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healthchecks.go
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healthchecks.go
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package healthchecks
import (
"context"
"errors"
"fmt"
"net/http"
)
var (
// ErrBadStatusCode is the error returned when a bad status code occurs.
ErrBadStatusCode = errors.New("Bad status code from healthchecks")
// DefaultURL is the default url to healthchecks.
DefaultURL = "https://hc-ping.com/"
)
// A Client manages communication with Healthchecks.
type Client struct {
http *http.Client
url string
}
// NewClient returns a new Healthchecks client. If a nil httpClient is
// provided, http.DefaultClient will be used.
func NewClient(httpClient *http.Client, args ...string) *Client {
if httpClient == nil {
httpClient = http.DefaultClient
}
c := &Client{
http: httpClient,
}
if len(args) > 0 {
c.url = args[0]
}
return c
}
// Success sends a success request to Healthchecks, a error is returned
// if a error has occurred.
func (c *Client) Success(ctx context.Context, id string) error {
return c.get(ctx, c.createURL(id))
}
// Fail sends a fail request to Healthchecks, a error is returned
// if a error has occurred.
func (c *Client) Fail(ctx context.Context, id string) error {
return c.get(ctx, fmt.Sprintf("%s/fail", c.createURL(id)))
}
// Start sends a start request to Healthchecks.io to indicate that the job has started.
func (c *Client) Start(ctx context.Context, id string) error {
return c.get(ctx, fmt.Sprintf("%s/start", c.createURL(id)))
}
func (c *Client) createURL(id string) string {
url := c.url
if url == "" {
url = DefaultURL
}
if url[len(url)-1] != '/' {
url += "/"
}
return fmt.Sprintf("%s%s", url, id)
}
func (c *Client) get(ctx context.Context, url string) error {
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return err
}
req = req.WithContext(ctx)
res, err := c.http.Do(req)
if err != nil {
select {
case <-ctx.Done():
return ctx.Err()
default:
}
return err
}
defer res.Body.Close()
if res.StatusCode == 200 {
return nil
}
return ErrBadStatusCode
}