feat(alerting): Add GitLab alerting provider (#485)
* feat: ✨ add gitlab provider * docs: 📝 add documentation for gitlab provider * docs: 📝 fix removed github screenshot * refactor: ➖ remove uniuri dependency * refactor: 🎨 correctly capitalize GitLab * Update alerting/alert/type.go * fix: 💡 correct comments about webhook url and authorization key * Update alerting/provider/gitlab/gitlab.go * Update alerting/provider/gitlab/gitlab_test.go --------- Co-authored-by: TwiN <twin@linux.com>
This commit is contained in:
Hugues Lismonde
GitHub
147
alerting/provider/gitlab/gitlab.go
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147
alerting/provider/gitlab/gitlab.go
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package gitlab
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"time"
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"github.com/TwiN/gatus/v5/alerting/alert"
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"github.com/TwiN/gatus/v5/client"
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"github.com/TwiN/gatus/v5/core"
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"github.com/google/uuid"
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)
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// AlertProvider is the configuration necessary for sending an alert using GitLab
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type AlertProvider struct {
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WebhookURL string `yaml:"webhook-url"` // The webhook url provided by GitLab
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AuthorizationKey string `yaml:"authorization-key"` // The authorization key provided by GitLab
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// DefaultAlert is the default alert configuration to use for endpoints with an alert of the appropriate type
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DefaultAlert *alert.Alert `yaml:"default-alert,omitempty"`
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// Severity can be one of: critical, high, medium, low, info, unknown. Defaults to critical
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Severity string `yaml:"severity,omitempty"`
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// MonitoringTool overrides the name sent to gitlab. Defaults to gatus
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MonitoringTool string `yaml:"monitoring-tool,omitempty"`
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// EnvironmentName is the name of the associated GitLab environment. Required to display alerts on a dashboard.
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EnvironmentName string `yaml:"environment-name,omitempty"`
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// Service affected. Defaults to endpoint display name
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Service string `yaml:"service,omitempty"`
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}
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// IsValid returns whether the provider's configuration is valid
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func (provider *AlertProvider) IsValid() bool {
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if len(provider.AuthorizationKey) == 0 || len(provider.WebhookURL) == 0 {
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return false
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}
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// Validate format of the repository URL
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_, err := url.Parse(provider.WebhookURL)
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if err != nil {
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return false
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}
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return true
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}
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// Send creates an issue in the designed RepositoryURL if the resolved parameter passed is false,
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// or closes the relevant issue(s) if the resolved parameter passed is true.
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func (provider *AlertProvider) Send(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) error {
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if len(alert.ResolveKey) == 0 {
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alert.ResolveKey = uuid.NewString()
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}
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buffer := bytes.NewBuffer(provider.buildAlertBody(endpoint, alert, result, resolved))
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request, err := http.NewRequest(http.MethodPost, provider.WebhookURL, buffer)
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if err != nil {
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return err
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}
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request.Header.Set("Content-Type", "application/json")
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request.Header.Set("Authorization", fmt.Sprintf("Bearer %s", provider.AuthorizationKey))
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response, err := client.GetHTTPClient(nil).Do(request)
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if err != nil {
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return err
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}
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defer response.Body.Close()
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if response.StatusCode > 399 {
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body, _ := io.ReadAll(response.Body)
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return fmt.Errorf("call to provider alert returned status code %d: %s", response.StatusCode, string(body))
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}
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return err
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}
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type AlertBody struct {
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Title string `json:"title,omitempty"` // The title of the alert.
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Description string `json:"description,omitempty"` // A high-level summary of the problem.
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StartTime string `json:"start_time,omitempty"` // The time of the alert. If none is provided, a current time is used.
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EndTime string `json:"end_time,omitempty"` // The resolution time of the alert. If provided, the alert is resolved.
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Service string `json:"service,omitempty"` // The affected service.
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MonitoringTool string `json:"monitoring_tool,omitempty"` // The name of the associated monitoring tool.
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Hosts string `json:"hosts,omitempty"` // One or more hosts, as to where this incident occurred.
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Severity string `json:"severity,omitempty"` // The severity of the alert. Case-insensitive. Can be one of: critical, high, medium, low, info, unknown. Defaults to critical if missing or value is not in this list.
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Fingerprint string `json:"fingerprint,omitempty"` // The unique identifier of the alert. This can be used to group occurrences of the same alert.
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GitlabEnvironmentName string `json:"gitlab_environment_name,omitempty"` // The name of the associated GitLab environment. Required to display alerts on a dashboard.
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}
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func (provider *AlertProvider) monitoringTool() string {
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if len(provider.MonitoringTool) > 0 {
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return provider.MonitoringTool
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}
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return "gatus"
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}
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func (provider *AlertProvider) service(endpoint *core.Endpoint) string {
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if len(provider.Service) > 0 {
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return provider.Service
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}
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return endpoint.DisplayName()
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}
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// buildAlertBody builds the body of the alert
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func (provider *AlertProvider) buildAlertBody(endpoint *core.Endpoint, alert *alert.Alert, result *core.Result, resolved bool) []byte {
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body := AlertBody{
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Title: fmt.Sprintf("alert(%s): %s", provider.monitoringTool(), provider.service(endpoint)),
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StartTime: result.Timestamp.Format(time.RFC3339),
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Service: provider.service(endpoint),
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MonitoringTool: provider.monitoringTool(),
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Hosts: endpoint.URL,
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GitlabEnvironmentName: provider.EnvironmentName,
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Severity: provider.Severity,
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Fingerprint: alert.ResolveKey,
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}
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if resolved {
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body.EndTime = result.Timestamp.Format(time.RFC3339)
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}
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var results string
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for _, conditionResult := range result.ConditionResults {
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var prefix string
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if conditionResult.Success {
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prefix = ":white_check_mark:"
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} else {
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prefix = ":x:"
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}
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results += fmt.Sprintf("- %s - `%s`\n", prefix, conditionResult.Condition)
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}
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var description string
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if alertDescription := alert.GetDescription(); len(alertDescription) > 0 {
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description = ":\n> " + alertDescription
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}
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var message string
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if resolved {
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message = fmt.Sprintf("An alert for *%s* has been resolved after passing successfully %d time(s) in a row", endpoint.DisplayName(), alert.SuccessThreshold)
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} else {
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message = fmt.Sprintf("An alert for *%s* has been triggered due to having failed %d time(s) in a row", endpoint.DisplayName(), alert.FailureThreshold)
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}
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body.Description = message + description + "\n\n## Condition results\n" + results
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json, _ := json.Marshal(body)
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return json
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}
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// GetDefaultAlert returns the provider's default alert configuration
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func (provider AlertProvider) GetDefaultAlert() *alert.Alert {
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return provider.DefaultAlert
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}
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