nielsperetzke
/
healthchecks


								# coding: utf-8


								import hashlib

								import json

								import time

								import uuid

								from datetime import datetime, timedelta as td


								from croniter import croniter

								from django.conf import settings

								from django.contrib.auth.models import User

								from django.db import models

								from django.urls import reverse

								from django.utils import timezone

								from hc.api import transports

								from hc.lib import emails

								import requests


								STATUSES = (

								    ("up", "Up"),

								    ("down", "Down"),

								    ("new", "New"),

								    ("paused", "Paused")

								)

								DEFAULT_TIMEOUT = td(days=1)

								DEFAULT_GRACE = td(hours=1)

								CHECK_KINDS = (("simple", "Simple"),

								               ("cron", "Cron"))


								CHANNEL_KINDS = (("email", "Email"),

								                 ("webhook", "Webhook"),

								                 ("hipchat", "HipChat"),

								                 ("slack", "Slack"),

								                 ("pd", "PagerDuty"),

								                 ("pagertree", "PagerTree"),

								                 ("po", "Pushover"),

								                 ("pushbullet", "Pushbullet"),

								                 ("opsgenie", "OpsGenie"),

								                 ("victorops", "VictorOps"),

								                 ("discord", "Discord"),

								                 ("telegram", "Telegram"),

								                 ("sms", "SMS"),

								                 ("zendesk", "Zendesk"))


								PO_PRIORITIES = {

								    -2: "lowest",

								    -1: "low",

								    0: "normal",

								    1: "high",

								    2: "emergency"

								}


								def isostring(dt):

								    """Convert the datetime to ISO 8601 format with no microseconds. """

								    return dt.replace(microsecond=0).isoformat()


								class Check(models.Model):

								    name = models.CharField(max_length=100, blank=True)

								    tags = models.CharField(max_length=500, blank=True)

								    code = models.UUIDField(default=uuid.uuid4, editable=False, db_index=True)

								    desc = models.TextField(blank=True)

								    user = models.ForeignKey(User, models.CASCADE, blank=True, null=True)

								    created = models.DateTimeField(auto_now_add=True)

								    kind = models.CharField(max_length=10, default="simple",

								                            choices=CHECK_KINDS)

								    timeout = models.DurationField(default=DEFAULT_TIMEOUT)

								    grace = models.DurationField(default=DEFAULT_GRACE)

								    schedule = models.CharField(max_length=100, default="* * * * *")

								    tz = models.CharField(max_length=36, default="UTC")

								    n_pings = models.IntegerField(default=0)

								    last_ping = models.DateTimeField(null=True, blank=True)

								    last_ping_was_fail = models.NullBooleanField(default=False)

								    has_confirmation_link = models.BooleanField(default=False)

								    alert_after = models.DateTimeField(null=True, blank=True, editable=False)

								    status = models.CharField(max_length=6, choices=STATUSES, default="new")


								    def name_then_code(self):

								        if self.name:

								            return self.name


								        return str(self.code)


								    def url(self):

								        return settings.PING_ENDPOINT + str(self.code)


								    def details_url(self):

								        return settings.SITE_ROOT + reverse("hc-details", args=[self.code])


								    def email(self):

								        return "%s@%s" % (self.code, settings.PING_EMAIL_DOMAIN)


								    def send_alert(self):

								        if self.status not in ("up", "down"):

								            raise NotImplementedError("Unexpected status: %s" % self.status)


								        errors = []

								        for channel in self.channel_set.all():

								            error = channel.notify(self)

								            if error not in ("", "no-op"):

								                errors.append((channel, error))


								        return errors


								    def get_grace_start(self):

								        """ Return the datetime when grace period starts. """


								        # The common case, grace starts after timeout

								        if self.kind == "simple":

								            return self.last_ping + self.timeout


								        # The complex case, next ping is expected based on cron schedule

								        with timezone.override(self.tz):

								            last_naive = timezone.make_naive(self.last_ping)

								            it = croniter(self.schedule, last_naive)

								            next_naive = it.get_next(datetime)

								            return timezone.make_aware(next_naive, is_dst=False)


								    def get_status(self, now=None):

								        """ Return "up" if the check is up or in grace, otherwise "down". """


								        if self.status in ("new", "paused"):

								            return self.status


								        if self.last_ping_was_fail:

								            return "down"


								        if now is None:

								            now = timezone.now()


								        grace_start = self.get_grace_start()

								        grace_end = grace_start + self.grace

								        if now >= grace_end:

								            return "down"


								        if now >= grace_start:

								            return "grace"


								        return "up"


								    def get_alert_after(self):

								        """ Return the datetime when check potentially goes down. """


								        # For "fail" pings, sendalerts should the check right

								        # after receiving the ping, without waiting for the grace time:

								        if self.last_ping_was_fail:

								            return self.last_ping


								        return self.get_grace_start() + self.grace


								    def assign_all_channels(self):

								        if self.user:

								            channels = Channel.objects.filter(user=self.user)

								            self.channel_set.add(*channels)


								    def tags_list(self):

								        return [t.strip() for t in self.tags.split(" ") if t.strip()]


								    def matches_tag_set(self, tag_set):

								        return tag_set.issubset(self.tags_list())


								    def to_dict(self):

								        update_rel_url = reverse("hc-api-update", args=[self.code])

								        pause_rel_url = reverse("hc-api-pause", args=[self.code])


								        result = {

								            "name": self.name,

								            "ping_url": self.url(),

								            "update_url": settings.SITE_ROOT + update_rel_url,

								            "pause_url": settings.SITE_ROOT + pause_rel_url,

								            "tags": self.tags,

								            "grace": int(self.grace.total_seconds()),

								            "n_pings": self.n_pings,

								            "status": self.get_status()

								        }


								        if self.kind == "simple":

								            result["timeout"] = int(self.timeout.total_seconds())

								        elif self.kind == "cron":

								            result["schedule"] = self.schedule

								            result["tz"] = self.tz


								        if self.last_ping:

								            result["last_ping"] = isostring(self.last_ping)

								            result["next_ping"] = isostring(self.get_grace_start())

								        else:

								            result["last_ping"] = None

								            result["next_ping"] = None


								        return result


								    def ping(self, remote_addr, scheme, method, ua, body, is_fail=False):

								        self.n_pings = models.F("n_pings") + 1

								        self.last_ping = timezone.now()

								        self.last_ping_was_fail = is_fail

								        self.has_confirmation_link = "confirm" in str(body).lower()

								        self.alert_after = self.get_alert_after()

								        if self.status in ("new", "paused"):

								            self.status = "up"


								        self.save()

								        self.refresh_from_db()


								        ping = Ping(owner=self)

								        ping.n = self.n_pings

								        ping.fail = is_fail

								        ping.remote_addr = remote_addr

								        ping.scheme = scheme

								        ping.method = method

								        # If User-Agent is longer than 200 characters, truncate it:

								        ping.ua = ua[:200]

								        ping.body = body[:10000]

								        ping.save()


								class Ping(models.Model):

								    id = models.BigAutoField(primary_key=True)

								    n = models.IntegerField(null=True)

								    owner = models.ForeignKey(Check, models.CASCADE)

								    created = models.DateTimeField(auto_now_add=True)

								    fail = models.NullBooleanField(default=False)

								    scheme = models.CharField(max_length=10, default="http")

								    remote_addr = models.GenericIPAddressField(blank=True, null=True)

								    method = models.CharField(max_length=10, blank=True)

								    ua = models.CharField(max_length=200, blank=True)

								    body = models.CharField(max_length=10000, blank=True, null=True)


								class Channel(models.Model):

								    code = models.UUIDField(default=uuid.uuid4, editable=False)

								    user = models.ForeignKey(User, models.CASCADE)

								    created = models.DateTimeField(auto_now_add=True)

								    kind = models.CharField(max_length=20, choices=CHANNEL_KINDS)

								    value = models.TextField(blank=True)

								    email_verified = models.BooleanField(default=False)

								    checks = models.ManyToManyField(Check)


								    def __str__(self):

								        if self.kind == "email":

								            return "Email to %s" % self.value

								        elif self.kind == "sms":

								            if self.sms_label:

								                return "SMS to %s" % self.sms_label

								            return "SMS to %s" % self.sms_number

								        elif self.kind == "slack":

								            return "Slack %s" % self.slack_channel

								        elif self.kind == "telegram":

								            return "Telegram %s" % self.telegram_name


								        return self.get_kind_display()


								    def assign_all_checks(self):

								        checks = Check.objects.filter(user=self.user)

								        self.checks.add(*checks)


								    def make_token(self):

								        seed = "%s%s" % (self.code, settings.SECRET_KEY)

								        seed = seed.encode()

								        return hashlib.sha1(seed).hexdigest()


								    def send_verify_link(self):

								        args = [self.code, self.make_token()]

								        verify_link = reverse("hc-verify-email", args=args)

								        verify_link = settings.SITE_ROOT + verify_link

								        emails.verify_email(self.value, {"verify_link": verify_link})


								    def get_unsub_link(self):

								        args = [self.code, self.make_token()]

								        verify_link = reverse("hc-unsubscribe-alerts", args=args)

								        return settings.SITE_ROOT + verify_link


								    @property

								    def transport(self):

								        if self.kind == "email":

								            return transports.Email(self)

								        elif self.kind == "webhook":

								            return transports.Webhook(self)

								        elif self.kind == "slack":

								            return transports.Slack(self)

								        elif self.kind == "hipchat":

								            return transports.HipChat(self)

								        elif self.kind == "pd":

								            return transports.PagerDuty(self)

								        elif self.kind == "pagertree":

								            return transports.PagerTree(self)

								        elif self.kind == "victorops":

								            return transports.VictorOps(self)

								        elif self.kind == "pushbullet":

								            return transports.Pushbullet(self)

								        elif self.kind == "po":

								            return transports.Pushover(self)

								        elif self.kind == "opsgenie":

								            return transports.OpsGenie(self)

								        elif self.kind == "discord":

								            return transports.Discord(self)

								        elif self.kind == "telegram":

								            return transports.Telegram(self)

								        elif self.kind == "sms":

								            return transports.Sms(self)

								        elif self.kind == "zendesk":

								            return transports.Zendesk(self)

								        else:

								            raise NotImplementedError("Unknown channel kind: %s" % self.kind)


								    def notify(self, check):

								        if self.transport.is_noop(check):

								            return "no-op"


								        n = Notification(owner=check, channel=self)

								        n.check_status = check.status

								        n.error = "Sending"

								        n.save()


								        if self.kind == "email":

								            error = self.transport.notify(check, n.bounce_url()) or ""

								        else:

								            error = self.transport.notify(check) or ""


								        n.error = error

								        n.save()


								        return error


								    @property

								    def po_value(self):

								        assert self.kind == "po"

								        user_key, prio = self.value.split("|")

								        prio = int(prio)

								        return user_key, prio, PO_PRIORITIES[prio]


								    @property

								    def url_down(self):

								        assert self.kind == "webhook"

								        if not self.value.startswith("{"):

								            parts = self.value.split("\n")

								            return parts[0]


								        doc = json.loads(self.value)

								        return doc.get("url_down")


								    @property

								    def url_up(self):

								        assert self.kind == "webhook"

								        if not self.value.startswith("{"):

								            parts = self.value.split("\n")

								            return parts[1] if len(parts) > 1 else ""


								        doc = json.loads(self.value)

								        return doc.get("url_up")


								    @property

								    def post_data(self):

								        assert self.kind == "webhook"

								        if not self.value.startswith("{"):

								            parts = self.value.split("\n")

								            return parts[2] if len(parts) > 2 else ""


								        doc = json.loads(self.value)

								        return doc.get("post_data")


								    @property

								    def headers(self):

								        assert self.kind == "webhook"

								        if not self.value.startswith("{"):

								            return {}


								        doc = json.loads(self.value)

								        return doc.get("headers", {})


								    @property

								    def slack_team(self):

								        assert self.kind == "slack"

								        if not self.value.startswith("{"):

								            return None


								        doc = json.loads(self.value)

								        return doc["team_name"]


								    @property

								    def slack_channel(self):

								        assert self.kind == "slack"

								        if not self.value.startswith("{"):

								            return None


								        doc = json.loads(self.value)

								        return doc["incoming_webhook"]["channel"]


								    @property

								    def slack_webhook_url(self):

								        assert self.kind == "slack"

								        if not self.value.startswith("{"):

								            return self.value


								        doc = json.loads(self.value)

								        return doc["incoming_webhook"]["url"]


								    @property

								    def discord_webhook_url(self):

								        assert self.kind == "discord"

								        doc = json.loads(self.value)

								        return doc["webhook"]["url"]


								    @property

								    def discord_webhook_id(self):

								        assert self.kind == "discord"

								        doc = json.loads(self.value)

								        return doc["webhook"]["id"]


								    @property

								    def telegram_id(self):

								        assert self.kind == "telegram"

								        doc = json.loads(self.value)

								        return doc.get("id")


								    @property

								    def telegram_type(self):

								        assert self.kind == "telegram"

								        doc = json.loads(self.value)

								        return doc.get("type")


								    @property

								    def telegram_name(self):

								        assert self.kind == "telegram"

								        doc = json.loads(self.value)

								        return doc.get("name")


								    def refresh_hipchat_access_token(self):

								        assert self.kind == "hipchat"

								        if not self.value.startswith("{"):

								            return  # Don't have OAuth credentials


								        doc = json.loads(self.value)

								        if time.time() < doc.get("expires_at", 0):

								            return  # Current access token is still valid


								        url = "https://api.hipchat.com/v2/oauth/token"

								        auth = (doc["oauthId"], doc["oauthSecret"])

								        r = requests.post(url, auth=auth, data={

								            "grant_type": "client_credentials",

								            "scope": "send_notification"

								        })


								        doc.update(r.json())

								        doc["expires_at"] = int(time.time()) + doc["expires_in"] - 300

								        self.value = json.dumps(doc)

								        self.save()


								    @property

								    def hipchat_webhook_url(self):

								        assert self.kind == "hipchat"

								        if not self.value.startswith("{"):

								            return self.value


								        doc = json.loads(self.value)

								        tmpl = "https://api.hipchat.com/v2/room/%s/notification?auth_token=%s"

								        return tmpl % (doc["roomId"], doc.get("access_token"))


								    @property

								    def pd_service_key(self):

								        assert self.kind == "pd"

								        if not self.value.startswith("{"):

								            return self.value


								        doc = json.loads(self.value)

								        return doc["service_key"]


								    @property

								    def pd_account(self):

								        assert self.kind == "pd"

								        if self.value.startswith("{"):

								            doc = json.loads(self.value)

								            return doc["account"]


								    @property

								    def zendesk_token(self):

								        assert self.kind == "zendesk"

								        doc = json.loads(self.value)

								        return doc["access_token"]


								    @property

								    def zendesk_subdomain(self):

								        assert self.kind == "zendesk"

								        doc = json.loads(self.value)

								        return doc["subdomain"]


								    def latest_notification(self):

								        return Notification.objects.filter(channel=self).latest()


								    @property

								    def sms_number(self):

								        assert self.kind == "sms"

								        if self.value.startswith("{"):

								            doc = json.loads(self.value)

								            return doc["value"]

								        return self.value


								    @property

								    def sms_label(self):

								        assert self.kind == "sms"

								        if self.value.startswith("{"):

								            doc = json.loads(self.value)

								            return doc["label"]


								class Notification(models.Model):

								    class Meta:

								        get_latest_by = "created"


								    code = models.UUIDField(default=uuid.uuid4, null=True, editable=False)

								    owner = models.ForeignKey(Check, models.CASCADE)

								    check_status = models.CharField(max_length=6)

								    channel = models.ForeignKey(Channel, models.CASCADE)

								    created = models.DateTimeField(auto_now_add=True)

								    error = models.CharField(max_length=200, blank=True)


								    def bounce_url(self):

								        return settings.SITE_ROOT + reverse("hc-api-bounce", args=[self.code])