119 lines
2.8 KiB
Go
119 lines
2.8 KiB
Go
package requests
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import (
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"context"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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)
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// Builder allows users to construct a request and then execute the
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// request via Do().
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// Do returns a Result which allows the user to get the body,
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// unmarshal the body into an interface, or into a simplejson.Json.
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type Builder interface {
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WithContext(context.Context) Builder
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WithBody(io.Reader) Builder
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WithMethod(string) Builder
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WithHeaders(http.Header) Builder
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SetHeader(key, value string) Builder
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Do() Result
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}
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type builder struct {
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context context.Context
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method string
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endpoint string
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body io.Reader
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header http.Header
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result *result
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}
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// New provides a new Builder for the given endpoint.
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func New(endpoint string) Builder {
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return &builder{
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endpoint: endpoint,
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method: "GET",
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}
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}
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// WithContext adds a context to the request.
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// If no context is provided, context.Background() is used instead.
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func (r *builder) WithContext(ctx context.Context) Builder {
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r.context = ctx
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return r
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}
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// WithBody adds a body to the request.
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func (r *builder) WithBody(body io.Reader) Builder {
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r.body = body
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return r
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}
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// WithMethod sets the request method. Defaults to "GET".
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func (r *builder) WithMethod(method string) Builder {
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r.method = method
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return r
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}
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// WithHeaders replaces the request header map with the given header map.
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func (r *builder) WithHeaders(header http.Header) Builder {
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r.header = header
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return r
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}
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// SetHeader sets a single header to the given value.
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// May be used to add multiple headers.
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func (r *builder) SetHeader(key, value string) Builder {
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if r.header == nil {
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r.header = make(http.Header)
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}
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r.header.Set(key, value)
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return r
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}
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// Do performs the request and returns the response in its raw form.
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// If the request has already been performed, returns the previous result.
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// This will not allow you to repeat a request.
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func (r *builder) Do() Result {
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if r.result != nil {
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// Request has already been done
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return r.result
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}
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// Must provide a non-nil context to NewRequestWithContext
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if r.context == nil {
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r.context = context.Background()
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}
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return r.do()
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}
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// do creates the request, executes it with the default client and extracts the
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// the body into the response
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func (r *builder) do() Result {
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req, err := http.NewRequestWithContext(r.context, r.method, r.endpoint, r.body)
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if err != nil {
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r.result = &result{err: fmt.Errorf("error creating request: %v", err)}
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return r.result
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}
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req.Header = r.header
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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r.result = &result{err: fmt.Errorf("error performing request: %v", err)}
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return r.result
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}
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defer resp.Body.Close()
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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r.result = &result{err: fmt.Errorf("error reading response body: %v", err)}
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return r.result
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}
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r.result = &result{response: resp, body: body}
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return r.result
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}
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