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127 lines
3.6 KiB
Lua
127 lines
3.6 KiB
Lua
--
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-- (C) 2018 - ntop.org
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--
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require "lua_utils"
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local json = require "dkjson"
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local alert_utils = require "alert_utils"
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local alert_consts = require "alert_consts"
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local syslog = {
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name = "Syslog",
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conf_max_num = 1, -- At most 1 endpoint
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conf_params = {
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{ param_name = "syslog_alert_format" },
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},
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conf_template = {
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plugin_key = "syslog_alert_endpoint",
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template_name = "syslog_endpoint.template"
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},
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recipient_params = {
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},
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recipient_template = {
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plugin_key = "syslog_alert_endpoint",
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template_name = "syslog_recipient.template" -- TODO: add template
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},
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}
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-- syslog.DEFAULT_SEVERITY = "info"
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syslog.EXPORT_FREQUENCY = 1 -- 1 second, i.e., as soon as possible
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syslog.prio = 300
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-- ##############################################
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function syslog.isAvailable()
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return(ntop.syslog ~= nil)
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end
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-- ##############################################
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function syslog.sendMessage(notif, severity, syslog_format)
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local syslog_severity = alert_consts.alertLevelToSyslogLevel(severity)
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local msg
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if syslog_format and syslog_format == "json" then
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-- send out the json message but prepare a nice
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-- message
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notif.message = alert_utils.formatAlertNotification(notif, {
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nohtml = true,
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show_severity = false,
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show_entity = false})
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msg = json.encode(notif)
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else -- syslog_format == "plaintext"
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-- prepare a plaintext message
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msg = alert_utils.formatAlertNotification(notif, {
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nohtml = true,
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show_severity = true,
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show_entity = true})
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end
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ntop.syslog(msg, syslog_severity)
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return true
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end
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-- ##############################################
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-- Dequeue alerts from a recipient queue for sending notifications
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function syslog.dequeueRecipientAlerts(recipient, budget, high_priority)
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local notifications = {}
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for i = 1, budget do
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local notification = ntop.recipient_dequeue(recipient.recipient_id, high_priority)
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if notification then
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notifications[#notifications + 1] = notification
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else
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break
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end
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end
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if not notifications or #notifications == 0 then
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return {success = true, more_available = false}
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end
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-- Separate by severity and channel
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local alerts_by_types = {}
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for _, json_message in ipairs(notifications) do
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local notif = json.decode(json_message)
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if notif.alert_entity then
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alerts_by_types[notif.alert_entity] = alerts_by_types[notif.alert_entity] or {}
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alerts_by_types[notif.alert_entity][notif.alert_severity] = alerts_by_types[notif.alert_entity][notif.alert_severity] or {}
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table.insert(alerts_by_types[notif.alert_entity][notif.alert_severity], notif)
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end
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end
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for _, by_severity in pairs(alerts_by_types) do
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for severity, sev_notifications in pairs(by_severity) do
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severity = alert_consts.alertSeverityRaw(severity)
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-- Most recent notifications first
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for _, notif in pairsByValues(sev_notifications, alert_utils.notification_timestamp_rev) do
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syslog.sendMessage(notif, severity, recipient.endpoint_conf.syslog_alert_format)
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end
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end
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end
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return {success = true, more_available = true}
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end
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-- ##############################################
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function syslog.runTest(recipient)
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local now = os.time()
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local notif = {
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alert_tstamp = now,
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alert_entity = alert_consts.alert_entities.test.entity_id,
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}
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local success = syslog.sendMessage(notif, "info", recipient.endpoint_conf.syslog_alert_format)
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local message_info = i18n("prefs.syslog_sent_successfully")
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return success, message_info
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end
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-- ##############################################
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return syslog
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