Add tutorial for type description service by minggangw · Pull Request #1268 · RobotWebTools/rclnodejs

minggangw · 2025-09-19T03:19:46Z

This PR adds a comprehensive tutorial for the Type Description Service feature in rclnodejs. The tutorial provides detailed documentation on how to use the built-in ROS 2 introspection service that allows querying message and service type information from running nodes.

Key changes:

Complete tutorial covering Type Description Service functionality, requirements, and usage patterns
Multiple practical examples demonstrating basic usage, advanced features, and best practices
Comprehensive troubleshooting guide and performance considerations

Fix: #1267

Copilot

Pull Request Overview

This PR adds a comprehensive tutorial for the Type Description Service feature in rclnodejs. The tutorial provides detailed documentation on how to use the built-in ROS 2 introspection service that allows querying message and service type information from running nodes.

Key changes:

Complete tutorial covering Type Description Service functionality, requirements, and usage patterns
Multiple practical examples demonstrating basic usage, advanced features, and best practices
Comprehensive troubleshooting guide and performance considerations

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

Copilot · 2025-09-19T03:22:30Z

+  }
+
+  async discoverNodeTypes(nodeName) {
+    console.log(`\\nDiscovering types for node: ${nodeName}`);


The escaped newline character should be a literal newline. Replace \\n with \n.

Suggested change

console.log(`\\nDiscovering types for node: ${nodeName}`);

console.log(`\nDiscovering types for node: ${nodeName}`);

Copilot · 2025-09-19T03:22:31Z

+  processTypeDescription(typeName, response) {
+    const typeDesc = response.type_description.type_description;
+
+    console.log(`\\n=== Type: ${typeName} ===`);


The escaped newline character should be a literal newline. Replace \\n with \n.

Suggested change

console.log(`\\n=== Type: ${typeName} ===`);

console.log(`\n=== Type: ${typeName} ===`);

Copilot · 2025-09-19T03:22:31Z

+  }
+
+  printSummary() {
+    console.log(`\\n=== Discovery Summary ===`);


The escaped newline character should be a literal newline. Replace \\n with \n.

Suggested change

console.log(`\\n=== Discovery Summary ===`);

console.log(`\n=== Discovery Summary ===`);

Copilot · 2025-09-19T03:22:31Z

+    let markdown = `# Type Documentation for Node: ${nodeName}\\n\\n`;
+    markdown += `Generated on: ${new Date().toISOString()}\\n\\n`;
+
+    this.documentation.forEach((doc) => {
+      markdown += `## ${doc.typeName}\\n\\n`;
+      markdown += `**Topic**: \`${doc.topicName}\`\\n\\n`;
+
+      if (doc.description.fields.length > 0) {
+        markdown += `### Fields\\n\\n`;
+        markdown += `| Field Name | Type | Default Value |\\n`;
+        markdown += `|------------|------|---------------|\\n`;
+
+        doc.description.fields.forEach((field) => {
+          const typeStr = this.formatFieldTypeForDoc(field.type);
+          markdown += `| \`${field.name}\` | ${typeStr} | \`${field.default_value || 'N/A'}\` |\\n`;
+        });
+        markdown += `\\n`;
+      }
+
+      if (doc.sources.length > 0) {
+        markdown += `### Source Definition\\n\\n`;
+        markdown += `\`\`\`${doc.sources[0].encoding}\\n`;
+        markdown += doc.sources[0].raw_file_contents;
+        markdown += `\`\`\`\\n\\n`;
+      }
+
+      markdown += `---\\n\\n`;


The escaped newline characters should be literal newlines. Replace \\n with \n.

Suggested change

let markdown = `# Type Documentation for Node: ${nodeName}\\n\\n`;

markdown += `Generated on: ${new Date().toISOString()}\\n\\n`;

this.documentation.forEach((doc) => {

markdown += `## ${doc.typeName}\\n\\n`;

markdown += `**Topic**: \`${doc.topicName}\`\\n\\n`;

if (doc.description.fields.length > 0) {

markdown += `### Fields\\n\\n`;

markdown += `| Field Name | Type | Default Value |\\n`;

markdown += `|------------|------|---------------|\\n`;

doc.description.fields.forEach((field) => {

const typeStr = this.formatFieldTypeForDoc(field.type);

markdown += `| \`${field.name}\` | ${typeStr} | \`${field.default_value || 'N/A'}\` |\\n`;

});

markdown += `\\n`;

}

if (doc.sources.length > 0) {

markdown += `### Source Definition\\n\\n`;

markdown += `\`\`\`${doc.sources[0].encoding}\\n`;

markdown += doc.sources[0].raw_file_contents;

markdown += `\`\`\`\\n\\n`;

}

markdown += `---\\n\\n`;

let markdown = `# Type Documentation for Node: ${nodeName}\n\n`;

markdown += `Generated on: ${new Date().toISOString()}\n\n`;

this.documentation.forEach((doc) => {

markdown += `## ${doc.typeName}\n\n`;

markdown += `**Topic**: \`${doc.topicName}\`\n\n`;

if (doc.description.fields.length > 0) {

markdown += `### Fields\n\n`;

markdown += `| Field Name | Type | Default Value |\n`;

markdown += `|------------|------|---------------|\n`;

doc.description.fields.forEach((field) => {

const typeStr = this.formatFieldTypeForDoc(field.type);

markdown += `| \`${field.name}\` | ${typeStr} | \`${field.default_value || 'N/A'}\` |\n`;

});

markdown += `\n`;

}

if (doc.sources.length > 0) {

markdown += `### Source Definition\n\n`;

markdown += `\`\`\`${doc.sources[0].encoding}\n`;

markdown += doc.sources[0].raw_file_contents;

markdown += `\`\`\`\n\n`;

}

markdown += `---\n\n`;

Copilot · 2025-09-19T03:22:31Z

+    let markdown = `# Type Documentation for Node: ${nodeName}\\n\\n`;
+    markdown += `Generated on: ${new Date().toISOString()}\\n\\n`;
+
+    this.documentation.forEach((doc) => {
+      markdown += `## ${doc.typeName}\\n\\n`;
+      markdown += `**Topic**: \`${doc.topicName}\`\\n\\n`;
+
+      if (doc.description.fields.length > 0) {
+        markdown += `### Fields\\n\\n`;
+        markdown += `| Field Name | Type | Default Value |\\n`;
+        markdown += `|------------|------|---------------|\\n`;
+
+        doc.description.fields.forEach((field) => {
+          const typeStr = this.formatFieldTypeForDoc(field.type);
+          markdown += `| \`${field.name}\` | ${typeStr} | \`${field.default_value || 'N/A'}\` |\\n`;
+        });
+        markdown += `\\n`;
+      }
+
+      if (doc.sources.length > 0) {
+        markdown += `### Source Definition\\n\\n`;
+        markdown += `\`\`\`${doc.sources[0].encoding}\\n`;
+        markdown += doc.sources[0].raw_file_contents;
+        markdown += `\`\`\`\\n\\n`;
+      }
+
+      markdown += `---\\n\\n`;


The escaped newline characters should be literal newlines. Replace \\n with \n.

Suggested change

let markdown = `# Type Documentation for Node: ${nodeName}\\n\\n`;

markdown += `Generated on: ${new Date().toISOString()}\\n\\n`;

this.documentation.forEach((doc) => {

markdown += `## ${doc.typeName}\\n\\n`;

markdown += `**Topic**: \`${doc.topicName}\`\\n\\n`;

if (doc.description.fields.length > 0) {

markdown += `### Fields\\n\\n`;

markdown += `| Field Name | Type | Default Value |\\n`;

markdown += `|------------|------|---------------|\\n`;

doc.description.fields.forEach((field) => {

const typeStr = this.formatFieldTypeForDoc(field.type);

markdown += `| \`${field.name}\` | ${typeStr} | \`${field.default_value || 'N/A'}\` |\\n`;

});

markdown += `\\n`;

}

if (doc.sources.length > 0) {

markdown += `### Source Definition\\n\\n`;

markdown += `\`\`\`${doc.sources[0].encoding}\\n`;

markdown += doc.sources[0].raw_file_contents;

markdown += `\`\`\`\\n\\n`;

}

markdown += `---\\n\\n`;

let markdown = `# Type Documentation for Node: ${nodeName}\n\n`;

markdown += `Generated on: ${new Date().toISOString()}\n\n`;

this.documentation.forEach((doc) => {

markdown += `## ${doc.typeName}\n\n`;

markdown += `**Topic**: \`${doc.topicName}\`\n\n`;

if (doc.description.fields.length > 0) {

markdown += `### Fields\n\n`;

markdown += `| Field Name | Type | Default Value |\n`;

markdown += `|------------|------|---------------|\n`;

doc.description.fields.forEach((field) => {

const typeStr = this.formatFieldTypeForDoc(field.type);

markdown += `| \`${field.name}\` | ${typeStr} | \`${field.default_value || 'N/A'}\` |\n`;

});

markdown += `\n`;

}

if (doc.sources.length > 0) {

markdown += `### Source Definition\n\n`;

markdown += `\`\`\`${doc.sources[0].encoding}\n`;

markdown += doc.sources[0].raw_file_contents;

markdown += `\`\`\`\n\n`;

}

markdown += `---\n\n`;

Copilot · 2025-09-19T03:22:33Z

+        markdown += `### Source Definition\\n\\n`;
+        markdown += `\`\`\`${doc.sources[0].encoding}\\n`;
+        markdown += doc.sources[0].raw_file_contents;
+        markdown += `\`\`\`\\n\\n`;


The escaped newline characters should be literal newlines. Replace \\n with \n.

Suggested change

markdown += `\`\`\`\\n\\n`;

markdown += `\`\`\`\n\n`;

Copilot · 2025-09-19T03:22:33Z

+    let markdown = `# Type Documentation for Node: ${nodeName}\\n\\n`;
+    markdown += `Generated on: ${new Date().toISOString()}\\n\\n`;
+
+    this.documentation.forEach((doc) => {
+      markdown += `## ${doc.typeName}\\n\\n`;
+      markdown += `**Topic**: \`${doc.topicName}\`\\n\\n`;
+
+      if (doc.description.fields.length > 0) {
+        markdown += `### Fields\\n\\n`;
+        markdown += `| Field Name | Type | Default Value |\\n`;
+        markdown += `|------------|------|---------------|\\n`;
+
+        doc.description.fields.forEach((field) => {
+          const typeStr = this.formatFieldTypeForDoc(field.type);
+          markdown += `| \`${field.name}\` | ${typeStr} | \`${field.default_value || 'N/A'}\` |\\n`;
+        });
+        markdown += `\\n`;
+      }
+
+      if (doc.sources.length > 0) {
+        markdown += `### Source Definition\\n\\n`;
+        markdown += `\`\`\`${doc.sources[0].encoding}\\n`;
+        markdown += doc.sources[0].raw_file_contents;
+        markdown += `\`\`\`\\n\\n`;
+      }
+
+      markdown += `---\\n\\n`;


The escaped newline characters should be literal newlines. Replace \\n with \n.

Suggested change

let markdown = `# Type Documentation for Node: ${nodeName}\\n\\n`;

markdown += `Generated on: ${new Date().toISOString()}\\n\\n`;

this.documentation.forEach((doc) => {

markdown += `## ${doc.typeName}\\n\\n`;

markdown += `**Topic**: \`${doc.topicName}\`\\n\\n`;

if (doc.description.fields.length > 0) {

markdown += `### Fields\\n\\n`;

markdown += `| Field Name | Type | Default Value |\\n`;

markdown += `|------------|------|---------------|\\n`;

doc.description.fields.forEach((field) => {

const typeStr = this.formatFieldTypeForDoc(field.type);

markdown += `| \`${field.name}\` | ${typeStr} | \`${field.default_value || 'N/A'}\` |\\n`;

});

markdown += `\\n`;

}

if (doc.sources.length > 0) {

markdown += `### Source Definition\\n\\n`;

markdown += `\`\`\`${doc.sources[0].encoding}\\n`;

markdown += doc.sources[0].raw_file_contents;

markdown += `\`\`\`\\n\\n`;

}

markdown += `---\\n\\n`;

let markdown = `# Type Documentation for Node: ${nodeName}

`;

markdown += `Generated on: ${new Date().toISOString()}

`;

this.documentation.forEach((doc) => {

markdown += `## ${doc.typeName}

`;

markdown += `**Topic**: \`${doc.topicName}\`

`;

if (doc.description.fields.length > 0) {

markdown += `### Fields

`;

markdown += `| Field Name | Type | Default Value |

`;

markdown += `|------------|------|---------------|

`;

doc.description.fields.forEach((field) => {

const typeStr = this.formatFieldTypeForDoc(field.type);

markdown += `| \`${field.name}\` | ${typeStr} | \`${field.default_value || 'N/A'}\` |

`;

});

markdown += `

`;

}

if (doc.sources.length > 0) {

markdown += `### Source Definition

`;

markdown += `\`\`\`${doc.sources[0].encoding}

`;

markdown += doc.sources[0].raw_file_contents;

markdown += `\`\`\`

`;

}

markdown += `---

`;

Copilot · 2025-09-19T03:22:33Z

+    console.log('\\n=== Type Hierarchy ===');
+    this.typeHierarchy.forEach((typeInfo, typeName) => {
+      console.log(`\\n${typeName}:`);


The escaped newline character should be a literal newline. Replace \\n with \n.

Suggested change

console.log('\\n=== Type Hierarchy ===');

this.typeHierarchy.forEach((typeInfo, typeName) => {

console.log(`\\n${typeName}:`);

console.log('\n=== Type Hierarchy ===');

this.typeHierarchy.forEach((typeInfo, typeName) => {

console.log(`\n${typeName}:`);

Copilot · 2025-09-19T03:22:34Z

+    console.log('\\n=== Type Hierarchy ===');
+    this.typeHierarchy.forEach((typeInfo, typeName) => {
+      console.log(`\\n${typeName}:`);


The escaped newline character should be a literal newline. Replace \\n with \n.

Suggested change

console.log('\\n=== Type Hierarchy ===');

this.typeHierarchy.forEach((typeInfo, typeName) => {

console.log(`\\n${typeName}:`);

console.log('\n=== Type Hierarchy ===');

this.typeHierarchy.forEach((typeInfo, typeName) => {

console.log(`\n${typeName}:`);

Copilot · 2025-09-19T03:22:34Z

+    const minTime = Math.min(...this.queryTimes);
+    const maxTime = Math.max(...this.queryTimes);
+
+    console.log('\\n=== Performance Results ===');


The escaped newline character should be a literal newline. Replace \\n with \n.

Suggested change

console.log('\\n=== Performance Results ===');

console.log('\n=== Performance Results ===');

coveralls · 2025-09-19T03:33:43Z

coverage: 84.368% (+0.06%) from 84.306%
when pulling e6009b0 on minggangw:fix-1267
into f459eab on RobotWebTools:develop.

This PR adds a comprehensive tutorial for the Type Description Service feature in rclnodejs. The tutorial provides detailed documentation on how to use the built-in ROS 2 introspection service that allows querying message and service type information from running nodes. Key changes: - Complete tutorial covering Type Description Service functionality, requirements, and usage patterns - Multiple practical examples demonstrating basic usage, advanced features, and best practices - Comprehensive troubleshooting guide and performance considerations Fix: #1267

Add tutorial for type description service

dce6824

Copilot AI review requested due to automatic review settings September 19, 2025 03:19

Copilot AI reviewed Sep 19, 2025

View reviewed changes

Address comments

e6009b0

minggangw merged commit 8aaa068 into RobotWebTools:develop Sep 19, 2025
18 checks passed

	console.log(`\\nDiscovering types for node: ${nodeName}`);
	console.log(`\nDiscovering types for node: ${nodeName}`);

	console.log(`\\n=== Type: ${typeName} ===`);
	console.log(`\n=== Type: ${typeName} ===`);

	console.log(`\\n=== Discovery Summary ===`);
	console.log(`\n=== Discovery Summary ===`);

	console.log('\\n=== Performance Results ===');
	console.log('\n=== Performance Results ===');

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minggangw commented Sep 19, 2025 •

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