Thomas Vachuska | 11b99fc | 2017-04-27 12:51:04 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2017-present Open Networking Laboratory |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.onosproject.net.driver.impl; |
| 17 | |
| 18 | import com.google.common.collect.ImmutableSet; |
| 19 | import com.google.common.collect.Maps; |
| 20 | import com.google.common.collect.Sets; |
| 21 | import org.apache.felix.scr.annotations.Activate; |
| 22 | import org.apache.felix.scr.annotations.Component; |
| 23 | import org.apache.felix.scr.annotations.Deactivate; |
| 24 | import org.apache.felix.scr.annotations.Modified; |
| 25 | import org.apache.felix.scr.annotations.Property; |
| 26 | import org.apache.felix.scr.annotations.Reference; |
| 27 | import org.apache.felix.scr.annotations.ReferenceCardinality; |
| 28 | import org.apache.felix.scr.annotations.Service; |
| 29 | import org.onosproject.cfg.ComponentConfigService; |
| 30 | import org.onosproject.incubator.component.ComponentService; |
| 31 | import org.onosproject.net.device.DeviceService; |
| 32 | import org.onosproject.net.driver.Behaviour; |
| 33 | import org.onosproject.net.driver.DefaultDriverProvider; |
| 34 | import org.onosproject.net.driver.Driver; |
| 35 | import org.onosproject.net.driver.DriverAdminService; |
| 36 | import org.onosproject.net.driver.DriverProvider; |
| 37 | import org.osgi.service.component.ComponentContext; |
| 38 | import org.slf4j.Logger; |
| 39 | import org.slf4j.LoggerFactory; |
| 40 | |
| 41 | import java.util.Dictionary; |
| 42 | import java.util.Map; |
| 43 | import java.util.Optional; |
| 44 | import java.util.Properties; |
| 45 | import java.util.Set; |
| 46 | |
| 47 | import static com.google.common.base.Strings.isNullOrEmpty; |
| 48 | import static org.onlab.util.Tools.get; |
| 49 | import static org.onlab.util.Tools.nullIsNotFound; |
| 50 | import static org.onosproject.security.AppGuard.checkPermission; |
| 51 | import static org.onosproject.security.AppPermission.Type.DRIVER_READ; |
| 52 | |
| 53 | |
| 54 | /** |
| 55 | * Manages inventory of device drivers. |
| 56 | */ |
| 57 | @Service |
| 58 | @Component(immediate = true, enabled = true) |
| 59 | public class DriverRegistryManager extends DefaultDriverProvider implements DriverAdminService { |
| 60 | |
| 61 | private static final String DRIVER_COMPONENT = "org.onosproject.net.driver.impl.DriverManager"; |
| 62 | |
| 63 | private final Logger log = LoggerFactory.getLogger(getClass()); |
| 64 | |
| 65 | private static final String FORMAT = "Required drivers: {}"; |
| 66 | private static final String COMMA = ","; |
| 67 | private static final String NO_DRIVER = "Driver not found"; |
| 68 | private static final String DEFAULT = "default"; |
| 69 | |
| 70 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 71 | protected DeviceService deviceService; |
| 72 | |
| 73 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 74 | protected ComponentConfigService componentConfigService; |
| 75 | |
| 76 | @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| 77 | protected ComponentService componenService; |
| 78 | |
| 79 | |
| 80 | private static final String DEFAULT_REQUIRED_DRIVERS = "default"; |
| 81 | @Property(name = "requiredDrivers", value = DEFAULT_REQUIRED_DRIVERS, |
| 82 | label = "Comma-separated list of drivers that must be registered before starting driver subsystem") |
| 83 | private String requiredDrivers = DEFAULT_REQUIRED_DRIVERS; |
| 84 | private Set<String> requiredDriverSet; |
| 85 | |
| 86 | private Set<DriverProvider> providers = Sets.newConcurrentHashSet(); |
| 87 | private Map<String, Driver> driverByKey = Maps.newConcurrentMap(); |
| 88 | private Map<String, Class<? extends Behaviour>> classes = Maps.newConcurrentMap(); |
| 89 | |
| 90 | private boolean isStarted = false; |
| 91 | |
| 92 | @Activate |
| 93 | protected void activate(ComponentContext context) { |
| 94 | componentConfigService.registerProperties(getClass()); |
| 95 | modified(context); |
| 96 | log.info("Started"); |
| 97 | } |
| 98 | |
| 99 | @Deactivate |
| 100 | protected void deactivate() { |
| 101 | componentConfigService.unregisterProperties(getClass(), false); |
| 102 | providers.clear(); |
| 103 | driverByKey.clear(); |
| 104 | classes.clear(); |
| 105 | log.info("Stopped"); |
| 106 | } |
| 107 | |
| 108 | @Modified |
| 109 | public void modified(ComponentContext context) { |
| 110 | Dictionary<?, ?> properties = context != null ? context.getProperties() : new Properties(); |
| 111 | if (context != null) { |
| 112 | requiredDrivers = get(properties, "requiredDrivers"); |
| 113 | } |
| 114 | requiredDriverSet = isNullOrEmpty(requiredDrivers) ? |
| 115 | ImmutableSet.of() : ImmutableSet.copyOf(requiredDrivers.split(COMMA)); |
| 116 | log.info(FORMAT, requiredDrivers); |
| 117 | checkRequiredDrivers(); |
| 118 | } |
| 119 | |
| 120 | @Override |
| 121 | public Set<DriverProvider> getProviders() { |
| 122 | return ImmutableSet.copyOf(providers); |
| 123 | } |
| 124 | |
| 125 | @Override |
| 126 | public void registerProvider(DriverProvider provider) { |
| 127 | provider.getDrivers().forEach(driver -> { |
| 128 | Driver d = addDriver(driver); |
| 129 | driverByKey.put(key(driver.manufacturer(), |
| 130 | driver.hwVersion(), |
| 131 | driver.swVersion()), d); |
| 132 | d.behaviours().forEach(b -> { |
| 133 | Class<? extends Behaviour> implementation = d.implementation(b); |
| 134 | classes.put(b.getName(), b); |
| 135 | classes.put(implementation.getName(), implementation); |
| 136 | }); |
| 137 | }); |
| 138 | providers.add(provider); |
| 139 | checkRequiredDrivers(); |
| 140 | } |
| 141 | |
| 142 | @Override |
| 143 | public void unregisterProvider(DriverProvider provider) { |
| 144 | provider.getDrivers().forEach(driver -> { |
| 145 | removeDriver(driver); |
| 146 | driverByKey.remove(key(driver.manufacturer(), |
| 147 | driver.hwVersion(), |
| 148 | driver.swVersion())); |
| 149 | }); |
| 150 | providers.remove(provider); |
| 151 | checkRequiredDrivers(); |
| 152 | } |
| 153 | |
| 154 | // Checks for the minimum required drivers and when available, activate |
| 155 | // the driver manager components; deactivate otherwise. |
| 156 | private synchronized void checkRequiredDrivers() { |
| 157 | Set<String> driverSet = registeredDrivers(); |
| 158 | boolean isReady = driverSet.containsAll(requiredDriverSet); |
| 159 | if (isReady && !isStarted) { |
| 160 | log.info("Starting driver subsystem"); |
| 161 | componenService.activate(null, DRIVER_COMPONENT); |
| 162 | isStarted = true; |
| 163 | } else if (!isReady && isStarted) { |
| 164 | log.info("Stopping driver subsystem"); |
| 165 | componenService.deactivate(null, DRIVER_COMPONENT); |
| 166 | isStarted = false; |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | private Set<String> registeredDrivers() { |
| 171 | ImmutableSet.Builder<String> builder = ImmutableSet.builder(); |
| 172 | for (DriverProvider dp : providers) { |
| 173 | dp.getDrivers().stream().map(Driver::name).forEach(builder::add); |
| 174 | } |
| 175 | return builder.build(); |
| 176 | } |
| 177 | |
| 178 | @Override |
| 179 | public Class<? extends Behaviour> getBehaviourClass(String className) { |
| 180 | return classes.get(className); |
| 181 | } |
| 182 | |
| 183 | @Override |
| 184 | public Set<Driver> getDrivers() { |
| 185 | checkPermission(DRIVER_READ); |
| 186 | ImmutableSet.Builder<Driver> builder = ImmutableSet.builder(); |
| 187 | drivers.values().forEach(builder::add); |
| 188 | return builder.build(); |
| 189 | } |
| 190 | |
| 191 | @Override |
| 192 | public Driver getDriver(String mfr, String hw, String sw) { |
| 193 | checkPermission(DRIVER_READ); |
| 194 | |
| 195 | // First attempt a literal search. |
| 196 | Driver driver = driverByKey.get(key(mfr, hw, sw)); |
| 197 | if (driver != null) { |
| 198 | return driver; |
| 199 | } |
| 200 | |
| 201 | // Otherwise, sweep through the key space and attempt to match using |
| 202 | // regular expression matching. |
| 203 | Optional<Driver> optional = driverByKey.values().stream() |
| 204 | .filter(d -> matches(d, mfr, hw, sw)).findFirst(); |
| 205 | |
| 206 | // If no matching driver is found, return default. |
| 207 | return optional.orElse(drivers.get(DEFAULT)); |
| 208 | } |
| 209 | |
| 210 | @Override |
| 211 | public Driver getDriver(String driverName) { |
| 212 | checkPermission(DRIVER_READ); |
| 213 | return nullIsNotFound(drivers.get(driverName), NO_DRIVER); |
| 214 | } |
| 215 | |
| 216 | // Matches the given driver using ERE matching against the given criteria. |
| 217 | private boolean matches(Driver d, String mfr, String hw, String sw) { |
| 218 | // TODO: consider pre-compiling the expressions in the future |
| 219 | return mfr.matches(d.manufacturer()) && |
| 220 | hw.matches(d.hwVersion()) && |
| 221 | sw.matches(d.swVersion()); |
| 222 | } |
| 223 | |
| 224 | // Produces a composite driver key using the specified components. |
| 225 | static String key(String mfr, String hw, String sw) { |
| 226 | return String.format("%s-%s-%s", mfr, hw, sw); |
| 227 | } |
| 228 | } |