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api.go
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api.go
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package api
import (
"bytes"
"context"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"path"
"strconv"
"time"
jsoniter "github.com/json-iterator/go"
"github.com/pkg/errors"
)
var json = jsoniter.ConfigCompatibleWithStandardLibrary
// API -
type API struct {
url string
client *http.Client
}
// New -
func New(baseURL string) *API {
t := http.DefaultTransport.(*http.Transport).Clone()
t.MaxIdleConns = 100
t.MaxConnsPerHost = 100
t.MaxIdleConnsPerHost = 100
return &API{
url: baseURL,
client: &http.Client{
Timeout: time.Minute,
Transport: t,
},
}
}
func (tzkt *API) get(ctx context.Context, endpoint string, args map[string]string) (*http.Response, error) {
u, err := url.Parse(tzkt.url)
if err != nil {
return nil, err
}
u.Path = path.Join(u.Path, endpoint)
values := u.Query()
for key, value := range args {
values.Add(key, value)
}
u.RawQuery = values.Encode()
req, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
if err != nil {
return nil, err
}
return tzkt.client.Do(req)
}
func (tzkt *API) post(ctx context.Context, endpoint string, args map[string]string, body interface{}) (*http.Response, error) {
u, err := url.Parse(tzkt.url)
if err != nil {
return nil, err
}
u.Path = path.Join(u.Path, endpoint)
values := u.Query()
for key, value := range args {
values.Add(key, value)
}
u.RawQuery = values.Encode()
var buf bytes.Buffer
if body != nil {
if err := json.NewEncoder(&buf).Encode(body); err != nil {
return nil, err
}
}
req, err := http.NewRequestWithContext(ctx, http.MethodPost, u.String(), &buf)
if err != nil {
return nil, err
}
req.Header.Add("Content-Type", "application/json")
return tzkt.client.Do(req)
}
func (tzkt *API) json(ctx context.Context, endpoint string, args map[string]string, output interface{}) error {
resp, err := tzkt.get(ctx, endpoint, args)
if err != nil {
return err
}
defer resp.Body.Close()
switch resp.StatusCode {
case http.StatusOK:
return json.NewDecoder(resp.Body).Decode(output)
case http.StatusNoContent:
return nil
default:
return errors.New(fmt.Sprintf("%s: %s %v", resp.Status, endpoint, args))
}
}
func (tzkt *API) count(ctx context.Context, endpoint string) (uint64, error) {
resp, err := tzkt.get(ctx, endpoint, nil)
if err != nil {
return 0, err
}
defer resp.Body.Close()
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return 0, err
}
return strconv.ParseUint(string(data), 10, 64)
}
// GetHead -
func (tzkt *API) GetHead(ctx context.Context) (head Head, err error) {
err = tzkt.json(ctx, "/v1/head", nil, &head)
return
}