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client.go
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client.go
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package client
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"net/http"
"net/url"
"github.com/flynn/go-discoverd"
"github.com/flynn/go-discoverd/dialer"
"github.com/flynn/strowger/types"
)
func New() (Client, error) {
if err := discoverd.Connect(""); err != nil {
return nil, err
}
return NewWithDiscoverd("", discoverd.DefaultClient), nil
}
func NewWithDiscoverd(name string, dc dialer.DiscoverdClient) Client {
if name == "" {
name = "strowger"
}
c := &client{
dialer: dialer.New(dc, nil),
url: fmt.Sprintf("http://%s-api", name),
}
c.http = &http.Client{Transport: &http.Transport{Dial: c.dialer.Dial}}
return c
}
type Client interface {
CreateRoute(*strowger.Route) error
SetRoute(*strowger.Route) error
DeleteRoute(id string) error
GetRoute(id string) (*strowger.Route, error)
ListRoutes(parentRef string) ([]*strowger.Route, error)
Close() error
}
var ErrNotFound = errors.New("strowger: route not found")
type HTTPError struct {
Response *http.Response
}
func (e HTTPError) Error() string {
return fmt.Sprintf("strowger: expected http status 200, got %d", e.Response.StatusCode)
}
type client struct {
url string
dialer dialer.Dialer
http *http.Client
}
func (c *client) get(path string, v interface{}) error {
res, err := c.http.Get(c.url + path)
if err != nil {
return err
}
defer res.Body.Close()
if res.StatusCode == 404 {
return ErrNotFound
}
if res.StatusCode != 200 {
return HTTPError{res}
}
return json.NewDecoder(res.Body).Decode(v)
}
func (c *client) post(path string, v interface{}) error {
return c.postJSON("POST", path, v)
}
func (c *client) put(path string, v interface{}) error {
return c.postJSON("PUT", path, v)
}
func (c *client) postJSON(method string, path string, v interface{}) error {
buf, err := json.Marshal(v)
if err != nil {
return err
}
req, err := http.NewRequest(method, c.url+path, bytes.NewBuffer(buf))
if err != nil {
return err
}
req.Header.Set("Content-Type", "application/json")
res, err := c.http.Do(req)
if err != nil {
return err
}
defer res.Body.Close()
if res.StatusCode != 200 {
return HTTPError{res}
}
return json.NewDecoder(res.Body).Decode(v)
}
func (c *client) delete(path string) error {
req, err := http.NewRequest("DELETE", c.url+path, nil)
if err != nil {
return err
}
res, err := c.http.Do(req)
if err != nil {
return err
}
res.Body.Close()
if res.StatusCode == 404 {
return ErrNotFound
}
if res.StatusCode != 200 {
return HTTPError{res}
}
return nil
}
func (c *client) CreateRoute(r *strowger.Route) error {
return c.post("/routes", r)
}
func (c *client) SetRoute(r *strowger.Route) error {
return c.put("/routes", r)
}
func (c *client) DeleteRoute(id string) error {
return c.delete("/routes/" + id)
}
func (c *client) GetRoute(id string) (*strowger.Route, error) {
res := &strowger.Route{}
err := c.get("/routes/"+id, res)
return res, err
}
func (c *client) ListRoutes(parentRef string) ([]*strowger.Route, error) {
path := "/routes"
if parentRef != "" {
q := make(url.Values)
q.Set("parent_ref", parentRef)
path += "?" + q.Encode()
}
var res []*strowger.Route
err := c.get(path, &res)
return res, err
}
func (c *client) Close() error {
return c.dialer.Close()
}