2 * Copyright (c) 2010-2022 Contributors to the openHAB project
4 * See the NOTICE file(s) distributed with this work for additional
7 * This program and the accompanying materials are made available under the
8 * terms of the Eclipse Public License 2.0 which is available at
9 * http://www.eclipse.org/legal/epl-2.0
11 * SPDX-License-Identifier: EPL-2.0
13 package org.openhab.automation.jrubyscripting.internal;
16 import java.nio.file.Path;
17 import java.nio.file.Paths;
18 import java.util.Collections;
19 import java.util.List;
21 import java.util.Optional;
22 import java.util.stream.Collectors;
23 import java.util.stream.Stream;
25 import javax.script.ScriptEngine;
26 import javax.script.ScriptEngineFactory;
27 import javax.script.ScriptException;
29 import org.eclipse.jdt.annotation.NonNullByDefault;
30 import org.eclipse.jdt.annotation.Nullable;
31 import org.openhab.core.OpenHAB;
32 import org.slf4j.Logger;
33 import org.slf4j.LoggerFactory;
36 * Processes JRuby Configuration Parameters.
38 * @author Brian O'Connell - Initial contribution
39 * @author Jimmy Tanagra - Add $LOAD_PATH, require injection
42 public class JRubyScriptEngineConfiguration {
44 private final Logger logger = LoggerFactory.getLogger(JRubyScriptEngineConfiguration.class);
46 private static final Path DEFAULT_GEM_HOME = Paths.get(OpenHAB.getConfigFolder(), "scripts", "lib", "ruby",
49 private static final Path DEFAULT_RUBYLIB = Paths.get(OpenHAB.getConfigFolder(), "automation", "lib", "ruby");
51 private static final String GEM_HOME = "gem_home";
52 private static final String RUBYLIB = "rubylib";
53 private static final String GEMS = "gems";
54 private static final String REQUIRE = "require";
55 private static final String CHECK_UPDATE = "check_update";
57 // Map of configuration parameters
58 private static final Map<String, OptionalConfigurationElement> CONFIGURATION_PARAMETERS = Map.ofEntries(
59 Map.entry("local_context",
60 new OptionalConfigurationElement.Builder(OptionalConfigurationElement.Type.SYSTEM_PROPERTY)
61 .mappedTo("org.jruby.embed.localcontext.scope").defaultValue("singlethread").build()),
63 Map.entry("local_variable",
64 new OptionalConfigurationElement.Builder(OptionalConfigurationElement.Type.SYSTEM_PROPERTY)
65 .mappedTo("org.jruby.embed.localvariable.behavior").defaultValue("transient").build()),
68 new OptionalConfigurationElement.Builder(OptionalConfigurationElement.Type.RUBY_ENVIRONMENT)
69 .mappedTo("GEM_HOME").defaultValue(DEFAULT_GEM_HOME.toString()).build()),
72 new OptionalConfigurationElement.Builder(OptionalConfigurationElement.Type.RUBY_ENVIRONMENT)
73 .mappedTo("RUBYLIB").defaultValue(DEFAULT_RUBYLIB.toString()).build()),
75 Map.entry(GEMS, new OptionalConfigurationElement.Builder(OptionalConfigurationElement.Type.GEM).build()),
78 new OptionalConfigurationElement.Builder(OptionalConfigurationElement.Type.REQUIRE).build()),
80 Map.entry(CHECK_UPDATE,
81 new OptionalConfigurationElement.Builder(OptionalConfigurationElement.Type.CHECK_UPDATE).build()));
83 private static final Map<OptionalConfigurationElement.Type, List<OptionalConfigurationElement>> CONFIGURATION_TYPE_MAP = CONFIGURATION_PARAMETERS
84 .values().stream().collect(Collectors.groupingBy(v -> v.type));
87 * Update configuration
89 * @param config Configuration parameters to apply to ScriptEngine
90 * @param factory ScriptEngineFactory to configure
92 void update(Map<String, Object> config, ScriptEngineFactory factory) {
93 logger.trace("JRuby Script Engine Configuration: {}", config);
94 config.forEach(this::processConfigValue);
95 configureScriptEngine(factory);
99 * Apply configuration key/value to known configuration parameters
101 * @param key Configuration key
102 * @param value Configuration value
104 private void processConfigValue(String key, Object value) {
105 OptionalConfigurationElement configurationElement = CONFIGURATION_PARAMETERS.get(key);
106 if (configurationElement != null) {
107 configurationElement.setValue(value.toString());
109 logger.debug("Ignoring unexpected configuration key: {}", key);
114 * Configure the ScriptEngine
116 * @param factory Script Engine to configure
118 void configureScriptEngine(ScriptEngineFactory factory) {
119 configureSystemProperties();
121 ScriptEngine engine = factory.getScriptEngine();
122 configureRubyEnvironment(engine);
123 configureGems(engine);
127 * Makes Gem home directory if it does not exist
129 private void ensureGemHomeExists() {
130 OptionalConfigurationElement gemHomeConfigElement = CONFIGURATION_PARAMETERS.get(GEM_HOME);
131 if (gemHomeConfigElement == null) {
134 Optional<String> gemHome = gemHomeConfigElement.getValue();
135 if (gemHome.isPresent()) {
136 File gemHomeDirectory = new File(gemHome.get());
137 if (!gemHomeDirectory.exists()) {
138 logger.debug("gem_home directory does not exist, creating");
139 if (!gemHomeDirectory.mkdirs()) {
140 logger.warn("Error creating gem_home directory");
144 logger.debug("Gem install requested without gem_home specified, not ensuring gem_home path exists");
149 * Install a gems in ScriptEngine
151 * @param engine Engine to install gems
153 private synchronized void configureGems(ScriptEngine engine) {
154 ensureGemHomeExists();
156 OptionalConfigurationElement gemsConfigElement = CONFIGURATION_PARAMETERS.get(GEMS);
157 if (gemsConfigElement == null || !gemsConfigElement.getValue().isPresent()) {
160 boolean checkUpdate = true;
161 OptionalConfigurationElement updateConfigElement = CONFIGURATION_PARAMETERS.get(CHECK_UPDATE);
162 if (updateConfigElement != null && updateConfigElement.getValue().isPresent()) {
163 checkUpdate = updateConfigElement.getValue().get().equals("true");
166 String[] gems = gemsConfigElement.getValue().get().split(",");
167 String gemCommand = "require 'bundler/inline'\nrequire 'openssl'\n\ngemfile(" + checkUpdate + ") do\n"
168 + " source 'https://rubygems.org/'\n";
170 for (String gem : gems) {
173 if (gem.contains("=")) {
174 String[] gemParts = gem.split("=");
175 gem = gemParts[0].trim();
176 version = gemParts[1].trim();
183 gemCommand += " gem '" + gem + "'";
184 if (!version.isEmpty()) {
185 gemCommand += ", '" + version + "'";
187 gemCommand += ", require: false\n";
190 if (validGems == 0) {
193 gemCommand += "end\n";
196 logger.debug("Installing Gems");
197 logger.trace("Gem install code:\n{}", gemCommand);
198 engine.eval(gemCommand);
199 } catch (ScriptException e) {
200 logger.warn("Error installing Gems: {}", e.getMessage());
205 * Execute ruby require statement in the ScriptEngine
207 * @param engine Engine to insert the require statements
209 public void injectRequire(ScriptEngine engine) {
210 OptionalConfigurationElement requireConfigElement = CONFIGURATION_PARAMETERS.get(REQUIRE);
211 if (requireConfigElement == null || !requireConfigElement.getValue().isPresent()) {
215 Stream.of(requireConfigElement.getValue().get().split(",")).map(s -> s.trim()).filter(s -> !s.isEmpty())
217 final String requireStatement = String.format("require '%s'", script);
219 logger.trace("Injecting require statement: {}", requireStatement);
220 engine.eval(requireStatement);
221 } catch (ScriptException e) {
222 logger.warn("Error evaluating statement {}: {}", requireStatement, e.getMessage());
228 * Configure the optional elements of the Ruby Environment
230 * @param engine Engine in which to configure environment
232 public ScriptEngine configureRubyEnvironment(ScriptEngine engine) {
233 getConfigurationElements(OptionalConfigurationElement.Type.RUBY_ENVIRONMENT).forEach(configElement -> {
234 final String environmentSetting = String.format("ENV['%s']='%s'", configElement.mappedTo().get(),
235 configElement.getValue().get());
237 logger.trace("Setting Ruby environment with code: {} ", environmentSetting);
238 engine.eval(environmentSetting);
239 } catch (ScriptException e) {
240 logger.warn("Error setting ruby environment", e);
244 configureRubyLib(engine);
249 * Split up and insert ENV['RUBYLIB'] into Ruby's $LOAD_PATH
250 * This needs to be called after ENV['RUBYLIB'] has been set by configureRubyEnvironment
252 * @param engine Engine in which to configure environment
254 private void configureRubyLib(ScriptEngine engine) {
255 OptionalConfigurationElement rubyLibConfigElement = CONFIGURATION_PARAMETERS.get(RUBYLIB);
256 if (rubyLibConfigElement == null) {
260 Optional<String> rubyLib = rubyLibConfigElement.getValue();
261 if (rubyLib.isPresent() && !rubyLib.get().trim().isEmpty()) {
262 final String code = "$LOAD_PATH.unshift *ENV['RUBYLIB']&.split(File::PATH_SEPARATOR)" + //
263 "&.reject(&:empty?)" + //
264 "&.reject { |path| $LOAD_PATH.include?(path) }"; //
267 } catch (ScriptException exception) {
268 logger.warn("Error setting $LOAD_PATH from RUBYLIB='{}': {}", rubyLib.get(), exception.getMessage());
274 * Configure system properties
276 * @param optionalConfigurationElements Optional system properties to configure
278 private void configureSystemProperties() {
279 getConfigurationElements(OptionalConfigurationElement.Type.SYSTEM_PROPERTY).forEach(configElement -> {
280 String systemProperty = configElement.mappedTo().get();
281 String propertyValue = configElement.getValue().get();
282 logger.trace("Setting system property ({}) to ({})", systemProperty, propertyValue);
283 System.setProperty(systemProperty, propertyValue);
287 private Stream<OptionalConfigurationElement> getConfigurationElements(
288 OptionalConfigurationElement.Type configurationType) {
289 return CONFIGURATION_TYPE_MAP
290 .getOrDefault(configurationType, Collections.<OptionalConfigurationElement> emptyList()).stream()
291 .filter(element -> element.getValue().isPresent());
295 * Inner static companion class for configuration elements
297 private static class OptionalConfigurationElement {
299 private final Optional<String> defaultValue;
300 private final Optional<String> mappedTo;
301 private final Type type;
302 private Optional<String> value;
304 private OptionalConfigurationElement(Type type, @Nullable String mappedTo, @Nullable String defaultValue) {
306 this.defaultValue = Optional.ofNullable(defaultValue);
307 this.mappedTo = Optional.ofNullable(mappedTo);
308 value = Optional.empty();
311 private Optional<String> getValue() {
312 return value.or(() -> defaultValue);
315 private void setValue(String value) {
316 this.value = Optional.of(value);
319 private Optional<String> mappedTo() {
331 private static class Builder {
332 private final Type type;
333 private @Nullable String defaultValue = null;
334 private @Nullable String mappedTo = null;
336 private Builder(Type type) {
340 private Builder mappedTo(String mappedTo) {
341 this.mappedTo = mappedTo;
345 private Builder defaultValue(String value) {
346 this.defaultValue = value;
350 private OptionalConfigurationElement build() {
351 return new OptionalConfigurationElement(type, mappedTo, defaultValue);