DbCorbaClient SamApi - PowerPoint PPT Presentation

Title: DbCorbaClient SamApi


1
DbCorbaClient / SamApi

• (or, what I did on my Thanksgiving vacation...)
• Lauri Loebel Carpenter
• 10 December 2002

2
DbCorbaClient / SamApi

• What dbServer does now
• difficulties being addressed
• hopeful outcomes
• New approach
• what the new packages do
• what the client code is enabled to do
• Specific use cases
• SamApiCore, SamApiClient
• other potential uses...
• Still needs...

3
Take one SAM database...

• Database Tables
• SQLgt describe stations
• Name Null?
  Type
• -----------------------------------------
  -------- ----------------------------
• STATION_ID NOT NULL
  NUMBER(38)
• STATION_NAME NOT NULL
  VARCHAR2(50)
• CREATE_DATE NOT NULL DATE
• CREATE_USER NOT NULL
  VARCHAR2(50)
• UPDATE_DATE
  DATE
• UPDATE_USER
  VARCHAR2(50)
• STATION_DESC
  VARCHAR2(4000)
• LIFE_CYCLE_STATUS_ID
  NUMBER(38)
• STATION_MONITOR_LEVEL_ID NUMBER(38)

4
add a pinch of oracleParser...

• DictStations.py
• dict
• 'aspects' 'cppname' '_lifeCycleStatusId',
• 'dbname' 'LIFE_CYCLE_STATUS_
  ID',
• 'dbtype' 'number',
• 'desc' 0,
• 'duplicate' 0,
• 'id' 0,
• 'idltype' 'long',
• 'ooname' 'lifeCycleStatusId'
  ,
• 'queryable' 1,
• 'cppname'
  '_stationMonitorLevelId',
• 'dbname' 'STATION_MONITOR_LE
  VEL_ID',
• 'dbtype' 'number',
• 'desc' 0,
• 'duplicate' 0,
• 'id' 0,
• 'idltype' 'long',
• 'ooname' 'stationMonitorLeve
  lId',

5
and a dash of Dict_Modifier...

• dictModifiers
• 'AnalysisProjects'
• 'dbname'
• 'start_time' 'dbtype'
  'datetime' ,
• 'project_desc' 'dbcase'
  'mixed' ,
• 'end_time' 'dbtype'
  'datetime'
• ,
• ...
• 'Stations'
• 'dbname'
• 'station_desc' 'dbcase'
  'mixed'
• ,
• ...

6
Combine thoroughly with dbgen

• Voila DbStations.py

class DbStations def getOne(self,
theColumnList, theWhereDict, forUpdate0,
rollback1) ... def get(self,
theColumnList, theWhereDict, minrows0,
maxrows0, forUpdate0, rollback1,
orderList, limit0) ...
(..also methods to query and getAttrList).
7
SAMDbServer Primitives
8
Problem IDL Layer

• // Struct to pass back requests
• struct RequestInfo
• unsigned long requestId
• string requestStatus
• string createDate
• string createUser
• unsigned long jobName
• typedef sequenceltRequestInfogt
  RequestInfoList
• // Struct to pass back requests
• struct FullRequestInfo
• unsigned long requestId
• string requestStatus
• string workGroupName
• string userName
• unsigned long numberOfEvents
• string comments
• unsigned long priority
• string email

Too Complicated!
9
Very specific methods/structures

• Slow turnaround time for developing queries
• new dbServer method,
• new IDL interface,
• new SAMCommon
• d0ora1 is making logic decisions about what to
  do with the data
• fnorb is not good at marshalling/ unmarshalling
  complicated structures (very slow)

10
Need a way to pass arbitrary structures
User whatever server.get(something)
IDL Happens HERE
Server whatever internals.return(something
) or raise NoCanDo
Without having to know the exact structure and
content of WHAT you know and what you WANT to
know when you define the IDL.
11
Hence DbCorbaClient layer

• Very simple interface for client code to do
  arbitrary get, getOne, query.
• Request is handled by the DbServer
• no oracleClient required on client end
• IDL interface remains CONSTANT, does not need to
  be changed!
• All done via an IDL Dictionary (or
  DictionaryList) structure of CorbaAny values.

12
At the heart corbaDictionary

• corbaDictionary( pyDict ) converts to
  IDL list of SAMAttrValue pairs
• corbaDictionary( IDLList ) converts to pyDict
• Handles the python None value internally
• DbCorbaClient will return None values!

13
Example

• Code
• !/usr/bin/env python
• import DbCorbaClient
• s DbCorbaClient.DbCorbaClient(DbStations)
  maps directly to DbStations.py
• print s.getAttrList()
  maps directly to Dict
  aspects
• print s.get( stationId, stationName,
• stationName oper
  like ana )
• print s.getOne( , stationName
  central-analysis )
• print s.query( select station_name from
  stations where \
• station_id in
  (1,2,3,4,5))
• Output
• 'lifeCycleStatusId', 'stationMonitorLevelId',
  'stationId', 'stationName', 'createDate',
  'createUser', 'updateDate', 'updateUser',
  'stationDesc'
• 9, 'big_smp_analysis_server', 1163,
  'central-analysis', 1353, 'linux-analysis-cluste
  r-1', 2003, 'ccin2p3-analysis'
• 1, 2, 1163, 'central-analysis', '10/19/1999',
  'wellner', '10/29/2002', 'lauri', 'D0MINO'
• 'station1', 'im', 'station3',
  'station4', 'station5'

14
Return format PY_DICT_FORMAT

• Default return format mimics the lists returned
  by get/getOne/query within the dbServer
• Optional PY_DICT_FORMAT can be used to return
  data as dictionaries instead of lists.

15
PY_DICT_FORMAT example

• Code
• !/usr/bin/env python
• import DbCorbaClient
• s DbCorbaClient.DbCorbaClient(DbStations,
  
  returnFormatDbCorbaClient.PY_DICT_FORMAT)
• print s.getAttrList()
• print s.get( stationId, stationName,
• stationName oper
  like ana )
• print s.getOne( , stationName
  central-analysis )
• Output
• 'lifeCycleStatusId', 'stationMonitorLevelId',
  'stationId', 'stationName', 'createDate',
  'createUser', 'updateDate', 'updateUser',
  'stationDesc'
• 'stationId' 9, 'stationName'
  'big_smp_analysis_server', 'stationId' 1163,
  'stationName' 'central-analysis', 'stationId'
  1353, 'stationName' 'linux-analysis-cluster-1',
  'stationId' 2003, 'stationName'
  'ccin2p3-analysis'
• 'createDate' '10/19/1999', 'stationMonitorLevel
  Id' 2, 'lifeCycleStatusId' 1, 'createUser'
  'wellner', 'stationName' 'central-analysis',
  'updateDate' '10/29/2002', 'stationDesc'
  'D0MINO', 'stationId' 1163, 'updateUser'
  'lauri'

16
This is the REAL POWER

• We know how to pass arbitrarily complex python
  Dictionary Structures through CORBA.
• Using this, clients can now generate their own
  queries on the SAM data without requiring a new
  dbServer method for each and every one.
• corbaDictionary (from sam_common) encapsulates
  all of the complication of packing/unpacking the
  data to/from IDL

17
Bottom Line Two important breakthroughs

• corbaDictionary
• pass arbitrarily nested run-time dictionaries
  through a constant interface
• DbCorbaClient
• client can call get, getOne, query without
  requiring an oracleClient license

18
First Application SamApiCore

• Intelligent client wrapper around DbCorbaClient
• Each object represents ONE ROW of a dbTable
  (e.g., a getOne operation)
• adds our knowledge of nameOrId initialization

19
SamApiCore

• Direct mapping between Dict/DictModifier and
  object methods
• station SamApiCore.SamApiCoreStation(nameOrId)
• person SamApiCore.SamApiCorePerson(usernameOrId)
  
• ...
• station.stationName()
• station.stationId()
• ...
• person.firstName()

20
Example

• Code
• !/usr/bin/env python
• import SamApiCore
• s SamApiCore.SamApiCoreStation('central-analysi
  s')
• print "dbAttrList s" s.getDbAttributeList()
• print "stationName s" s.stationName()
• print "stationId s" s.stationId()
• print "stationDesc s" s.stationDesc()
• Output
• dbAttrList 'lifeCycleStatusId',
  'stationMonitorLevelId', 'stationId',
  'stationName', 'createDate', 'createUser',
  'updateDate', 'updateUser', 'stationDesc'
• stationName central-analysis
• stationId 1163
• stationDesc D0MINO

21
Next Layer SamApiClient

• Basic sorts of container objects for one SAM
  object
• Consumer has consumerId, contains SamApiCore
  objects for station, project, application, etc.
• DataFile has fileId, methods to get fileLineage,
  consumer who produced the file, etc.
• get methods implemented internally using
  _getAndSetForFutureReference
• results are cached in the object

22
Example Client code

• !/usr/bin/env python
• import SamApiClient
• c SamApiClient.SamApiClientConsumer(40916)
• print("Consumer id s" c.consumerId())
• print("\tuser s" c.getUser())
• print("\tstation s" c.getStation())
• print("\tapplicationName s, applicationVersion
  s, applicationFamily s"
• (c.getApplicationName(), c.getApplicationVer
  sion(), c.getApplicationFamily()))
• print("\twork group name s"
  c.getWorkGroupName())
• print("\tprojDefId s, projDefName s"
  (c.getProjDefId(), c.getProjDefName()))
• p SamApiClient.SamApiClientPerson( c.getUser()
  )
• wgList p.getRegisteredWorkingGroups()
• print("s is registered to use groups s"
  (p.userName(), wgList))
• snapshotFileIdList c.getSnapshotFileIdList()
• deliveredFileIdList c.getDeliveredFileIdList()
• consumedFileIdList c.getConsumedFileIdList()
• print("Snapshot contained s files"
  len(snapshotFileIdList))
• print("Station delivered s files"
  len(deliveredFileIdList))

23
Output

• Consumer id 40916
• user jozwiak
• station chris
• applicationName test-harness,
  applicationVersion 1, applicationFamily
  test-harness
• work group name test
• projDefId 62452, projDefName
  test-harness__06-03-02-08-05-54
• jozwiak is registered to use groups 'mcc99',
  'test', 'demo', 'algo', 'trigsim', 'muon',
  'calalign', 'emid', 'muid', 'tauid', 'test5',
  'test1', 'test2', 'test3', 'test4', 'online',
  'd0production', 'dzero'
• Snapshot contained 104 files
• Station delivered 33 files
• Consumer consumed 33 files

24
Another example projDefTreeWalker.py

• Input project definition name or id
• Output all consumers that ever used this project
  definition, and anything you want to know about
  each consumer
• which files were delivered/consumed
• which application was used
• what user/group/station/etc....
• ...in less than 70 lines of client code...

25
Samples to look at

• projDefTreeWalker
• source http//d0db-dev.fnal.gov/sam_api/projD
  efTreeWalker.py
• output http//d0db-dev.fnal.gov/sam_api/projDefT
  reeWalker.output.txt
• SamApiCore
• source http//d0db-dev.fnal.gov/sam_api/coreTest
  .py
• output http//d0db-dev.fnal.gov/sam_api/coreTest
  .output.txt
• SamApiClient
• source http//d0db-dev.fnal.gov/sam_api/clientTe
  st.py
• output http//d0db-dev.fnal.gov/sam_api/clientTe
  st.output.txt

26
Other potential use cases

• Metadata client?
• passing of arbitrarily nested dictionaries?
• sounds ideal!
• Station monitoring utilities?
• get(what) instead of dump(all)
• output formatted by the client application, not
  by the station
• ???...

27
Current Status

• DbCorbaClient layer complete
• but testing by others may uncover problems in the
  corbaDictionary layer (lists of lists of
  dictionaries, etc.?)
• SamApiCore framework is complete, implementation
  is not.
• I only implemented the tables I understand and
  use.
• SamApiClient needs input from customers about
  how they wish to view the higher-level objects.

28
What else is needed?

• c implementation of corbaDictionary including
  the None value
• ... and then begin using this in the station
  code
• SamApiCore implementation for all DbTable.py
  files
• enhancement to dbgen auto-generate SamApiCore
  classes
• a good shifter project?

29
... what else is needed?

• Should probably be converted to a directory
  structure a la python modules, rather than one
  big imported file
• tool to generate sensible documentation about
  the SamApiCore/SamApiClient classes
• pydoc doesnt quite make it...
• testing by folks other than myself

30
A big question

• Are lots of little queries better than fewer
  incredibly big queries?
• I hope so...
• We may need to turn down the debugging in the log
  files...

31
Further Reading

• Pydoc-generated documentation, SamApi
• http//d0db-dev.fnal.gov/sam_api/SamApiCore.html
• http//d0db-dev.fnal.gov/sam_api/SamApiClient.html
  
• corbaDictionary
• sam_common/src/python/CommonCorbaClasses.py
• DbCorbaClient
• sam_common/src/python/DbCorbaClient.py,
• sam_db_server/src/DbCorbaImpl.py, InDbCorba.py
• SamApi
• sam_api/src/python/SamApiCore.py, SamApiClient.py

32
Open questions

• Should it be called dbServerClient? dbClient?
• Implement dbStationClient separately in c
• Note dbClientImpl and dbCorbaClient both do
  their own unpacking of corbaDictionaries
• Need easier exception passing or samExceptions
  need to start inheriting from Exception
• Some of the container objects create too many
  contained objects without needing to
• shouldnt look up the children methods until a
  child is requested
• Usually as a result of grandchildren being
  created