jaydoane commented on a change in pull request #2: Avoid using `erlang:now/0`
URL: https://github.com/apache/couchdb-smoosh/pull/2#discussion_r259474872
##########
File path: src/smoosh_server.erl
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@@ -265,8 +265,10 @@ find_channel(Tab, [Channel|Rest], Object) ->
Pid = channel_pid(Tab, Channel),
LastUpdated = smoosh_channel:last_updated(Pid, Object),
Staleness = 6.0e7 * list_to_integer(config:get("smoosh", "staleness",
"5")),
+ Now = erlang:monotonic_time(),
case LastUpdated =:= false orelse
- timer:now_diff(now(), LastUpdated) > Staleness of
+ erlang:convert_time_unit(
+ Now - LastUpdated, native, microsecond) > Staleness of
Review comment:
How do we know at a glance that`Staleness` has units of `microsecond`? Maybe
while we're updating this code, we could eliminate some magic. The README says:
"**staleness** The number of minutes that the (expensive) priority calculation
can be stale for before it is recalculated. Defaults to 5." So I'd recommend
we do something like:
```
-define(MICROSECONDS_PER_MINUTE, 60 * 1.0e6).
```
And then write line 267 as
```
Staleness = MICROSECONDS_PER_MINUTE * config:get_integer(
"smoosh", "staleness", "5"),
```
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