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# http://pyrocko.org - GPLv3 

# 

# The Pyrocko Developers, 21st Century 

# ---|P------/S----------~Lg---------- 

 

''' 

Access to some IRIS (non-FDSN) web services. 

''' 

 

from __future__ import absolute_import 

 

 

import logging 

import re 

from xml.parsers.expat import ParserCreate 

 

from pyrocko import util, pz, model 

from pyrocko.util import Request, HTTPError, urlopen, urlencode 

 

 

logger = logging.getLogger('pyrocko.client.iris') 

 

base_url = 'http://service.iris.edu/irisws' 

 

 

def tdate(s): 

return util.str_to_time(s, '%Y-%m-%d') 

 

 

def sdate(t): 

return util.time_to_str(t, '%Y-%m-%d') 

 

 

def tdatetime(s): 

return util.str_to_time(s, format='%Y-%m-%dT%H:%M:%S') 

 

 

def sdatetime(t): 

return util.time_to_str(t, format='%Y-%m-%dT%H:%M:%S') 

 

 

class Element(object): 

 

def __init__(self, name, depth, attrs): 

self.name = name 

self.depth = depth 

self.attrs = attrs 

 

def __getattr__(self, k): 

return self.attrs[k] 

 

def __str__(self): 

return '%s:\n ' % self.name + '\n '.join( 

'%s : %s' % (k, v) for (k, v) in self.attrs.items()) 

 

 

class XMLZipHandler(object): 

 

def __init__(self, watch): 

self.watch = watch 

self.stack = [] 

self.wstack = [] 

self.outstack = [] 

 

def startElement(self, name, attrs): 

self.stack.append((name, [])) 

if len(self.wstack) < len(self.watch) and \ 

name == self.watch[len(self.wstack)]: 

 

el = Element(name, len(self.stack), dict(attrs.items())) 

self.wstack.append(el) 

 

def characters(self, content): 

if self.wstack and len(self.stack) == self.wstack[-1].depth + 1: 

if content.strip(): 

self.stack[-1][1].append(content) 

 

def endElement(self, name): 

if self.wstack: 

if len(self.stack) == self.wstack[-1].depth + 1 and \ 

self.stack[-1][1]: 

 

self.wstack[-1].attrs[name] = ''.join(self.stack[-1][1]) 

 

if name == self.watch[len(self.wstack)-1]: 

if len(self.wstack) == len(self.watch): 

self.outstack.append(list(self.wstack)) 

 

self.wstack.pop() 

 

self.stack.pop() 

 

def getQueuedElements(self): 

outstack = self.outstack 

self.outstack = [] 

return outstack 

 

 

def xmlzip(source, watch, bufsize=10000): 

parser = ParserCreate() 

handler = XMLZipHandler(watch) 

 

parser.StartElementHandler = handler.startElement 

parser.EndElementHandler = handler.endElement 

parser.CharacterDataHandler = handler.characters 

 

while True: 

data = source.read(bufsize) 

if not data: 

break 

 

parser.Parse(data, False) 

for elements in handler.getQueuedElements(): 

yield elements 

 

parser.Parse('', True) 

for elements in handler.getQueuedElements(): 

yield elements 

 

 

class NotFound(Exception): 

''' 

Raised when the server sends an 404 response. 

''' 

def __init__(self, url): 

Exception.__init__(self) 

self._url = url 

 

def __str__(self): 

return 'No results for request %s' % self._url 

 

 

def ws_request(url, post=False, **kwargs): 

url_values = urlencode(kwargs) 

url = url + '?' + url_values 

logger.debug('Accessing URL %s' % url) 

 

req = Request(url) 

if post: 

req.add_data(post) 

 

req.add_header('Accept', '*/*') 

 

try: 

return urlopen(req) 

 

except HTTPError as e: 

if e.code == 404: 

raise NotFound(url) 

else: 

raise e 

 

 

def ws_virtualnetwork(**kwargs): 

''' 

Query IRIS virtualnetwork web service. 

''' 

 

for k in 'starttime', 'endtime': 

if k in kwargs: 

kwargs[k] = sdate(kwargs[k]) 

 

if 'timewindow' in kwargs: 

tmin, tmax = kwargs.pop('timewindow') 

kwargs['starttime'] = sdate(tmin) 

kwargs['endtime'] = sdate(tmax) 

 

return ws_request(base_url + '/virtualnetwork/1/query', **kwargs) 

 

 

def ws_sacpz( 

network=None, 

station=None, 

location=None, 

channel=None, 

time=None, 

tmin=None, 

tmax=None): 

''' 

Query IRIS sacpz web service. 

''' 

 

d = {} 

if network: 

d['network'] = network 

if station: 

d['station'] = station 

if location: 

d['location'] = location 

else: 

d['location'] = '--' 

if channel: 

d['channel'] = channel 

 

if tmin is not None and tmax is not None: 

d['starttime'] = sdatetime(tmin) 

d['endtime'] = sdatetime(tmax) 

elif time is not None: 

d['time'] = sdatetime(time) 

 

return ws_request(base_url + '/sacpz/1/query', **d) 

 

 

def ws_resp( 

network=None, 

station=None, 

location=None, 

channel=None, 

time=None, 

tmin=None, 

tmax=None): 

''' 

Query IRIS resp web service. 

''' 

 

d = {} 

if network: 

d['network'] = network 

if station: 

d['station'] = station 

if location: 

d['location'] = location 

else: 

d['location'] = '--' 

if channel: 

d['channel'] = channel 

 

if tmin is not None and tmax is not None: 

d['starttime'] = sdatetime(tmin) 

d['endtime'] = sdatetime(tmax) 

elif time is not None: 

d['time'] = sdatetime(time) 

 

return ws_request(base_url + '/resp/1/query', **d) 

 

 

class ChannelInfo(object): 

def __init__( 

self, network, station, location, channel, start, end, azimuth, 

dip, elevation, depth, latitude, longitude, sample, input, output, 

zpk): 

 

self.network = network 

self.station = station 

self.location = location 

self.channel = channel 

self.start = start 

self.end = end 

self.azimuth = azimuth 

self.dip = dip 

self.elevation = elevation 

self.depth = depth 

self.latitude = latitude 

self.longitude = longitude 

self.sample = sample 

self.input = input 

self.output = output 

self.zpk = zpk 

 

def __str__(self): 

return '%s.%s.%s.%s' % ( 

self.network, self.station, self.location, self.channel) 

 

 

def nslc(x): 

return x.network, x.station, x.location, x.channel 

 

 

def grok_sacpz(data): 

pzlines = [] 

d = {} 

responses = [] 

float_keys = ('latitude', 'longitude', 'elevation', 'depth', 'dip', 

'azimuth', 'sample') 

string_keys = ('input', 'output', 'network', 'station', 'location', 

'channel') 

time_keys = ('start', 'end') 

for line in data.splitlines(): 

line = line.strip() 

if line.startswith('*'): 

if pzlines: 

if any(pzlines): 

d['zpk'] = pz.read_sac_zpk(string='\n'.join(pzlines)) 

responses.append(d) 

d = {} 

pzlines = [] 

 

m = re.match(r'^\* ([A-Z]+)[^:]*:(.*)$', line) 

if m: 

k, v = m.group(1).lower(), m.group(2).strip() 

if k in d: 

assert False, 'duplicate entry? %s' % k 

 

if k in float_keys: 

d[k] = float(v) 

elif k in string_keys: 

d[k] = v 

elif k in time_keys: 

d[k] = tdatetime(v) 

 

else: 

pzlines.append(line) 

 

if pzlines and any(pzlines): 

d['zpk'] = pz.read_sac_zpk(string='\n'.join(pzlines)) 

responses.append(d) 

 

cis = {} 

for kwargs in responses: 

try: 

for k in float_keys + string_keys + time_keys: 

if k not in kwargs: 

logger.error('Missing entry: %s' % k) 

raise Exception() 

 

ci = ChannelInfo(**kwargs) 

 

cis[nslc(ci)] = ci 

 

except Exception: 

logger.error('Error while parsing SACPZ data') 

 

return cis 

 

 

def grok_station_xml(data, tmin, tmax): 

 

stations = {} 

 

for (sta, sta_epo, cha, cha_epo) in xmlzip(data, ( 

'Station', 'StationEpoch', 'Channel', 'Epoch')): 

 

sta_beg, sta_end, cha_beg, cha_end = [tdatetime(x) for x in ( 

sta_epo.StartDate, sta_epo.EndDate, cha_epo.StartDate, 

cha_epo.EndDate)] 

 

if not (sta_beg <= tmin and tmax <= sta_end and 

cha_beg <= tmin and tmax <= cha_end): 

 

continue 

 

nslc = tuple([str(x.strip()) for x in ( 

sta.net_code, sta.sta_code, cha.loc_code, cha.chan_code)]) 

 

lat, lon, ele, dep, azi, dip = [ 

float(cha_epo.attrs[x]) 

for x in 'Lat Lon Elevation Depth Azimuth Dip'.split()] 

 

nsl = nslc[:3] 

if nsl not in stations: 

stations[nsl] = model.Station( 

nsl[0], nsl[1], nsl[2], lat, lon, ele, dep) 

 

stations[nsl].add_channel(model.station.Channel(nslc[-1], azi, dip)) 

 

return list(stations.values()) 

 

 

def grok_virtualnet_xml(data): 

net_sta = set() 

 

for network, station in xmlzip(data, ('network', 'station')): 

net_sta.add((network.code, station.code)) 

 

return net_sta 

 

 

def data_selection(stations, tmin, tmax, channel_prio=[ 

['BHZ', 'HHZ'], 

['BH1', 'BHN', 'HH1', 'HHN'], 

['BH2', 'BHE', 'HH2', 'HHE']]): 

 

selection = [] 

for station in stations: 

wanted = [] 

for group in channel_prio: 

gchannels = [] 

for channel in station.get_channels(): 

if channel.name in group: 

gchannels.append(channel) 

if gchannels: 

gchannels.sort(key=lambda a: group.index(a.name)) 

wanted.append(gchannels[0]) 

 

if wanted: 

for channel in wanted: 

selection.append(( 

station.network, station.station, station.location, 

channel.name, tmin, tmax)) 

 

return selection