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feat(mcp): MCP service implementation (PRs 3-9 consolidated) (#35877)
This commit is contained in:
Amin Ghadersohi
168
superset/mcp_service/chart/tool/update_chart_preview.py
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168
superset/mcp_service/chart/tool/update_chart_preview.py
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# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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"""
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MCP tool: update_chart_preview
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"""
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import logging
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import time
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from typing import Any, Dict
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from fastmcp import Context
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from superset.mcp_service.app import mcp
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from superset.mcp_service.auth import mcp_auth_hook
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from superset.mcp_service.chart.chart_utils import (
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analyze_chart_capabilities,
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analyze_chart_semantics,
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generate_chart_name,
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generate_explore_link,
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map_config_to_form_data,
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)
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from superset.mcp_service.chart.schemas import (
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AccessibilityMetadata,
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PerformanceMetadata,
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UpdateChartPreviewRequest,
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URLPreview,
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)
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from superset.mcp_service.utils.url_utils import get_mcp_service_url
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logger = logging.getLogger(__name__)
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@mcp.tool
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@mcp_auth_hook
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def update_chart_preview(
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request: UpdateChartPreviewRequest, ctx: Context
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) -> Dict[str, Any]:
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"""Update cached chart preview without saving.
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IMPORTANT:
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- Modifies cached form_data from generate_chart (save_chart=False)
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- Original form_data_key is invalidated, new one returned
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- LLM clients MUST display explore_url to users
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- Embed preview_url as image: 
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Use when:
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- Modifying preview before deciding to save
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- Iterating on chart design without creating permanent charts
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- Testing different configurations
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Returns new form_data_key, preview images, and explore URL.
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"""
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start_time = time.time()
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try:
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# Map the new config to form_data format
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new_form_data = map_config_to_form_data(request.config)
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# Generate new explore link with updated form_data
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explore_url = generate_explore_link(request.dataset_id, new_form_data)
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# Extract new form_data_key from the explore URL
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new_form_data_key = None
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if "form_data_key=" in explore_url:
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new_form_data_key = explore_url.split("form_data_key=")[1].split("&")[0]
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# Generate semantic analysis
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capabilities = analyze_chart_capabilities(None, request.config)
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semantics = analyze_chart_semantics(None, request.config)
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# Create performance metadata
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execution_time = int((time.time() - start_time) * 1000)
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performance = PerformanceMetadata(
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query_duration_ms=execution_time,
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cache_status="miss",
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optimization_suggestions=[],
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)
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# Create accessibility metadata
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chart_name = generate_chart_name(request.config)
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accessibility = AccessibilityMetadata(
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color_blind_safe=True, # Would need actual analysis
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alt_text=f"Updated chart preview showing {chart_name}",
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high_contrast_available=False,
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)
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# Generate previews if requested
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previews = {}
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if request.generate_preview and new_form_data_key:
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try:
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for format_type in request.preview_formats:
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if format_type == "url":
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# Generate screenshot URL using new form_data key
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mcp_base = get_mcp_service_url()
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preview_url = (
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f"{mcp_base}/screenshot/explore/{new_form_data_key}.png"
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)
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previews[format_type] = URLPreview(
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preview_url=preview_url,
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width=800,
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height=600,
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supports_interaction=False,
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)
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# Other formats would need form_data execution
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# which is more complex for preview-only mode
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except Exception as e:
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# Log warning but don't fail the entire request
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logger.warning("Preview generation failed: %s", e)
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# Return enhanced data
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result = {
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"chart": {
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"id": None,
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"slice_name": chart_name,
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"viz_type": new_form_data.get("viz_type"),
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"url": explore_url,
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"uuid": None,
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"saved": False,
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"updated": True,
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},
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"error": None,
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# Enhanced fields for better LLM integration
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"previews": previews,
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"capabilities": capabilities.model_dump() if capabilities else None,
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"semantics": semantics.model_dump() if semantics else None,
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"explore_url": explore_url,
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"form_data_key": new_form_data_key,
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"previous_form_data_key": request.form_data_key, # For reference
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"api_endpoints": {}, # No API endpoints for unsaved charts
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"performance": performance.model_dump() if performance else None,
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"accessibility": accessibility.model_dump() if accessibility else None,
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"success": True,
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"schema_version": "2.0",
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"api_version": "v1",
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}
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return result
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except Exception as e:
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execution_time = int((time.time() - start_time) * 1000)
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return {
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"chart": None,
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"error": f"Chart preview update failed: {str(e)}",
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"performance": {
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"query_duration_ms": execution_time,
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"cache_status": "error",
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"optimization_suggestions": [],
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},
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"success": False,
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"schema_version": "2.0",
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"api_version": "v1",
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}
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