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Fix #66: opt-in metadata (#67)

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Jude Payne 2023-05-12 15:09:40 +01:00 committed by GitHub
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1
CHANGELOG.md
View file

@ -5,6 +5,7 @@
- [#63](https://github.com/babashka/pods/issues/63): create directory before un-tarring
- [#59](https://github.com/babashka/pods/issues/59): delete port file on exit
- [#65](https://github.com/babashka/pods/issues/65): fix warnings when defining var with core name in JVM
- [#66](https://github.com/babashka/pods/issues/66): Allow metadata on fn arguments for transit+json
## v0.2.0

33
README.md
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@ -376,11 +376,15 @@ nil
#### Metadata
**From pod to pod client**
*Fixed Metadata on vars*
Pods may attach metadata to functions and macros by sending data to the pod client
in a `"meta"` field as part of a `"var"` section. The metadata must be an appropriate
map, encoded as an EDN string. This is only applicable to vars in the pod and will be
ignored if the var refers to Client-side code, since metadata can already be defined
in those code blocks.
in those code blocks (see 'Dynamic Metadata' below to enable the encoding of metadata).
For example, a pod can define a function called `add`:
@ -392,6 +396,33 @@ For example, a pod can define a function called `add`:
"meta" "{:doc \"arithmetic addition of 2 arguments\" :arglists ([a b])}"}]}]}
```
*Dynamic Metadata*
Pods may send metadata on values returned to the client if metadata encoding is enabled
for the particular transport format used by the pod.
For example, if your pod uses `:transit+json` as its format, you can enable metadata
encoding by adding `:transform transit/write-meta` (or whatever transit is aliased to)
to the optional map passed to `transit/writer`. e.g.:
````clojure
(transit/writer baos :json {:transform transit/write-meta})
````
##### From pod client to pod
Currently sending metadata on arguments passed to a pod function is available only for the
`transit+json` format and can be enabled on a per var basis.
A pod can enable metadata to be read on arguments by sending the "arg-meta" field to "true"
for the var representing that function. For example:
````clojure
{:format :transit+json
:namespaces [{:name "pod.babashka.demo"
:vars [{"name" "round-trip" "arg-meta" "true"}]}]}
````
#### Deferred namespace loading
When your pod exposes multiple namespaces that can be used independently from

22
src/babashka/pods/impl.clj
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@ -28,6 +28,9 @@
(defn bytes->string [^"[B" bytes]
(String. bytes))
(defn bytes->boolean [^"[B" bytes]
(= "true" (String. bytes)))
(defn get-string [m k]
(-> (get m k)
bytes->string))
@ -36,6 +39,10 @@
(some-> (get m k)
bytes->string))
(defn get-maybe-boolean [m k]
(some-> (get m k)
bytes->boolean))
(defn next-id []
(str (java.util.UUID/randomUUID)))
@ -83,10 +90,12 @@
(let [wh (transit/write-handler tag-fn val-fn)]
(swap! transit-default-write-handlers assoc *pod-id* wh)))
(defn transit-json-write [pod-id ^String s]
(defn transit-json-write
[pod-id ^String s metadata?]
(with-open [baos (java.io.ByteArrayOutputStream. 4096)]
(let [w (transit/writer baos :json {:handlers (get @transit-write-handler-maps pod-id)
:default-handler (get @transit-default-write-handlers pod-id)})]
(let [w (transit/writer baos :json (merge {:handlers (get @transit-write-handler-maps pod-id)
:default-handler (get @transit-default-write-handlers pod-id)}
(when metadata? {:transform transit/write-meta})))]
(transit/write w s)
(str baos))))
@ -98,7 +107,7 @@
write-fn (case format
:edn pr-str
:json cheshire/generate-string
:transit+json #(transit-json-write (:pod-id pod) %))
:transit+json #(transit-json-write (:pod-id pod) % (:arg-meta opts)))
id (next-id)
chan (if handlers handlers
(promise))
@ -128,11 +137,12 @@
edn/read-string)
name-sym (if vmeta
(with-meta name-sym vmeta)
name-sym)]
name-sym)
metadata? (get-maybe-boolean var "arg-meta")]
[name-sym
(or code
(fn [& args]
(let [res (invoke pod sym args {:async async?})]
(let [res (invoke pod sym args {:async async? :arg-meta metadata?})]
res)))]))
vars))

26
test-pod/pod/test_pod.clj
View file

@ -61,6 +61,12 @@
(transit/write w s)
(str baos))))
(defn transit-json-write-meta [s]
(with-open [baos (java.io.ByteArrayOutputStream. 4096)]
(let [w (transit/writer baos :json {:transform transit/write-meta})]
(transit/write w s)
(str baos))))
(defn run-pod [cli-args]
(let [format (cond (contains? cli-args "--json") :json
(contains? cli-args "--transit+json") :transit+json
@ -130,6 +136,10 @@
{"name" "read-other-tag"
"code" "(defn read-other-tag [x] [x x])"
"meta" "{:doc \"unread\"}"}
{"name" "round-trip-meta"
"arg-meta" "true"}
{"name" "dont-round-trip-meta"
"arg-meta" "false"}
{"name" "-local-date-time"}
{"name" "transit-stuff"
"code" "
@ -235,6 +245,22 @@
{"status" ["done"]
"id" id
"value" "#my/other-tag[1]"})
pod.test-pod/round-trip-meta
(write out
{"status" ["done"]
"id" id
"value"
(case format
:transit+json (transit-json-write-meta (first args))
(write-fn (first args)))})
pod.test-pod/dont-round-trip-meta
(write out
{"status" ["done"]
"id" id
"value"
(case format
:transit+json (transit-json-write-meta (first args))
(write-fn (first args)))})
pod.test-pod/-local-date-time
(write out
{"status" ["done"]

18
test-resources/test_program.clj
View file

@ -84,6 +84,21 @@
(.isArray (class v)))
true))
(def round-trip-meta
(if (= "transit+json" fmt)
(= {:my-meta 2} (meta (pod.test-pod/round-trip-meta (with-meta [2] {:my-meta 2}))))
true))
(def round-trip-meta-nested
(if (= "transit+json" fmt)
(= {:my-meta 3} (meta (first (pod.test-pod/round-trip-meta [(with-meta [3] {:my-meta 3})]))))
true))
(def dont-round-trip-meta
(if (= "transit+json" fmt)
(= nil (meta (pod.test-pod/dont-round-trip-meta (with-meta [2] {:my-meta 2}))))
true))
(require '[pod.test-pod.only-code :as only-code])
(def should-be-1 (only-code/foo))
@ -116,6 +131,9 @@
fn-called
local-date-time
assoc-string-array
round-trip-meta
round-trip-meta-nested
dont-round-trip-meta
should-be-1
add-sync-meta
error-meta

3
test/babashka/pods/test_common.clj
View file

@ -34,6 +34,9 @@
3
true ;; local-date
true ;; roundtrip string array
true ;; roundtrip metadata
true ;; roundtrip metadata nested
true ;; dont roundtrip metadata (when arg-meta "false"/ absent)
1
"add the arguments"
nil