gatus/alerting/provider/custom/custom.go
2022-06-20 21:25:14 -04:00

98 lines
3.8 KiB
Go

package custom
import (
"bytes"
"fmt"
"io"
"net/http"
"strings"
"github.com/TwiN/gatus/v4/alerting/alert"
"github.com/TwiN/gatus/v4/client"
"github.com/TwiN/gatus/v4/core"
)
// AlertProvider is the configuration necessary for sending an alert using a custom HTTP request
// Technically, all alert providers should be reachable using the custom alert provider
type AlertProvider struct {
URL string `yaml:"url"`
Method string `yaml:"method,omitempty"`
Body string `yaml:"body,omitempty"`
Headers map[string]string `yaml:"headers,omitempty"`
Placeholders map[string]map[string]string `yaml:"placeholders,omitempty"`
// ClientConfig is the configuration of the client used to communicate with the provider's target
ClientConfig *client.Config `yaml:"client,omitempty"`
// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
}
// IsValid returns whether the provider's configuration is valid
func (provider *AlertProvider) IsValid() bool {
if provider.ClientConfig == nil {
provider.ClientConfig = client.GetDefaultConfig()
}
return len(provider.URL) > 0 && provider.ClientConfig != nil
}
// GetAlertStatePlaceholderValue returns the Placeholder value for ALERT_TRIGGERED_OR_RESOLVED if configured
func (provider *AlertProvider) GetAlertStatePlaceholderValue(resolved bool) string {
status := "TRIGGERED"
if resolved {
status = "RESOLVED"
}
if _, ok := provider.Placeholders["ALERT_TRIGGERED_OR_RESOLVED"]; ok {
if val, ok := provider.Placeholders["ALERT_TRIGGERED_OR_RESOLVED"][status]; ok {
return val
}
}
return status
}
func (provider *AlertProvider) buildHTTPRequest(endpoint *core.Endpoint, alert *alert.Alert, resolved bool) *http.Request {
body, url, method := provider.Body, provider.URL, provider.Method
body = strings.ReplaceAll(body, "[ALERT_DESCRIPTION]", alert.GetDescription())
url = strings.ReplaceAll(url, "[ALERT_DESCRIPTION]", alert.GetDescription())
body = strings.ReplaceAll(body, "[ENDPOINT_NAME]", endpoint.Name)
url = strings.ReplaceAll(url, "[ENDPOINT_NAME]", endpoint.Name)
body = strings.ReplaceAll(body, "[ENDPOINT_GROUP]", endpoint.Group)
url = strings.ReplaceAll(url, "[ENDPOINT_GROUP]", endpoint.Group)
body = strings.ReplaceAll(body, "[ENDPOINT_URL]", endpoint.URL)
url = strings.ReplaceAll(url, "[ENDPOINT_URL]", endpoint.URL)
if resolved {
body = strings.ReplaceAll(body, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(true))
url = strings.ReplaceAll(url, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(true))
} else {
body = strings.ReplaceAll(body, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(false))
url = strings.ReplaceAll(url, "[ALERT_TRIGGERED_OR_RESOLVED]", provider.GetAlertStatePlaceholderValue(false))
}
if len(method) == 0 {
method = http.MethodGet
}
bodyBuffer := bytes.NewBuffer([]byte(body))
request, _ := http.NewRequest(method, url, bodyBuffer)
for k, v := range provider.Headers {
request.Header.Set(k, v)
}
return request
}
func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) error {
request := provider.buildHTTPRequest(endpoint, alert, resolved)
response, err := client.GetHTTPClient(provider.ClientConfig).Do(request)
if err != nil {
return err
}
if response.StatusCode > 399 {
body, _ := io.ReadAll(response.Body)
return fmt.Errorf("call to provider alert returned status code %d: %s", response.StatusCode, string(body))
}
return err
}
// GetDefaultAlert returns the provider's default alert configuration
func (provider AlertProvider) GetDefaultAlert() *alert.Alert {
return provider.DefaultAlert
}