solution: test accesslog writer

src/test/groovy/io/emeraldpay/dshackle/monitoring/accesslog/AccessLogWriterSpec.groovy

@@ -0,0 +1,53 @@
+package io.emeraldpay.dshackle.monitoring.accesslog
+
+import com.fasterxml.jackson.databind.ObjectMapper
+import io.emeraldpay.dshackle.Global
+import io.emeraldpay.dshackle.config.AccessLogConfig
+import io.emeraldpay.dshackle.config.MainConfig
+import io.emeraldpay.grpc.Chain
+import spock.lang.Specification
+
+import java.time.Instant
+
+class AccessLogWriterSpec extends Specification {
+
+    def "writes log event"() {
+        setup:
+        File dir = File.createTempDir("dshackle-test-")
+        File accessLog = new File(dir, "accesslog.jsonl")
+        println("Write access log to $accessLog.absolutePath")
+        MainConfig config = new MainConfig()
+        config.accessLogConfig = new AccessLogConfig(true).tap {
+            it.filename = accessLog.absolutePath
+        }
+        AccessLogWriter logWriter = new AccessLogWriter(config)
+
+        when:
+        def event = new Events.Status(
+                Chain.ETHEREUM, UUID.fromString("9d8ecbf3-12fb-49cf-af9d-949a1050a000"),
+                new Events.StreamRequestDetails(
+                        UUID.fromString("9d8ecbf3-12fb-49cf-af9d-949a1050a000"),
+                        Instant.ofEpochMilli(1626746880123),
+                        new Events.Remote(
+                                ["127.0.0.1", "172.217.8.78"], "172.217.8.78", "UnitTest"
+                        )
+                )
+        )
+        logWriter.submit([event])
+        logWriter.flush()
+        def act = accessLog.readLines()
+        then:
+        act.size() == 1
+        with(act[0]) {
+            def json = Global.objectMapper.readValue(it, Map)
+            json["version"] == "accesslog/v1beta"
+            json["id"] == "9d8ecbf3-12fb-49cf-af9d-949a1050a000"
+            json["method"] == "Status"
+            json["blockchain"] == "ETHEREUM"
+            json["request"]["start"] == "2021-07-20T02:08:00.123Z"
+            json["request"]["id"] == "9d8ecbf3-12fb-49cf-af9d-949a1050a000"
+            json["request"]["remote"]["ip"] == "172.217.8.78"
+            json["request"]["remote"]["userAgent"] == "UnitTest"
+        }
+    }
+}