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development:trap_handling_ticket_creation

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development:trap_handling_ticket_creation [2020/09/29 12:50] – created mmccdevelopment:trap_handling_ticket_creation [2021/06/25 10:09] (current) – external edit 127.0.0.1
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 +=====Trap Handling to Ticket Creation End to End=====
  
 +//Author: Cathal O'Keeffe 2018/11/01//
 +
 +This is a quick overview of the lifecycle of a trap as it goes through the SNMP Manager and becomes a ticket, with references to important classes and methods along the way.
 +
 +
 +====SNMP Manager Distributor Instance====
 +
 +On an SNMP Manager instance assigned as a distributor (see: ''ThreadConfig'' and ''ThreadType'') the ''SnmpDistributor'' class binds to a port (default 162) and listens for any incoming messages. It uses a library created by iReasoning, together with data from the server's MIB files, to parse the trap information. This starts in the ''handleMsg'' method.
 +
 +It then checks the ''IgnoreTrap'' and ''TrapAggregate'' tables to see if received trap should be ignored or aggregated instead of processed now.
 +
 +If neither of those are needed it forwards the trap onto an appropriate handler instance. The first time a particular trap type comes in from a given host it will be sent to the currently least busy handler, and from then on if the same type of trap comes in from the same host it will be sent to the same handler until the ''SnmpDistributorStatisticSet'' is cleared either manually or by restart of the distributor instance.
 +
 +It is sent via ''DatagramSender'' with a default port of 4445.
 +
 +====SNMP Manager Handler Instance====
 +
 +===Queuing & Saving===
 +
 +On the handler the ''DatagramReceiver'' listens for incoming messages (again, default port 4445) and gets passed to the local ''SnmpDistributor'' and then to the ''TrapHandlerPool''. The ''TrapHandlerPool'' finds a read ''TrapHandler'' and adds it to its ''TrapQueue'' while saving the ''Trap'' and ''Varbind'' entries to the database.
 +
 +===Processing===
 +
 +Each ''TrapHandler'' thread will continuously work through any traps in its queue and hand them over to a ''TrapProcessor''. The ''TrapProcessor'' will use the ''CompiledRuleCache'' to retreieve a ''TrapRule'' entry as a closure and runs it, passing in the ''Trap'' domain object.
 +
 +Trap rules are defined and runtime and can do just about anything, but there is a [[onboarding:snmpmanager:trap_rule_template|standard trap rule template]] we use.
 +
 +===Alarm and Ticket Scheduling===
 +
 +Generally the trap rules take the given ''Trap'' object and build a standardised ''GeneralTrapSummary'' from this information and saves it. It then wraps it in a ''GeneralTrapSummaryWrapper'' and tries to find a matching, open ''ActiveAlarm'' for the given ''GeneralTrapSummary''.
 +
 +If it finds an open alarm and the trap is a clear trap then the alarm is cleared and saved. If no alarm exists yet it builds a map of appropriate ticket and form values before calling ''GeneralTrapSummaryWrapper.scheduleAlarmAndTicketForLaterWithForms'' with a ticket creation delay calculated based off severity of the alarm status.
 +
 +''GeneralTrapSummaryWrapper.scheduleAlarmAndTicketForLaterWithForms'' defines a groovy closure and passes into the scheduler to run (usually after 10 seconds) via the ''scheduleAlarmForLater'' method. This closure creates and saves an ''ActiveAlarm'' and defines a second closure that is also passed into the scheduler to be run between fifteen minutes to two hours later depending on the alarm deverity. This second closure calls ''RemoteTicketCreator.openTicketWithForms'' to create a ticket iff the alarm created in the previous closure still exists, hasn't cleared and doesn't already have a ''RemoteTicket'' associated with it.
 +
 +
 +===Ticketing===
 +
 +''RemoteTicketCreator.openTicketWithForms'' creates a new ''RemoteTicketCreationTask'' with all the necessary data and forms and passes it to an ''ExecutorService'' to run. This passes on the ticket information to ''RemoteTaskService.initRemoteTicketProcess'' which uses Java Remote Method Invocation (RMI) to call the ''RemoteTicketSerice'' in the local Ticketer instance, through the ''TicketerInterface'' interface which exists in both the SNMP Manager and Ticketer codebases.

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