[server] Make connection pooler configurable and set better default values Drop the configuration connections-pool-size and add new configurations options: * connections-pool-min-size. Set to 0 by default so we open connections only when needed. This avoid opening min-size*processes connections at startup, which is, it think, a good default. * connections-pool-max-size. Set to 0 (unlimited) by default, so we move the bottleneck to postgresql. * connections-idle-timeout. Set to 10 minutes. I don't have arguments about this except that this is the default in pgbouncer.

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from cubicweb.server.sources import datafeed

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class SourceParserSuccess(datafeed.DataFeedParser):

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    __regid__ = 'test_source_parser_success'

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    def process(self, url, raise_on_error=False):

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        entity = self._cw.create_entity('Card', title=u'success')

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        self.notify_updated(entity)

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class SourceParserFail(SourceParserSuccess):

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    __regid__ = 'test_source_parser_fail'

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    def process(self, url, raise_on_error=False):

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        entity = self._cw.create_entity('Card', title=u'fail')

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        self.notify_updated(entity)

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        raise RuntimeError("fail")