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slave_sync_gs_preview.py
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import logging
import traceback
import math
import os
import sys
import requests
import json
import geoserver_catalog_extension
import slave_sync_env as settings
from slave_sync_task import (
update_feature_job,gs_spatial_task_filter,update_livelayer_job,layer_preview_task_filter,update_wmslayer_job
)
logger = logging.getLogger(__name__)
australia_bbox = (108.0000,-45.0000,155.0000,-10.0000)
preview_dimension = (480,278)
def get_preview_dimension(bbox):
if isinstance(bbox,basestring):
bbox = json.loads(bbox)
bbox_ratio = [(bbox[2] - bbox[0]) / (australia_bbox[2] - australia_bbox[0]),(bbox[3] - bbox[1]) / (australia_bbox[3] - australia_bbox[1])]
if (bbox_ratio[0] > bbox_ratio[1]):
return (preview_dimension[0],int(math.floor(preview_dimension[1] * (bbox_ratio[1] / bbox_ratio[0]))))
else:
return (int(math.floor(preview_dimension[0] * bbox_ratio[0] * (1 / bbox_ratio[1]))),preview_dimension[1])
task_layer_name = lambda sync_job: "{0}:{1}".format(sync_job['workspace'],sync_job['name'])
base_preview_url = lambda geoserver_url:geoserver_url + "/ows?service=wms&version=1.1.0&request=GetMap&srs=EPSG%3A4326&format=image/png"
def layer_preview_urls(sync_job,geoserver_url):
urls = []
height = None
link = None
#get GWC supported url
if "ows_resource" in sync_job:
for resource in sync_job["ows_resource"]:
if resource["protocol"] == "OGC:WMS" and resource["link"]:
height = int(resource.get("height") or "0")
link = resource["link"]
#replace the kmi url with local url
link = geoserver_url + link[link.find("/geoserver") + len("/geoserver"):]
if resource["format"] == "image/jpeg":
urls.append((link,".jpg",height))
else:
urls.append((link,".{}".format(resource["format"][6:]),height))
urls.sort(key=lambda data:data[2])
#add GetMap url
bbox = sync_job.get("bbox") or australia_bbox
dimension = get_preview_dimension(bbox)
preview_url = base_preview_url(geoserver_url) + "&bbox=" + ",".join([str(d) for d in bbox]) + "&layers=" + "%3A".join([sync_job["workspace"],sync_job['name']]) + "&width=" + str(dimension[0]) + "&height=" + str(dimension[1])
urls.append( (preview_url,".png",-1))
return urls
def _get_layer_preview(sync_job,task_metadata,task_status):
logger.info("Try to get layer preview image")
urls = layer_preview_urls(sync_job,settings.GEOSERVER_URL[0])
index = 0
for url in urls:
index += 1
resp = requests.get(url[0], auth=(settings.GEOSERVER_USERNAME[0],settings.GEOSERVER_PASSWORD[0]))
if resp.status_code >= 400:
task_status.del_message("preview_file")
if index == len(urls):
raise Exception("Failed to get layer's preview image. ({0}: {1})".format(resp.status_code, resp.content))
else:
continue
elif not resp.headers['Content-Type'].startswith("image/"):
task_status.del_message("preview_file")
if resp.text.find("This request used more time than allowed") >= 0:
#processing timeout; next time, has high change to succeed becuare the map is prepared by previous request
if index == len(urls):
raise Exception("Get layer's preview image timeout.")
else:
continue
else:
if index == len(urls):
raise Exception("url:{}\r\n{}".format(url[0],resp.text))
else:
continue
#getmap succeed
try:
folder = os.path.join(settings.PREVIEW_ROOT_PATH,settings.SLAVE_NAME,sync_job["channel"],sync_job["workspace"])
if not os.path.exists(folder): os.makedirs(folder)
filename = os.path.join(folder,sync_job["name"] + url[1])
with open(filename, 'wb') as fd:
for chunk in resp.iter_content(1024):
fd.write(chunk)
task_status.set_message("preview_file",filename[len(settings.PREVIEW_ROOT_PATH) + 1:])
break
except:
raise Exception("Failed to get layer's preview image. {0}".format(resp.content))
def _get_layer_preview_with_dependent_geoservers(sync_job,task_metadata,task_status):
logger.info("Try to get layer preview image")
exceptions = []
for i in range(len(settings.GEOSERVER_URL)):
stagename = settings.GEOSERVER_HOST[i]
try:
if task_status.is_stage_not_succeed(stagename):
urls = layer_preview_urls(sync_job,geoserver_url=settings.GEOSERVER_URL[i])
index = 0
for url in urls:
index += 1
resp = requests.get(url[0], auth=(settings.GEOSERVER_USERNAME[i],settings.GEOSERVER_PASSWORD[i]))
if resp.status_code >= 400:
if index == len(urls):
raise Exception("Failed to get layer's preview image from '{2}'. ({0}: {1})".format(resp.status_code, resp.content,settings.GEOSERVER_HOST[i]))
else:
continue
elif not resp.headers['Content-Type'].startswith("image/"):
if resp.text.find("This request used more time than allowed") >= 0:
#processing timeout; next time, has high change to succeed becuare the map is prepared by previous request
if index == len(urls):
raise Exception("Get layer's preview image from '{}' timeout.".format(settings.GEOSERVER_HOST[i]))
else:
continue
else:
if index == len(urls):
raise Exception("{2}: url:{0}\r\n{1}".format(url[0],resp.text,settings.GEOSERVER_HOST[i]))
else:
continue
#getmap succeed
try:
folder = os.path.join(settings.PREVIEW_ROOT_PATH,settings.SLAVE_NAME,sync_job["channel"],sync_job["workspace"])
if not os.path.exists(folder): os.makedirs(folder)
if i == 0:
filename = os.path.join(folder,sync_job["name"] + url[1])
else:
filename = os.path.join(folder,"{0}-{2}{1}".format(sync_job["name"] ,url[1],settings.GEOSERVER_HOST[i]))
with open(filename, 'wb') as fd:
for chunk in resp.iter_content(1024):
fd.write(chunk)
task_status.set_stage_message(stagename,"preview_file",filename[len(settings.PREVIEW_ROOT_PATH) + 1:])
task_status.del_stage_message(stagename,"message")
task_status.stage_succeed(stagename)
if i == 0:
task_status.set_message("preview_file",filename[len(settings.PREVIEW_ROOT_PATH) + 1:])
break
except:
raise Exception("Failed to get layer's preview image from '{1}'. {0}".format(traceback.format_exc(),settings.GEOSERVER_HOST[i]))
except:
task_status.stage_failed(stagename)
task_status.del_stage_message(stagename,"preview_file")
task_status.set_stage_message(stagename,"message",str(sys.exc_info()[1]))
if i == 0:
task_status.del_message("preview_file")
exceptions.append(str(sys.exc_info()[1]))
if exceptions:
raise Exception("\n".join(exceptions))
elif task_status.all_stages_succeed:
task_status.clean_task_failed()
else:
task_status.task_failed()
if len(settings.GEOSERVER_URL) > 1:
get_layer_preview = _get_layer_preview_with_dependent_geoservers
else:
get_layer_preview = _get_layer_preview
tasks_metadata = [
("get_layer_preview", update_feature_job, layer_preview_task_filter , task_layer_name , get_layer_preview),
("get_layer_preview", update_livelayer_job, layer_preview_task_filter , task_layer_name , get_layer_preview),
("get_layer_preview", update_wmslayer_job, layer_preview_task_filter , task_layer_name , get_layer_preview),
]