Coverage for /usr/local/lib/python3.7/dist-packages/pyrocko/streaming/slink.py : 27%

# http://pyrocko.org - GPLv3 

# 

# The Pyrocko Developers, 21st Century 

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

from __future__ import absolute_import 

import subprocess 

import time 

import os 

import signal 

import select 

import logging 

import tempfile 

from pyrocko.io import mseed 

logger = logging.getLogger('pyrocko.streaming.slink') 

RECORD_LENGTH = 512 

def preexec(): 

os.setpgrp() 

class SlowSlinkError(Exception): 

pass 

class SlowSlink(object): 

def __init__(self, host='geofon.gfz-potsdam.de', port=18000): 

self.host = host 

self.port = port 

self.running = False 

self.stream_selectors = [] 

def query_streams(self): 

cmd = ['slinktool', '-Q', self.host+':'+str(self.port)] 

logger.debug('Running %s' % ' '.join(cmd)) 

try: 

slink = subprocess.Popen(cmd, stdout=subprocess.PIPE) 

except OSError as e: 

raise SlowSlinkError('Could not start "slinktool": %s' % str(e)) 

(a, b) = slink.communicate() 

streams = [] 

for line in a.splitlines(): 

line = line.decode() 

toks = line.split() 

if len(toks) == 9: 

net, sta, loc, cha = toks[0], toks[1], '', toks[2] 

else: 

net, sta, loc, cha = toks[0], toks[1], toks[2], toks[3] 

streams.append((net, sta, loc, cha)) 

return streams 

def add_stream(self, network, station, location, channel): 

self.stream_selectors.append( 

'%s_%s:%s.D' % (network, station, channel)) 

def add_raw_stream_selector(self, stream_selector): 

self.stream_selectors.append(stream_selector) 

def acquisition_start(self): 

assert not self.running 

if self.stream_selectors: 

streams = ['-S', ','.join(self.stream_selectors)] 

else: 

streams = [] 

cmd = ['slinktool', '-o', '-'] \ 

+ streams + [self.host+':'+str(self.port)] 

logger.debug('Starting %s' % ' '.join(cmd)) 

self.running = True 

self.header = None 

self.vals = [] 

try: 

self.slink = subprocess.Popen( 

cmd, 

stdout=subprocess.PIPE, 

preexec_fn=preexec, 

close_fds=True) 

except OSError as e: 

raise SlowSlinkError('Could not start "slinktool": %s' % str(e)) 

logger.debug('Started.') 

def acquisition_stop(self): 

self.acquisition_request_stop() 

def acquisition_request_stop(self): 

if not self.running: 

return 

self.running = False # intentionally before the kill 

os.kill(self.slink.pid, signal.SIGTERM) 

logger.debug("Waiting for slinktool to terminate...") 

it = 0 

while self.slink.poll() == -1: 

time.sleep(0.01) 

if it == 200: 

logger.debug( 

"Waiting for slinktool to terminate... trying harder...") 

os.kill(self.slink.pid, signal.SIGKILL) 

it += 1 

logger.debug("Done, slinktool has terminated") 

def process(self): 

try: 

ready, _, _ = select.select([self.slink.stdout], [], [], .2) 

if not ready: 

return False 

line = self.slink.stdout.read(RECORD_LENGTH) 

with tempfile.NamedTemporaryFile(prefix='slink-stream') as f: 

f.write(line) 

f.flush() 

traces = mseed.iload(f.name) 

for tr in traces: 

self.got_trace(tr) 

return True 

except Exception as e: 

logger.debug(e) 

return False 

def got_trace(self, tr): 

logger.info('Got trace from slinktool: %s' % tr)