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58 lines
2.5 KiB
Python
58 lines
2.5 KiB
Python
#-*- coding: utf-8 -*-
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import StringIO
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import gzip
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import requests
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import subprocess
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from tempfile import NamedTemporaryFile
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class HDFSApi(object):
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def __init__(self, user):
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self.host = "localhost"
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self.http_proxy_port = "50070"
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self.http_data_port = "50075"
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self.user = user
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def read_data(self, path):
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response = requests.get("http://{host}:{port}/webhdfs/v1{path}?op=OPEN".format(host=self.host, port=self.http_proxy_port, path=path), allow_redirects=False)
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if response.status_code != 307:
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response.raise_for_status()
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additional_params = '&'.join(response.headers['Location'].split('&')[1:2])
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response_data = requests.get("http://{host}:{port}/webhdfs/v1{path}?op=OPEN&{params}".format(host=self.host, port=self.http_data_port, path=path, params=additional_params))
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if response_data.status_code != 200:
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response_data.raise_for_status()
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return response_data.content
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# Requests can't put file
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def _curl_to_put(self, filename, path, params):
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url = "http://{host}:{port}/webhdfs/v1{path}?op=CREATE&{params}".format(host=self.host, port=self.http_data_port, path=path, params=params)
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cmd = "curl -s -i -X PUT -T {fname} '{url}'".format(fname=filename, url=url)
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output = subprocess.check_output(cmd, shell=True)
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return output
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def write_data(self, path, content):
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named_file = NamedTemporaryFile()
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fpath = named_file.name
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named_file.write(content)
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named_file.flush()
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response = requests.put(
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"http://{host}:{port}/webhdfs/v1{path}?op=CREATE".format(host=self.host, port=self.http_proxy_port, path=path, user=self.user),
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allow_redirects=False
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)
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if response.status_code != 307:
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response.raise_for_status()
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additional_params = '&'.join(response.headers['Location'].split('&')[1:2] + ["user.name={}".format(self.user), "overwrite=true"])
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output = self._curl_to_put(fpath, path, additional_params)
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if "201 Created" not in output:
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raise Exception("Can't create file on hdfs:\n {}".format(output))
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def write_gzip_data(self, path, content):
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out = StringIO.StringIO()
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with gzip.GzipFile(fileobj=out, mode="w") as f:
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f.write(content)
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self.write_data(path, out.getvalue())
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def read_gzip_data(self, path):
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return gzip.GzipFile(fileobj=StringIO.StringIO(self.read_data(path))).read()
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