510 lines
19 KiB
Python
510 lines
19 KiB
Python
"""
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NASA JPL Horizons data query service
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"""
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from datetime import datetime, timedelta
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from astropy.time import Time
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import logging
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import re
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import httpx
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import os
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from app.models.celestial import Position, CelestialBody
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from app.config import settings
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logger = logging.getLogger(__name__)
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class HorizonsService:
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"""Service for querying NASA JPL Horizons system"""
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def __init__(self):
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"""Initialize the service"""
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self.location = "@sun" # Heliocentric coordinates
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# Proxy is handled via settings.proxy_dict in each request
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async def get_object_data_raw(self, body_id: str) -> str:
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"""
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Get raw object data (terminal style text) from Horizons
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Args:
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body_id: JPL Horizons ID
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Returns:
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Raw text response from NASA
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"""
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url = "https://ssd.jpl.nasa.gov/api/horizons.api"
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# Ensure ID is quoted for COMMAND
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cmd_val = f"'{body_id}'" if not body_id.startswith("'") else body_id
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params = {
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"format": "text",
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"COMMAND": cmd_val,
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"OBJ_DATA": "YES",
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"MAKE_EPHEM": "NO",
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"EPHEM_TYPE": "VECTORS",
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"CENTER": "@sun"
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}
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try:
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# Configure proxy if available
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client_kwargs = {"timeout": settings.nasa_api_timeout}
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if settings.proxy_dict:
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client_kwargs["proxies"] = settings.proxy_dict
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logger.info(f"Using proxy for NASA API: {settings.proxy_dict}")
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async with httpx.AsyncClient(**client_kwargs) as client:
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logger.info(f"Fetching raw data for body {body_id} with timeout {settings.nasa_api_timeout}s")
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response = await client.get(url, params=params)
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if response.status_code != 200:
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raise Exception(f"NASA API returned status {response.status_code}")
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return response.text
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except Exception as e:
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logger.error(f"Error fetching raw data for {body_id}: {str(e)}")
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raise
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async def get_body_positions(
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self,
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body_id: str,
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start_time: datetime | None = None,
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end_time: datetime | None = None,
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step: str = "1d",
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) -> list[Position]:
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"""
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Get positions for a celestial body over a time range
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Args:
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body_id: JPL Horizons ID (e.g., '-31' for Voyager 1)
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start_time: Start datetime (default: now)
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end_time: End datetime (default: now)
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step: Time step (e.g., '1d' for 1 day, '1h' for 1 hour)
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Returns:
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List of Position objects
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"""
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try:
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# Set default times
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if start_time is None:
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start_time = datetime.utcnow()
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if end_time is None:
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end_time = start_time
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# Format time for Horizons (YYYY-MM-DD HH:MM)
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# Horizons accepts ISO-like format without 'T'
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start_str = start_time.strftime('%Y-%m-%d %H:%M')
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end_str = end_time.strftime('%Y-%m-%d %H:%M')
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# Special case for single point query (start = end)
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# Horizons requires START != STOP for ranges, but we can handle single point
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# by making a very small range or just asking for 1 step.
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# Actually Horizons API is fine with start=end if we don't ask for range?
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# Let's keep using range parameters as standard.
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if start_time == end_time:
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# Just add 1 minute for range, but we only parse the first result
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end_dummy = end_time + timedelta(minutes=1)
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end_str = end_dummy.strftime('%Y-%m-%d %H:%M')
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# Override step to ensure we get the start point
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# But wait, '1d' step might skip.
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# If start==end, we want exactly one point.
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# We can't use '1' count in API easily via URL params without STEP_SIZE?
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# Let's just use the provided step.
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logger.info(f"Querying Horizons (httpx) for body {body_id} from {start_str} to {end_str}")
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url = "https://ssd.jpl.nasa.gov/api/horizons.api"
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cmd_val = f"'{body_id}'" if not body_id.startswith("'") else body_id
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params = {
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"format": "text",
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"COMMAND": cmd_val,
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"OBJ_DATA": "NO",
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"MAKE_EPHEM": "YES",
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"EPHEM_TYPE": "VECTORS",
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"CENTER": self.location,
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"START_TIME": start_str,
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"STOP_TIME": end_str,
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"STEP_SIZE": step,
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"CSV_FORMAT": "YES"
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}
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# Configure proxy if available
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client_kwargs = {"timeout": settings.nasa_api_timeout}
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if settings.proxy_dict:
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client_kwargs["proxies"] = settings.proxy_dict
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async with httpx.AsyncClient(**client_kwargs) as client:
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response = await client.get(url, params=params)
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if response.status_code != 200:
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raise Exception(f"NASA API returned status {response.status_code}")
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return self._parse_vectors(response.text)
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except Exception as e:
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logger.error(f"Error querying Horizons for body {body_id}: {str(e)}")
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raise
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def _parse_vectors(self, text: str) -> list[Position]:
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"""
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Parse Horizons CSV output for vector data
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Format looks like:
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$$SOE
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2460676.500000000, A.D. 2025-Jan-01 00:00:00.0000, 9.776737278236609E-01, -1.726677228793678E-01, -1.636678733289160E-05, ...
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$$EOE
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"""
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positions = []
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# Extract data block between $$SOE and $$EOE
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match = re.search(r'\$\$SOE(.*?)\$\$EOE', text, re.DOTALL)
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if not match:
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logger.warning("No data block ($$SOE...$$EOE) found in Horizons response")
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# Log a snippet of text for debugging
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logger.debug(f"Response snippet: {text[:200]}...")
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return []
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data_block = match.group(1).strip()
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lines = data_block.split('\n')
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for line in lines:
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parts = [p.strip() for p in line.split(',')]
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if len(parts) < 5:
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continue
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try:
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# Index 0: JD, 1: Date, 2: X, 3: Y, 4: Z, 5: VX, 6: VY, 7: VZ
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# Time parsing: 2460676.500000000 is JD.
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# A.D. 2025-Jan-01 00:00:00.0000 is Calendar.
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# We can use JD or parse the string. Using JD via astropy is accurate.
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jd_str = parts[0]
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time_obj = Time(float(jd_str), format="jd").datetime
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x = float(parts[2])
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y = float(parts[3])
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z = float(parts[4])
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# Velocity if available (indices 5, 6, 7)
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vx = float(parts[5]) if len(parts) > 5 else None
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vy = float(parts[6]) if len(parts) > 6 else None
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vz = float(parts[7]) if len(parts) > 7 else None
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pos = Position(
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time=time_obj,
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x=x,
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y=y,
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z=z,
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vx=vx,
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vy=vy,
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vz=vz
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)
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positions.append(pos)
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except ValueError as e:
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logger.warning(f"Failed to parse line: {line}. Error: {e}")
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continue
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return positions
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"""
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NASA JPL Horizons data query service
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"""
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from datetime import datetime, timedelta
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# from astroquery.jplhorizons import Horizons # Removed astroquery dependency
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from astropy.time import Time # Kept astropy for Time object
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import logging
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import re
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import httpx
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import os
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from app.models.celestial import Position, CelestialBody
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from app.config import settings
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logger = logging.getLogger(__name__)
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class HorizonsService:
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"""Service for querying NASA JPL Horizons system"""
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def __init__(self):
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"""Initialize the service"""
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self.location = "@sun" # Heliocentric coordinates
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# Proxy is handled via settings.proxy_dict in each request
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async def get_object_data_raw(self, body_id: str) -> str:
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"""
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Get raw object data (terminal style text) from Horizons
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Args:
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body_id: JPL Horizons ID
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Returns:
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Raw text response from NASA
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"""
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url = "https://ssd.jpl.nasa.gov/api/horizons.api"
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# Ensure ID is quoted for COMMAND
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cmd_val = f"'{body_id}'" if not body_id.startswith("'") else body_id
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params = {
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"format": "text",
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"COMMAND": cmd_val,
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"OBJ_DATA": "YES",
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"MAKE_EPHEM": "NO",
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"EPHEM_TYPE": "VECTORS",
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"CENTER": "@sun"
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}
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try:
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# Configure proxy if available
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client_kwargs = {"timeout": settings.nasa_api_timeout}
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if settings.proxy_dict:
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client_kwargs["proxies"] = settings.proxy_dict
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logger.info(f"Using proxy for NASA API: {settings.proxy_dict}")
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async with httpx.AsyncClient(**client_kwargs) as client:
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logger.info(f"Fetching raw data for body {body_id} with timeout {settings.nasa_api_timeout}s")
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response = await client.get(url, params=params)
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if response.status_code != 200:
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raise Exception(f"NASA API returned status {response.status_code}")
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return response.text
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except Exception as e:
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logger.error(f"Error fetching raw data for {body_id}: {str(e)}")
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raise
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async def get_body_positions(
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self,
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body_id: str,
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start_time: datetime | None = None,
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end_time: datetime | None = None,
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step: str = "1d",
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) -> list[Position]:
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"""
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Get positions for a celestial body over a time range
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Args:
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body_id: JPL Horizons ID (e.g., '-31' for Voyager 1)
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start_time: Start datetime (default: now)
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end_time: End datetime (default: now)
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step: Time step (e.g., '1d' for 1 day, '1h' for 1 hour)
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Returns:
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List of Position objects
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"""
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try:
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# Set default times
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if start_time is None:
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start_time = datetime.utcnow()
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if end_time is None:
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end_time = start_time
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# Format time for Horizons (YYYY-MM-DD HH:MM)
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# Horizons accepts ISO-like format without 'T'
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start_str = start_time.strftime('%Y-%m-%d %H:%M')
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end_str = end_time.strftime('%Y-%m-%d %H:%M')
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# Special case for single point query (start = end)
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# Horizons requires START != STOP for ranges, but we can handle single point
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# by making a very small range or just asking for 1 step.
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# Actually Horizons API is fine with start=end if we don't ask for range?
|
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# Let's keep using range parameters as standard.
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if start_time == end_time:
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# Just add 1 minute for range, but we only parse the first result
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end_dummy = end_time + timedelta(minutes=1)
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end_str = end_dummy.strftime('%Y-%m-%d %H:%M')
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# Override step to ensure we get the start point
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# But wait, '1d' step might skip.
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# If start==end, we want exactly one point.
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# We can't use '1' count in API easily via URL params without STEP_SIZE?
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# Let's just use the provided step.
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logger.info(f"Querying Horizons (httpx) for body {body_id} from {start_str} to {end_str}")
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url = "https://ssd.jpl.nasa.gov/api/horizons.api"
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cmd_val = f"'{body_id}'" if not body_id.startswith("'") else body_id
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params = {
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"format": "text",
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"COMMAND": cmd_val,
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"OBJ_DATA": "NO",
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"MAKE_EPHEM": "YES",
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"EPHEM_TYPE": "VECTORS",
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"CENTER": self.location,
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"START_TIME": start_str,
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"STOP_TIME": end_str,
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"STEP_SIZE": step,
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"CSV_FORMAT": "YES"
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}
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# Configure proxy if available
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client_kwargs = {"timeout": settings.nasa_api_timeout}
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if settings.proxy_dict:
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client_kwargs["proxies"] = settings.proxy_dict
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async with httpx.AsyncClient(**client_kwargs) as client:
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response = await client.get(url, params=params)
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if response.status_code != 200:
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raise Exception(f"NASA API returned status {response.status_code}")
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return self._parse_vectors(response.text)
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except Exception as e:
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logger.error(f"Error querying Horizons for body {body_id}: {str(e)}")
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raise
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def _parse_vectors(self, text: str) -> list[Position]:
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"""
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Parse Horizons CSV output for vector data
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Format looks like:
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$$SOE
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2460676.500000000, A.D. 2025-Jan-01 00:00:00.0000, 9.776737278236609E-01, -1.726677228793678E-01, -1.636678733289160E-05, ...
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$$EOE
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"""
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positions = []
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# Extract data block between $$SOE and $$EOE
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match = re.search(r'\$\$SOE(.*?)\$\$EOE', text, re.DOTALL)
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if not match:
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logger.warning("No data block ($$SOE...$$EOE) found in Horizons response")
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# Log a snippet of text for debugging
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logger.debug(f"Response snippet: {text[:200]}...")
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return []
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data_block = match.group(1).strip()
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lines = data_block.split('\n')
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for line in lines:
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parts = [p.strip() for p in line.split(',')]
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if len(parts) < 5:
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continue
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try:
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# Index 0: JD, 1: Date, 2: X, 3: Y, 4: Z, 5: VX, 6: VY, 7: VZ
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# Time parsing: 2460676.500000000 is JD.
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# A.D. 2025-Jan-01 00:00:00.0000 is Calendar.
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# We can use JD or parse the string. Using JD via astropy is accurate.
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jd_str = parts[0]
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time_obj = Time(float(jd_str), format="jd").datetime
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x = float(parts[2])
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y = float(parts[3])
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z = float(parts[4])
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# Velocity if available (indices 5, 6, 7)
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vx = float(parts[5]) if len(parts) > 5 else None
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vy = float(parts[6]) if len(parts) > 6 else None
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vz = float(parts[7]) if len(parts) > 7 else None
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pos = Position(
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time=time_obj,
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x=x,
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y=y,
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z=z,
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vx=vx,
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vy=vy,
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vz=vz
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)
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positions.append(pos)
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except ValueError as e:
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logger.warning(f"Failed to parse line: {line}. Error: {e}")
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continue
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return positions
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async def search_body_by_name(self, name: str, db: AsyncSession) -> dict:
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"""
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Search for a celestial body by name in NASA Horizons database using httpx.
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This method replaces the astroquery-based search to unify proxy and timeout control.
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"""
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try:
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logger.info(f"Searching Horizons (httpx) for: {name}")
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url = "https://ssd.jpl.nasa.gov/api/horizons.api"
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cmd_val = f"'{name}'" # Name can be ID or actual name
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params = {
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"format": "text",
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"COMMAND": cmd_val,
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"OBJ_DATA": "YES", # Request object data to get canonical name/ID
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"MAKE_EPHEM": "NO", # Don't need ephemeris
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"EPHEM_TYPE": "OBSERVER", # Arbitrary, won't be used since MAKE_EPHEM=NO
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"CENTER": "@ssb" # Search from Solar System Barycenter for consistent object IDs
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}
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timeout = await self._get_timeout(db)
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client_kwargs = {"timeout": timeout}
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if settings.proxy_dict:
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client_kwargs["proxies"] = settings.proxy_dict
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async with httpx.AsyncClient(**client_kwargs) as client:
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response = await client.get(url, params=params)
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if response.status_code != 200:
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raise Exception(f"NASA API returned status {response.status_code}")
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response_text = response.text
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# Check for "Ambiguous target name"
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if "Ambiguous target name" in response_text:
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logger.warning(f"Ambiguous target name for: {name}")
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return {
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"success": False,
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"id": None,
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"name": None,
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"full_name": None,
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"error": "名称不唯一，请提供更具体的名称或 JPL Horizons ID"
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}
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# Check for "No matches found" or "Unknown target"
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if "No matches found" in response_text or "Unknown target" in response_text:
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logger.warning(f"No matches found for: {name}")
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return {
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"success": False,
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"id": None,
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"name": None,
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"full_name": None,
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"error": "未找到匹配的天体，请检查名称或 ID"
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}
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# Parse canonical name and ID from response (e.g., "Target body name: Jupiter Barycenter (599)")
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target_name_match = re.search(r"Target body name: (.+?)\s+\((\-?\d+)\)", response_text)
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if target_name_match:
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full_name = target_name_match.group(1).strip()
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numeric_id = target_name_match.group(2).strip()
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short_name = full_name.split('(')[0].strip() # Remove any part after '('
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logger.info(f"Found target: {full_name} with ID: {numeric_id}")
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return {
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"success": True,
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"id": numeric_id,
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"name": short_name,
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"full_name": full_name,
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"error": None
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}
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else:
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# Fallback if specific pattern not found, might be a valid but weird response
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logger.warning(f"Could not parse target name/ID from response for: {name}. Response snippet: {response_text[:200]}")
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return {
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"success": False,
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"id": None,
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"name": None,
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"full_name": None,
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"error": f"未能解析 JPL Horizons 响应，请尝试精确 ID: {name}"
|
|
}
|
|
|
|
except Exception as e:
|
|
error_msg = str(e)
|
|
logger.error(f"Error searching for {name}: {error_msg}")
|
|
return {
|
|
"success": False,
|
|
"id": None,
|
|
"name": None,
|
|
"full_name": None,
|
|
"error": f"查询失败: {error_msg}"
|
|
}
|
|
|
|
# Singleton instance
|
|
horizons_service = HorizonsService() |