Move SSD event JSON to typed Kotlin

ober

6fda69f0efb773b6f7a3ee0080d4e97fcb9b106e

diff --git a/.build.yml b/.build.yml
index 8ebb922..73f18b8 100644
--- a/.build.yml
+++ b/.build.yml
@@ -5,7 +5,7 @@ packages:
   - make=4.4.1-r4
 sources:
   # Build dependency: full immutable commit, mirrored in dependencies.lock.json.
-  - "https://git.sr.ht/~lisp/jerboa#1668be75bfbde97ecbf729e038c656cba6d3ffab"
+  - "https://git.sr.ht/~lisp/jerboa#4e842a4908d69ef7b0e797548bcb6d2600c3962c"
   # The second source is the build subject selected by the SourceHut submitter.
   - https://git.sr.ht/~lisp/jerboa-android
 tasks:
@@ -14,6 +14,6 @@ tasks:
       test "$(apk info -v chez-scheme)" = chez-scheme-10.3.0-r2
       test "$(apk info -v git)" = git-2.54.0-r0
       test "$(apk info -v make)" = make-4.4.1-r4
-      test "$(git -C ../jerboa rev-parse HEAD)" = 1668be75bfbde97ecbf729e038c656cba6d3ffab
-      test "$(git -C ../jerboa rev-parse 'HEAD^{tree}')" = 75d8ab23e37c03002c2ca593ef3920f8857a9ca8
+      test "$(git -C ../jerboa rev-parse HEAD)" = 4e842a4908d69ef7b0e797548bcb6d2600c3962c
+      test "$(git -C ../jerboa rev-parse 'HEAD^{tree}')" = ba29fe6f6815eb1ebddb124d1f3b1b8101aa6769
       JERBOA="chez --libdirs .:../jerboa/lib --script" make test
diff --git a/dependencies.lock.json b/dependencies.lock.json
index 168756a..e1840e6 100644
--- a/dependencies.lock.json
+++ b/dependencies.lock.json
@@ -11,8 +11,8 @@
   "generator_runtime": {
     "name": "jerboa",
     "repository": "https://git.sr.ht/~lisp/jerboa",
-    "commit": "1668be75bfbde97ecbf729e038c656cba6d3ffab",
-    "tree": "75d8ab23e37c03002c2ca593ef3920f8857a9ca8"
+    "commit": "4e842a4908d69ef7b0e797548bcb6d2600c3962c",
+    "tree": "ba29fe6f6815eb1ebddb124d1f3b1b8101aa6769"
   },
   "assurance_tools": {
     "osv_scanner": {
diff --git a/scripts/verify-supply-chain.sh b/scripts/verify-supply-chain.sh
index 040b4ad..e134ef8 100755
--- a/scripts/verify-supply-chain.sh
+++ b/scripts/verify-supply-chain.sh
@@ -3,8 +3,8 @@ set -eu
 
 repo=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd -P)
 lock="$repo/dependencies.lock.json"
-jerboa_commit=1668be75bfbde97ecbf729e038c656cba6d3ffab # gitsafe:ignore
-jerboa_tree=75d8ab23e37c03002c2ca593ef3920f8857a9ca8 # gitsafe:ignore
+jerboa_commit=4e842a4908d69ef7b0e797548bcb6d2600c3962c # gitsafe:ignore
+jerboa_tree=ba29fe6f6815eb1ebddb124d1f3b1b8101aa6769 # gitsafe:ignore
 gradle_sha=20f1b1176237254a6fc204d8434196fa11a4cfb387567519c61556e8710aed78
 jdk_macos_sha=8fa1eff40bb637a33613b2ccb8b12c70dc3661cc22cf8e784943715769a05336
 jdk_linux_sha=d8afc263758141a66e0e3aafc321e783f7016696f4eaea067d340a269037d331
diff --git a/templates/ssd-review.ss b/templates/ssd-review.ss
index 4f1dab5..93f94c3 100644
--- a/templates/ssd-review.ss
+++ b/templates/ssd-review.ss
@@ -3444,6 +3444,48 @@
               (json-object-put-string! out "native_error" nativeError)
               out)))))
 
+    (typed-kotlin-file "com/sfb/ssdreview/EventJson.kt"
+      (kotlin-imports (org json JSONObject))
+      (typed-library (com sfb ssdreview)
+        (export groundTruthPathDetails snapshotEventJson sessionEventJson)
+        (type JSONObject)
+        (type Int32)
+        (type String)
+        (def (groundTruthPathDetails (path : String)) : JSONObject
+          (let ((out (json-object-empty)))
+            (begin
+              (json-object-put-string! out "ground_truth_path" path)
+              out)))
+        (def (baseEventJson (eventType : String)
+                            (sessionId : String)
+                            (sourceKey : String)
+                            (details : JSONObject)) : JSONObject
+          (let ((out (json-object-empty)))
+            (begin
+              (json-object-put-int32! out "schema_version" (int32 1))
+              (json-object-put-int! out "created_at" (system-current-time-millis))
+              (json-object-put-string! out "type" eventType)
+              (json-object-put-string! out "session_id" sessionId)
+              (json-object-put-string! out "source_key" sourceKey)
+              (json-object-put-json-object! out "details" details)
+              out)))
+        (def (snapshotEventJson (sessionId : String)
+                                (sourceKey : String)
+                                (truthFileName : String)) : JSONObject
+          (baseEventJson
+            "save_snapshot"
+            sessionId
+            sourceKey
+            (groundTruthPathDetails truthFileName)))
+        (def (sessionEventJson (eventType : String)
+                               (session : SsdSession)
+                               (details : JSONObject)) : JSONObject
+          (baseEventJson
+            eventType
+            (SsdSession-sessionId session)
+            (SsdSession-sourceKey session)
+            details))))
+
     (typed-kotlin-file "com/sfb/ssdreview/TruthIndexSelect.kt"
       (typed-library (com sfb ssdreview)
         (export bestTruthIndexForSession)
@@ -6372,13 +6414,7 @@
        "        val sessionId = truth.optString(\"session_id\", sourceKey.ifBlank { \"unknown\" })"
        "        val reviewFile = containedLeaf(reviewsDir, \"review-${sha256Hex(sessionId.toByteArray())}.review.json\")"
        "        atomicWriteText(reviewFile, truth.toString(2))"
-       "        val event = JSONObject()"
-       "            .put(\"schema_version\", 1)"
-       "            .put(\"created_at\", System.currentTimeMillis())"
-       "            .put(\"type\", \"save_snapshot\")"
-       "            .put(\"session_id\", sessionId)"
-       "            .put(\"source_key\", sourceKey)"
-       "            .put(\"details\", JSONObject().put(\"ground_truth_path\", truthFile.name))"
+       "        val event = snapshotEventJson(sessionId, sourceKey, truthFile.name)"
        "        appendJsonLine(containedLeaf(eventsDir, \"events-${sha256Hex(sessionId.toByteArray())}.events.jsonl\"), event)"
        "        appendJsonLine(containedLeaf(eventsDir, \"all-events.jsonl\"), event)"
        "        rebuildLearnedExamples()"
@@ -6387,13 +6423,7 @@
        "    }"
        ""
        "    fun appendEvent(type: String, session: SsdSession, details: JSONObject = JSONObject()) {"
-       "        val event = JSONObject()"
-       "            .put(\"schema_version\", 1)"
-       "            .put(\"created_at\", System.currentTimeMillis())"
-       "            .put(\"type\", type)"
-       "            .put(\"session_id\", session.sessionId)"
-       "            .put(\"source_key\", session.sourceKey)"
-       "            .put(\"details\", details)"
+       "        val event = sessionEventJson(type, session, details)"
        "        appendJsonLine(containedLeaf(eventsDir, \"events-${sha256Hex(session.sessionId.toByteArray())}.events.jsonl\"), event)"
        "        appendJsonLine(containedLeaf(eventsDir, \"all-events.jsonl\"), event)"
        "    }"