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# http://pyrocko.org - GPLv3 

# 

# The Pyrocko Developers, 21st Century 

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

""" 

Simple async HTTP server 

 

Based on this recipe: 

 

http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/440665 

 

which is based on this one: 

 

http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/259148 

""" 

from __future__ import absolute_import 

from future import standard_library 

standard_library.install_aliases() # noqa 

from builtins import range 

from builtins import str as newstr 

 

import asynchat 

import asyncore 

import socket 

from http.server import SimpleHTTPRequestHandler as SHRH 

import sys 

import html 

import json 

import cgi 

from io import BytesIO 

import io 

import os 

import traceback 

import posixpath 

import urllib.request 

import urllib.parse 

import urllib.error 

import re 

from collections import deque 

import logging 

 

import matplotlib 

matplotlib.use('Agg') # noqa 

 

import matplotlib.pyplot as plt 

from pyrocko.plot import cake_plot 

from pyrocko import gf, util 

 

 

logger = logging.getLogger('pyrocko.gf.server') 

 

__version__ = '1.0' 

 

store_id_pattern = gf.StringID.pattern[1:-1] 

 

 

def enc(s): 

try: 

return s.encode('utf-8') 

except Exception: 

return s 

 

 

def popall(self): 

# Preallocate the list to save memory resizing. 

r = len(self)*[None] 

for i in range(len(r)): 

r[i] = self.popleft() 

return r 

 

 

class writewrapper(object): 

def __init__(self, d, blocksize=4096): 

self.blocksize = blocksize 

self.d = d 

 

def write(self, data): 

if self.blocksize in (None, -1): 

self.d.append(data) 

else: 

BS = self.blocksize 

xtra = 0 

if len(data) % BS: 

xtra = len(data) % BS + BS 

buf = self.d 

for i in range(0, len(data)-xtra, BS): 

buf.append(data[i:i+BS]) 

if xtra: 

buf.append(data[-xtra:]) 

 

 

class RequestHandler(asynchat.async_chat, SHRH): 

 

server_version = 'Seismosizer/'+__version__ 

protocol_version = 'HTTP/1.1' 

blocksize = 4096 

 

# In enabling the use of buffer objects by setting use_buffer to True, 

# any data block sent will remain in memory until it has actually been 

# sent. 

use_buffer = False 

 

def __init__(self, conn, addr, server): 

asynchat.async_chat.__init__(self, conn) 

self.client_address = addr 

self.connection = conn 

self.server = server 

self.opened = [] 

# set the terminator : when it is received, this means that the 

# http request is complete ; control will be passed to 

# self.found_terminator 

self.set_terminator(b'\r\n\r\n') 

self.incoming = deque() 

self.outgoing = deque() 

self.rfile = None 

self.wfile = writewrapper( 

self.outgoing, 

-self.use_buffer or self.blocksize) 

self.found_terminator = self.handle_request_line 

self.request_version = "HTTP/1.1" 

self.code = None 

# buffer the response and headers to avoid several calls to select() 

 

def update_b(self, fsize): 

if fsize > 1048576: 

self.use_buffer = True 

self.blocksize = 131072 

 

def collect_incoming_data(self, data): 

"""Collect the data arriving on the connexion""" 

if not data: 

self.ac_in_buffer = "" 

return 

self.incoming.append(data) 

 

def prepare_POST(self): 

"""Prepare to read the request body""" 

bytesToRead = int(self.headers.getheader('Content-length')) 

# set terminator to length (will read bytesToRead bytes) 

self.set_terminator(bytesToRead) 

self.incoming.clear() 

# control will be passed to a new found_terminator 

self.found_terminator = self.handle_post_data 

 

def handle_post_data(self): 

"""Called when a POST request body has been read""" 

self.rfile = BytesIO(b''.join(popall(self.incoming))) 

self.rfile.seek(0) 

self.do_POST() 

 

def parse_request_url(self): 

# Check for query string in URL 

qspos = self.path.find('?') 

if qspos >= 0: 

self.body = cgi.parse_qs(self.path[qspos+1:], keep_blank_values=1) 

self.path = self.path[:qspos] 

else: 

self.body = {} 

 

def do_HEAD(self): 

"""Begins serving a HEAD request""" 

self.parse_request_url() 

f = self.send_head() 

if f: 

f.close() 

self.log_request(self.code) 

 

def do_GET(self): 

"""Begins serving a GET request""" 

self.parse_request_url() 

self.handle_data() 

 

def do_POST(self): 

"""Begins serving a POST request. The request data must be readable 

on a file-like object called self.rfile""" 

ctype, pdict = cgi.parse_header(self.headers.getheader('content-type')) 

length = int(self.headers.getheader('content-length')) 

if ctype == 'multipart/form-data': 

self.body = cgi.parse_multipart(self.rfile, pdict) 

elif ctype == 'application/x-www-form-urlencoded': 

qs = self.rfile.read(length) 

self.body = cgi.parse_qs(qs, keep_blank_values=1) 

else: 

self.body = {} 

# self.handle_post_body() 

self.handle_data() 

 

def handle_close(self): 

for f in self.opened: 

if not f.closed: 

f.close() 

asynchat.async_chat.handle_close(self) 

 

def handle_data(self): 

"""Class to override""" 

 

f = self.send_head() 

if f: 

# do some special things with file objects so that we don't have 

# to read them all into memory at the same time...may leave a 

# file handle open for longer than is really desired, but it does 

# make it able to handle files of unlimited size. 

try: 

size = sys.getsizeof(f) 

except (AttributeError, io.UnsupportedOperation): 

size = len(f.getvalue()) 

 

self.update_b(size) 

self.log_request(self.code, size) 

self.outgoing.append(f) 

else: 

self.log_request(self.code) 

# signal the end of this request 

self.outgoing.append(None) 

 

def handle_request_line(self): 

"""Called when the http request line and headers have been received""" 

# prepare attributes needed in parse_request() 

self.rfile = BytesIO(b''.join(popall(self.incoming))) 

self.rfile.seek(0) 

self.raw_requestline = self.rfile.readline() 

self.parse_request() 

 

if self.command in ['GET', 'HEAD']: 

# if method is GET or HEAD, call do_GET or do_HEAD and finish 

method = "do_"+self.command 

if hasattr(self, method): 

getattr(self, method)() 

elif self.command == "POST": 

# if method is POST, call prepare_POST, don't finish yet 

self.prepare_POST() 

else: 

self.send_error(501, "Unsupported method (%s)" % self.command) 

 

def handle_error(self): 

traceback.print_exc(sys.stderr) 

self.close() 

 

def writable(self): 

return len(self.outgoing) and self.connected 

 

def handle_write(self): 

out = self.outgoing 

while len(out): 

a = out.popleft() 

 

a = enc(a) 

# handle end of request disconnection 

if a is None: 

# Some clients have issues with keep-alive connections, or 

# perhaps I implemented them wrong. 

 

# If the user is running a Python version < 2.4.1, there is a 

# bug with SimpleHTTPServer: 

# http://python.org/sf/1097597 

# So we should be closing anyways, even though the client will 

# claim a partial download, so as to prevent hung-connections. 

# if self.close_connection: 

self.close() 

return 

 

# handle file objects 

elif hasattr(a, 'read'): 

_a, a = a, a.read(self.blocksize) 

if not len(a): 

_a.close() 

del _a 

continue 

else: 

out.appendleft(_a) # noqa 

break 

 

# handle string/buffer objects 

elif len(a): 

break 

else: 

# if we get here, the outgoing deque is empty 

return 

 

# if we get here, 'a' is a string or buffer object of length > 0 

try: 

num_sent = self.send(a) 

if num_sent < len(a): 

if not num_sent: 

# this is probably overkill, but it can save the 

# allocations of buffers when they are enabled 

out.appendleft(a) 

elif self.use_buffer: 

out.appendleft(buffer(a, num_sent)) # noqa 

else: 

out.appendleft(a[num_sent:]) 

 

except socket.error as why: 

if isinstance(why, newstr): 

self.log_error(why) 

elif isinstance(why, tuple) and isinstance(why[-1], newstr): 

self.log_error(why[-1]) 

else: 

self.log_error(str(why)) 

self.handle_error() 

 

def log(self, message): 

self.log_info(message) 

 

def log_info(self, message, type='info'): 

{ 

'debug': logger.debug, 

'info': logger.info, 

'warning': logger.warning, 

'error': logger.error 

}.get(type, logger.info)(str(message)) 

 

def log_message(self, format, *args): 

self.log_info("%s - - [%s] %s \"%s\" \"%s\"\n" % ( 

self.address_string(), 

self.log_date_time_string(), 

format % args, 

self.headers.get('referer', ''), 

self.headers.get('user-agent', ''))) 

 

def listdir(self, path): 

return os.listdir(path) 

 

def list_directory(self, path): 

"""Helper to produce a directory listing (absent index.html). 

 

Return value is either a file object, or None (indicating an 

error). In either case, the headers are sent, making the 

interface the same as for send_head(). 

 

""" 

try: 

list = self.listdir(path) 

except os.error: 

self.send_error(404, "No permission to list directory") 

return None 

 

list.sort(key=lambda a: a.lower()) 

f = BytesIO() 

displaypath = html.escape(urllib.parse.unquote(self.path)) 

f.write(enc('<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">')) 

f.write(enc("<html>\n<title>Directory listing for %s</title>\n" 

% displaypath)) 

f.write( 

enc("<body>\n<h2>Directory listing for %s</h2>\n" % displaypath)) 

f.write(enc("<hr>\n<ul>\n")) 

for name in list: 

fullname = os.path.join(path, name) 

displayname = linkname = name 

# Append / for directories or @ for symbolic links 

if os.path.isdir(fullname): 

displayname = name + "/" 

linkname = name + "/" 

if os.path.islink(fullname): 

displayname = name + "@" 

# Note: a link to a directory displays with @ and links with / 

f.write(enc('<li><a href="%s">%s</a>\n' % 

(urllib.parse.quote(linkname), 

html.escape(displayname)))) 

f.write(enc("</ul>\n<hr>\n</body>\n</html>\n")) 

length = f.tell() 

f.seek(0) 

encoding = sys.getfilesystemencoding() 

 

self.send_response(200, 'OK') 

self.send_header("Content-Length", str(length)) 

self.send_header("Content-Type", "text/html; charset=%s" % encoding) 

self.end_headers() 

 

return f 

 

def redirect(self, path): 

self.send_response(301) 

self.send_header("Location", path) 

self.end_headers() 

 

def send_head(self): 

"""Common code for GET and HEAD commands. 

 

This sends the response code and MIME headers. 

 

Return value is either a file object (which has to be copied 

to the outputfile by the caller unless the command was HEAD, 

and must be closed by the caller under all circumstances), or 

None, in which case the caller has nothing further to do. 

 

""" 

path = self.translate_path(self.path) 

if path is None: 

self.send_error(404, "File not found") 

return None 

 

f = None 

if os.path.isdir(path): 

if not self.path.endswith('/'): 

# redirect browser - doing basically what apache does 

return self.redirect(self.path + '/') 

else: 

return self.list_directory(path) 

 

ctype = self.guess_type(path) 

try: 

# Always read in binary mode. Opening files in text mode may cause 

# newline translations, making the actual size of the content 

# transmitted *less* than the content-length! 

f = open(path, 'rb') 

self.opened.append(f) 

except IOError: 

self.send_error(404, "File not found") 

return None 

fs = os.fstat(f.fileno()) 

self.send_response(200, "OK") 

self.send_header("Last-Modified", self.date_time_string(fs.st_mtime)) 

self.send_header("Content-Length", str(fs[6])) 

self.send_header("Content-Type", ctype) 

self.send_header("Content-Disposition", "attachment") 

self.end_headers() 

return f 

 

 

class SeismosizerHandler(RequestHandler): 

 

stores_path = '/gfws/static/stores/' 

api_path = '/gfws/api/' 

process_path = '/gfws/seismosizer/1/query' 

 

def send_head(self): 

S = self.stores_path 

P = self.process_path 

A = self.api_path 

for x in (S,): 

if re.match(r'^' + x[:-1] + '$', self.path): 

return self.redirect(x) 

 

if re.match(r'^' + S + store_id_pattern, self.path): 

return RequestHandler.send_head(self) 

 

elif re.match(r'^' + S + '$', self.path): 

return self.list_stores() 

 

elif re.match(r'^' + A + '$', self.path): 

return self.list_stores_json() 

 

elif re.match(r'^' + A + store_id_pattern + '$', self.path): 

return self.get_store_config() 

 

elif re.match(r'^' + A + store_id_pattern + '/profile$', self.path): 

return self.get_store_velocity_profile() 

 

elif re.match(r'^' + P + '$', self.path): 

return self.process() 

 

else: 

self.send_error(404, "File not found") 

self.end_headers() 

return None 

 

def translate_path(self, path): 

path = path.split('?', 1)[0] 

path = path.split('#', 1)[0] 

path = posixpath.normpath(urllib.parse.unquote(path)) 

words = path.split('/') 

words = [_f for _f in words if _f] 

 

path = '/' 

if words[:3] == self.stores_path.split('/')[1:-1] and len(words) > 3: 

engine = self.server.engine 

if words[3] not in engine.get_store_ids(): 

return None 

else: 

path = engine.get_store_dir(words[3]) 

words = words[4:] 

else: 

return None 

 

for word in words: 

drive, word = os.path.splitdrive(word) 

head, word = os.path.split(word) 

if word in (os.curdir, os.pardir): 

continue 

path = os.path.join(path, word) 

 

return path 

 

def listdir(self, path): 

if path == self.stores_path: 

return list(self.server.engine.get_store_ids()) 

else: 

return RequestHandler.listdir(self, path) 

 

def list_stores(self): 

'''Create listing of stores.''' 

from jinja2 import Template 

 

engine = self.server.engine 

 

store_ids = list(engine.get_store_ids()) 

store_ids.sort(key=lambda x: x.lower()) 

 

stores = [engine.get_store(store_id) for store_id in store_ids] 

 

templates = { 

'html': Template(''' 

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> 

<html> 

<title>{{ title }}</title> 

<body> 

<h2>{{ title }}</h2> 

<hr> 

<table> 

<tr> 

<th style="text-align:left">Store ID</th> 

<th style="text-align:center">Type</th> 

<th style="text-align:center">Extent</th> 

<th style="text-align:center">Sample-rate</th> 

<th style="text-align:center">Size (index + traces)</th> 

</tr> 

{% for store in stores %} 

<tr> 

<td><a href="{{ store.config.id }}/">{{ store.config.id|e }}/</a></td> 

<td style="text-align:center">{{ store.config.short_type }}</td> 

<td style="text-align:right">{{ store.config.short_extent }} km</td> 

<td style="text-align:right">{{ store.config.sample_rate }} Hz</td> 

<td style="text-align:right">{{ store.size_index_and_data_human }}</td> 

</tr> 

{% endfor %} 

</table> 

</hr> 

</body> 

</html> 

'''.lstrip()), 

'text': Template(''' 

{% for store in stores %}{# 

#}{{ store.config.id.ljust(25) }} {# 

#}{{ store.config.short_type.center(5) }} {# 

#}{{ store.config.short_extent.rjust(30) }} km {# 

#}{{ "%10.2g"|format(store.config.sample_rate) }} Hz {# 

#}{{ store.size_index_and_data_human.rjust(8) }} 

{% endfor %}'''.lstrip())} 

 

format = self.body.get('format', ['html'])[0] 

if format not in ('html', 'text'): 

format = 'html' 

 

title = "Green's function stores listing" 

s = templates[format].render(stores=stores, title=title).encode('utf8') 

length = len(s) 

f = BytesIO(s) 

self.send_response(200, 'OK') 

self.send_header("Content-Type", "text/html; charset=utf-8") 

self.send_header("Content-Length", str(length)) 

self.end_headers() 

return f 

 

def list_stores_json(self): 

engine = self.server.engine 

 

store_ids = list(engine.get_store_ids()) 

store_ids.sort(key=lambda x: x.lower()) 

 

def get_store_dict(store): 

store.ensure_reference() 

 

return { 

'id': store.config.id, 

'short_type': store.config.short_type, 

'modelling_code_id': store.config.modelling_code_id, 

'source_depth_min': store.config.source_depth_min, 

'source_depth_max': store.config.source_depth_max, 

'source_depth_delta': store.config.source_depth_delta, 

'distance_min': store.config.distance_min, 

'distance_max': store.config.distance_max, 

'distance_delta': store.config.distance_delta, 

'sample_rate': store.config.sample_rate, 

'size': store.size_index_and_data, 

'uuid': store.config.uuid, 

'reference': store.config.reference 

} 

 

stores = { 

'stores': [get_store_dict(engine.get_store(store_id)) 

for store_id in store_ids] 

} 

 

s = json.dumps(stores) 

length = len(s) 

f = BytesIO(s.encode('ascii')) 

self.send_response(200, 'OK') 

self.send_header("Content-Type", "text/html; charset=utf-8") 

self.send_header("Content-Length", str(length)) 

self.send_header("Access-Control-Allow-Origin", '*') 

self.end_headers() 

 

return f 

 

def get_store_config(self): 

engine = self.server.engine 

 

store_ids = list(engine.get_store_ids()) 

store_ids.sort(key=lambda x: x.lower()) 

 

for match in re.finditer(r'/gfws/api/(' + store_id_pattern + ')', 

self.path): 

store_id = match.groups()[0] 

 

try: 

store = engine.get_store(store_id) 

except Exception: 

self.send_error(404) 

self.end_headers() 

return 

 

data = {} 

data['id'] = store_id 

data['config'] = str(store.config) 

 

s = json.dumps(data) 

length = len(s) 

f = BytesIO(s.encode('ascii')) 

self.send_response(200, 'OK') 

self.send_header("Content-Type", "text/html; charset=utf-8") 

self.send_header("Content-Length", str(length)) 

self.send_header("Access-Control-Allow-Origin", '*') 

self.end_headers() 

 

return f 

 

def get_store_velocity_profile(self): 

engine = self.server.engine 

 

fig = plt.figure() 

axes = fig.gca() 

 

store_ids = list(engine.get_store_ids()) 

store_ids.sort(key=lambda x: x.lower()) 

 

for match in re.finditer( 

r'/gfws/api/(' + store_id_pattern + ')/profile', self.path): 

store_id = match.groups()[0] 

 

try: 

store = engine.get_store(store_id) 

except Exception: 

self.send_error(404) 

self.end_headers() 

return 

 

cake_plot.my_model_plot(store.config.earthmodel_1d, axes=axes) 

 

f = BytesIO() 

fig.savefig(f, format='png') 

 

length = f.tell() 

self.send_response(200, 'OK') 

self.send_header("Content-Type", "image/png;") 

self.send_header("Content-Length", str(length)) 

self.send_header("Access-Control-Allow-Origin", '*') 

self.end_headers() 

 

f.seek(0) 

return f.read() 

 

def process(self): 

 

request = gf.load(string=self.body['request'][0]) 

try: 

resp = self.server.engine.process(request=request) 

except (gf.BadRequest, gf.StoreError) as e: 

self.send_error(400, str(e)) 

return 

 

f = BytesIO() 

resp.dump(stream=f) 

length = f.tell() 

 

f.seek(0) 

 

self.send_response(200, 'OK') 

self.send_header("Content-Type", "text/html; charset=utf-8") 

self.send_header("Content-Length", str(length)) 

self.end_headers() 

return f 

 

def guess_type(self, path): 

bn = os.path.basename 

dn = os.path.dirname 

if bn(path) == 'config': 

return 'text/plain' 

 

if bn(dn(path)) == 'extra': 

return 'text/plain' 

 

else: 

return RequestHandler.guess_type(self, path) \ 

or 'application/x-octet' 

 

 

class Server(asyncore.dispatcher): 

def __init__(self, ip, port, handler, engine): 

self.ensure_uuids(engine) 

logger.info('starting Server at http://%s:%d', ip, port) 

 

asyncore.dispatcher.__init__(self) 

self.ip = ip 

self.port = port 

self.handler = handler 

asyncore.dispatcher.__init__(self) 

self.create_socket(socket.AF_INET, socket.SOCK_STREAM) 

 

self.set_reuse_addr() 

self.bind((ip, port)) 

self.engine = engine 

 

# Quoting the socket module documentation... 

# listen(backlog) 

# Listen for connections made to the socket. The backlog argument 

# specifies the maximum number of queued connections and should 

# be at least 1; the maximum value is system-dependent (usually 

# 5). 

self.listen(5) 

 

@staticmethod 

def ensure_uuids(engine): 

logger.info('ensuring UUIDs of available stores') 

store_ids = list(engine.get_store_ids()) 

for store_id in store_ids: 

store = engine.get_store(store_id) 

store.ensure_reference() 

 

def handle_accept(self): 

try: 

conn, addr = self.accept() 

except socket.error: 

self.log_info('warning: server accept() threw an exception', 

'warning') 

return 

except TypeError: 

self.log_info('warning: server accept() threw EWOULDBLOCK', 

'warning') 

return 

 

self.handler(conn, addr, self) 

 

def log(self, message): 

self.log_info(message) 

 

def handle_close(self): 

self.close() 

 

def log_info(self, message, type='info'): 

{ 

'debug': logger.debug, 

'info': logger.info, 

'warning': logger.warning, 

'error': logger.error 

}.get(type, 'info')(str(message)) 

 

 

def run(ip, port, engine): 

s = Server(ip, port, SeismosizerHandler, engine) 

asyncore.loop() 

del s 

 

 

if __name__ == '__main__': 

util.setup_logging('pyrocko.gf.server', 'info') 

port = 8085 

engine = gf.LocalEngine(store_superdirs=sys.argv[1:]) 

run('127.0.0.1', port, engine)