wohali commented on issue #1554: Additional Mango-based update handler / VDU functionality URL: https://github.com/apache/couchdb/issues/1554#issuecomment-412322522 Got to thinking more about this one in the shower. Here's a sample Mango-like document structure for a combined VDU/update handler that would capture all of the above: ```json { "queries": [ { "name": "sensor_name", "selector": { "type": "sensor", "ip_address": "$doc.ip_address" }, "fields": ["name"], ... } ], "fields": { "whitelist": ["type", "datetime", "ip_address", "station_name", "temperature", "RH%", "rain_gauge", "wind.speed", "wind.direction", "light", "battery.voltage", "battery.current", "line.voltage", "line.current", "solar.voltage", "solar.current", "register_total"], "blacklist": ["battery.wattage", "rain_gauge.*"], "formats": { "type": ["sensor_reading"], "datetime": { "$or": { "$format": "$iso8601", "$format": "$unixepoch", "$regex": "(\\d{2})-(\\d{2})-(\\d{2}) (\\d{2}):(\\d{2}):(\\d{2})" } }, "battery.voltage": "$float", "battery.current": "$float", "register_total": { "$regex": "^\\$\\d{1,9}\\.\\d{2}$" }, "wind.direction": {"$or": ["N", "NE", "E", "SE", "S", "SW", "W", "NW"]} ... } }, "patch": [ { "op": "add", "path": "/", "value": { "name": "$query:sensor_name.name" } }, { "op": "move", "from": "/ip-address", "path": "/ip_address" }, { "op": "add", "path": "/", "value": { "server_datetime": "$server_time.iso8601 } }, ... ] } ``` Comments: * This runs a Mango query up front to get any documents with `"type": "sensor"` that match the IP address of the incoming request. (Assumes that the `$req` object has that value, not sure we pass that thru to VDUs right now...) * There's then a field presence check. In a real situation, you would probably only have one of `fields.whitelist` and `fields.blacklist`. * Field values/formats are then checked, some just for general structure, one by regex, one by list of acceptable values. The output of a Mango query could be used as input to this, too. (An aside: Mango aggregations could be really useful here, for instance to reduce a query to a single list of acceptable values. See #1254.) * Documents that didn't match `"type": "sensor_reading"` or any of the other format checks would fall through to the next whatever-we-call-this-thing. If all failed, the document would be rejected. * Maybe we add a `"$format": "$datetime"` that includes all the common datetime formats? Just some food for discussion.
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