func()

in opensearchapi/api.exists.go [83:205]
98 lines of code
26 McCabe index (conditional complexity)

func (r ExistsRequest) Do(ctx context.Context, transport Transport) (*Response, error) {
	var (
		method string
		path   strings.Builder
		params map[string]string
	)

	method = "HEAD"

	if r.DocumentType == "" {
		r.DocumentType = "_doc"
	}

	path.Grow(1 + len(r.Index) + 1 + len(r.DocumentType) + 1 + len(r.DocumentID))
	path.WriteString("/")
	path.WriteString(r.Index)
	if r.DocumentType != "" {
		path.WriteString("/")
		path.WriteString(r.DocumentType)
	}
	path.WriteString("/")
	path.WriteString(r.DocumentID)

	params = make(map[string]string)

	if r.Preference != "" {
		params["preference"] = r.Preference
	}

	if r.Realtime != nil {
		params["realtime"] = strconv.FormatBool(*r.Realtime)
	}

	if r.Refresh != nil {
		params["refresh"] = strconv.FormatBool(*r.Refresh)
	}

	if r.Routing != "" {
		params["routing"] = r.Routing
	}

	if len(r.Source) > 0 {
		params["_source"] = strings.Join(r.Source, ",")
	}

	if len(r.SourceExcludes) > 0 {
		params["_source_excludes"] = strings.Join(r.SourceExcludes, ",")
	}

	if len(r.SourceIncludes) > 0 {
		params["_source_includes"] = strings.Join(r.SourceIncludes, ",")
	}

	if len(r.StoredFields) > 0 {
		params["stored_fields"] = strings.Join(r.StoredFields, ",")
	}

	if r.Version != nil {
		params["version"] = strconv.FormatInt(int64(*r.Version), 10)
	}

	if r.VersionType != "" {
		params["version_type"] = r.VersionType
	}

	if r.Pretty {
		params["pretty"] = "true"
	}

	if r.Human {
		params["human"] = "true"
	}

	if r.ErrorTrace {
		params["error_trace"] = "true"
	}

	if len(r.FilterPath) > 0 {
		params["filter_path"] = strings.Join(r.FilterPath, ",")
	}

	req, err := newRequest(method, path.String(), nil)
	if err != nil {
		return nil, err
	}

	if len(params) > 0 {
		q := req.URL.Query()
		for k, v := range params {
			q.Set(k, v)
		}
		req.URL.RawQuery = q.Encode()
	}

	if len(r.Header) > 0 {
		if len(req.Header) == 0 {
			req.Header = r.Header
		} else {
			for k, vv := range r.Header {
				for _, v := range vv {
					req.Header.Add(k, v)
				}
			}
		}
	}

	if ctx != nil {
		req = req.WithContext(ctx)
	}

	res, err := transport.Perform(req)
	if err != nil {
		return nil, err
	}

	response := Response{
		StatusCode: res.StatusCode,
		Body:       res.Body,
		Header:     res.Header,
	}

	return &response, nil
}