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36 package gr.grnet.aquarium.logic.accounting
38 import dsl.{Timeslot, DSLPolicy, DSL}
39 import gr.grnet.aquarium.Configurator._
40 import java.io.{InputStream, FileInputStream, File}
42 import com.ckkloverdos.maybe.{Maybe, Just}
43 import gr.grnet.aquarium.util.date.TimeHelpers
44 import gr.grnet.aquarium.logic.events.PolicyEntry
45 import gr.grnet.aquarium.util.{CryptoUtils, Loggable}
46 import java.util.concurrent.atomic.AtomicReference
49 * Searches for and loads the applicable accounting policy
51 * @author Georgios Gousios <gousiosg@gmail.com>
53 object Policy extends DSL with Loggable {
55 /* Pointer to the latest policy */
56 private lazy val policies = new AtomicReference[Map[Timeslot, DSLPolicy]](reloadPolicies)
58 /* Pointer to the latest policy */
59 private val currentPolicy = new AtomicReference[DSLPolicy](policies.get.last._2)
62 * Get the latest defined policy.
64 def policy = currentPolicy.get
67 * Get the policy that is valid at the specified time instance.
69 def policy(at: Date): Maybe[DSLPolicy] = Maybe {
71 a => (a._1.from.before(at) && a._1.to.after(at)) ||
72 (a._1.from.before(at) && a._1.to == -1)
76 throw new AccountingException("No valid policy for date: %s".format(at))
81 * Get the policies that are valid between the specified time instances
83 def policies(from: Date, to: Date): List[DSLPolicy] = {
85 a => a._1.from.before(from) &&
91 * Get the policies that are valid throughout the specified
92 * [[gr.grnet.aquarium.logic.accounting.dsl.Timeslot]]
94 def policies(t: Timeslot): List[DSLPolicy] = policies(t.from, t.to)
97 * Load and parse a policy from file.
99 def loadPolicyFromFile(pol: File): DSLPolicy = {
101 val stream = pol.exists() match {
103 logger.info("Using policy file %s".format(pol.getAbsolutePath))
104 new FileInputStream(pol)
106 logger.warn(("Cannot find user configured policy file %s, " +
107 "looking for default policy").format(pol.getAbsolutePath))
108 getClass.getClassLoader.getResourceAsStream("policy.yaml") match {
109 case x: InputStream =>
110 logger.warn("Using default policy, this is problably not what you want")
113 logger.error("No valid policy file found, Aquarium will fail")
121 * Trigger a policy update cycle.
123 def updatePolicies = synchronized {
124 //XXX: The following update should happen as one transaction
125 val tmpPol = reloadPolicies
126 currentPolicy.set(tmpPol.last._2)
131 * Search for and open a stream to a policy.
133 private def policyFile: File =
134 MasterConfigurator.props.get(Keys.aquarium_policy) match {
135 case Just(x) => new File(x)
136 case _ => new File("/etc/aquarium/policy.yaml")
140 * Check whether the policy definition file (in whichever path) is
141 * newer than the latest stored policy, reload and set it as current.
142 * This method has side-effects to this object's state.
144 private def reloadPolicies: Map[Timeslot, DSLPolicy] = {
145 //1. Load policies from db
146 val policies = MasterConfigurator.policyEventStore.loadPolicies(0)
148 //2. Check whether policy file has been updated
149 val latestPolicyChange = if (policies.isEmpty) 0 else policies.last.validFrom
150 val policyf = policyFile
153 if (policyf.exists) {
154 if (policyf.lastModified > latestPolicyChange) {
155 logger.info("Policy changed since last check, reloading")
158 logger.info("Policy not changed since last check")
161 logger.warn("User specified policy file %s does not exist, " +
162 "using stored policy information".format(policyf.getAbsolutePath))
165 val toAdd = updated match {
167 val ts = TimeHelpers.nowMillis
168 val toUpdate = policies.last.copy(validTo = ts)
169 val parsedNew = loadPolicyFromFile(policyf)
170 val yaml = parsedNew.toYAML
171 val newPolicy = PolicyEntry(CryptoUtils.sha1(yaml), ts, ts, yaml, ts + 1, -1)
173 MasterConfigurator.policyEventStore.updatePolicy(toUpdate)
174 MasterConfigurator.policyEventStore.storePolicy(newPolicy)
176 List(toUpdate, newPolicy)
180 policies.init.++(toAdd).foldLeft(Map[Timeslot, DSLPolicy]()){
182 acc ++ Map(Timeslot(new Date(p.validFrom), new Date(p.validTo)) -> parse(p.policyYAML))