/
parser.go
210 lines (186 loc) · 6.65 KB
/
parser.go
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package fetcher
import (
"encoding/json"
"io"
)
//Parser response parser interface
//Parser is responsible for closing response body.
type Parser interface {
//Parse parse response data.
//Return Response and any error if raised.
Parse(*Response) error
}
//ParserFunc parser func type
type ParserFunc func(resp *Response) error
//Parse parse response data.
//Return Response and any error if raised.
func (p ParserFunc) Parse(resp *Response) error {
return p(resp)
}
//ShouldFunc create should parase func with given condition and next parser.
func ShouldFunc(condition func(resp *Response) error, next Parser) Parser {
return ParserFunc(func(resp *Response) error {
err := condition(resp)
if err != nil && IsResponseErr(err) {
resp.BodyContent()
return err
}
if next == nil {
return DefaultParser.Parse(resp)
}
return next.Parse(resp)
})
}
//ShouldBetween parser that check if status code between min and max(include min/max).
//Give parser will parse responese if success or respnse will be returned as error.
func ShouldBetween(min int, max int, p Parser) Parser {
return ShouldFunc(func(resp *Response) error {
if resp.StatusCode < min || resp.StatusCode > max {
return resp
}
return nil
}, p)
}
//Should200 parser that check if status code == 200.
//Give parser will parse responese if success or respnse will be returned as error.
func Should200(p Parser) Parser {
return ShouldFunc(func(resp *Response) error {
if resp.StatusCode != 200 {
return resp
}
return nil
}, p)
}
//ShouldSuccess parser that check if status code < 300.
//Give parser will parse responese if success or respnse will be returned as error.
func ShouldSuccess(p Parser) Parser {
return ShouldFunc(func(resp *Response) error {
if resp.StatusCode >= 300 {
return resp
}
return nil
}, p)
}
//ShouldNoError parser that check if status code < 500.
//Give parser will parse responese if success or respnse will be returned as error.
func ShouldNoError(p Parser) Parser {
return ShouldFunc(func(resp *Response) error {
if resp.StatusCode >= 500 {
return resp
}
return nil
}, p)
}
//AsBytes create parser which parse givn byte slice from response.
func AsBytes(bytes *[]byte) Parser {
return ParserFunc(func(resp *Response) error {
bs, err := resp.BodyContent()
if err != nil {
return err
}
*bytes = make([]byte, len(bs))
copy(*bytes, bs)
return nil
})
}
//AsDownload create parser which parse givn byte slice from response.
//You SHOULD NOT use BodyContent if you parsed response with Download Parser.
//This parser is designed to download file.
func AsDownload(w io.Writer) Parser {
return ParserFunc(func(resp *Response) error {
defer resp.Response.Body.Close()
_, err := io.Copy(w, resp.Body)
return err
})
}
//AsString create parser which parse givn string from response.
func AsString(str *string) Parser {
return ParserFunc(func(resp *Response) error {
bs, err := resp.BodyContent()
if err != nil {
return err
}
s := string(bs)
*str = s
return nil
})
}
//AsJSON create parser which parse givn value from response a JSON format.
func AsJSON(v interface{}) Parser {
return ParserFunc(func(resp *Response) error {
bs, err := resp.BodyContent()
if err != nil {
return err
}
err = json.Unmarshal(bs, v)
if err != nil {
return err
}
return err
})
}
var DefaultParser = AsBodyContent
//AsBodyContent read body to bodycontent
var AsBodyContent Parser = ParserFunc(func(resp *Response) error {
_, err := resp.BodyContent()
return err
})
//AsReader keep response body unreaded.
//You must close resp.Body manually.
var AsReader Parser = ParserFunc(func(resp *Response) error {
return nil
})
//AsUselessBody do not use response body and close response body
var AsUselessBody Parser = ParserFunc(func(resp *Response) error {
return resp.Body.Close()
})
//Fetch create new fetcher ,exec commands and fetch response.
//Return http response and any error if raised.
//Response returned will be parsed by defualt parser.
func Fetch(cmds ...Command) (*Response, error) {
return FetchAndParse(Concat(cmds...), DefaultParser)
}
//FetchAndParse fetch request and prase response with given preset 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 FetchAndParse(preset *Preset, parser Parser) (*Response, error) {
resp, err := request(preset)
if err != nil {
return nil, err
}
err = parser.Parse(resp)
if err != nil {
return resp, err
}
return resp, nil
}
//DoAndParse do request and prase response with given doer,preset 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 DoAndParse(doer Doer, preset *Preset, parser Parser) (*Response, error) {
return FetchAndParse(preset.Concat(SetDoer(doer)), parser)
}
//FetchWithBodyAndParse fetch request and prase response with given preset ,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 FetchWithBodyAndParse(preset *Preset, body io.Reader, parser Parser) (*Response, error) {
return FetchAndParse(preset.Concat(Body(body)), parser)
}
//FetchWithJSONBodyAndParse fetch request and prase response with given preset , 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 FetchWithJSONBodyAndParse(preset *Preset, body interface{}, parser Parser) (*Response, error) {
return FetchAndParse(preset.Concat(JSONBody(body)), parser)
}
//DoWithBodyAndParse do request and prase response with given doer,preset,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 DoWithBodyAndParse(doer Doer, preset *Preset, body io.Reader, parser Parser) (*Response, error) {
return FetchAndParse(preset.Concat(SetDoer(doer), Body(body)), parser)
}
//DoWithJSONBodyAndParse do request and prase response with given doer,preset,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 DoWithJSONBodyAndParse(doer Doer, preset *Preset, body interface{}, parser Parser) (*Response, error) {
return FetchAndParse(preset.Concat(SetDoer(doer), JSONBody(body)), parser)
}