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pdfmaster.py
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pdfmaster.py
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from ctypes import *
import os
import platform
import redis
import json
import sys, getopt
import tempfile
SCRIPT_PATH = os.path.dirname(os.path.abspath(__file__))
PDF_PLATFORM_LIB = SCRIPT_PATH + "/pdfmaster/hare.dll"
platform_str = platform.system()
if (platform_str != "Windows"):
PDF_PLATFORM_LIB = SCRIPT_PATH + "/pdfmaster/libhare.so"
class MASTER_LIBRARY_EXCEPTION(Exception):
def __init__(self, *args: object) -> None:
super().__init__(*args)
class TASK_EXCEPTION(Exception):
def __init__(self, *args: object) -> None:
super().__init__(*args)
class pdfmaster(object):
def __init__(self, pdf_dll_path=PDF_PLATFORM_LIB):
self.pdf_obj = None
if not pdf_dll_path:
raise MASTER_LIBRARY_EXCEPTION()
self.pdf_obj = CDLL(pdf_dll_path)
if not self.pdf_obj:
raise MASTER_LIBRARY_EXCEPTION()
self.convert_type = "pdfofd"
def new_engine(self, machine_code, lic_code, load_font = 1):
'''
'''
new_engine_fn = self.pdf_obj.hare_library_init
new_engine_fn.argtypes = [c_int, c_char_p, c_char_p]
return new_engine_fn(load_font, machine_code.encode(), lic_code.encode())
def pdf2ofd(self, pdf_path, ofd_path, page_range = "1-N"):
pdf2ofd_fn = self.pdf_obj.hare_library_pdf2ofd
pdf2ofd_fn.restype = c_long
pdf2ofd_fn.argtypes = [c_char_p, c_char_p, c_char_p]
return pdf2ofd_fn(pdf_path.encode(), ofd_path.encode(), page_range.encode())
def ofd2pdf(self, ofd_path, pdf_path, page_range="1-N"):
ofd2pdf_fn = self.pdf_obj.hare_library_ofd2pdf
ofd2pdf_fn.restype = c_long
ofd2pdf_fn.argtypes = [c_char_p, c_char_p, c_char_p, c_char_p]
with tempfile.TemporaryDirectory() as tmpdirname:
lret = ofd2pdf_fn(ofd_path.encode(), pdf_path.encode(), page_range.encode(), tmpdirname.encode())
return lret
def get_convert_type(self):
return self.convert_type
class Convertor(object):
def __init__(self):
config_obj = self.read_config()
self.engine = pdfmaster()
#import pdb
#pdb.set_trace()
lic_path = os.path.join(SCRIPT_PATH, 'officemaster.lic')
if not os.path.exists(lic_path):
print("****There are no license file:" + lic_path)
raise MASTER_LIBRARY_EXCEPTION()
license_code=None
with open(lic_path, 'r') as f:
license_code = f.read()
self.engine.new_engine(machine_code="", lic_code=license_code)
self.convert_type = self.engine.get_convert_type()
self.dump2screen = False
if config_obj["log_level"] <= 1:
self.dump2screen = True
self.r = redis.Redis(host=config_obj["redis_ip"], port=config_obj["redis_port"])
def read_config(self):
'''
read config.json
return json obj
'''
config_fpath = os.path.join(SCRIPT_PATH, "config.json")
default_config = {
"log_level":4,
"redis_ip":"localhost",
"redis_port":6379
}
try:
with open(config_fpath, 'rb') as f:
config_obj = json.load(f)
if 'redis_ip' not in config_obj:
config_obj["redis_ip"] = "localhost"
if 'redis_port' not in config_obj:
config_obj["redis_port"] = 6379
if 'log_level' not in config_obj:
config_obj["log_level"] = 4
except Exception as e:
print("read_config exception:", e)
config_obj = json.loads(default_config)
return config_obj
def printscreen(self, msg):
if self.dump2screen:
print(msg)
def keep_alive(self, task=None):
'''
子进程保活机制：
子进程创建名为 subprocess:xxx的redis键， xxx为子进程pid
subprocess:xxx键的值为一个json,
{
"timestamp":以 UNIX 时间戳格式表示, redis Time
"pid":进程本身的pid
"type": "word", "excel","powerpoint", "pdfofd"...
"officepid":officemaster控制下的office子进程id
}
'''
time = self.r.time()
v = {
"timestamp":time[0],
"pid":os.getpid(),
"type":self.convert_type
}
if task:
v["task"] = task["task_key"]
v["task_timeout"] = task["task_timeout"]
self.r.set("subprocess:"+str(os.getpid()), json.dumps(v))
def workloop(self):
while True:
try:
task = self.r.blpop("Convert:"+self.convert_type, 60)
if not task:
self.keep_alive()
continue
self.printscreen(str(task))
if b"STOPMONITOR" == task[1]:
self.engine.logging("received STOPMONITOR,exit")
break
task_obj = json.loads(task[1])
if "file_path" not in task_obj:
raise TASK_EXCEPTION("no file_path in task_obj")
if "task_key" not in task_obj:
raise TASK_EXCEPTION("no task_key in task_obj")
if "target_path" not in task_obj:
raise TASK_EXCEPTION("no target_path in task_obj")
if not os.path.exists(task_obj["file_path"]):
raise TASK_EXCEPTION("file not found:" + task_obj["file_path"])
if "task_inqueue_time" in task_obj:
#有任务入队时间
if "task_inqueue_timeout" in task_obj:
now = self.r.time()
now = now[0]
diff = now - task_obj["task_inqueue_time"]
if diff > task_obj["task_inqueue_timeout"]:
self.engine.logging("task:"+ task_obj["task_key"]+ "reached inqueue timeout, ignored it", 2)
self.keep_alive()
continue
if "task_timeout" not in task_obj:
task_obj["task_timeout"] = 60
#TODO
#检查源文件类型是否与队列支持的类型相匹配，以防止错误的转换
target_dir = os.path.abspath(os.path.dirname(task_obj["target_path"]))
if not os.path.exists(target_dir):
os.makedirs(target_dir)
#标记任务开始时间
self.keep_alive(task_obj)
if task_obj["file_path"].endswith(".pdf"):
ret = self.engine.pdf2ofd(task_obj["file_path"], task_obj["target_path"])
elif task_obj["file_path"].endswith(".ofd"):
ret = self.engine.ofd2pdf(task_obj["file_path"], task_obj["target_path"])
else:
continue
#self.r.setnx("ConvertResult:" + task_obj["task_key"], ret)
#形成一个"ConvertResult:" + task_obj["task_key"] 的队列，此队列用于结果发送
#队列的key设置了60s自动删除
#任务消费者负责将结果rpush进去，
#任务生产者可以在此队列上blpop等待，等待的时长，可以是
#task_inqueue_timeout任务在队列中的超时时长加上task_timeout任务转换时长，默认180s
self.r.rpush("ConvertResult:" + task_obj["task_key"], str(ret))
self.r.expire("ConvertResult:" + task_obj["task_key"], 60)
#self.printscreen("task:" + task_obj["task_key"] + " result :" + str(self.r.get("ConvertResult:" + task_obj["task_key"])))
self.printscreen("task:"+ task_obj["file_path"]+ " result->:" + str(ret))
self.keep_alive()
except Exception as e:
print("workloop",e)
if __name__ == '__main__':
convertor= Convertor()
print("\r\nstartup pdf/ofd convertor\r\n")
convertor.workloop()