.Concat(PathSuffix(suffix), Method(method))
}
//Fetch fetch request.
//Preset and commands will exec on new fetcher by which fetching response.
//Return http response and any error if raised.
//Response returned will be parsed by defualt parser.
func (p *Preset) Fetch(cmds ...Command) (*Response, error) {
return Fetch(p.Concat(cmds...))
}
//FetchWithBody fetch request with given body.
//Return http response and any error if raised.
//Response returned will be parsed by defualt parser.
func (p *Preset) FetchWithBody(body io.Reader) (*Response, error) {
return p.Fetch(Body(body))
}
//FetchAndParse fetch request and prase response with given parser if no error raised.
//Return response fetched and any error raised when fetching or parsing.
//Response returned will be parsed by given parser or defualt parser if nill given.
func (p *Preset) FetchAndParse(parser Parser) (*Response, error) {
return FetchAndParse(p, parser)
}
//FetchWithBodyAndParse fetch request and prase response with given parser ,body and parser if no error raised.
//Return response fetched and any error raised when fetching or parsing.
//Response returned will be parsed by given parser or defualt parser if nill given.
func (p *Preset) FetchWithBodyAndParse(body io.Reader, parser Parser) (*Response, error) {
return FetchWithBodyAndParse(p, body, parser)
}
//FetchWithJSONBodyAndParse fetch request and prase response with given parser ,body as json and parser if no error raised.
//Return response fetched and any error raised when fetching or parsing.
//Response returned will be parsed by given parser or defualt parser if nill given.
func (p *Preset) FetchWithJSONBodyAndParse(body interface{}, parser Parser) (*Response, error) {
return FetchAndParse(p.Concat(JSONBody(body)), parser)
}
//NewPreset create new preset
func NewPreset() *Preset {
return nil
}
//Concat create preset with given commands.
func Concat(cmds ...Command) *Preset {
return NewPreset().Concat(cmds...)
}
//BuildPreset build new preset with given commands
func BuildPreset(cmds ...Command) *Preset {
return NewPreset().Concat(cmds...)
}
//ServerInfo server info struct
type ServerInfo struct {
//URL server host url
URL string
//Header http header
Header http.Header
//Method http method
Method string
}
//MergeMethod clone and merge with given method
func (s *ServerInfo) MergeMethod(method string) *ServerInfo {
si := s.Clone()
si.Method = method
return si
}
//MergeURL clone and merge with given url
func (s *ServerInfo) MergeURL(url string) *ServerInfo {
si := s.Clone()
si.URL = url
return si
}
//MustJoin clone and join with given urlpath
func (s *ServerInfo) MustJoin(urlpath string) *ServerInfo {
su, err := url.Parse(s.URL)
if err != nil {
panic(err)
}
su.Path = path.Join(su.Path, urlpath)
si := s.Clone()
si.URL = su.String()
return si
}
//CreatePreset create new preset.
//Return preset created and any error raised.
func (s *ServerInfo) CreatePreset() (*Preset, error) {
p := BuildPreset(URL(s.URL), Method(s.Method), Header(s.Header))
return p, nil
}
//IsEmpty check if server info is empty
//IsEmpty will return true if equal nil or s.URL is empty string
func (s *ServerInfo) IsEmpty() bool {
return s == nil || s.URL == ""
}
//Clone clone a new serverinfo
func (s *ServerInfo) Clone() *ServerInfo {
si := &ServerInfo{
URL: s.URL,
Header: s.Header.Clone(),
Method: s.Method,
}
return si
}
//Server http server config struct
type Server struct {
ServerInfo
Client Client
}
//CreatePreset create new preset.
//Return preset created and any error raised.
func (s *Server) CreatePreset() (*Preset, error) {
var err error
doer, err := s.Client.CreateDoer()
if err != nil {
return nil, err
}
p, err := s.ServerInfo.CreatePreset()
if err != nil {
return nil, err
}
return p.Concat(SetDoer(doer)), nil
}
//Clone clone a new server config
func (s *Server) Clone() *Server {
return &Server{
ServerInfo: *s.ServerInfo.Clone(),
Client: *s.Client.Clone(),
}
}
//MergeURL clone and merge with given url
func (s *Server) MergeURL(url string) *Server {
return &Server{
ServerInfo: *s.ServerInfo.MergeURL(url),
Client: *s.Client.Clone(),
}
}
//MergeURL clone and merge with given method
func (s *Server) MergeMethod(method string) *Server {
return &Server{
ServerInfo: *s.ServerInfo.MergeMethod(method),
Client: *s.Client.Clone(),
}
}
//MustJoin clone and join with given urlpath
func (s *Server) MustJoin(urlpath string) *Server {
return &Server{
ServerInfo: *s.ServerInfo.MustJoin(urlpath),
Client: *s.Client.Clone(),
}
}
//PresetFactory preset factory.
type PresetFactory interface {
//CreatePreset create new preset.
//Return preset created and any error raised.
CreatePreset() (*Preset, error)
}
//MustPreset create preset by given preset factory.
//Return preset created.
//Panic if any error raised.
func MustPreset(f PresetFactory) *Preset {
p, err := f.CreatePreset()
if err != nil {
panic(err)
}
return p
}