from django.conf import settings from django.template.loader import render_to_string from django.utils import timezone import json import requests from six.moves.urllib.parse import quote from hc.lib import emails def tmpl(template_name, **ctx): template_path = "integrations/%s" % template_name return render_to_string(template_path, ctx).strip() class Transport(object): def __init__(self, channel): self.channel = channel def notify(self, check): """ Send notification about current status of the check. This method returns None on success, and error message on error. """ raise NotImplementedError() def is_noop(self, check): """ Return True if transport will ignore check's current status. This method is overriden in Webhook subclass where the user can configure webhook urls for "up" and "down" events, and both are optional. """ return False def checks(self): return self.channel.user.check_set.order_by("created") class Email(Transport): def notify(self, check, bounce_url): if not self.channel.email_verified: return "Email not verified" headers = {"X-Bounce-Url": bounce_url} ctx = { "check": check, "checks": self.checks(), "now": timezone.now(), "unsub_link": self.channel.get_unsub_link() } emails.alert(self.channel.value, ctx, headers) class HttpTransport(Transport): def _request(self, method, url, **kwargs): try: options = dict(kwargs) if "headers" not in options: options["headers"] = {} options["timeout"] = 5 options["headers"]["User-Agent"] = "healthchecks.io" r = requests.request(method, url, **options) if r.status_code not in (200, 201, 204): return "Received status code %d" % r.status_code except requests.exceptions.Timeout: # Well, we tried return "Connection timed out" except requests.exceptions.ConnectionError: return "Connection failed" def get(self, url): # Make 3 attempts-- for x in range(0, 3): error = self._request("get", url) if error is None: break return error def post(self, url, **kwargs): # Make 3 attempts-- for x in range(0, 3): error = self._request("post", url, **kwargs) if error is None: break return error class Webhook(HttpTransport): def prepare(self, template, check, urlencode=False): """ Replace variables with actual values. There should be no bad translations if users use $ symbol in check's name or tags, because $ gets urlencoded to %24 """ def safe(s): return quote(s) if urlencode else s result = template if "$CODE" in result: result = result.replace("$CODE", str(check.code)) if "$STATUS" in result: result = result.replace("$STATUS", check.status) if "$NOW" in result: s = timezone.now().replace(microsecond=0).isoformat() result = result.replace("$NOW", safe(s)) if "$NAME" in result: result = result.replace("$NAME", safe(check.name)) if "$TAG" in result: for i, tag in enumerate(check.tags_list()): placeholder = "$TAG%d" % (i + 1) result = result.replace(placeholder, safe(tag)) return result def is_noop(self, check): if check.status == "down" and not self.channel.value_down: return True if check.status == "up" and not self.channel.value_up: return True return False def notify(self, check): url = self.channel.value_down if check.status == "up": url = self.channel.value_up assert url url = self.prepare(url, check, urlencode=True) if self.channel.post_data: payload = self.prepare(self.channel.post_data, check) return self.post(url, data=payload) else: return self.get(url) class Slack(HttpTransport): def notify(self, check): text = tmpl("slack_message.json", check=check) payload = json.loads(text) return self.post(self.channel.slack_webhook_url, json=payload) class HipChat(HttpTransport): def notify(self, check): text = tmpl("hipchat_message.html", check=check) payload = { "message": text, "color": "green" if check.status == "up" else "red", } return self.post(self.channel.value, json=payload) class OpsGenie(HttpTransport): def notify(self, check): payload = { "apiKey": self.channel.value, "alias": str(check.code), "source": "healthchecks.io" } if check.status == "down": payload["tags"] = ",".join(check.tags_list()) payload["message"] = tmpl("opsgenie_message.html", check=check) payload["note"] = tmpl("opsgenie_note.html", check=check) url = "https://api.opsgenie.com/v1/json/alert" if check.status == "up": url += "/close" return self.post(url, json=payload) class PagerDuty(HttpTransport): URL = "https://events.pagerduty.com/generic/2010-04-15/create_event.json" def notify(self, check): description = tmpl("pd_description.html", check=check) payload = { "service_key": self.channel.value, "incident_key": str(check.code), "event_type": "trigger" if check.status == "down" else "resolve", "description": description, "client": "healthchecks.io", "client_url": settings.SITE_ROOT } return self.post(self.URL, json=payload) class Pushbullet(HttpTransport): def notify(self, check): text = tmpl("pushbullet_message.html", check=check) url = "https://api.pushbullet.com/v2/pushes" headers = { "Access-Token": self.channel.value, "Conent-Type": "application/json" } payload = { "type": "note", "title": "healthchecks.io", "body": text } return self.post(url, json=payload, headers=headers) class Pushover(HttpTransport): URL = "https://api.pushover.net/1/messages.json" def notify(self, check): others = self.checks().filter(status="down").exclude(code=check.code) ctx = { "check": check, "down_checks": others, } text = tmpl("pushover_message.html", **ctx) title = tmpl("pushover_title.html", **ctx) user_key, prio = self.channel.value.split("|") payload = { "token": settings.PUSHOVER_API_TOKEN, "user": user_key, "message": text, "title": title, "html": 1, "priority": int(prio), } # Emergency notification if prio == "2": payload["retry"] = settings.PUSHOVER_EMERGENCY_RETRY_DELAY payload["expire"] = settings.PUSHOVER_EMERGENCY_EXPIRATION return self.post(self.URL, data=payload) class VictorOps(HttpTransport): def notify(self, check): description = tmpl("victorops_description.html", check=check) mtype = "CRITICAL" if check.status == "down" else "RECOVERY" payload = { "entity_id": str(check.code), "message_type": mtype, "entity_display_name": check.name_then_code(), "state_message": description, "monitoring_tool": "healthchecks.io", } return self.post(self.channel.value, json=payload) class Discord(HttpTransport): def notify(self, check): text = tmpl("slack_message.json", check=check) payload = json.loads(text) url = self.channel.discord_webhook_url + "/slack" return self.post(url, json=payload)