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138 lines
4.0 KiB
Python
138 lines
4.0 KiB
Python
"""
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Primitive replacement for requests to avoid extra dependency.
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Avoids use of urllib2 due to lack of SNI support.
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"""
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from __future__ import annotations
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import json
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import time
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import typing as t
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from .util import (
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ApplicationError,
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SubprocessError,
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display,
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)
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from .util_common import (
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CommonConfig,
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run_command,
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)
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class HttpClient:
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"""Make HTTP requests via curl."""
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def __init__(self, args: CommonConfig, always: bool = False, insecure: bool = False, proxy: t.Optional[str] = None) -> None:
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self.args = args
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self.always = always
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self.insecure = insecure
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self.proxy = proxy
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self.username = None
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self.password = None
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def get(self, url: str) -> HttpResponse:
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"""Perform an HTTP GET and return the response."""
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return self.request('GET', url)
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def delete(self, url: str) -> HttpResponse:
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"""Perform an HTTP DELETE and return the response."""
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return self.request('DELETE', url)
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def put(self, url: str, data: t.Optional[str] = None, headers: t.Optional[dict[str, str]] = None) -> HttpResponse:
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"""Perform an HTTP PUT and return the response."""
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return self.request('PUT', url, data, headers)
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def request(self, method: str, url: str, data: t.Optional[str] = None, headers: t.Optional[dict[str, str]] = None) -> HttpResponse:
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"""Perform an HTTP request and return the response."""
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cmd = ['curl', '-s', '-S', '-i', '-X', method]
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if self.insecure:
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cmd += ['--insecure']
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if headers is None:
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headers = {}
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headers['Expect'] = '' # don't send expect continue header
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if self.username:
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if self.password:
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display.sensitive.add(self.password)
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cmd += ['-u', '%s:%s' % (self.username, self.password)]
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else:
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cmd += ['-u', self.username]
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for header in headers.keys():
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cmd += ['-H', '%s: %s' % (header, headers[header])]
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if data is not None:
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cmd += ['-d', data]
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if self.proxy:
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cmd += ['-x', self.proxy]
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cmd += [url]
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attempts = 0
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max_attempts = 3
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sleep_seconds = 3
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# curl error codes which are safe to retry (request never sent to server)
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retry_on_status = (
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6, # CURLE_COULDNT_RESOLVE_HOST
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)
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stdout = ''
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while True:
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attempts += 1
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try:
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stdout = run_command(self.args, cmd, capture=True, always=self.always, cmd_verbosity=2)[0]
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break
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except SubprocessError as ex:
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if ex.status in retry_on_status and attempts < max_attempts:
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display.warning('%s' % ex)
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time.sleep(sleep_seconds)
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continue
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raise
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if self.args.explain and not self.always:
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return HttpResponse(method, url, 200, '')
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header, body = stdout.split('\r\n\r\n', 1)
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response_headers = header.split('\r\n')
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first_line = response_headers[0]
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http_response = first_line.split(' ')
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status_code = int(http_response[1])
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return HttpResponse(method, url, status_code, body)
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class HttpResponse:
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"""HTTP response from curl."""
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def __init__(self, method: str, url: str, status_code: int, response: str) -> None:
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self.method = method
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self.url = url
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self.status_code = status_code
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self.response = response
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def json(self) -> t.Any:
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"""Return the response parsed as JSON, raising an exception if parsing fails."""
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try:
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return json.loads(self.response)
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except ValueError:
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raise HttpError(self.status_code, 'Cannot parse response to %s %s as JSON:\n%s' % (self.method, self.url, self.response)) from None
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class HttpError(ApplicationError):
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"""HTTP response as an error."""
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def __init__(self, status: int, message: str) -> None:
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super().__init__('%s: %s' % (status, message))
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self.status = status
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