Mercurial > p > roundup > code
view roundup/test/tx_Source_detector.py @ 6565:2c2dbfc332ba
Try to handle multiple connections better.
The session database is a hot spot. When multiple requests (e.g. 20)
come in at the same time session database contention can get great.
The original code didn't retry session database access when the open
failed. This resulted in errors at the client.
The second pass delayed 0.01 seconds and retried. It was better but we
still had multiple second stalls. I think the first request got in,
everybody else backed up and then retried at the same time. Again they
stepped on each other. With logging I would see many counters go all
the way to low single digits or to -1 indicating falure.
This pass uses randomint to generate delays from 0-.125 seconds in 5ms
increments. This performs better in testing. I rarely saw a counter
less than 13 (2 failed retries). Current logging starts after 6
failures and counts down until success or failure.
| author | John Rouillard <rouilj@ieee.org> |
|---|---|
| date | Thu, 16 Dec 2021 20:02:00 -0500 |
| parents | 58817c3bf471 |
| children | 137aabd876ad |
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# # Example output when the web interface changes item 3 and the email # (non pgp) interface changes item 4: # # tx_SourceCheckAudit(3) pre db.tx_Source: cgi # tx_SourceCheckAudit(4) pre db.tx_Source: email # tx_SourceCheckAudit(3) post db.tx_Source: cgi # tx_SourceCheckAudit(4) post db.tx_Source: email # tx_SourceCheckReact(4) pre db.tx_Source: email # tx_SourceCheckReact(4) post db.tx_Source: email # tx_SourceCheckReact(3) pre db.tx_Source: cgi # tx_SourceCheckReact(3) post db.tx_Source: cgi # # Note that the calls are interleaved, but the proper # tx_Source is associated with the same ticket. from __future__ import print_function import time as time def tx_SourceCheckAudit(db, cl, nodeid, newvalues): ''' An auditor to print the value of the source of the transaction that trigger this change. The sleep call is used to delay the transaction so that multiple changes will overlap. The expected output from this detector are 2 lines with the same value for tx_Source. Tx source is: None - Reported when using a script or it is an error if the change arrives by another method. "cli" - reported when using roundup-admin "web" - reported when using html based web pages "rest" - reported when using the /rest web API "xmlrpc" - reported when using the /xmlrpc web API "email" - reported when using an unautheticated email based technique "email-sig-openpgp" - reported when email with a valid pgp signature is used ''' if __debug__ and False: print("\n tx_SourceCheckAudit(%s) db.tx_Source: %s"%(nodeid, db.tx_Source)) newvalues['tx_Source'] = db.tx_Source # example use for real to prevent a change from happening if it's # submited via email # # if db.tx_Source == "email": # raise Reject, 'Change not allowed via email' def tx_SourceCheckReact(db, cl, nodeid, oldvalues): ''' An reactor to print the value of the source of the transaction that trigger this change. The sleep call is used to delay the transaction so that multiple changes will overlap. The expected output from this detector are 2 lines with the same value for tx_Source. Tx source is: None - Reported when using a script or it is an error if the change arrives by another method. "cli" - reported when using roundup-admin "web" - reported when using html based web pages "rest" - reported when using the /rest web API "xmlrpc" - reported when using the /xmlrpc web API "email" - reported when using an unautheticated email based technique "email-sig-openpgp" - reported when email with a valid pgp signature is used ''' if __debug__ and False: print(" tx_SourceCheckReact(%s) db.tx_Source: %s"%(nodeid, db.tx_Source)) def init(db): db.issue.audit('create', tx_SourceCheckAudit) db.issue.audit('set', tx_SourceCheckAudit) db.issue.react('set', tx_SourceCheckReact) db.issue.react('create', tx_SourceCheckReact) db.msg.audit('create', tx_SourceCheckAudit)