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feat: add custom log property to resources and interceptors.
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‎.gitignore‎

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@@ -12,3 +12,4 @@ node_modules/
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.imposter
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bin/
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/.vscode/
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/CLAUDE.md

‎core/api/src/main/java/io/gatehill/imposter/plugin/config/resource/AbstractResourceConfig.kt‎

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@@ -48,7 +48,7 @@ import io.gatehill.imposter.plugin.config.capture.CaptureConfigHolder
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import io.gatehill.imposter.plugin.config.capture.ItemCaptureConfig
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import io.gatehill.imposter.plugin.config.security.SecurityConfig
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import io.gatehill.imposter.plugin.config.security.SecurityConfigHolder
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import java.util.UUID
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import java.util.*
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/**
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* Base configuration for plugins and sub-resources.
@@ -68,6 +68,9 @@ abstract class AbstractResourceConfig : BasicResourceConfig, SecurityConfigHolde
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@JsonProperty("response")
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override val responseConfig = ResponseConfig()
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@JsonProperty("log")
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var log: String? = null
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@JsonIgnore
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override var isInterceptor: Boolean = false
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@@ -78,6 +81,6 @@ abstract class AbstractResourceConfig : BasicResourceConfig, SecurityConfigHolde
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override val resourceId by lazy { UUID.randomUUID().toString() }
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override fun toString(): String {
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return "AbstractResourceConfig(path=$path, securityConfig=$securityConfig, captureConfig=$captureConfig, responseConfig=$responseConfig, continueToNext=$continueToNext)"
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return "AbstractResourceConfig(path=$path, securityConfig=$securityConfig, captureConfig=$captureConfig, responseConfig=$responseConfig, log=$log, continueToNext=$continueToNext)"
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}
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}

‎core/engine/src/main/java/io/gatehill/imposter/service/ResponseServiceImpl.kt‎

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@@ -50,6 +50,7 @@ import io.gatehill.imposter.lifecycle.EngineLifecycleHooks
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import io.gatehill.imposter.lifecycle.EngineLifecycleListener
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import io.gatehill.imposter.plugin.config.ContentTypedConfig
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import io.gatehill.imposter.plugin.config.PluginConfig
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import io.gatehill.imposter.plugin.config.resource.AbstractResourceConfig
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import io.gatehill.imposter.plugin.config.resource.BasicResourceConfig
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import io.gatehill.imposter.plugin.config.resource.ResourceConfig
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import io.gatehill.imposter.script.ResponseBehaviour
@@ -227,6 +228,17 @@ class ResponseServiceImpl @Inject constructor(
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} else {
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origResponseData
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}
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// Process custom log message if present
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if (resourceConfig is AbstractResourceConfig && resourceConfig.log != null) {
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val logMessage = if (template) {
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PlaceholderUtil.replace(resourceConfig.log!!, httpExchange, PlaceholderUtil.templateEvaluators)
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} else {
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resourceConfig.log!!
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}
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LOGGER.info("Resource log: {}", logMessage)
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}
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response.end(responseData)
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}
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‎docs/metrics_logs_telemetry.md‎

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@@ -89,6 +89,39 @@ Imposter can log a JSON summary of each request, such as the following:
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To enable this, set the environment variable `IMPOSTER_LOG_SUMMARY=true`.
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### Resource and interceptor logging
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Resources and interceptors can include custom log messages that are processed using the template engine. This allows you to log contextual information about requests that match your resources.
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Add a `log` property to any resource or interceptor:
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```yaml
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plugin: rest
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resources:
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- path: /users/{id}
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method: GET
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log: "User lookup for ID: ${context.request.pathParams.id} from ${context.request.headers.X-Client-ID:-unknown client}"
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response:
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content: '{"id": "${context.request.pathParams.id}", "name": "Test User"}'
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statusCode: 200
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template: true
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interceptors:
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- path: /secured/*
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method: GET
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log: "Secured endpoint accessed by ${context.request.headers.User-Agent} with trace ID: ${context.request.headers.X-Trace-ID:-none provided}"
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response:
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statusCode: 401
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content: "Unauthorized"
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continue: false
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```
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The log message supports all template features including:
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- Path parameters, query parameters, and headers from the request
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- Random data generation and date/time functions
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- Default values with the `:-` syntax
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- JSON and XML processing with JSONPath and XPath
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#### Logging request/response headers
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You can optionally include request and response headers in the JSON summary such as:

‎server/src/test/java/io/gatehill/imposter/server/ResourceLogTest.kt‎

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/*
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* Copyright (c) 2024.
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*
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* This file is part of Imposter.
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*
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* "Commons Clause" License Condition v1.0
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*
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* The Software is provided to you by the Licensor under the License, as
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* defined below, subject to the following condition.
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*
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* Without limiting other conditions in the License, the grant of rights
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* under the License will not include, and the License does not grant to
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* you, the right to Sell the Software.
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*
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* For purposes of the foregoing, "Sell" means practicing any or all of
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* the rights granted to you under the License to provide to third parties,
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* for a fee or other consideration (including without limitation fees for
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* hosting or consulting/support services related to the Software), a
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* product or service whose value derives, entirely or substantially, from
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* the functionality of the Software. Any license notice or attribution
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* required by the License must also include this Commons Clause License
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* Condition notice.
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*
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* Software: Imposter
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*
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* License: GNU Lesser General Public License version 3
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*
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* Licensor: Peter Cornish
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*
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* Imposter is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Imposter is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Imposter. If not, see <https://www.gnu.org/licenses/>.
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*/
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package io.gatehill.imposter.server
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import io.gatehill.imposter.plugin.test.TestPluginImpl
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import io.gatehill.imposter.service.ResponseServiceImpl
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import io.restassured.RestAssured
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import io.vertx.core.Vertx
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import io.vertx.junit5.VertxTestContext
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import org.apache.logging.log4j.Level
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import org.apache.logging.log4j.LogManager
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import org.apache.logging.log4j.core.LogEvent
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import org.apache.logging.log4j.core.Logger
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import org.apache.logging.log4j.core.appender.AbstractAppender
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import org.apache.logging.log4j.core.config.Property
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import org.apache.logging.log4j.core.layout.PatternLayout
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import org.hamcrest.Matchers.equalTo
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import org.junit.jupiter.api.AfterEach
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import org.junit.jupiter.api.Assertions.assertTrue
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import org.junit.jupiter.api.BeforeEach
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import org.junit.jupiter.api.Test
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import java.util.*
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import java.util.concurrent.CopyOnWriteArrayList
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/**
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* Tests for resource logging functionality.
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*/
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class ResourceLogTest : BaseVerticleTest() {
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override val pluginClass = TestPluginImpl::class.java
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private lateinit var memoryAppender: MemoryAppender
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private lateinit var logger: Logger
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@BeforeEach
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override fun setUp(vertx: Vertx, testContext: VertxTestContext) {
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super.setUp(vertx, testContext)
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RestAssured.baseURI = "http://$host:$listenPort"
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RestAssured.enableLoggingOfRequestAndResponseIfValidationFails()
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// Setup logging capture
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logger = LogManager.getLogger(ResponseServiceImpl::class.java) as Logger
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memoryAppender = MemoryAppender("MemoryAppender-${UUID.randomUUID()}")
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memoryAppender.start()
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logger.addAppender(memoryAppender)
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}
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@AfterEach
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fun tearDownLogger() {
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logger.removeAppender(memoryAppender)
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memoryAppender.stop()
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}
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override val testConfigDirs = listOf(
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"/resource-log"
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)
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@Test
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fun `resource should log message with path parameters`() {
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// Clear logs before test
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memoryAppender.clear()
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// Make the request
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RestAssured.given().`when`()
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.get("/resource-log/123")
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.then()
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.statusCode(200)
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.body(equalTo("resource_logged"))
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// Verify log message was captured
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val logEvents = memoryAppender.getLogEvents()
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assertTrue(logEvents.any { event ->
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event.level == Level.INFO &&
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event.message.formattedMessage.contains("Resource log: Resource log message for ID: 123")
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}, "Expected log message with path parameter not found")
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}
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@Test
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fun `interceptor should log message`() {
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// Clear logs before test
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memoryAppender.clear()
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// Make the request
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RestAssured.given().`when`()
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.get("/interceptor-log")
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.then()
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.statusCode(401)
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.body(equalTo("Unauthorized"))
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// Verify log message was captured
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val logEvents = memoryAppender.getLogEvents()
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assertTrue(logEvents.any { event ->
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event.level == Level.INFO &&
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event.message.formattedMessage.contains("Resource log: Interceptor log message")
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}, "Expected interceptor log message not found")
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}
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@Test
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fun `request without log property should not log custom message`() {
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// Clear logs before test
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memoryAppender.clear()
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// Make the request to a path without log property
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RestAssured.given().`when`()
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.get("/simple")
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.then()
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.statusCode(200)
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.body(equalTo("simple"))
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// Verify no custom log message was captured
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val logEvents = memoryAppender.getLogEvents()
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assertTrue(logEvents.none { event ->
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event.level == Level.INFO &&
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event.message.formattedMessage.contains("Resource log:")
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}, "Custom log message found when none was expected")
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}
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/**
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* Custom in-memory appender for capturing log events during tests.
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*/
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class MemoryAppender(name: String) : AbstractAppender(
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name,
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null,
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PatternLayout.createDefaultLayout(),
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false,
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Property.EMPTY_ARRAY
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) {
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private val logEvents = CopyOnWriteArrayList<LogEvent>()
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override fun append(event: LogEvent) {
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logEvents.add(event.toImmutable())
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}
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fun getLogEvents(): List<LogEvent> = logEvents.toList()
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fun clear() {
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logEvents.clear()
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}
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}
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}

‎server/src/test/resources/resource-log/test-plugin-config.yaml‎

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plugin: "io.gatehill.imposter.plugin.test.TestPluginImpl"
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interceptors:
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- path: /interceptor-log
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method: GET
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log: "Interceptor log message"
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continue: false
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response:
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statusCode: 401
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content: "Unauthorized"
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resources:
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- path: /resource-log/{id}
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method: GET
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log: "Resource log message for ID: ${context.request.pathParams.id}"
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response:
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content: "resource_logged"
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- path: /simple
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method: GET
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response:
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content: "simple"
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- path: /*
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method: GET
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response:
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content: "default"

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