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Configuration from file or environment variables (#106)
* VisualRegressionTrackerConfigBuilder extended to support config file and env variables
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5 files changed

+296
-16
lines changed

5 files changed

+296
-16
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‎build.gradle‎

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@@ -32,6 +32,7 @@ dependencies {
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testImplementation 'commons-io:commons-io:2.11.0'
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testImplementation 'org.mockito:mockito-core:4.4.0'
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testImplementation 'com.squareup.okhttp3:mockwebserver:4.9.3'
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testImplementation 'uk.org.webcompere:system-stubs-testng:2.1.3'
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}
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test {

‎src/main/java/io/visual_regression_tracker/sdk_java/VisualRegressionTracker.java‎

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@@ -7,6 +7,7 @@
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import io.visual_regression_tracker.sdk_java.response.TestRunResponse;
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import lombok.extern.slf4j.Slf4j;
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import java.io.File;
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import java.io.IOException;
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import java.net.URI;
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import java.net.http.HttpClient;
@@ -24,6 +25,7 @@ enum METHOD {
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public class VisualRegressionTracker {
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private static final String TRACKER_NOT_STARTED = "Visual Regression Tracker has not been started";
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private static final String CONFIG_FILE_NAME = "vrt.json";
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protected static final String API_KEY_HEADER = "apiKey";
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protected static final String PROJECT_HEADER = "project";
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protected Gson gson;
@@ -32,6 +34,17 @@ public class VisualRegressionTracker {
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protected String buildId;
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protected String projectId;
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public VisualRegressionTracker() {
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VisualRegressionTrackerConfig.VisualRegressionTrackerConfigBuilder configBuilder = VisualRegressionTrackerConfig.builder();
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File configFile = new File(CONFIG_FILE_NAME);
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if (configFile.exists()) {
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configBuilder.configFile(configFile);
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}
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configuration = configBuilder.build();
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paths = new PathProvider(configuration.getApiUrl());
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gson = new Gson();
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}
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public VisualRegressionTracker(VisualRegressionTrackerConfig trackerConfig) {
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configuration = trackerConfig;
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paths = new PathProvider(trackerConfig.getApiUrl());

‎src/main/java/io/visual_regression_tracker/sdk_java/VisualRegressionTrackerConfig.java‎

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@@ -1,15 +1,26 @@
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package io.visual_regression_tracker.sdk_java;
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import lombok.AllArgsConstructor;
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import lombok.Builder;
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import lombok.Data;
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import lombok.NonNull;
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import lombok.RequiredArgsConstructor;
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@Data
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@Builder
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import com.google.gson.Gson;
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import com.google.gson.reflect.TypeToken;
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import lombok.*;
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import lombok.experimental.Accessors;
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import lombok.extern.slf4j.Slf4j;
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import java.io.File;
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import java.io.IOException;
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import java.lang.reflect.Field;
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import java.lang.reflect.Type;
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import java.nio.charset.StandardCharsets;
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import java.nio.file.Files;
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import java.util.Collections;
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import java.util.Map;
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import java.util.function.Function;
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@Data()
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@RequiredArgsConstructor
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@AllArgsConstructor
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@Accessors(chain = true)
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@Slf4j
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public class VisualRegressionTrackerConfig {
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@NonNull
@@ -18,12 +29,145 @@ public class VisualRegressionTrackerConfig {
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private final String apiKey;
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@NonNull
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private final String project;
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@Builder.Default
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private String branchName = null;
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@Builder.Default
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private String ciBuildId = null;
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@Builder.Default
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private Boolean enableSoftAssert = false;
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@Builder.Default
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private int httpTimeoutInSeconds = 10;
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private String branchName;
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private String ciBuildId;
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private Boolean enableSoftAssert;
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private int httpTimeoutInSeconds;
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public static VisualRegressionTrackerConfigBuilder builder() {
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return new VisualRegressionTrackerConfigBuilder();
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}
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public static class VisualRegressionTrackerConfigBuilder {
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private String apiUrl;
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private String apiKey;
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private String project;
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private String branchName;
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private String ciBuildId;
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private Boolean enableSoftAssert;
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private Integer httpTimeoutInSeconds;
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private File configFile;
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private static final String VRT_ENV_VARIABLE_PREFIX = "VRT_";
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private static final boolean DEFAULT_SOFT_ASSERTION_STATE = false;
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private static final int DEFAULT_HTTP_TIMEOUT_SECONDS = 10;
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public VisualRegressionTrackerConfigBuilder apiUrl(String apiUrl) {
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this.apiUrl = apiUrl;
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return this;
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}
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public VisualRegressionTrackerConfigBuilder apiKey(String apiKey) {
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this.apiKey = apiKey;
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return this;
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}
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public VisualRegressionTrackerConfigBuilder project(String project) {
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this.project = project;
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return this;
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}
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public VisualRegressionTrackerConfigBuilder branchName(String branchName) {
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this.branchName = branchName;
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return this;
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}
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public VisualRegressionTrackerConfigBuilder ciBuildId(String ciBuildId) {
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this.ciBuildId = ciBuildId;
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return this;
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}
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public VisualRegressionTrackerConfigBuilder enableSoftAssert(Boolean enableSoftAssert) {
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this.enableSoftAssert = enableSoftAssert;
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return this;
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}
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public VisualRegressionTrackerConfigBuilder httpTimeoutInSeconds(int httpTimeoutInSeconds) {
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this.httpTimeoutInSeconds = httpTimeoutInSeconds;
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return this;
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}
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public VisualRegressionTrackerConfigBuilder configFile(File configFile) {
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this.configFile = configFile;
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return this;
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}
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public VisualRegressionTrackerConfig build() {
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Map<String, Object> configFromFile = Collections.emptyMap();
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if (configFile != null) {
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configFromFile = readConfigFromFile(configFile);
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}
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String actualApiUrl = resolve("apiUrl", configFromFile);
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String actualApiKey = resolve("apiKey", configFromFile);
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String actualProject = resolve("project", configFromFile);
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VisualRegressionTrackerConfig config = new VisualRegressionTrackerConfig(actualApiUrl, actualApiKey, actualProject);
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config.setCiBuildId(resolve("ciBuildId", configFromFile));
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config.setBranchName(resolve("branchName", configFromFile));
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Boolean actualEnableSoftAssert = resolve("enableSoftAssert", configFromFile);
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config.setEnableSoftAssert(actualEnableSoftAssert == null ? DEFAULT_SOFT_ASSERTION_STATE : actualEnableSoftAssert);
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Integer actualHttpTimeoutInSeconds = resolve("httpTimeoutInSeconds", configFromFile);
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config.setHttpTimeoutInSeconds(actualHttpTimeoutInSeconds == null ? DEFAULT_HTTP_TIMEOUT_SECONDS : actualHttpTimeoutInSeconds);
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return config;
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}
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private Map<String, Object> readConfigFromFile(File configFile) {
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if (!configFile.exists()) {
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throw new IllegalArgumentException("File " + configFile + " doesn't exist");
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}
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String fileContent;
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try {
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fileContent = Files.readString(configFile.toPath(), StandardCharsets.UTF_8);
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} catch (IOException e) {
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throw new IllegalArgumentException("Can't read content of provided config file", e);
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}
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Type mapType = new TypeToken<Map<String, Object>>() {}.getType();
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return new Gson().fromJson(fileContent, mapType);
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}
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@SneakyThrows
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private <T> T resolve(String propertyName, Map<String, Object> configurationFromFile) {
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// 1. check if it was initialized explicitly in builder
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// 2. check if env variable exists
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// 3. try to read from file as last resort
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Field field = this.getClass().getDeclaredField(propertyName);
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Object propertyValue = field.get(this);
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if (propertyValue != null) {
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return (T) propertyValue;
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}
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String environmentVariableName = VRT_ENV_VARIABLE_PREFIX + propertyName.toUpperCase();
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propertyValue = System.getenv(environmentVariableName);
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if (propertyValue != null) {
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log.debug("Value of '{}' resolved from environment variable {}", propertyName, environmentVariableName);
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Function<String, ?> parser = findParser(field.getType());
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return (T) parser.apply((String)propertyValue);
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}
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propertyValue = configurationFromFile.get(propertyName);
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if (propertyValue != null) {
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log.debug("Value of '{}' resolved from config file", propertyName);
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}
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return propertyValue == null ? null : (T) propertyValue;
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}
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private Function<String, ?> findParser(Class<?> cls) {
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if (cls.equals(Boolean.class)) {
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return Boolean::parseBoolean;
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}
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if (cls.equals(Integer.class)) {
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return Integer::parseInt;
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}
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return String::valueOf;
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}
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}
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}

‎src/test/java/io/visual_regression_tracker/sdk_java/VisualRegressionTrackerConfigTest.java‎

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@@ -0,0 +1,114 @@
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package io.visual_regression_tracker.sdk_java;
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import org.testng.annotations.Test;
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import uk.org.webcompere.systemstubs.environment.EnvironmentVariables;
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import java.io.File;
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import static org.hamcrest.CoreMatchers.is;
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import static org.hamcrest.MatcherAssert.assertThat;
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public class VisualRegressionTrackerConfigTest {
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@Test(expectedExceptions = NullPointerException.class,
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expectedExceptionsMessageRegExp = "apiKey is marked non-null but is null")
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public void shouldThrowExceptionIfApiKeyMissed() {
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VisualRegressionTrackerConfig
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.builder()
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.apiUrl("")
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.project("")
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.build();
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}
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@Test(expectedExceptions = NullPointerException.class,
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expectedExceptionsMessageRegExp = "apiUrl is marked non-null but is null")
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public void shouldThrowExceptionIfApiUrlMissed() {
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VisualRegressionTrackerConfig
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.builder()
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.apiKey("")
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.project("")
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.build();
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}
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@Test(expectedExceptions = NullPointerException.class,
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expectedExceptionsMessageRegExp = "project is marked non-null but is null")
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public void shouldThrowExceptionIfProjectMissed() {
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VisualRegressionTrackerConfig
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.builder()
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.apiKey("")
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.apiUrl("")
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.build();
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}
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@Test
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public void shouldBeCreatedFromConfigFile() {
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File configFile = new File("src/test/resources/vrt_config_example.json");
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VisualRegressionTrackerConfig config = VisualRegressionTrackerConfig.builder()
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.configFile(configFile)
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.build();
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assertThat(config.getApiKey(), is("SECRET"));
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assertThat(config.getApiUrl(), is("http://162.243.161.172:4200"));
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assertThat(config.getProject(), is("VRT"));
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assertThat(config.getBranchName(), is("master"));
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assertThat(config.getEnableSoftAssert(), is(false));
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assertThat(config.getCiBuildId(), is("SOME_UNIQUE_ID"));
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}
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@Test
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public void shouldBeCreatedFromEnvironment() throws Exception {
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EnvironmentVariables environmentVariables = new EnvironmentVariables("VRT_APIKEY", "SECRET")
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.set("VRT_APIURL", "http://162.243.161.172:4200")
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.set("VRT_PROJECT", "VRT")
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.set("VRT_BRANCHNAME", "master")
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.set("VRT_ENABLESOFTASSERT", "false")
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.set("VRT_CIBUILDID", "SOME_UNIQUE_ID");
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VisualRegressionTrackerConfig config = environmentVariables.execute(() ->
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VisualRegressionTrackerConfig.builder()
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.build()
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);
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assertThat(config.getApiKey(), is("SECRET"));
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assertThat(config.getApiUrl(), is("http://162.243.161.172:4200"));
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assertThat(config.getProject(), is("VRT"));
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assertThat(config.getBranchName(), is("master"));
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assertThat(config.getEnableSoftAssert(), is(false));
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assertThat(config.getCiBuildId(), is("SOME_UNIQUE_ID"));
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}
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@Test
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public void shouldResolveFinalValuesInTheRightOrder() throws Exception {
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EnvironmentVariables environmentVariables = new EnvironmentVariables("VRT_APIKEY", "ENV_SECRET")
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.set("VRT_APIURL", "http://162.243.161.172:4201");
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File configFile = new File("src/test/resources/vrt_config_example.json");
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VisualRegressionTrackerConfig config = environmentVariables.execute(() ->
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VisualRegressionTrackerConfig.builder()
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.apiUrl("http://localhost:4200")
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.configFile(configFile)
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.build()
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);
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assertThat(config.getApiKey(), is("ENV_SECRET"));
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assertThat(config.getApiUrl(), is("http://localhost:4200"));
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assertThat(config.getProject(), is("VRT"));
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assertThat(config.getBranchName(), is("master"));
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assertThat(config.getEnableSoftAssert(), is(false));
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assertThat(config.getCiBuildId(), is("SOME_UNIQUE_ID"));
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}
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@Test
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public void shouldUseDefaultValuesIfNotProvided() {
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VisualRegressionTrackerConfig config = VisualRegressionTrackerConfig.builder()
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.apiUrl("http://localhost:4200")
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.apiKey("KEY")
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.project("PROJECT")
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.build();
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assertThat(config.getEnableSoftAssert(), is(false));
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assertThat(config.getHttpTimeoutInSeconds(), is(10));
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}
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}

‎src/test/resources/vrt_config_example.json‎

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{
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"apiUrl": "http://162.243.161.172:4200",
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"project": "VRT",
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"apiKey": "SECRET",
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"branchName": "master",
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"enableSoftAssert": false,
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"ciBuildId": "SOME_UNIQUE_ID"
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}

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