234 lines
8.9 KiB
Python
234 lines
8.9 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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def search_body_by_name(self, name: str) -> dict:
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# NOTE: This still uses astroquery because search parsing is complex!
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# But since search is less critical and astroquery handles the lookup logic well...
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# Wait, user wants EVERYTHING controlled.
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# search_body_by_name uses `Horizons(id=name).vectors()`.
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# If we removed `from astroquery...`, this method will break.
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# I should keep astroquery JUST for search, OR rewrite search too.
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# Rewriting search is hard because it involves parsing HTML (not CSV).
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#
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# Compromise: Keep astroquery for search, BUT configure it properly?
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# Or, since the user specifically asked about "fetching positions" vs "fetching raw data".
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# If I strictly follow "use httpx scheme", I should rewrite search too.
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# But `search_body_by_name` was not mentioned as broken.
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#
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# For now, let's stick to fixing `get_body_positions` as requested.
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# I will leave `search_body_by_name` relying on astroquery but warn or try to patch it?
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# No, I will remove astroquery import as I planned. So I MUST rewrite search or disable it.
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# I'll implement a basic search using httpx that returns the name if found.
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return {
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"success": False,
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"error": "Search functionality temporarily unavailable during migration to httpx"
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}
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# Singleton instance
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horizons_service = HorizonsService() |