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ac5feb4723
This change will only affect rare advanced users that depend on the return value of `log!` or `event!`. For all other users this will be a non-breaking change. Before this commit: `log!` and `event!` returned true iff signal was allowed. After this commit: `log!` and `event!` now ALWAYS return nil. `log!?` and `event!?` have been added that keep the old behaviour. Motivation: It's pretty rare to use the return value when generating log or event signals. I originally included the return value since it CAN be handy, and I figured it could just be ignored by those that don't need it. But #53 showed that there's a downside I hadn't anticipated - some users may actually depend on / prefer a nil return to prevent accidentally affecting program flow. I think that's a legitimate enough concern to still make a change now before v1 final. Apologies for the nuissance!
32 lines
1.2 KiB
Text
32 lines
1.2 KiB
Text
"Error" signal creator, emphasizing (optional id) + error (Exception, etc.).
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Default kind: `:error`
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Default level: `:error`
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Returns:
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ALWAYS (unconditionally) returns the given error, so can conveniently be
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wrapped by `throw`: (throw (error! (ex-info ...)), etc.
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Examples:
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(throw (error! (ex-info "MyEx" {}))) ; %> {:kind :error, :level :error, :error <MyEx> ...}
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(throw (error! ::my-id (ex-info "MyEx" {}))) ; %> {... :id ::my-id ...}
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(throw
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(error!
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{:let [x "x"] ; Available to `:data` and `:msg`
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:data {:x x}
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:msg ["My message:" x]}
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(ex-info "MyEx" {}))) ; %> {... :data {x "x"}, :msg_ "My msg: x" ...}
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Tips:
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- Test using `with-signal`: (with-signal (error! ...)).
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- Supports the same options [2] as other signals [1].
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- `error` arg is a platform error (`java.lang.Throwable` or `js/Error`).
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----------------------------------------------------------------------
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[1] See `help:signal-creators` - (`signal!`, `log!`, `event!`, ...)
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[2] See `help:signal-options` - {:keys [kind level id data ...]}
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[3] See `help:signal-content` - {:keys [kind level id data ...]}
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[4] See `help:signal-filters` - (by ns/kind/id/level, sampling, etc.)
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