For every applicable var in vars - removes any existing wiretap and alters the root binding to be a variadic function closing over the value g of the var and the user provided function f.

A var is considered applicable if its metadata does not contain the key :wiretap.wiretap/exclude and its value implements Fn, i.e. is an object created via fn.

When the resulting “wiretapped” function is called, a map representing the context of the call is first passed to f before the result is computed by applying g to to any args provided. f is then called with an updated context before the result is returned. In both cases, f is executed within a try/catch on the same thread. The result of calling f is discarded.

Returns a coll of all modified vars.

The following contextual data is will always be present in the map passed to f:

Key	When	Value
:id	pre/post	Uniquely identifies the call. Same value for pre and post calls.
:name	pre/post	A symbol. Taken from the meta of the var.
:ns	pre/post	A namespace. Taken from the meta of the var.
:function	pre/post	The value that will be applied to the value of :args.
:thread	pre/post	The name of the thread.
:stack	pre/post	The current stacktrace.
:depth	pre/post	Number of wiretapped function calls on the stack.
:args	pre/post	The seq of args that value of :function will be applied to.
:start	pre/post	Nanoseconds since some fixed but arbitrary origin time.
:parent	pre/post	The context of the previous wiretapped function on the stack.
:pre?	pre	true
:post?	post	true
:stop	post	Nanoseconds since some fixed but arbitrary origin time.
:result	post	The result of applying the value of :function to :args.
:error	post	Any exception caught during computation of the result.

If the wiretapped var is a multimethod then the following information will also be present.

Key	When	Value
:multimethod?	pre/post	true
:dispatch-val	pre/post	The dispatch value used to select the method.

Like install! but ensures that f is only called post invocation.

The following contextual data is will always be present in the map passed to f:

Key	Value
:id	Uniquely identifies the call. Same value for pre and post calls.
:name	A symbol. Taken from the meta of the var.
:ns	A namespace. Taken from the meta of the var.
:function	The value that will be applied to the value of :args.
:thread	The name of the thread.
:stack	The current stacktrace.
:depth	Number of wiretapped function calls on the stack.
:args	The seq of args that value of :function will be applied to.
:start	Nanoseconds since some fixed but arbitrary origin time.
:parent	The context of the previous wiretapped function on the stack.
:post?	true
:stop	Nanoseconds since some fixed but arbitrary origin time.
:result	The result of applying the value of :function to :args.
:error	Any exception caught during computation of the result.

If the wiretapped var is a multimethod then the following information will also be present.

Key	Value
:multimethod?	true
:dispatch-val	The dispatch value used to select the method.

Like install! but ensures that f is only called pre invocation.

The following contextual data is will always be present in the map passed to f:

Key	Value
:id	Uniquely identifies the call. Same value for pre and post calls.
:name	A symbol. Taken from the meta of the var.
:ns	A namespace. Taken from the meta of the var.
:function	The value that will be applied to the value of :args.
:thread	The name of the thread.
:stack	The current stacktrace.
:depth	Number of wiretapped function calls on the stack.
:args	The seq of args that value of :function will be applied to.
:start	Nanoseconds since some fixed but arbitrary origin time.
:parent	The context of the previous wiretapped function on the stack.
:pre?	true

If the wiretapped var is a multimethod then the following information will also be present.

Key	Value
:multimethod?	true
:dispatch-val	The dispatch value used to select the method.

Uninstalls all wiretaps from all applicable vars in vars.

A var is considered applicable if the key :wiretap.wiretap/uninstall is present in the metadata and the key :wiretap.wiretap/exclude is not.

Returns a coll of all modified vars.