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Core of the implementation of MicroProfile Config specification
/*
* Copyright (c) 2020, 2023 Oracle and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.helidon.config.mp;
import java.io.File;
import java.lang.System.Logger.Level;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.net.URI;
import java.net.URL;
import java.nio.charset.Charset;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.time.Duration;
import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.OffsetDateTime;
import java.time.OffsetTime;
import java.time.Period;
import java.time.YearMonth;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.util.Calendar;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.OptionalDouble;
import java.util.OptionalInt;
import java.util.OptionalLong;
import java.util.ServiceLoader;
import java.util.SimpleTimeZone;
import java.util.TimeZone;
import java.util.UUID;
import java.util.regex.Pattern;
import io.helidon.common.Builder;
import io.helidon.common.HelidonServiceLoader;
import io.helidon.config.ConfigException;
import io.helidon.config.ConfigMappers;
import io.helidon.config.ConfigValue;
import io.helidon.config.metadata.Configured;
import io.helidon.config.metadata.ConfiguredOption;
import io.helidon.config.mp.spi.MpConfigFilter;
import io.helidon.config.mp.spi.MpConfigSourceProvider;
import io.helidon.config.mp.spi.MpMetaConfigProvider;
import org.eclipse.microprofile.config.Config;
import org.eclipse.microprofile.config.spi.ConfigBuilder;
import org.eclipse.microprofile.config.spi.ConfigSource;
import org.eclipse.microprofile.config.spi.ConfigSourceProvider;
import org.eclipse.microprofile.config.spi.Converter;
import static io.helidon.config.mp.MpMetaConfig.MetaConfigSource;
/**
* Configuration builder.
*/
@Configured(prefix = "mp.config", root = true)
class MpConfigBuilder implements Builder, ConfigBuilder {
private static final System.Logger LOGGER = System.getLogger(MpConfigBuilder.class.getName());
private static final String DEFAULT_CONFIG_SOURCE = "META-INF/microprofile-config.properties";
private static final Map MP_META_PROVIDERS;
static {
List mpMetaConfigProviders =
HelidonServiceLoader.builder(ServiceLoader.load(MpMetaConfigProvider.class))
.addService(new MpEnvironmentVariablesMetaConfigProvider())
.addService(new MpSystemPropertiesMetaConfigProvider())
.addService(new MpPropertiesMetaConfigProvider())
.build()
.asList();
// Helidon service loader uses Weight and Weighted by default, we want to use priorities here
Priorities.sort(mpMetaConfigProviders, Prioritized.DEFAULT_PRIORITY);
Map theMap = new HashMap<>();
// ordered by priority
for (MpMetaConfigProvider mpMetaConfigProvider : mpMetaConfigProviders) {
for (String supportedType : mpMetaConfigProvider.supportedTypes()) {
theMap.putIfAbsent(supportedType, mpMetaConfigProvider);
}
}
MP_META_PROVIDERS = Map.copyOf(theMap);
}
private final List sources = new LinkedList<>();
private final List converters = new LinkedList<>();
private ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
private boolean useDefaultSources = false;
private boolean useDiscoveredSources = false;
private boolean useDiscoveredConverters = false;
private String profile;
MpConfigBuilder() {
}
private static File toFile(String value) {
return new File(value);
}
private static Path toPath(String value) {
return Paths.get(value);
}
private static Class toClass(String stringValue) {
try {
return Class.forName(stringValue);
} catch (ClassNotFoundException e) {
throw new IllegalArgumentException("Failed to convert property " + stringValue + " to class", e);
}
}
private static char toChar(String stringValue) {
if (stringValue.length() != 1) {
throw new IllegalArgumentException("The string to map must be a single character, but is: " + stringValue);
}
return stringValue.charAt(0);
}
private static Class getConverterType(Class converterClass) {
Class type = doGetType(converterClass);
if (null == type) {
throw new IllegalArgumentException("Converter " + converterClass + " must be a ParameterizedType.");
}
return type;
}
private static Class doGetType(Class clazz) {
if (clazz.equals(Object.class)) {
return null;
}
Type[] genericInterfaces = clazz.getGenericInterfaces();
for (Type genericInterface : genericInterfaces) {
if (genericInterface instanceof ParameterizedType) {
ParameterizedType pt = (ParameterizedType) genericInterface;
if (pt.getRawType().equals(Converter.class)) {
Type[] typeArguments = pt.getActualTypeArguments();
if (typeArguments.length != 1) {
throw new IllegalStateException("Converter " + clazz + " must be a ParameterizedType.");
}
Type typeArgument = typeArguments[0];
if (typeArgument instanceof Class) {
return (Class) typeArgument;
}
throw new IllegalStateException("Converter " + clazz + " must convert to a class, not " + typeArgument);
}
}
}
return doGetType(clazz.getSuperclass());
}
@Override
public ConfigBuilder addDefaultSources() {
useDefaultSources = true;
return this;
}
@Override
public ConfigBuilder addDiscoveredSources() {
useDiscoveredSources = true;
return this;
}
@Override
public ConfigBuilder addDiscoveredConverters() {
useDiscoveredConverters = true;
return this;
}
@Override
public ConfigBuilder forClassLoader(ClassLoader loader) {
this.classLoader = loader;
return this;
}
@Override
public ConfigBuilder withSources(ConfigSource... sources) {
for (ConfigSource source : sources) {
this.sources.add(new OrdinalSource(source));
}
return this;
}
@Override
public ConfigBuilder withConverter(Class aClass, int ordinal, Converter converter) {
this.converters.add(new OrdinalConverter(converter, aClass, ordinal));
return this;
}
@Override
public ConfigBuilder withConverters(Converter... converters) {
for (Converter converter : converters) {
this.converters.add(new OrdinalConverter(converter));
}
return this;
}
void mpMetaConfig(io.helidon.config.Config meta) {
meta.get("profile")
.asString()
.ifPresent(this::profile);
meta.get("add-discovered-sources")
.asBoolean()
.filter(it -> it)
.ifPresent(it -> addDiscoveredSources());
meta.get("add-discovered-converters")
.asBoolean()
.filter(it -> it)
.ifPresent(it -> addDiscoveredConverters());
meta.get("add-default-sources")
.asBoolean()
.filter(it -> it)
.ifPresent(it -> addDefaultSources());
meta.get("sources")
.asNodeList()
.ifPresent(this::processMetaSources);
}
private void processMetaSources(List configs) {
for (io.helidon.config.Config config : configs) {
String type = config.get("type").asString()
.orElseThrow(() -> new ConfigException("Meta configuration sources must have a \"type\" property defined"));
MpMetaConfigProvider mpMetaConfigProvider = MP_META_PROVIDERS.get(type);
if (mpMetaConfigProvider == null) {
throw new ConfigException("Wrong meta configuration, type " + type
+ " not supported, only supporting: " + MP_META_PROVIDERS.keySet());
}
List delegates = mpMetaConfigProvider.create(type, config, profile);
boolean shouldCount = delegates.size() > 1;
int counter = 0;
for (ConfigSource delegate : delegates) {
MetaConfigSource.Builder builder = MetaConfigSource.builder()
.delegate(delegate);
config.get("ordinal").asInt().ifPresent(builder::ordinal);
ConfigValue name = config.get("name").asString();
if (shouldCount) {
if (name.isPresent()) {
// multiple instances - count them
builder.name(name.get() + "_" + counter++);
}
} else {
name.ifPresent(builder::name);
}
withSources(builder.build());
}
}
}
@Override
public Config build() {
// the build method MUST NOT modify builder state, as it may be called more than once
// there are three lists used by the configuration:
// sources
// converters
// filters
List ordinalSources = new LinkedList<>(sources);
List ordinalConverters = new LinkedList<>(converters);
List targetFilters = HelidonServiceLoader.create(ServiceLoader.load(MpConfigFilter.class))
.asList();
/*
Converters
*/
addBuiltInConverters(ordinalConverters);
if (useDiscoveredConverters) {
addDiscoveredConverters(ordinalConverters);
}
/*
Config sources
*/
if (useDefaultSources) {
addDefaultSources(ordinalSources);
}
if (useDiscoveredSources) {
addDiscoveredSources(ordinalSources);
}
// now it is from lowest to highest
ordinalSources.sort(Comparator.comparingInt(o -> o.ordinal));
ordinalConverters.sort(Comparator.comparingInt(o -> o.ordinal));
// revert to have the first one the most significant
Collections.reverse(ordinalSources);
Collections.reverse(ordinalConverters);
if (LOGGER.isLoggable(Level.TRACE)) {
LOGGER.log(Level.TRACE, "The following config sources are used (ordered): " + ordinalSources);
}
List targetSources = new LinkedList<>();
HashMap, Converter> targetConverters = new HashMap<>();
ordinalSources.forEach(ordinal -> targetSources.add(ordinal.source));
ordinalConverters.forEach(ordinal -> targetConverters.putIfAbsent(ordinal.type, ordinal.converter));
MpConfigImpl result = new MpConfigImpl(targetSources, targetConverters, targetFilters, profile);
// if we already have a profile configured, we have loaded it and can safely return
if (profile != null) {
if (LOGGER.isLoggable(Level.DEBUG)) {
LOGGER.log(Level.DEBUG, "Built MP config for profile " + profile);
}
return result;
}
// let's see if there is a profile configured
String configuredProfile = result.getOptionalValue("mp.config.profile", String.class).orElse(null);
// nope, return the result
if (configuredProfile == null) {
LOGGER.log(Level.DEBUG, "Built MP config with no profile");
return result;
} else {
if (LOGGER.isLoggable(Level.TRACE)) {
LOGGER.log(Level.TRACE, "MP profile configured, rebuilding: " + configuredProfile);
}
}
// yes, update it and re-build with profile information
profile(configuredProfile);
return build();
}
/**
* Configure an explicit profile name. Profile is used to load configuration (when default sources are enabled) from
* {@code microprofile-config-${profile}.properties} and to use properties named {@code %${profile}.propertyName}
* before the actual property name.
*
* @param profile name of the profile, such as {@code dev, test}
* @return updated builder instance
*/
@ConfiguredOption(key = "profile", type = String.class, description = "Configure an explicit profile name.")
public MpConfigBuilder profile(String profile) {
this.profile = profile;
return this;
}
private void addDiscoveredSources(List targetConfigSources) {
ServiceLoader.load(ConfigSource.class)
.forEach(it -> targetConfigSources.add(new OrdinalSource(it)));
ServiceLoader.load(ConfigSourceProvider.class)
.forEach(it -> it.getConfigSources(classLoader)
.forEach(source -> targetConfigSources.add(new OrdinalSource(source))));
ServiceLoader.load(MpConfigSourceProvider.class)
.forEach(it -> (profile == null ? it.getConfigSources(classLoader) : it.getConfigSources(classLoader, profile))
.forEach(source -> targetConfigSources.add(new OrdinalSource(source))));
}
private void addDiscoveredConverters(List targetConverters) {
ServiceLoader.load(Converter.class)
.forEach(it -> targetConverters.add(new OrdinalConverter(it)));
}
private void addDefaultSources(List targetConfigSources) {
if (useDefaultSources) {
// add default sources - system properties, environment variables and microprofile-config.properties
targetConfigSources.add(new OrdinalSource(MpConfigSources.systemProperties(), 400));
targetConfigSources.add(new OrdinalSource(MpConfigSources.environmentVariables(), 300));
// microprofile-config.properties
if (profile == null) {
MpConfigSources.classPath(classLoader, DEFAULT_CONFIG_SOURCE)
.stream()
.map(OrdinalSource::new)
.forEach(targetConfigSources::add);
} else {
MpConfigSources.classPath(classLoader, DEFAULT_CONFIG_SOURCE, profile)
.stream()
.map(OrdinalSource::new)
.forEach(targetConfigSources::add);
}
if (LOGGER.isLoggable(Level.TRACE)) {
LOGGER.log(Level.TRACE, "The following default config sources discovered: " + targetConfigSources);
}
}
}
private void addBuiltInConverters(List converters) {
// built-in converters - required by specification
addBuiltIn(converters, Boolean.class, ConfigMappers::toBoolean);
addBuiltIn(converters, Byte.class, Byte::parseByte);
addBuiltIn(converters, Short.class, Short::parseShort);
addBuiltIn(converters, Integer.class, Integer::parseInt);
addBuiltIn(converters, OptionalInt.class, MpConverters::toOptionalInt);
addBuiltIn(converters, Long.class, Long::parseLong);
addBuiltIn(converters, OptionalLong.class, MpConverters::toOptionalLong);
addBuiltIn(converters, Float.class, Float::parseFloat);
addBuiltIn(converters, Double.class, Double::parseDouble);
addBuiltIn(converters, OptionalDouble.class, MpConverters::toOptionalDouble);
addBuiltIn(converters, Character.class, MpConfigBuilder::toChar);
addBuiltIn(converters, Class.class, MpConfigBuilder::toClass);
// built-in converters - Helidon
//javax.math
addBuiltIn(converters, BigDecimal.class, ConfigMappers::toBigDecimal);
addBuiltIn(converters, BigInteger.class, ConfigMappers::toBigInteger);
//java.time
addBuiltIn(converters, Duration.class, ConfigMappers::toDuration);
addBuiltIn(converters, Period.class, ConfigMappers::toPeriod);
addBuiltIn(converters, LocalDate.class, ConfigMappers::toLocalDate);
addBuiltIn(converters, LocalDateTime.class, ConfigMappers::toLocalDateTime);
addBuiltIn(converters, LocalTime.class, ConfigMappers::toLocalTime);
addBuiltIn(converters, ZonedDateTime.class, ConfigMappers::toZonedDateTime);
addBuiltIn(converters, ZoneId.class, ConfigMappers::toZoneId);
addBuiltIn(converters, ZoneOffset.class, ConfigMappers::toZoneOffset);
addBuiltIn(converters, Instant.class, ConfigMappers::toInstant);
addBuiltIn(converters, OffsetTime.class, ConfigMappers::toOffsetTime);
addBuiltIn(converters, OffsetDateTime.class, ConfigMappers::toOffsetDateTime);
addBuiltIn(converters, YearMonth.class, YearMonth::parse);
//java.io
addBuiltIn(converters, File.class, MpConfigBuilder::toFile);
//java.nio
addBuiltIn(converters, Path.class, MpConfigBuilder::toPath);
addBuiltIn(converters, Charset.class, ConfigMappers::toCharset);
//java.net
addBuiltIn(converters, URI.class, ConfigMappers::toUri);
addBuiltIn(converters, URL.class, ConfigMappers::toUrl);
//java.util
addBuiltIn(converters, Pattern.class, ConfigMappers::toPattern);
addBuiltIn(converters, UUID.class, ConfigMappers::toUUID);
// obsolete stuff
// noinspection UseOfObsoleteDateTimeApi
addBuiltIn(converters, Date.class, ConfigMappers::toDate);
// noinspection UseOfObsoleteDateTimeApi
addBuiltIn(converters, Calendar.class, ConfigMappers::toCalendar);
// noinspection UseOfObsoleteDateTimeApi
addBuiltIn(converters, GregorianCalendar.class, ConfigMappers::toGregorianCalendar);
// noinspection UseOfObsoleteDateTimeApi
addBuiltIn(converters, TimeZone.class, ConfigMappers::toTimeZone);
// noinspection UseOfObsoleteDateTimeApi
addBuiltIn(converters, SimpleTimeZone.class, ConfigMappers::toSimpleTimeZone);
}
private void addBuiltIn(List converters, Class clazz, Converter converter) {
converters.add(new OrdinalConverter(converter, clazz, 1));
}
ConfigBuilder metaConfig(io.helidon.config.Config metaConfig) {
io.helidon.config.Config helidonConfig = io.helidon.config.Config.builder()
.config(metaConfig)
.build();
this.sources.add(new OrdinalSource(MpConfigSources.create(helidonConfig)));
return this;
}
private static class OrdinalSource {
private final int ordinal;
private final ConfigSource source;
private OrdinalSource(ConfigSource source) {
this.source = source;
this.ordinal = findOrdinal(source, ConfigSource.DEFAULT_ORDINAL);
}
private OrdinalSource(ConfigSource source, int ordinal) {
this.ordinal = findOrdinal(source, ordinal);
this.source = source;
}
private static int findOrdinal(ConfigSource source, int defaultOrdinal) {
int ordinal = source.getOrdinal();
if (ordinal == ConfigSource.DEFAULT_ORDINAL) {
return Priorities.find(source, defaultOrdinal);
}
return ordinal;
}
@Override
public String toString() {
return ordinal + " " + source.getName();
}
}
private static class OrdinalConverter {
private final int ordinal;
private final Class type;
private final Converter converter;
private OrdinalConverter(Converter converter, Class aClass, int ordinal) {
this.ordinal = ordinal;
this.type = aClass;
this.converter = new NullCheckingConverter<>(aClass, converter);
}
private OrdinalConverter(Converter converter) {
this(converter, getConverterType(converter.getClass()), Priorities.find(converter, 100));
}
@Override
public String toString() {
return type.getName() + "->" + converter;
}
}
private static final class NullCheckingConverter implements Converter {
private final Converter delegate;
private final Class type;
private NullCheckingConverter(Class type, Converter delegate) {
this.delegate = delegate;
this.type = type;
}
@Override
public T convert(String value) throws IllegalArgumentException, NullPointerException {
if (value == null) {
throw new NullPointerException("Null not allowed in MP converters. Converter for type " + type.getName());
}
try {
return delegate.convert(value);
} catch (IllegalArgumentException | NullPointerException e) {
throw e;
} catch (Exception e) {
throw new IllegalArgumentException("Cannot convert value", e);
}
}
@Override
public String toString() {
return type.getName() + "->" + delegate;
}
}
}
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