new ruleNode 'json path'

pom.xml

@@ -1213,7 +1213,6 @@
                 <groupId>com.jayway.jsonpath</groupId>
                 <artifactId>json-path</artifactId>
                 <version>${json-path.version}</version>
-                <scope>test</scope>
             </dependency>
             <dependency>
                 <groupId>com.jayway.jsonpath</groupId>

rule-engine/rule-engine-components/pom.xml

@@ -160,6 +160,10 @@
             </exclusions>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>com.jayway.jsonpath</groupId>
+            <artifactId>json-path</artifactId>
+        </dependency>
     </dependencies>
 
     <build>

rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/transform/TbJsonPathNode.java

@@ -0,0 +1,83 @@
+/**
+ * Copyright © 2016-2022 The Thingsboard Authors
+ *
+ * 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 org.thingsboard.rule.engine.transform;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.jayway.jsonpath.Configuration;
+import com.jayway.jsonpath.JsonPath;
+import com.jayway.jsonpath.PathNotFoundException;
+import com.jayway.jsonpath.spi.json.JacksonJsonNodeJsonProvider;
+import lombok.extern.slf4j.Slf4j;
+import org.thingsboard.common.util.JacksonUtil;
+import org.thingsboard.rule.engine.api.RuleNode;
+import org.thingsboard.rule.engine.api.TbContext;
+import org.thingsboard.rule.engine.api.TbNode;
+import org.thingsboard.rule.engine.api.TbNodeConfiguration;
+import org.thingsboard.rule.engine.api.TbNodeException;
+import org.thingsboard.rule.engine.api.util.TbNodeUtils;
+import org.thingsboard.server.common.data.StringUtils;
+import org.thingsboard.server.common.data.plugin.ComponentType;
+import org.thingsboard.server.common.msg.TbMsg;
+
+import java.util.concurrent.ExecutionException;
+
+@Slf4j
+@RuleNode(
+        type = ComponentType.TRANSFORMATION,
+        name = "json path",
+        configClazz = TbJsonPathNodeConfiguration.class,
+        nodeDescription = "JSONPath expression from message",
+        nodeDetails = "",
+        icon = "functions",
+        configDirective = "tbTransformationNodeJsonPathConfig"
+)
+public class TbJsonPathNode implements TbNode {
+
+    TbJsonPathNodeConfiguration config;
+    Configuration configurationJsonPath;
+    JsonPath jsonPath;
+
+    @Override
+    public void init(TbContext ctx, TbNodeConfiguration configuration) throws TbNodeException {
+        this.config = TbNodeUtils.convert(configuration, TbJsonPathNodeConfiguration.class);
+        this.configurationJsonPath = Configuration.builder()
+                .jsonProvider(new JacksonJsonNodeJsonProvider())
+                .build();
+        if (StringUtils.isEmpty(config.getJsonPath())) {
+            throw new IllegalArgumentException("JsonPath expression is not specified");
+        }
+        this.jsonPath = JsonPath.compile(config.getJsonPath());
+    }
+
+    @Override
+    public void onMsg(TbContext ctx, TbMsg msg) throws ExecutionException, InterruptedException, TbNodeException {
+        try {
+            JsonNode jsonPathData = jsonPath.read(msg.getData(), this.configurationJsonPath);
+            ctx.tellSuccess(createNewMsg(msg, jsonPathData));
+        } catch (PathNotFoundException e) {
+            ctx.tellFailure(msg, e);
+        }
+    }
+
+    private TbMsg createNewMsg(TbMsg msg, JsonNode msgNode) {
+        return TbMsg.newMsg(msg.getQueueName(), msg.getType(), msg.getOriginator(), msg.getMetaData(), JacksonUtil.toString(msgNode));
+    }
+
+    @Override
+    public void destroy() {
+
+    }
+}

rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/transform/TbJsonPathNodeConfiguration.java

@@ -0,0 +1,33 @@
+/**
+ * Copyright © 2016-2022 The Thingsboard Authors
+ *
+ * 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 org.thingsboard.rule.engine.transform;
+
+import lombok.Data;
+import org.thingsboard.rule.engine.api.NodeConfiguration;
+
+@Data
+public class TbJsonPathNodeConfiguration implements NodeConfiguration<TbJsonPathNodeConfiguration> {
+
+    private String jsonPath;
+
+    @Override
+    public TbJsonPathNodeConfiguration defaultConfiguration() {
+        TbJsonPathNodeConfiguration configuration = new TbJsonPathNodeConfiguration();
+        configuration.setJsonPath("$");
+        return configuration;
+    }
+
+}

rule-engine/rule-engine-components/src/test/java/org/thingsboard/rule/engine/transform/TbJsonPathNodeTest.java

@@ -0,0 +1,172 @@
+/**
+ * Copyright © 2016-2022 The Thingsboard Authors
+ *
+ * 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 org.thingsboard.rule.engine.transform;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.jayway.jsonpath.PathNotFoundException;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.ArgumentCaptor;
+import org.thingsboard.common.util.JacksonUtil;
+import org.thingsboard.rule.engine.api.TbContext;
+import org.thingsboard.rule.engine.api.TbNodeConfiguration;
+import org.thingsboard.rule.engine.api.TbNodeException;
+import org.thingsboard.server.common.data.id.DeviceId;
+import org.thingsboard.server.common.data.id.EntityId;
+import org.thingsboard.server.common.msg.TbMsg;
+import org.thingsboard.server.common.msg.TbMsgMetaData;
+import org.thingsboard.server.common.msg.queue.TbMsgCallback;
+
+import java.util.Map;
+import java.util.UUID;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+public class TbJsonPathNodeTest {
+    final ObjectMapper mapper = new ObjectMapper();
+
+    DeviceId deviceId;
+    TbJsonPathNode node;
+    TbJsonPathNodeConfiguration config;
+    TbNodeConfiguration nodeConfiguration;
+    TbContext ctx;
+    TbMsgCallback callback;
+
+    @BeforeEach
+    void setUp() throws TbNodeException {
+        deviceId = new DeviceId(UUID.randomUUID());
+        callback = mock(TbMsgCallback.class);
+        ctx = mock(TbContext.class);
+        config = new TbJsonPathNodeConfiguration();
+        config.setJsonPath("$.Attribute_2");
+        nodeConfiguration = new TbNodeConfiguration(mapper.valueToTree(config));
+        node = spy(new TbJsonPathNode());
+        node.init(ctx, nodeConfiguration);
+    }
+
+    @AfterEach
+    void tearDown() {
+        node.destroy();
+    }
+
+    @Test
+    void givenDefaultConfig_whenInit_thenOK() {
+        assertThat(node.config).isEqualTo(config);
+    }
+
+    @Test
+    void givenDefaultConfig_whenInit_thenFail() {
+        config.setJsonPath("");
+        nodeConfiguration = new TbNodeConfiguration(mapper.valueToTree(config));
+        assertThatThrownBy(() -> node.init(ctx, nodeConfiguration)).isInstanceOf(IllegalArgumentException.class);
+    }
+
+    @Test
+    void givenDefaultConfig_whenVerify_thenOK() {
+        TbJsonPathNodeConfiguration defaultConfig = new TbJsonPathNodeConfiguration().defaultConfiguration();
+        assertThat(defaultConfig.getJsonPath()).isEqualTo("$");
+    }
+
+    @Test
+    void givenPrimitiveMsg_whenOnMsg_thenVerifyOutput() throws Exception {
+        String data = "{\"Attribute_1\":22.5,\"Attribute_2\":100}";
+        VerifyOutputMsg(data, 1, 100);
+
+        data = "{\"Attribute_1\":22.5,\"Attribute_2\":\"StringValue\"}";
+        VerifyOutputMsg(data, 2, "StringValue");
+    }
+
+    @Test
+    void givenJsonArray_whenOnMsg_thenVerifyOutput() throws Exception {
+        String data = "{\"Attribute_1\":22.5,\"Attribute_2\":[{\"Attribute_3\":22.5,\"Attribute_4\":10.3}, {\"Attribute_5\":22.5,\"Attribute_6\":10.3}]}";
+        VerifyOutputMsg(data, 1, JacksonUtil.toJsonNode(data).get("Attribute_2"));
+    }
+
+    @Test
+    void givenJsonNode_whenOnMsg_thenVerifyOutput() throws Exception {
+        String data = "{\"Attribute_1\":22.5,\"Attribute_2\":{\"Attribute_3\":22.5,\"Attribute_4\":10.3}}";
+        VerifyOutputMsg(data, 1, JacksonUtil.toJsonNode(data).get("Attribute_2"));
+    }
+
+    @Test
+    void givenJsonArrayWithFilter_whenOnMsg_thenVerifyOutput() throws Exception {
+        config.setJsonPath("$.Attribute_2[?(@.voltage > 200)]");
+        nodeConfiguration = new TbNodeConfiguration(mapper.valueToTree(config));
+        node.init(ctx, nodeConfiguration);
+
+        String data = "{\"Attribute_1\":22.5,\"Attribute_2\":[{\"voltage\":220}, {\"voltage\":250}, {\"voltage\":110}]}";
+        VerifyOutputMsg(data, 1, JacksonUtil.toJsonNode("[{\"voltage\":220}, {\"voltage\":250}]"));
+    }
+
+    @Test
+    void givenNoArrayMsg_whenOnMsg_thenTellFailure() throws Exception {
+        String data = "{\"Attribute_1\":22.5,\"Attribute_5\":10.3}";
+        JsonNode dataNode = JacksonUtil.toJsonNode(data);
+        TbMsg msg = getTbMsg(deviceId, dataNode.toString());
+        node.onMsg(ctx, msg);
+
+        ArgumentCaptor<TbMsg> newMsgCaptor = ArgumentCaptor.forClass(TbMsg.class);
+        ArgumentCaptor<Exception> exceptionCaptor = ArgumentCaptor.forClass(Exception.class);
+        verify(ctx, never()).tellSuccess(any());
+        verify(ctx, times(1)).tellFailure(newMsgCaptor.capture(), exceptionCaptor.capture());
+
+        assertThat(newMsgCaptor.getValue()).isSameAs(msg);
+        assertThat(exceptionCaptor.getValue()).isInstanceOf(RuntimeException.class);
+    }
+
+    @Test
+    void givenNoResultsForPath_whenOnMsg_thenTellFailure() throws Exception {
+        String data = "{\"Attribute_1\":22.5,\"Attribute_5\":10.3}";
+        JsonNode dataNode = JacksonUtil.toJsonNode(data);
+        TbMsg msg = getTbMsg(deviceId, dataNode.toString());
+        node.onMsg(ctx, msg);
+
+        ArgumentCaptor<TbMsg> newMsgCaptor = ArgumentCaptor.forClass(TbMsg.class);
+        ArgumentCaptor<Exception> exceptionCaptor = ArgumentCaptor.forClass(Exception.class);
+        verify(ctx, never()).tellSuccess(any());
+        verify(ctx, times(1)).tellFailure(newMsgCaptor.capture(), exceptionCaptor.capture());
+
+        assertThat(newMsgCaptor.getValue()).isSameAs(msg);
+        assertThat(exceptionCaptor.getValue()).isInstanceOf(PathNotFoundException.class);
+    }
+
+    private void VerifyOutputMsg(String data, int countTellSuccess, Object value) throws Exception {
+        JsonNode dataNode = JacksonUtil.toJsonNode(data);
+        node.onMsg(ctx, getTbMsg(deviceId, dataNode.toString()));
+
+        ArgumentCaptor<TbMsg> newMsgCaptor = ArgumentCaptor.forClass(TbMsg.class);
+        verify(ctx, times(countTellSuccess)).tellSuccess(newMsgCaptor.capture());
+        verify(ctx, never()).tellFailure(any(), any());
+
+        assertThat(newMsgCaptor.getValue().getData()).isEqualTo(JacksonUtil.toString(value));
+    }
+
+    private TbMsg getTbMsg(EntityId entityId, String data) {
+        Map<String, String> mdMap = Map.of("country", "US",
+                "city", "NY"
+        );
+        return TbMsg.newMsg("POST_ATTRIBUTES_REQUEST", entityId, new TbMsgMetaData(mdMap), data, callback);
+    }
+}