#!/usr/bin/python

import time
import urllib3
import json
from systemd import journal

urllib3.disable_warnings()
http = urllib3.PoolManager()

webhook_url = "<%= @slack_logger %>"
webhook_username = "<%= @slack_logger_username %>"

# These icons are made by CSSCREME.COM
# http://csscreme.com/freeicons/
# License: GNU (GENERAL PUBLIC LICENSE)
webhook_icon = "https://release.immae.eu/logger.png"

priorities = {
        0: "0",        # black
        1: "6684672",  # dark dark red
        2: "13369344", # dark red
        3: "16711680", # red
        4: "16737792", # orange
        5: "3407616",  # green
        6: "255",      # blue
        7: "16777215", # white
        }

def send_to_discord(messages):
    def send_chunk(chunk, priority, fields=None):
        data = {
                "avatar_url": webhook_icon,
                "username": webhook_username,
                "embeds": [
                    {
                        "description": "```\n{}\n```".format(chunk[0:2000]),
                        "color": priorities[priority],
                        "fields": [],
                        }
                    ],
                }
        if fields is not None:
            data["content"] = "@everyone"

            for field in ["CLIENT_IP", "PATH", "METHOD", "STATUS_CODE", "USER_ID", "FLAG", "LATENCY"]:
                value = fields.get(field)
                if value is not None:
                    data["embeds"][-1]["fields"].append({
                        "name": field.replace("_", " ").capitalize(),
                        "value": value,
                        "inline": True,
                        })

        encoded = json.dumps(data).encode('utf-8')

        r = http.request("POST", webhook_url,
                headers={'Content-Type': 'application/json'},
                body=encoded)
        if r.status == 429:
            b = json.loads(r.data)
            time.sleep(b["retry_after"] / 900)
            r = http.request("POST", webhook_url,
                    headers={'Content-Type': 'application/json'},
                    body=encoded)
        if r.status >= 300:
            print("Error when sending message: {}".format(r.status))

    chunk = ""
    priority = ""
    for message in messages:
        m_priority = int(message.get("PRIORITY", 5))
        if m_priority > 6:
            continue

        if len(chunk) > 0 and m_priority != priority:
            send_chunk(chunk, priority)
            chunk = ""

        if m_priority <= 4:
            send_chunk(message["MESSAGE"], m_priority, fields=message)
        else:
            priority = m_priority

            if "SYSLOG_IDENTIFIER" in message:
                line = "[{}] {}".format(message["SYSLOG_IDENTIFIER"], message["MESSAGE"])
            else:
                line = message["MESSAGE"]
            if len(line) + len(chunk) > 2000 - 17:
                send_chunk(chunk, priority)
                chunk = line
            else:
                chunk += "\n" + line
    if len(chunk) > 0:
        send_chunk(chunk, priority)

j = journal.Reader()
j.add_match(_SYSTEMD_UNIT="cryptoportfolio-app.service")
j.add_disjunction()
j.add_match(UNIT="cryptoportfolio-app.service")
j.seek_tail()
list(j)

while True:
    lines = list(j)
    if len(lines) > 0:
        send_to_discord(lines)
    time.sleep(5)
    j.wait()