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public:lta_tricks [2019-09-20 07:25]
Thomas Jürges Updated link to LOFAR stager API Python module to point to the ASTRON gitlab repo
public:lta_tricks [2020-07-21 13:53] (current)
Thomas Jürges Updated link for Python stager API releases
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 There is a server that gives the option to run your own queries on the database [[https://​lta-dbview.lofar.eu/​|https://​lta-dbview.lofar.eu/​]] There is a server that gives the option to run your own queries on the database [[https://​lta-dbview.lofar.eu/​|https://​lta-dbview.lofar.eu/​]]
  
-A useful query might be this one, that gives you all files for a certain Obs Id (SAS VIC tree ID).<​code>​+A useful query might be this one, that gives you all files for a certain Obs Id (SAS VIC tree ID). 
 +<​code>​ 
 SELECT fo.URI, dp."​dataProductType",​ dp."​dataProductIdentifier",​ SELECT fo.URI, dp."​dataProductType",​ dp."​dataProductIdentifier",​
  ​dp."​processIdentifier"​  ​dp."​processIdentifier"​
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   AND fo.data_object = dp."​object_id"​   AND fo.data_object = dp."​object_id"​
   AND dp."​isValid">​ 0   AND dp."​isValid">​ 0
 +
 </​code>​ </​code>​
  
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   AND fo.data_object = dp."​object_id"​   AND fo.data_object = dp."​object_id"​
   AND dp."​isValid">​ 0   AND dp."​isValid">​ 0
 +
 </​code>​ </​code>​
  
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 Once you have installed the client, set up your user name and password. These are the same as for MoM. Remember that this is just a different interface to the LTA catalogue: you will need the same credentials as for the web interface. Once you have installed the client, set up your user name and password. These are the same as for MoM. Remember that this is just a different interface to the LTA catalogue: you will need the same credentials as for the web interface.
  
-After installing the LTA client, the file .awe/​Environment.cfg will appear in your home directory (if not, then create one). Make sure the file at least contains the following lines:<​file>​+After installing the LTA client, the file .awe/​Environment.cfg will appear in your home directory (if not, then create one). Make sure the file at least contains the following lines: 
 +<​file>​ 
 [global] [global]
 database_user ​      : <your username>​ database_user ​      : <your username>​
 database_password ​  : <your password>​ database_password ​  : <your password>​
 +
 </​file>​ </​file>​
  
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 pprint(result) pprint(result)
 +
 </​code>​ </​code>​
  
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 Pointing found RA 95.561458 DEC 24.584056 Pointing found RA 95.561458 DEC 24.584056
 ..etc.. ..etc..
 +
 </​code>​ </​code>​
  
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 In case of errors, there may be the need to open some port on the firewall at your institution. Specifically,​ port 1521 should be open. Also make sure that the LTA client library can be found in your PYTHONPATH (see [[:​lta:​client_installation|LTA Client installation]] for more details). In case of trouble, get in contact with Science Operations and Support. In case of errors, there may be the need to open some port on the firewall at your institution. Specifically,​ port 1521 should be open. Also make sure that the LTA client library can be found in your PYTHONPATH (see [[:​lta:​client_installation|LTA Client installation]] for more details). In case of trouble, get in contact with Science Operations and Support.
  
-== Examples ==+==== Examples ​====
  
 Once you have tested that your connection to the catalogue is working, you are ready to browse the archive and stage the data you need. Here we will list a few examples of python scripts that can be used to access the LTA. All of them will need to import some modules: Once you have tested that your connection to the catalogue is working, you are ready to browse the archive and stage the data you need. Here we will list a few examples of python scripts that can be used to access the LTA. All of them will need to import some modules:
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     Observation     Observation
 from awlofar.toolbox.LtaStager import LtaStager, LtaStagerError from awlofar.toolbox.LtaStager import LtaStager, LtaStagerError
 +
 </​code>​ </​code>​
  
 The lines above must be added to each of the scripts below for these to work. The lines above must be added to each of the scripts below for these to work.
  
-This simple ​script will allow you to find all data within a single project, for example LC2_035. Please change the project name to the code of a project of yours. If you also want to stage the data you found, just set the do_stage variable to True. Be careful with how many files you stage and what size they have: the same limits as for the web interface apply here.+=== Ex: get staging URI's === 
 + 
 +This script will allow you to find all data within a single project, for example LC2_035. Please change the project name to the code of a project of yours. If you also want to stage the data you found, just set the do_stage variable to True. Be careful with how many files you stage and what size they have: the same limits as for the web interface apply here.
  
 <code python> <code python>
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     stager = LtaStager()     stager = LtaStager()
     stager.stage_uris(uris)     stager.stage_uris(uris)
 +
  
 </​code>​ </​code>​
 +
 +=== Ex: filter on subbands ===
  
 The following script will find subbands 301 and 302 for all targets within two different projects. The following script will find subbands 301 and 302 for all targets within two different projects.
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     for project in (project1, project2) :     for project in (project1, project2) :
         stager.stage_uris(uris[project])         stager.stage_uris(uris[project])
 +
 </​code>​ </​code>​
 +
 +=== Ex: filter on frequency and observation date ===
  
 Here, we find data between freq1 and freq2 taken within one project between day1 and day2 Here, we find data between freq1 and freq2 taken within one project between day1 and day2
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     stager = LtaStager()     stager = LtaStager()
     stager.stage_uris(uris)     stager.stage_uris(uris)
 +
  
 </​code>​ </​code>​
  
-== Example; ​query public data ==+=== Ex: query public data ===
  
 Querying public data in projects you are not member of. First set project ALL, then construct a query and optionally limit the query to a certain project : Querying public data in projects you are not member of. First set project ALL, then construct a query and optionally limit the query to a certain project :
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 print(len(query)) print(len(query))
 # 1800 # 1800
 +
 +</​code>​
 +
 +=== Ex: get release dates ===
 +
 +<code python>
 +from awlofar.main.aweimports import Observation,​ PipelineRun,​ DataProduct
 +from common.database.Context import context
 +
 +project = '​LC2_035'​
 +
 +# Query for private data of the project, you must be member of the project
 +private_data = True
 +
 +# To see private data of this project, you must be member of this project
 +if private_data :
 +    context.set_project(project)
 +    if project != context.get_current_project().name:​
 +        raise Exception("​You are not member of project %s" % project)
 +
 +# Observations
 +query_observations = Observation.select_all().project_only(project)
 +for observation in query_observations :
 +    print("​Querying ObservationID %s, %s" % (observation.observationId,​ observation.releaseDate))
 +
 +# Pipelines
 +query_pipelines = PipelineRun.select_all().project_only(project)
 +for pipeline in query_pipelines :
 +    print("​Pipeline:​ %s, %s, %s" % (type(pipeline).__name__,​ pipeline.pipelineName,​ pipeline.releaseDate))
 +
 +# Data products
 +query_products = DataProduct.select_all().project_only(project)
 +query_products &= DataProduct.isValid == 1
 +for product in query_products :
 +    print("​Product:​ %s, %s, %s, %s" % (product.dataProductIdentifier,​ product.dataProductIdentifierSource,​ product.dataProductType,​ product.releaseDate))
 +
 </​code>​ </​code>​
  
 ===== Python Module for Staging ===== ===== Python Module for Staging =====
  
-The python interaction with the LTA catalog can be complemented with the use of a specific module developed to give users more control over their staging requests. ​ The module is made available **[[https://​git.astron.nl/​ro/​lofar_stager_api/​-/​tags|here]]** and its functions are mostly self-explanatory.+The python interaction with the LTA catalog can be complemented with the use of a specific module developed to give users more control over their staging requests. The module is made available **[[https://​git.astron.nl/​ro/​lofar_stager_api/​-/​releases|here]]** and its functions are mostly self-explanatory. 
 + 
 +**Alternatively to the .awe/​Environment.cfg described above, user credentials can also be provided via a file ~/​.stagingrc with credentials of your Lofar account**, similar to ./wgetrc: 
 +<​code>​
  
-**Alternatively to the .awe/​Environment.cfg described above, user credentials can also be provided via a file ~/​.stagingrc with credentials of your Lofar account**, similar to ./​wgetrc:<​code>​ 
   user=XXX   user=XXX
   password=YYY   password=YYY
 +
 </​code>​ </​code>​
  
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   - Status ​     ->     on hold   - Status ​     ->     on hold
   - User id      ->     1919   - User id      ->     1919
 +
 </​code>​ </​code>​
  
  
  • Last modified: 2019-09-20 07:25
  • by Thomas Jürges