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daemon: scaffold Slack notification delivery (#585)
Co-Authored-By: terryz21 <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| package notify | ||
|
|
||
| import ( | ||
| "go.uber.org/multierr" | ||
| ) | ||
|
|
||
| // Notifiers is a collection of notification targets | ||
| type Notifiers []Notifier | ||
|
|
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| // Notify delivers a notification to all targets | ||
| func (n Notifiers) Notify(msg string, opts Options) error { | ||
| if len(n) == 0 { | ||
| return nil | ||
| } | ||
|
|
||
| var errs error | ||
| for _, notif := range n { | ||
| errs = multierr.Append(errs, notif.Notify(msg, opts)) | ||
| } | ||
| return errs | ||
| } | ||
|
|
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| // Notifier manages notifications | ||
| type Notifier interface { | ||
| Notify(string, Options) error | ||
| } | ||
|
|
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| // Options is used to configure formatting of notifications | ||
| type Options struct { | ||
| Color Color | ||
| } | ||
|
|
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| // Color is used to represent message color for different states (i.e success, fail) | ||
| type Color string | ||
|
|
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| const ( | ||
| // Green for success messages | ||
| Green Color = "good" | ||
| // Yellow for warning messages | ||
| Yellow Color = "warning" | ||
| // Red for error messages | ||
| Red Color = "danger" | ||
| ) | ||
|
|
||
| // MessageArray builds the json message to be posted to webhook | ||
| type MessageArray struct { | ||
| Attachments []Message `json:"attachments"` | ||
| } | ||
|
|
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| // Message builds the attachments content of Message | ||
| type Message struct { | ||
| Text string `json:"text"` | ||
| Color string `json:"color"` | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| package notify | ||
|
|
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| import ( | ||
| "bytes" | ||
| "encoding/json" | ||
| "errors" | ||
| "fmt" | ||
| "io/ioutil" | ||
| "net/http" | ||
| ) | ||
|
|
||
| // SlackNotifier represents slack notifications | ||
| type SlackNotifier struct { | ||
| hookURL string | ||
| } | ||
|
|
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| // NewSlackNotifier creates a notifier with web hook url to slack channel. Passing | ||
| // it an empty url makes it a no-op notifier. | ||
| func NewSlackNotifier(webhookURL string) Notifier { | ||
| return &SlackNotifier{ | ||
| hookURL: webhookURL, | ||
| } | ||
| } | ||
|
|
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| // Notify sends the notification | ||
| func (n *SlackNotifier) Notify(text string, options Options) error { | ||
| if n.hookURL == "" { | ||
| return nil | ||
| } | ||
|
|
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| b, err := json.Marshal(MessageArray{ | ||
| Attachments: []Message{ | ||
| { | ||
| Text: fmt.Sprintf("*%s*", text), | ||
| Color: colorToString(options.Color), | ||
| }, | ||
| }, | ||
| }) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to encode request: %w", err) | ||
| } | ||
|
|
||
| resp, err := http.Post(n.hookURL, "application/json", bytes.NewBuffer(b)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer resp.Body.Close() | ||
|
|
||
| body, err := ioutil.ReadAll(resp.Body) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to read response body: %w", err) | ||
| } | ||
| if resp.StatusCode < 200 || resp.StatusCode > 299 { | ||
| return errors.New("http request rejected by Slack: " + string(body)) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func colorToString(color Color) string { | ||
| return string(color) | ||
| } |
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