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service.go
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service.go
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package httppost
import (
"bytes"
"crypto/tls"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"strconv"
"sync"
"text/template"
"time"
"context"
"github.com/influxdata/kapacitor/alert"
khttp "github.com/influxdata/kapacitor/http"
"github.com/influxdata/kapacitor/keyvalue"
"github.com/pkg/errors"
)
type Diagnostic interface {
WithContext(ctx ...keyvalue.T) Diagnostic
Error(msg string, err error, ctx ...keyvalue.T)
}
// Only one of name and url should be non-empty
type Endpoint struct {
mu sync.RWMutex
url string
headers map[string]string
auth BasicAuth
alertTemplate *template.Template
rowTemplate *template.Template
closed bool
}
func NewEndpoint(url string, headers map[string]string, auth BasicAuth, at, rt *template.Template) *Endpoint {
return &Endpoint{
url: url,
headers: headers,
auth: auth,
alertTemplate: at,
rowTemplate: rt,
}
}
func (e *Endpoint) Close() {
e.mu.Lock()
defer e.mu.Unlock()
e.closed = true
return
}
func (e *Endpoint) Update(c Config) error {
e.mu.Lock()
defer e.mu.Unlock()
e.url = c.URL
e.headers = c.Headers
e.auth = c.BasicAuth
at, err := c.getAlertTemplate()
if err != nil {
return err
}
e.alertTemplate = at
rt, err := c.getRowTemplate()
if err != nil {
return err
}
e.rowTemplate = rt
return nil
}
func (e *Endpoint) AlertTemplate() *template.Template {
e.mu.RLock()
defer e.mu.RUnlock()
return e.alertTemplate
}
func (e *Endpoint) RowTemplate() *template.Template {
e.mu.RLock()
defer e.mu.RUnlock()
return e.rowTemplate
}
func (e *Endpoint) NewHTTPRequest(body io.Reader) (req *http.Request, err error) {
e.mu.RLock()
defer e.mu.RUnlock()
if e.closed {
return nil, errors.New("endpoint was closed")
}
req, err = http.NewRequest("POST", e.url, body)
if err != nil {
return nil, fmt.Errorf("failed to create POST request: %v", err)
}
if e.auth.valid() {
req.SetBasicAuth(e.auth.Username, e.auth.Password)
}
for k, v := range e.headers {
req.Header.Add(k, v)
}
return req, nil
}
type Service struct {
mu sync.RWMutex
endpoints map[string]*Endpoint
diag Diagnostic
}
func NewService(c Configs, d Diagnostic) (*Service, error) {
endpoints, err := c.index()
if err != nil {
return nil, err
}
return &Service{
diag: d,
endpoints: endpoints,
}, nil
}
func (s *Service) Endpoint(name string) (*Endpoint, bool) {
s.mu.RLock()
defer s.mu.RUnlock()
e, ok := s.endpoints[name]
return e, ok
}
func (s *Service) Update(newConfigs []interface{}) error {
s.mu.Lock()
defer s.mu.Unlock()
endpointSet := map[string]bool{}
for _, nc := range newConfigs {
if c, ok := nc.(Config); ok {
if err := c.Validate(); err != nil {
return err
}
e, ok := s.endpoints[c.Endpoint]
if !ok {
at, err := c.getAlertTemplate()
if err != nil {
return errors.Wrapf(err, "failed to get alert template for endpoint %q", c.Endpoint)
}
rt, err := c.getRowTemplate()
if err != nil {
return errors.Wrapf(err, "failed to get row template for endpoint %q", c.Endpoint)
}
s.endpoints[c.Endpoint] = NewEndpoint(c.URL, c.Headers, c.BasicAuth, at, rt)
continue
}
if err := e.Update(c); err != nil {
return errors.Wrapf(err, "failed to update endpoint %q", c.Endpoint)
}
endpointSet[c.Endpoint] = true
} else {
return fmt.Errorf("unexpected config object type, got %T exp %T", nc, c)
}
}
// Find any deleted endpoints
for name, endpoint := range s.endpoints {
if !endpointSet[name] {
endpoint.Close()
delete(s.endpoints, name)
}
}
return nil
}
func (s *Service) Open() error {
return nil
}
func (s *Service) Close() error {
return nil
}
type testOptions struct {
Endpoint string `json:"endpoint"`
URL string `json:"url"`
Headers map[string]string `json:"headers"`
Timeout time.Duration `json:"timeout"`
}
func (s *Service) TestOptions() interface{} {
return &testOptions{
Endpoint: "example",
URL: "http://localhost:3000/",
Headers: map[string]string{"Auth": "secret"},
}
}
func (s *Service) Test(options interface{}) error {
var err error
o, ok := options.(*testOptions)
if !ok {
return fmt.Errorf("unexpected options type %t", options)
}
event := alert.Event{}
body := bytes.NewBuffer(nil)
ad := event.AlertData()
err = json.NewEncoder(body).Encode(ad)
if err != nil {
return fmt.Errorf("failed to marshal alert data json: %v", err)
}
// Create the HTTP request
var req *http.Request
e := &Endpoint{
url: o.URL,
headers: o.Headers,
}
req, err = e.NewHTTPRequest(body)
// Execute the request
req.Header.Set("Content-Type", "application/json")
resp, err := http.DefaultClient.Do(req)
if err != nil {
return fmt.Errorf("failed to POST alert data: %v", err)
}
resp.Body.Close()
return nil
}
type HandlerConfig struct {
URL string `mapstructure:"url"`
Endpoint string `mapstructure:"endpoint"`
Headers map[string]string `mapstructure:"headers"`
CaptureResponse bool `mapstructure:"capture-response"`
Timeout time.Duration `mapstructure:"timeout"`
SkipSSLVerification bool `mapstructure:"skip-ssl-verification"`
}
type handler struct {
s *Service
endpoint *Endpoint
headers map[string]string
captureResponse bool
diag Diagnostic
timeout time.Duration
skipSSLVerification bool
hc *http.Client
}
func (s *Service) Handler(c HandlerConfig, ctx ...keyvalue.T) alert.Handler {
e, ok := s.Endpoint(c.Endpoint)
if !ok {
e = NewEndpoint(c.URL, nil, BasicAuth{}, nil, nil)
}
return &handler{
s: s,
endpoint: e,
diag: s.diag.WithContext(ctx...),
headers: c.Headers,
captureResponse: c.CaptureResponse,
timeout: c.Timeout,
skipSSLVerification: c.SkipSSLVerification,
}
}
func (h *handler) NewHTTPRequest(body io.Reader) (req *http.Request, err error) {
req, err = h.endpoint.NewHTTPRequest(body)
if err != nil {
return
}
for k, v := range h.headers {
req.Header.Set(k, v)
}
return
}
func (h *handler) Handle(event alert.Event) {
var err error
// Construct the body of the HTTP request
body := new(bytes.Buffer)
ad := event.AlertData()
var contentType string
if h.endpoint.AlertTemplate() != nil {
err := h.endpoint.AlertTemplate().Execute(body, ad)
if err != nil {
h.diag.Error("failed to execute alert template", err)
return
}
} else {
err = json.NewEncoder(body).Encode(ad)
if err != nil {
h.diag.Error("failed to marshal alert data json", err)
return
}
contentType = "application/json"
}
req, err := h.NewHTTPRequest(body)
if err != nil {
h.diag.Error("failed to create HTTP request", err)
return
}
if contentType != "" {
req.Header.Set("Content-Type", contentType)
}
// Set timeout
if h.timeout > 0 {
ctx, cancel := context.WithTimeout(req.Context(), h.timeout)
defer cancel()
req = req.WithContext(ctx)
}
// Setup HTTP client
var tlsConfig *tls.Config
if h.skipSSLVerification {
tlsConfig = &tls.Config{
InsecureSkipVerify: true,
}
}
httpClient := &http.Client{
Transport: khttp.NewDefaultTransportWithTLS(tlsConfig),
}
// Execute the request
resp, err := httpClient.Do(req)
if err != nil {
h.diag.Error("failed to POST alert data", err)
return
}
defer resp.Body.Close()
if resp.StatusCode/100 != 2 {
var err error
if h.captureResponse {
var body []byte
body, err = ioutil.ReadAll(resp.Body)
if err == nil {
// Use the body content as the error
err = errors.New(string(body))
}
} else {
err = errors.New("unknown error, use .captureResponse() to capture the HTTP response")
}
h.diag.Error("POST returned non 2xx status code", err, keyvalue.KV("code", strconv.Itoa(resp.StatusCode)))
}
}