@grzegorzrynkowski_clo At first I was going to suggest getting rid of the as-> threader, but after looking at it, I think the following is most straightforward:

(let [b (ServerBuilder/forPort port)]
  (doseq [h handlers]
    (.addService b h))
  (.start (.build b)))

In general, I prefer using side-effecty constructs for side-effecty operations.

For example, doseq for adding services to a mutable object.

If you wanna keep the startup msg, I would do:

(let [b (ServerBuilder/forPort port)
      srvr (do (doseq [h handlers]
                 (.addService b h))
               (.start (.build b)))]
  (println "gRPC server started listening on port" port)
  srvr)

One thing I've found useful to build into functions like these is a promise that is delivered once the service has started. It can either be passed in by the caller, or returned as part of a map that wraps the server object. This makes it possible for tests to use it to ensure the service is ready for requests before the test starts hitting it.

Anyone has an experience with Multi-part uploads with Amazonica ? Context: I am trying the merge 30K+ files into a single file in a Lambda function.

Why does transit-cljs allow you to read/write directly from/to strings, but transit-clj require the construction of ByteArrayInputStream/`ByteArrayOutputStream`? Is there a way to read and write strings directly in the Clojure version?

@dts.siedel because String is the right abstraction in a js runtime, but not in the java runtime. It's simple to call the String constructor on a byte-array, but you end up doing a bunch of pointless work in common use cases if you convert to string (because often your target isn't a String in memory, it's an output destination like a File or socket which provides and OutputStream to write to directly). Similarly for input, the thing that you get the transit data from will almost always offer an input-stream, getting a String first then translating reduces flexibility and adds pointless layers of work.

How to automatically construct spec from data structure?

Is there a Markdown parser in Clojure (or Java) than can parse Markdown with GH extensions?

I'm pondering what best to do with a vanilla java.util.concurrent.Future I'm getting from the Firebase API. trying to .get() it seems to be blocking my REPL thread forever? not sure.

is there a way to wrap it into a Clojure future that will play nicer?

the functions that work on a clojure future also work on that object

realized?, deref (with optional time-out arg), future-cancel

oh, I didn't think I could deref it.

deref will block the same way .get will, except you can optionally provide that time-out arg

I was wrong about realized?, but deref will work

egret.run=> (doto (java.util.concurrent.FutureTask. #(+ 1 1)) (.run))
#object[java.util.concurrent.FutureTask 0x2fa829be "java.util.concurrent.FutureTask@2fa829be"]
egret.run=> (def f *1) 
#'egret.run/f
egret.run=> (realized? f)
ClassCastException java.util.concurrent.FutureTask cannot be cast to clojure.lang.IPending  clojure.core/realized? (core.clj:7453)

egret.run=> @f
2

Hi, I am trying to use DynamoDB (dockerized local) with com.cognitect.aws/api. I am struggling to override the endpoint to match the local one. I am doing this:

(def db (aws/client {:api :dynamodb :endpoint-override "local" }))
(aws/invoke db {:op :ListTables})

=> #:cognitect.anomalies{:category :cognitect.anomalies/not-found, :message "local"}
(meta *1)
=>
{:http-request {:request-method :post,
                :scheme :https,
                :server-port 443,
                :uri "/",
                :headers {"x-amz-date" "20190225T205047Z",
                          "x-amz-target" "DynamoDB_20120810.ListTables",
                          "content-type" "application/x-amz-json-1.0",
                          "host" "local",
                          "authorization" "AWS4-HMAC-SHA256 Credential=AKIAIEJE6SPXIMLB7VRA/20190225/us-east-1/dynamodb/aws4_request, SignedHeaders=content-type;host;x-amz-date;x-amz-target, Signature=2099f67eb5a11b49446bf3cbcf89202d94f3d0cf9973d1d6f5c37e85db202e63"},
                :body "{}",
                :server-name "local"},
 :http-response {:cognitect.anomalies/category :cognitect.anomalies/not-found,
                 :cognitect.anomalies/message "local",
                 :body nil}}

I believe this is a known issue

https://github.com/cognitect-labs/aws-api/issues/59