I want to make a reader function for a tag like this: #jet/val "/"

and I've defined this in src/data_readers.clj: {jet/val clojure.core/str #_jet.data-readers/val}

but I'm getting:

$ echo '{:a "foo bar" :b 2}' | lein jet --from edn --to edn --query "(str :a #jet/val "/" :b)"
Exception in thread "main" java.lang.RuntimeException: No reader function for tag jet/val

got it, it's an edn/read-string option

I guess not, but are there also data readers that can read multiple forms, not only the one following it?

Nope, only one. Wrap in a vector to read "multiple"

I was trying to avoid wrapping in a vector 🙂

For cmd line usage it may be handy to do something like:

jet ... --query '
#jet/do :a
#jet/do :b
'

jet ... --query '[
:a
:b
] ;; <- user might forget to close this
'

but that's mostly a gimmick, I will admit

I could wrap the entire query in an implicit vector

well, in the former case you can repeatedly read until you get eof

that is, clojure.edn/read

yeah, or just wrap a vector and then read, a common trick

the vector already means a sequential query, so like implicit do, I might just wrap it

hello, how can i convert this java to clojure, in clojure i use ring, so i don’t have httpservletrequest,

in ring params i print is #object[java.io.ByteArrayInputStream 0x6b7b093d java.io.ByteArrayInputStream@6b7b093d]

(slurp ( (.getInputStream request))) should work

worth checking out included/missing ring middlewares, as they should handle converting params, request body etc into clojure maps

i have no request variable, in clojure ring is there HttpServletRequest?

AFAIR it's in :body or :params keys of the request map

yes, i found it in :body

https://github.com/ring-clojure/ring/wiki/Parameters

this should help

i need to call the service.verify(params) function, its params is a java map

i don’t know here which i can use as the param for verify

@haiyuan.vinurs how is the data sent to your web service? POST? query params?

How do you guys handle contextual logging when using e.g manifold or core-async?

@jarvinenemil just a theory: you could use binding to set contextual values for a specific call, and refer to the bound value in your logs

rough sketch:

(def ^:dynamic *user*)
(def ^:dynamic *task*)

(defn foo [uname]
 (binding [*user* uname
          *task* "foo"]
     (bar uname))

ah ok, I've never really done "contextual logging" in Clojure before so it would be interesting to know how people do it when it comes to async-stuff. In Java I've always just set the MDC (thread local). Let's say you have a system with bank transactions and you want to have a trace-id for the transaction in the whole system.

async stuff respects dynamic bindings

(if you mean core.async, futures, manifold, or something else sanely designed for clojure usage that is)

also, dynamic bindings have the right semantics for contextual logging - they work as a stack, so when you escape the binding clause the values go back to their up-stack value