forked from nytimes/gizmo
/
http_client.go
127 lines (113 loc) · 2.84 KB
/
http_client.go
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package readinglist
import (
"context"
"encoding/json"
"io"
"net/http"
"net/url"
"strconv"
"time"
"github.com/go-kit/kit/endpoint"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/sd"
"github.com/go-kit/kit/sd/lb"
httptransport "github.com/go-kit/kit/transport/http"
"github.com/pkg/errors"
)
type Client struct {
key string
l log.Logger
put endpoint.Endpoint
get endpoint.Endpoint
}
func NewClient(host string, l log.Logger, opts ...httptransport.ClientOption) *Client {
return &Client{
put: retryEndpoint(httptransport.NewClient(
http.MethodPut,
mustParseURL(host, "/link"),
encodePut,
decodePutResp,
opts...,
).Endpoint(), l),
get: retryEndpoint(httptransport.NewClient(
http.MethodGet,
mustParseURL(host, "/list"),
encodeGet,
decodeGetResp,
opts...,
).Endpoint(), l),
}
}
func (c Client) GetLinks(ctx context.Context, limit int) (*Links, error) {
out, err := c.get(ctx, &GetListLimitRequest{Limit: int32(limit)})
if out != nil {
return out.(*Links), err
}
return nil, err
}
func (c Client) PutLink(ctx context.Context, url string, delete bool) (*Message, error) {
out, err := c.put(ctx, &PutLinkRequest{
Request: &LinkRequest{
Link: &Link{Url: url},
Delete: delete,
},
})
if out != nil {
return out.(*Message), err
}
return nil, err
}
func encodePut(ctx context.Context, r *http.Request, req interface{}) error {
pr := req.(*PutLinkRequest)
return httptransport.EncodeJSONRequest(ctx, r, pr.Request)
}
func encodeGet(ctx context.Context, r *http.Request, req interface{}) error {
gr := req.(*GetListLimitRequest)
r.URL.Path += strconv.FormatInt(int64(gr.Limit), 10)
return nil
}
func decodeGetResp(ctx context.Context, r *http.Response) (interface{}, error) {
switch r.StatusCode {
case http.StatusOK:
var res Links
err := json.NewDecoder(r.Body).Decode(&res)
return &res, errors.Wrap(err, "unable to decode response")
default:
var res Message
err := json.NewDecoder(r.Body).Decode(&res)
if err != nil {
errors.Wrap(err, "unable to decode response")
}
return nil, errors.New(res.Message)
}
}
func decodePutResp(ctx context.Context, r *http.Response) (interface{}, error) {
var res Message
err := json.NewDecoder(r.Body).Decode(&res)
if err != nil {
return nil, errors.Wrap(err, "unable to decode response")
}
switch r.StatusCode {
case http.StatusOK:
return &res, nil
default:
return nil, errors.New(res.Message)
}
}
func mustParseURL(host, path string) *url.URL {
r, err := url.Parse(host + path)
if err != nil {
panic("invalid url: " + err.Error())
}
return r
}
func retryEndpoint(e endpoint.Endpoint, l log.Logger) endpoint.Endpoint {
bl := sd.NewEndpointer(
sd.FixedInstancer{"1"},
sd.Factory(func(_ string) (endpoint.Endpoint, io.Closer, error) {
return e, nil, nil
}),
l,
)
return lb.Retry(3, 2*time.Second, lb.NewRoundRobin(bl))
}