Adding MCM parser script

README.md

@@ -83,9 +83,17 @@ pip install -U pip setuptools
 pip install .[dev]
 ```
 
+Setup the environment:
+```shell
+export ORDER_CLEAR_CACHE=True
+export ORDER_DATA_LOCATION='/path/to/order-data'
+export X509_USER_PROXY=your-cert-file
+```
+
 ## Testing
 
-After making changes, make sure to run test cases and linting checks.
+TBD. After making changes, make sure to run test cases and linting checks.
+Note. At this time these test are failing. Will fix them later.
 
 ```shell
 ./tests/test.sh
@@ -101,12 +109,6 @@ After making changes, make sure to run test cases and linting checks.
 - Original source hosted at [GitHub](https://github.com/cms-cat/order)
 - Report issues, questions, feature requests on [GitHub Issues](https://github.com/cms-cat/order/issues)
 
-Setup the environment:
-```shell
-export ORDER_CLEAR_CACHE=True                                          
-export ORDER_DATA_LOCATION='/path/to/order-data'
-export X509_USER_PROXY=your-cert-file
-```
 
 <!-- marker-after-development -->
 

mcm.md

@@ -0,0 +1,56 @@
+## Towards an MCM adapter
+
+We may need to parse MCM for some information in the future.  Scripts
+are avialable to do this job at
+[github.com/cms-PdmV/mcm_scripts](https://github.com/cms-PdmV/mcm_scripts/tree/master).
+I copied the minimal code to do the job: the `order/mcm_rest.py` and
+`tests/mcm_get_requests.py`.  The first one is enabling the MCM
+connection. The second one is to execute. Just two examples are
+provided there:
+
+1. Get a list of all `NanoAOD` campaigns: 
+
+```python campaigns =
+mcm.get('campaigns', query='prepid=*NanoAOD*') 
+``` 
+
+This is equivalent to accessing the web page:
+[https://cms-pdmv-prod.web.cern.ch/mcm/campaigns?prepid=*NanoAOD*](https://cms-pdmv-prod.web.cern.ch/mcm/campaigns?prepid=*NanoAOD*).
+In fact, the script would emulate the web access and it **will require
+authentification with CERN SSO via Web Browser**. This is
+inconvenient... Maybe there is a better way, but I do not know of it.
+
+2. Get a list of requests in a given campaign, where dataset starts with `TT`:
+
+```
+campaign_requests = mcm.get('requests', query='member_of_campaign=Run3Summer22NanoAODv12&status=done&dataset_name=TT*')
+```
+
+This is equivalent to accessing this page:
+[https://cms-pdmv-prod.web.cern.ch/mcm/requests?dataset_name=TT*&member_of_campaign=Run3Summer22NanoAODv12](https://cms-pdmv-prod.web.cern.ch/mcm/requests?dataset_name=TT*&member_of_campaign=Run3Summer22NanoAODv12)
+
+Test the script:
+```shell
+python tests/mcm_get_requests.py
+```
+
+
+## Link between MCM and DAS
+
+One can query DAS and find the **full** dataset name, knowing the `prepid` in MCM, like so:
+```shell
+dasgoclient -query="dataset prepid=GEN-Run3Summer22NanoAODv12-00010"
+
+"""
+/TTtoLNu2Q_TuneCP5_13p6TeV_powheg-pythia8/Run3Summer22NanoAODv12-130X_mcRun3_2022_realistic_v5_ext1-v2/NANOAODSIM
+"""
+```
+
+One could also get the MCM prepid of a dataset from DAS, like so:
+```shell
+dasgoclient -query="mcm dataset=/TTtoLNu2Q_TuneCP5_13p6TeV_powheg-pythia8/Run3Summer22NanoAODv12-130X_mcRun3_2022_realistic_v5_ext1-v2/NANOAODSIM"
+
+"""
+GEN-Run3Summer22NanoAODv12-00010*
+"""
+```