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Co-Authored-By: Prakhar Sapre <[email protected]>
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80 changes: 80 additions & 0 deletions
80
gateway-ha/src/main/java/io/trino/gateway/ha/router/MVELFileRoutingGroupSelector.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| /* | ||
| * 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.trino.gateway.ha.router; | ||
|
|
||
| import com.fasterxml.jackson.databind.ObjectMapper; | ||
| import com.fasterxml.jackson.dataformat.yaml.YAMLFactory; | ||
| import com.fasterxml.jackson.dataformat.yaml.YAMLParser; | ||
| import io.trino.gateway.ha.config.RequestAnalyzerConfig; | ||
|
|
||
| import java.io.IOException; | ||
| import java.nio.file.Files; | ||
| import java.nio.file.Path; | ||
| import java.nio.file.Paths; | ||
| import java.nio.file.attribute.BasicFileAttributes; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
|
|
||
| import static java.nio.charset.StandardCharsets.UTF_8; | ||
|
|
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| public class MVELFileRoutingGroupSelector | ||
| extends RulesRoutingGroupSelector<MVELRoutingRule> | ||
| { | ||
| Path rulesPath; | ||
|
|
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| MVELFileRoutingGroupSelector(String rulesPath, RequestAnalyzerConfig requestAnalyzerConfig) | ||
| { | ||
| super(requestAnalyzerConfig); | ||
| this.rulesPath = Paths.get(rulesPath); | ||
|
|
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| setRules(readRulesFromPath(this.rulesPath)); | ||
| } | ||
|
|
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| @Override | ||
| void reloadRules(long lastUpdatedTimeMillis) | ||
| { | ||
| try { | ||
| BasicFileAttributes attr = Files.readAttributes(this.rulesPath, BasicFileAttributes.class); | ||
| if (attr.lastModifiedTime().toMillis() > lastUpdatedTimeMillis) { | ||
| synchronized (this) { | ||
| if (attr.lastModifiedTime().toMillis() > lastUpdatedTimeMillis) { | ||
| List<MVELRoutingRule> ruleList = readRulesFromPath(this.rulesPath); | ||
| setRules(ruleList); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| catch (IOException e) { | ||
| throw new RuntimeException("Could not access rules file", e); | ||
| } | ||
| } | ||
|
|
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| public List<MVELRoutingRule> readRulesFromPath(Path rulesPath) | ||
| { | ||
| ObjectMapper yamlReader = new ObjectMapper(new YAMLFactory()); | ||
| try { | ||
| String content = Files.readString(rulesPath, UTF_8); | ||
| YAMLParser parser = new YAMLFactory().createParser(content); | ||
| List<MVELRoutingRule> routingRulesList = new ArrayList<>(); | ||
| while (parser.nextToken() != null) { | ||
| MVELRoutingRule routingRules = yamlReader.readValue(parser, MVELRoutingRule.class); | ||
| routingRulesList.add(routingRules); | ||
| } | ||
| return routingRulesList; | ||
| } | ||
| catch (IOException e) { | ||
| throw new RuntimeException("Failed to read or parse routing rules configuration from path : " + rulesPath, e); | ||
| } | ||
| } | ||
| } |
60 changes: 60 additions & 0 deletions
60
gateway-ha/src/main/java/io/trino/gateway/ha/router/MVELRoutingRule.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| /* | ||
| * 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.trino.gateway.ha.router; | ||
|
|
||
| import com.fasterxml.jackson.annotation.JsonCreator; | ||
| import com.fasterxml.jackson.annotation.JsonProperty; | ||
|
|
||
| import java.io.Serializable; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
|
|
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| import static com.google.common.collect.ImmutableList.toImmutableList; | ||
| import static org.mvel2.MVEL.compileExpression; | ||
| import static org.mvel2.MVEL.executeExpression; | ||
|
|
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| public class MVELRoutingRule | ||
| extends RoutingRule<Serializable> | ||
| { | ||
| @JsonCreator | ||
| public MVELRoutingRule( | ||
| @JsonProperty("name") String name, | ||
| @JsonProperty("description") String description, | ||
| @JsonProperty("priority") Integer priority, | ||
| @JsonProperty("condition") Serializable condition, | ||
| @JsonProperty("actions") List<Serializable> actions) | ||
| { | ||
| super( | ||
| name, | ||
| description, | ||
| priority, | ||
| condition instanceof String stringCondition ? compileExpression(stringCondition) : condition, | ||
| actions.stream().map(action -> { | ||
| if (action instanceof String stringAction) { | ||
| return compileExpression(stringAction); | ||
| } | ||
| else { | ||
| return action; | ||
| } | ||
| }).collect(toImmutableList())); | ||
| } | ||
|
|
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| @Override | ||
| public void evaluate(Map<String, Object> variables) | ||
| { | ||
| if ((boolean) executeExpression(condition, variables)) { | ||
| actions.forEach(action -> executeExpression(action, variables)); | ||
| } | ||
| } | ||
| } |
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59 changes: 59 additions & 0 deletions
59
gateway-ha/src/main/java/io/trino/gateway/ha/router/RoutingRule.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| /* | ||
| * 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.trino.gateway.ha.router; | ||
|
|
||
| import com.fasterxml.jackson.annotation.JsonCreator; | ||
| import com.fasterxml.jackson.annotation.JsonProperty; | ||
|
|
||
| import java.util.List; | ||
| import java.util.Map; | ||
|
|
||
| import static java.util.Objects.requireNonNull; | ||
| import static java.util.Objects.requireNonNullElse; | ||
|
|
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| public abstract class RoutingRule<T> | ||
| implements Comparable<RoutingRule<T>> | ||
| { | ||
| String name; | ||
| String description; | ||
| Integer priority; | ||
| T condition; | ||
| List<T> actions; | ||
|
|
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| @JsonCreator | ||
| public RoutingRule( | ||
| @JsonProperty("name") String name, | ||
| @JsonProperty("description") String description, | ||
| @JsonProperty("priority") Integer priority, | ||
| @JsonProperty("condition") T condition, | ||
| @JsonProperty("actions") List<T> actions) | ||
| { | ||
| this.name = requireNonNull(name, "name is null"); | ||
| this.description = requireNonNullElse(description, ""); | ||
| this.priority = requireNonNullElse(priority, 0); | ||
| this.condition = requireNonNull(condition, "condition is null"); | ||
| this.actions = requireNonNull(actions, "actions is null"); | ||
| } | ||
|
|
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| public abstract void evaluate(Map<String, Object> variables); | ||
|
|
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| @Override | ||
| public int compareTo(RoutingRule o) | ||
| { | ||
| if (o == null) { | ||
| return 1; | ||
| } | ||
| return priority.compareTo(o.priority); | ||
| } | ||
| } |
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