├── .gitignore ├── .travis.yml ├── LICENSE ├── MANIFEST.in ├── Makefile ├── README.md ├── aioetcd ├── __init__.py └── client.py ├── examples └── simple_client.py ├── requirements.txt ├── requirements_test.txt ├── setup.cfg ├── setup.py └── tests └── test_client.py /.gitignore: -------------------------------------------------------------------------------- 1 | # Byte-compiled / optimized / DLL files 2 | __pycache__/ 3 | *.py[cod] 4 | 5 | # C extensions 6 | *.so 7 | 8 | # Distribution / packaging 9 | .Python 10 | env/ 11 | build/ 12 | develop-eggs/ 13 | dist/ 14 | downloads/ 15 | eggs/ 16 | lib/ 17 | lib64/ 18 | parts/ 19 | sdist/ 20 | var/ 21 | *.egg-info/ 22 | .installed.cfg 23 | *.egg 24 | 25 | # PyInstaller 26 | # Usually these files are written by a python script from a template 27 | # before PyInstaller builds the exe, so as to inject date/other infos into it. 28 | *.manifest 29 | *.spec 30 | 31 | # Installer logs 32 | pip-log.txt 33 | pip-delete-this-directory.txt 34 | 35 | # Unit test / coverage reports 36 | htmlcov/ 37 | .tox/ 38 | .coverage 39 | .cache 40 | nosetests.xml 41 | coverage.xml 42 | coverage/ 43 | 44 | # Translations 45 | *.mo 46 | *.pot 47 | 48 | # Django stuff: 49 | *.log 50 | 51 | # Sphinx documentation 52 | docs/_build/ 53 | 54 | # PyBuilder 55 | target/ 56 | 57 | # rope 58 | .ropeproject/ 59 | 60 | # vim 61 | *.sw[p|o|m] 62 | -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | language: python 2 | python: 3 | - "3.4" 4 | install: 5 | - pip install . 6 | - pip install -r requirements.txt 7 | - pip install -r requirements_test.txt 8 | - curl -L https://github.com/coreos/etcd/releases/download/v0.4.6/etcd-v0.4.6-linux-amd64.tar.gz -o etcd-v0.4.6-linux-amd64.tar.gz 9 | - tar xzvf etcd-v0.4.6-linux-amd64.tar.gz 10 | - export PATH=$PATH:$PWD/etcd-v0.4.6-linux-amd64 11 | script: make vtest 12 | 13 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU AFFERO GENERAL PUBLIC LICENSE 2 | Version 3, 19 November 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU Affero General Public License is a free, copyleft license for 11 | software and other kinds of works, specifically designed to ensure 12 | cooperation with the community in the case of network server software. 13 | 14 | The licenses for most software and other practical works are designed 15 | to take away your freedom to share and change the works. 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It is safest 628 | to attach them to the start of each source file to most effectively 629 | state the exclusion of warranty; and each file should have at least 630 | the "copyright" line and a pointer to where the full notice is found. 631 | 632 | 633 | Copyright (C) 634 | 635 | This program is free software: you can redistribute it and/or modify 636 | it under the terms of the GNU Affero General Public License as published 637 | by the Free Software Foundation, either version 3 of the License, or 638 | (at your option) any later version. 639 | 640 | This program is distributed in the hope that it will be useful, 641 | but WITHOUT ANY WARRANTY; without even the implied warranty of 642 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 643 | GNU Affero General Public License for more details. 644 | 645 | You should have received a copy of the GNU Affero General Public License 646 | along with this program. If not, see . 647 | 648 | Also add information on how to contact you by electronic and paper mail. 649 | 650 | If your software can interact with users remotely through a computer 651 | network, you should also make sure that it provides a way for users to 652 | get its source. For example, if your program is a web application, its 653 | interface could display a "Source" link that leads users to an archive 654 | of the code. There are many ways you could offer source, and different 655 | solutions will be better for different programs; see section 13 for the 656 | specific requirements. 657 | 658 | You should also get your employer (if you work as a programmer) or school, 659 | if any, to sign a "copyright disclaimer" for the program, if necessary. 660 | For more information on this, and how to apply and follow the GNU AGPL, see 661 | . 662 | 663 | -------------------------------------------------------------------------------- /MANIFEST.in: -------------------------------------------------------------------------------- 1 | recursive-include aioetcd * 2 | global-exclude *.pyc 3 | global-exclude *.swp 4 | global-exclude *.swo 5 | include VERSION README.md 6 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | # Some simple testing tasks (sorry, UNIX only). 2 | 3 | FLAGS= 4 | 5 | 6 | flake: 7 | flake8 aioetcd tests examples 8 | 9 | start_cluster: 10 | etcd -data-dir=tests.etcd -name=aioetcd_tests & 11 | sleep 1 12 | 13 | shut_cluster: 14 | kill -15 `pgrep -xf "etcd -data-dir=tests.etcd -name=aioetcd_tests"` || true 15 | rm -rf tests.etcd 16 | 17 | _test: 18 | nosetests -s $(FLAGS) ./tests/ 19 | 20 | _vtest: 21 | nosetests -s -v $(FLAGS) ./tests/ 22 | 23 | test: flake start_cluster _test shut_cluster 24 | 25 | vtest: flake start_cluster _vtest shut_cluster 26 | 27 | testloop: start_cluster 28 | while sleep 1; do python runtests.py $(FLAGS); done 29 | kill -15 `pgrep -xf "etcd -data-dir=tests.etcd -name=aioetcd_tests"` || true 30 | rm -rf tests.etcd 31 | 32 | _cov: 33 | nosetests -s --with-cover --cover-html --cover-branches --cover-html-dir ./coverage $(FLAGS) ./tests/ 34 | @echo "open file://`pwd`/coverage/index.html" 35 | 36 | cov cover coverage: start_cluster _cov shut_cluster 37 | 38 | clean: 39 | kill -15 `pgrep -xf "etcd -data-dir=tests.etcd -name=aioetcd_tests"` || true 40 | rm -rf `find . -name __pycache__` 41 | rm -f `find . -type f -name '*.py[co]' ` 42 | rm -f `find . -type f -name '*~' ` 43 | rm -f `find . -type f -name '.*~' ` 44 | rm -f `find . -type f -name '@*' ` 45 | rm -f `find . -type f -name '#*#' ` 46 | rm -f `find . -type f -name '*.orig' ` 47 | rm -f `find . -type f -name '*.rej' ` 48 | rm -f .coverage 49 | rm -rf coverage 50 | rm -rf build 51 | rm -rf cover 52 | rm -rf tests.etcd 53 | 54 | doc: 55 | make -C docs html 56 | @echo "open file://`pwd`/docs/_build/html/index.html" 57 | 58 | .PHONY: all build venv flake test vtest testloop cov clean doc start_cluster shut_cluster _test _vtest _cov 59 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | aioetcd 2 | ======= 3 | 4 | [![Build Status](https://travis-ci.org/lisael/aioetcd.svg?branch=master)](https://travis-ci.org/lisael/aioetcd) 5 | 6 | Coroutine-based etcd client 7 | 8 | Asyncio version of https://github.com/jplana/python-etcd 9 | 10 | ## Quick start 11 | 12 | Install etcd and etcdctl https://github.com/coreos/etcd/blob/master/README.md 13 | (TL;DR? Have a look at `install` section in .travis.yml) 14 | 15 | ``` 16 | virtualenv --python=python3.4 aioetcd 17 | cd aioetcd 18 | git clone https://github.com/lisael/aioetcd.git 19 | cd aioetcd 20 | make vtest # this runs and stops an etcd instance on default ports 4001 and 7001 21 | etcd & 22 | etcdctl set hop 42 23 | pip install . 24 | python3.4 example/simple_client.py 25 | ``` 26 | 27 | and in another terminal, run: 28 | 29 | ``` 30 | etcdctl set hello 0 # a couple of time and then 31 | etcdctl set hello 42 # as soon as it becomes boring 32 | etcdctl set hello 42 # or wait 5 seconds to unlock 33 | ``` 34 | 35 | (read the script to see what's going on) 36 | 37 | 38 | ## Project status 39 | 40 | At the moment, the project is still a toy, as it was not battle tested, but it's kind of a big boy's toy. I think it's mature enough to start using it in the real life, but use it carefully. You may have to fork it to fit your needs and expectations (PR, please!). 41 | 42 | ### Planed features 43 | 44 | 1. SSL client auth 45 | 2. chrooted client (add a directory key prefix to each request ) 46 | 3. <YOUR WANTED FEATURE HERE (and in an issue, please :) )> 47 | 48 | ### Known bugs 49 | 50 | 1. no known bugs 51 | (which means that the tests **are** buggy) 52 | 53 | ### Tests 54 | 55 | I didn't had time to write an etcd mock, so tests are only integration tests (it needs a working etcd on localhost). 56 | 57 | Coverage is about 60% (with emphasis on client.py, where all the gory details are) 58 | 59 | ## I want to help! What can I do? 60 | 61 | Play, fork, hack and, most important, have fun! 62 | -------------------------------------------------------------------------------- /aioetcd/__init__.py: -------------------------------------------------------------------------------- 1 | import asyncio 2 | 3 | 4 | class Node: 5 | _node_props = { 6 | 'key': None, 7 | 'value': None, 8 | 'expiration': None, 9 | 'ttl': None, 10 | 'modifiedIndex': None, 11 | 'createdIndex': None, 12 | '_prev_node': None 13 | } 14 | """Base class for etcd nodes. Cannot be instanciated""" 15 | def __new__(cls, **kwargs): 16 | # sometimes the write response of a dir is bogus, we have to check 17 | # the prevNode to be sure it's not a dir 18 | node = kwargs.get('node', {}) 19 | if node.pop("dir", False) or kwargs.get( 20 | "prevNode", {}).get("dir", False): 21 | return super(Node, cls).__new__(DirNode) 22 | else: 23 | return super(Node, cls).__new__(FileNode) 24 | 25 | def __init__(self, **kwargs): 26 | self.__dict__ = dict(self._node_props) 27 | self._update_from_dict(**kwargs) 28 | 29 | def _update_from_dict(self, **kwargs): 30 | node = kwargs.pop('node', {}) 31 | self._prev_node = kwargs.pop('prevNode', None) 32 | self.__dict__.update(kwargs) 33 | self.__dict__.update(node) 34 | 35 | @asyncio.coroutine 36 | def update(self): 37 | resp = yield from self.client._read_headers(self.key) 38 | params = yield from self.client._decode_response(resp) 39 | self._update_from_dict(**params) 40 | 41 | @property 42 | def prev_node(self): 43 | if isinstance(self._prev_node, dict): 44 | self._prev_node = Node(**self._prev_node) 45 | return self._prev_node 46 | 47 | @asyncio.coroutine 48 | def changed(self): 49 | params = dict(wait=True, waitIndex=self.modifiedIndex + 1) 50 | head = yield from self.client._read_headers(self.key, None, **params) 51 | content = head.content.read_nowait() 52 | head.close(force=True) 53 | return bool(content) 54 | 55 | 56 | class FileNode(Node): 57 | def __init__(self, **kwargs): 58 | super(FileNode, self).__init__(**kwargs) 59 | 60 | 61 | class DirNode(Node): 62 | def __new__(cls, **kwargs): 63 | kwargs['dir'] = True 64 | return super(Node, cls).__new__(DirNode, **kwargs) 65 | 66 | def __init__(self, **kwargs): 67 | super(DirNode, self).__init__(**kwargs) 68 | self._children = kwargs.get("nodes", []) 69 | 70 | def _update_from_dict(self, **kwargs): 71 | kwargs['_children'] = kwargs.pop('nodes', None) 72 | super(DirNode, self)._update_from_dict(**kwargs) 73 | 74 | def __iter__(self): 75 | for child in self._children: 76 | yield Node(child) 77 | 78 | @asyncio.coroutine 79 | def iter_children(self, update=False): 80 | if self._children is None: 81 | yield from self.update() 82 | elif update: 83 | changed = yield from self.changed() 84 | if changed: 85 | yield from self.update() 86 | return iter(self) 87 | 88 | 89 | class EtcdException(Exception): 90 | """ 91 | Generic Etcd Exception. 92 | """ 93 | pass 94 | 95 | 96 | class EtcdError: 97 | # See https://github.com/coreos/etcd/blob/master/Documentation/errorcode.md 98 | """ 99 | const ( 100 | EcodeKeyNotFound = 100 101 | EcodeTestFailed = 101 102 | EcodeNotFile = 102 103 | EcodeNoMorePeer = 103 104 | EcodeNotDir = 104 105 | EcodeNodeExist = 105 106 | EcodeKeyIsPreserved = 106 107 | EcodeRootROnly = 107 108 | 109 | EcodeValueRequired = 200 110 | EcodePrevValueRequired = 201 111 | EcodeTTLNaN = 202 112 | EcodeIndexNaN = 203 113 | 114 | EcodeRaftInternal = 300 115 | EcodeLeaderElect = 301 116 | 117 | EcodeWatcherCleared = 400 118 | EcodeEventIndexCleared = 401 119 | ) 120 | 121 | // command related errors 122 | errors[100] = "Key Not Found" 123 | errors[101] = "Test Failed" //test and set 124 | errors[102] = "Not A File" 125 | errors[103] = "Reached the max number of peers in the cluster" 126 | errors[104] = "Not A Directory" 127 | errors[105] = "Already exists" // create 128 | errors[106] = "The prefix of given key is a keyword in etcd" 129 | errors[107] = "Root is read only" 130 | 131 | // Post form related errors 132 | errors[200] = "Value is Required in POST form" 133 | errors[201] = "PrevValue is Required in POST form" 134 | errors[202] = "The given TTL in POST form is not a number" 135 | errors[203] = "The given index in POST form is not a number" 136 | 137 | // raft related errors 138 | errors[300] = "Raft Internal Error" 139 | errors[301] = "During Leader Election" 140 | 141 | // etcd related errors 142 | errors[400] = "watcher is cleared due to etcd recovery" 143 | errors[401] = "The event in requested index is outdated and cleared" 144 | """ 145 | 146 | error_exceptions = { 147 | 100: KeyError, 148 | 101: ValueError, 149 | 102: KeyError, 150 | 103: Exception, 151 | 104: KeyError, 152 | 105: KeyError, 153 | 106: KeyError, 154 | 200: ValueError, 155 | 201: ValueError, 156 | 202: ValueError, 157 | 203: ValueError, 158 | 300: Exception, 159 | 301: Exception, 160 | 400: Exception, 161 | 401: EtcdException, 162 | 500: EtcdException 163 | } 164 | 165 | @classmethod 166 | def handle(cls, errorCode=None, message=None, cause=None, **kwdargs): 167 | """ Decodes the error and throws the appropriate error message""" 168 | try: 169 | msg = "{} : {}".format(message, cause) 170 | exc = cls.error_exceptions[errorCode] 171 | except: 172 | msg = "Unable to decode server response" 173 | exc = EtcdException 174 | raise exc(msg) 175 | -------------------------------------------------------------------------------- /aioetcd/client.py: -------------------------------------------------------------------------------- 1 | import json 2 | import aiohttp 3 | import asyncio 4 | import aioetcd 5 | 6 | 7 | class Client: 8 | 9 | def __init__( 10 | self, 11 | host='127.0.0.1', 12 | port=4001, 13 | protocol='http', 14 | read_timeout=60, 15 | allow_redirect=True, 16 | allow_reconnect=False, 17 | loop=None, 18 | ): 19 | """ 20 | Initialize the client. 21 | 22 | :param host: (optional) If a string, IP to connect to. If a tuple 23 | ((host, port),(host, port), ...) of known etcd nodes 24 | :type host: str or tuple 25 | :param int port: (optional) Port used to connect to etcd. 26 | :param int read_timeout: (optional) max seconds to wait for a read. 27 | :param bool allow_redirect: (optional) allow the client to connect to 28 | other nodes. 29 | :param str protocol: (optional) Protocol used to connect to etcd. 30 | :param bool allow_reconnect: (optional) allow the client to reconnect 31 | to another etcd server in the cluster in the case the default one 32 | does not respond. 33 | :param loop: event loop to use internaly. If None, use 34 | asyncio.get_event_loop() 35 | """ 36 | self.loop = loop if loop is not None else asyncio.get_event_loop() 37 | 38 | def uri(host, port): 39 | return '%s://%s:%d' % (protocol, host, port) 40 | 41 | if isinstance(host, tuple): 42 | self._machines_cache = [uri(*conn) for conn in host] 43 | self._base_uri = self._machines_cache[0] 44 | else: 45 | self._base_uri = uri(host, port) 46 | self._machines_cache = [self._base_uri] 47 | 48 | self.read_timeout = read_timeout 49 | self.allow_redirect = allow_redirect 50 | self.allow_reconnect = allow_reconnect 51 | self._conn = aiohttp.TCPConnector() 52 | self._cache_update_scheduled = True 53 | self.loop.create_task(self._update_machine_cache()) 54 | 55 | # # high level operations 56 | 57 | @asyncio.coroutine 58 | def get(self, key): 59 | """ 60 | Returns the value of the key 'key'. Use Client.read for more 61 | control and to get a full detailed aioetcd.EtcdResult 62 | 63 | :param str key: Key. 64 | :returns: str value of the key 65 | :raises: KeyError if the key doesn't exists. 66 | """ 67 | res = yield from self.read(key) 68 | return res 69 | 70 | @asyncio.coroutine 71 | def get_value(self, key): 72 | res = yield from self.read(key) 73 | if res.value is None: 74 | raise aioetcd.EtcdException(102) 75 | return res.value 76 | 77 | @asyncio.coroutine 78 | def set(self, key, value, ttl=None): 79 | """ 80 | set the value of the key :param key: to the value :param value:. Is an 81 | alias of :method write: to expose a get/set API (with only most common 82 | args) 83 | 84 | """ 85 | result = yield from self._write(key, value, ttl=ttl) 86 | return result 87 | 88 | @asyncio.coroutine 89 | def update(self, node, value, force_index=False): 90 | params = {} 91 | if force_index: 92 | return params 93 | 94 | @asyncio.coroutine 95 | def delete(self, key, recursive=None, dir=None, **params): 96 | """ 97 | Removed a key from etcd. 98 | :param str key: Key. 99 | :param bool recursive: if we want to recursively delete a directory, 100 | set it to true 101 | :param bool dir: if we want to delete a directory, set it to true 102 | :param str prevValue: compare key to this value, and delete only if 103 | corresponding (optional). 104 | :param int prevIndex: modify key only if actual modifiedIndex matches 105 | the provided one (optional). 106 | 107 | :returns: aioetcd.EtcdResult 108 | 109 | :raises: KeyValue: if the key doesn't exists. 110 | """ 111 | key = key.lstrip('/') 112 | 113 | if recursive is not None: 114 | params['recursive'] = recursive and "true" or "false" 115 | if dir is not None: 116 | dir['dir'] = dir and "true" or "false" 117 | 118 | response = yield from self._delete("/v2/keys/%s" % key, params=params) 119 | return self._result_from_response(response) 120 | 121 | @asyncio.coroutine 122 | def machines(self): 123 | resp = yield from self._get("/v2/machines") 124 | raw = yield from resp.text() 125 | return [m.strip() for m in raw.split(',')] 126 | 127 | @asyncio.coroutine 128 | def leader(self): 129 | """ 130 | Returns: 131 | str. the leader of the cluster. 132 | """ 133 | resp = yield from self._get("/v2/leader") 134 | raw = yield from resp.text() 135 | return raw 136 | 137 | @asyncio.coroutine 138 | def watch(self, key, index=None, timeout=None): 139 | """ 140 | Blocks until a new event has been received, starting at index 'index' 141 | :param str key: key to watch 142 | :param int index: Index to start from. if None, start from current 143 | index 144 | :param timeout: max seconds to wait for a read. If None, no timeout, 145 | blocks forever 146 | :type timeout: int or float 147 | 148 | :returns: client.EtcdResult 149 | 150 | :raises KeyValue: If the key doesn't exists. 151 | :raises asyncio.TimeoutError: If timeout is reached. 152 | 153 | """ 154 | params = dict(wait=True) 155 | if index is not None: 156 | params['waitIndex'] = index 157 | if timeout is not None: 158 | params['timeout'] = timeout 159 | while 42: 160 | try: 161 | response = yield from self.read(key, None, **params) 162 | return response 163 | except asyncio.TimeoutError: 164 | if timeout is not None: 165 | raise 166 | 167 | @asyncio.coroutine 168 | def watch_iterator(self, key, index=None): 169 | """ 170 | return an iterator of self.watch() coroutines 171 | 172 | :param str key: key to watch 173 | :param int index: (optional) Index to start from. if None, start from 174 | current index 175 | :raises KeyValue: If the key doesn't exists. 176 | 177 | Usage:: 178 | 179 | >>> wi = yield from client.watch_iterator(key) 180 | >>> for watcher in wi: 181 | >>> resp = yield from watcher 182 | >>> print(resp.value) 183 | >>> if resp.value == '42': 184 | >>> break 185 | 186 | """ 187 | # TODO: add a timeout that raises StopIteration 188 | if index is None: 189 | result = yield from self.read(key) 190 | index = result.modifiedIndex 191 | return iter(self._watch_forever(key, index)) 192 | 193 | def _watch_forever(self, key, index=None, timeout=None): 194 | while 42: 195 | index += 1 196 | yield self.watch(key, index) 197 | 198 | @asyncio.coroutine 199 | def mkdir(self, key, ttl=None): 200 | """ create a dir key with the given ttl""" 201 | resp = yield from self._write(key, None, dir=True, ttl=None) 202 | return resp 203 | 204 | def read_sync(self, key, **params): 205 | loop = asyncio.new_event_loop() 206 | return loop.run_until_complete(self.read(key, loop, **params)) 207 | 208 | @asyncio.coroutine 209 | def _read_headers(self, key, loop=None, **params): 210 | loop = loop if loop is not None else self.loop 211 | key = key.lstrip('/') 212 | timeout = params.pop('timeout', self.read_timeout) 213 | for (k, v) in params.items(): 214 | if type(v) == bool: 215 | params[k] = v and "true" or "false" 216 | else: 217 | params[k] = v 218 | response = yield from self._get( 219 | "/v2/keys/%s" % key, params=params, timeout=timeout, loop=loop 220 | ) 221 | return response 222 | 223 | @asyncio.coroutine 224 | def _decode_response(self, response, timeout=None, loop=None): 225 | if timeout is None: 226 | timeout = self.read_timeout 227 | data = yield from asyncio.wait_for(response.text(), timeout, loop=loop) 228 | try: 229 | res = json.loads(data) 230 | headers = response.headers 231 | res['etcd_index'] = int(headers.get('x-etcd-index', 1)) 232 | res['raft_index'] = int(headers.get('x-raft-index', 1)) 233 | res['new'] = response.status == 201 234 | res['client'] = self 235 | return res 236 | except Exception as e: 237 | raise aioetcd.EtcdException( 238 | 'Unable to decode server response: %s\n\nData was: %s' % 239 | (e, data)) 240 | 241 | @asyncio.coroutine 242 | def read(self, key, loop=None, **params): 243 | """ 244 | Returns the value of the key 'key'. 245 | 246 | :param str key: Key. 247 | :param loop: the event loop to use for this request. Used internally 248 | for sync_read 249 | :param bool recursive (bool): If you should fetch recursively a dir 250 | :param bool wait (bool): If we should wait and return next time the 251 | key is changed 252 | :param int waitIndex (int): The index to fetch results from. 253 | :param bool sorted (bool): Sort the output keys (alphanumerically) 254 | :param int timeout (int): max seconds to wait for a read. 255 | 256 | :returns: 257 | aioetcd.EtcdResult (or an array of client.EtcdResult if a 258 | subtree is queried) 259 | 260 | :raises: 261 | KeyValue: If the key doesn't exists. 262 | asyncio.TimeoutError 263 | """ 264 | loop = loop if loop is not None else self.loop 265 | timeout = params.get('timeout', self.read_timeout) 266 | head = yield from self._read_headers(key, loop, **params) 267 | # TODO: substract current time from timeout 268 | result = yield from self._result_from_response(head, timeout, loop) 269 | return result 270 | 271 | @asyncio.coroutine 272 | def _write(self, key, value, append=False, **params): 273 | """ 274 | Writes the value for a key, possibly doing atomit Compare-and-Swap 275 | 276 | Args: 277 | :param str key: Key. 278 | :param str value: value to set 279 | :param int ttl: Time in seconds of expiration (optional). 280 | :param bool dir: Set to true if we are writing a directory; default is 281 | false. 282 | :param bool append: If true, it will post to append the new value to 283 | the dir, creating a sequential key. Defaults to false. 284 | :param str prevValue: compare key to this value, and swap only if 285 | corresponding (optional). 286 | :param int prevIndex: modify key only if actual modifiedIndex matches 287 | the provided one (optional). 288 | :param bool prevExist: If false, only create key; if true, only update 289 | key. 290 | 291 | Returns: 292 | client.EtcdResult 293 | """ 294 | key = key.lstrip('/') 295 | # params = {} 296 | if value is not None: 297 | params['value'] = value 298 | if params.get('dir', False): 299 | if value: 300 | raise aioetcd.EtcdException( 301 | 'Cannot create a directory with a value') 302 | for (k, v) in list(params.items()): 303 | if type(v) == bool: 304 | params[k] = v and "true" or "false" 305 | elif v is None: 306 | del params[k] 307 | 308 | method = append and self._post or self._put 309 | path = "/v2/keys/%s" % key 310 | response = yield from method(path, params=params) 311 | result = yield from self._result_from_response(response) 312 | return result 313 | 314 | @asyncio.coroutine 315 | def _result_from_response(self, response, timeout=None, loop=None): 316 | """ Creates an EtcdResult from json dictionary """ 317 | params = yield from self._decode_response(response, timeout, loop) 318 | if 'errorCode' in params: 319 | raise aioetcd.EtcdException(params['errorCode']) 320 | return aioetcd.Node(**params) 321 | 322 | @asyncio.coroutine 323 | def _get(self, path, params=None, timeout=None, loop=None): 324 | resp = yield from self._execute('get', path, params, timeout, loop) 325 | return resp 326 | 327 | @asyncio.coroutine 328 | def _put(self, path, params=None, timeout=None): 329 | resp = yield from self._execute('put', path, params, timeout) 330 | return resp 331 | 332 | @asyncio.coroutine 333 | def _post(self, path, params=None, timeout=None): 334 | resp = yield from self._execute('post', path, params, timeout) 335 | return resp 336 | 337 | @asyncio.coroutine 338 | def _delete(self, path, params=None, timeout=None): 339 | resp = yield from self._execute('delete', path, params, timeout) 340 | return resp 341 | 342 | @asyncio.coroutine 343 | def _update_machine_cache(self): 344 | if self.allow_reconnect: 345 | self._machine_cache = yield from self.machines() 346 | self._cache_update_scheduled = False 347 | 348 | @asyncio.coroutine 349 | def _execute(self, method, path, params=None, timeout=None, loop=None): 350 | if loop is None: 351 | loop = self.loop 352 | if timeout is None: 353 | timeout = self.read_timeout 354 | failed = False 355 | # TODO: whatif self._machines_cache is empty ? 356 | for idx, uri in enumerate(self._machines_cache): 357 | try: 358 | resp = yield from asyncio.wait_for( 359 | aiohttp.request( 360 | method, uri + path, params=params, loop=loop 361 | ), 362 | timeout, loop=loop 363 | ) 364 | if failed: 365 | self._machine_cache = self._machine_cache[idx:] 366 | if not self._cache_update_scheduled: 367 | self._cache_update_scheduled = True 368 | self.loop.create_task(self._update_machine_cache()) 369 | return resp 370 | except asyncio.TimeoutError: 371 | failed = True 372 | raise asyncio.TimeoutError() 373 | -------------------------------------------------------------------------------- /examples/simple_client.py: -------------------------------------------------------------------------------- 1 | import asyncio 2 | import aioetcd.client 3 | 4 | 5 | @asyncio.coroutine 6 | def print_leader(): 7 | print('print_leader') 8 | client = aioetcd.client.Client() 9 | result = yield from client.leader() 10 | print(result) 11 | 12 | 13 | @asyncio.coroutine 14 | def client_set(key, value): 15 | print('client_set') 16 | client = aioetcd.client.Client() 17 | result = yield from client.set(key, value) 18 | print(result) 19 | 20 | 21 | @asyncio.coroutine 22 | def client_get(key): 23 | print('client_get') 24 | client = aioetcd.client.Client() 25 | result = yield from client.get(key) 26 | print(result) 27 | 28 | 29 | @asyncio.coroutine 30 | def print_machines(): 31 | print('print_machine') 32 | client = aioetcd.client.Client() 33 | result = yield from client.machines() 34 | print(result) 35 | 36 | 37 | @asyncio.coroutine 38 | def watch_eternally(key): 39 | print('watch_eternally') 40 | client = aioetcd.client.Client(read_timeout=2, allow_reconnect=True) 41 | result = yield from client.watch(key) 42 | print(result) 43 | 44 | 45 | @asyncio.coroutine 46 | def watch_timeout(key): 47 | print('watch_timeout') 48 | client = aioetcd.client.Client(read_timeout=2, allow_reconnect=True) 49 | result = yield from client.watch(key, timeout=5) 50 | print(result) 51 | 52 | 53 | @asyncio.coroutine 54 | def watch_forever(key): 55 | print('watch_forever') 56 | client = aioetcd.client.Client(read_timeout=5, allow_reconnect=True) 57 | it = yield from client.watch_iterator(key) 58 | for watcher in it: 59 | resp = yield from watcher 60 | print(resp.value) 61 | if resp.value == '42': 62 | break 63 | 64 | 65 | @asyncio.coroutine 66 | def main(): 67 | print('---------------------') 68 | yield from print_leader() 69 | print('---------------------') 70 | yield from print_machines() 71 | print('---------------------') 72 | yield from client_set('hello', 43) 73 | print('---------------------') 74 | yield from client_get('hello') 75 | print('---------------------') 76 | # run : 77 | # etcdctl set hello 0 78 | # a couple of time and then 79 | # etcdctl set hello 42 80 | # as soon as it becomes boring 81 | yield from watch_forever('hello') 82 | print('---------------------') 83 | # run : 84 | # etcdctl set hello 0 85 | # to unlock 86 | yield from watch_eternally("hello") 87 | print('---------------------') 88 | # run : 89 | # etcdctl set hello 0 90 | # or wait 5 seconds to unlock 91 | yield from watch_timeout('hello') 92 | 93 | loop = asyncio.get_event_loop() 94 | loop.run_until_complete(main()) 95 | loop.close() 96 | -------------------------------------------------------------------------------- /requirements.txt: -------------------------------------------------------------------------------- 1 | aiohttp 2 | -------------------------------------------------------------------------------- /requirements_test.txt: -------------------------------------------------------------------------------- 1 | coverage 2 | flake8 3 | nose 4 | -------------------------------------------------------------------------------- /setup.cfg: -------------------------------------------------------------------------------- 1 | [easy_install] 2 | zip_ok = false 3 | 4 | [nosetests] 5 | nocapture = 1 6 | cover-package = aioetcd 7 | cover-erase = 1 8 | 9 | [flake8] 10 | ignore = N801,N802,N803,E226 11 | 12 | -------------------------------------------------------------------------------- /setup.py: -------------------------------------------------------------------------------- 1 | # -*- coding: utf-8 -*- 2 | """Python packaging.""" 3 | import os 4 | from setuptools import setup 5 | 6 | 7 | here = os.path.abspath(os.path.dirname(__file__)) 8 | 9 | NAME = 'aioetcd' 10 | DESCRIPTION = """Coroutine based etcd client""" 11 | try: 12 | README = open(os.path.join(here, 'README.md')).read() 13 | except: 14 | README = "" 15 | # VERSION = open(os.path.join(here, 'VERSION')).read().strip() 16 | VERSION = '0.1' 17 | AUTHOR = u'lisael' 18 | EMAIL = u'lisael@lisael.org' 19 | LICENSE = u'AGPL' 20 | URL = u'https://github.com/lisael/aioetcd' 21 | CLASSIFIERS = ['Development Status :: 3 - Alpha', 22 | 'Programming Language :: Python :: 3.4', 23 | 'License :: Other/Proprietary License'] 24 | KEYWORDS = ['asyncio', 'etcd'] 25 | PACKAGES = [ 26 | "aioetcd", 27 | ] 28 | 29 | NAMESPACE_PACKAGES = [] 30 | REQUIREMENTS = [ 31 | "aiohttp", 32 | ] 33 | 34 | SCRIPTS = [ 35 | ] 36 | 37 | 38 | if __name__ == '__main__': # Don't run setup() when we import this module. 39 | setup(name=NAME, 40 | version=VERSION, 41 | description=DESCRIPTION, 42 | long_description=README, 43 | classifiers=CLASSIFIERS, 44 | keywords=' '.join(KEYWORDS), 45 | author=AUTHOR, 46 | author_email=EMAIL, 47 | url=URL, 48 | license=LICENSE, 49 | packages=PACKAGES, 50 | namespace_packages=NAMESPACE_PACKAGES, 51 | include_package_data=True, 52 | zip_safe=False, 53 | scripts=SCRIPTS, 54 | install_requires=REQUIREMENTS, 55 | ) 56 | -------------------------------------------------------------------------------- /tests/test_client.py: -------------------------------------------------------------------------------- 1 | import unittest 2 | import asyncio 3 | 4 | from aioetcd.client import Client 5 | from aioetcd import FileNode 6 | 7 | 8 | class TestClient(unittest.TestCase): 9 | def test_tests(self): 10 | pass 11 | 12 | 13 | class EtcdError(OSError): 14 | def __init__(self, retcode, stderr): 15 | OSError.__init__(self, stderr) 16 | self.retcode = retcode 17 | 18 | 19 | class EtcdController: 20 | 21 | def __init__(self): 22 | self.loop = asyncio.get_event_loop() 23 | 24 | @asyncio.coroutine 25 | def _shell_exec(self, cmd): 26 | shell = asyncio.create_subprocess_shell( 27 | cmd, stdin=asyncio.subprocess.PIPE, 28 | stderr=asyncio.subprocess.PIPE, stdout=asyncio.subprocess.PIPE 29 | ) 30 | proc = yield from shell 31 | out, err = yield from proc.communicate() 32 | retcode = yield from proc.wait() 33 | if retcode: 34 | raise EtcdError(retcode, err.decode('ascii')) 35 | return out.decode('ascii').rstrip() 36 | 37 | @asyncio.coroutine 38 | def set(self, key, value): 39 | yield from self._shell_exec('etcdctl set {} {}'.format(key, value)) 40 | 41 | @asyncio.coroutine 42 | def mkdir(self, key): 43 | yield from self._shell_exec('etcdctl mkdir {}'.format(key)) 44 | 45 | @asyncio.coroutine 46 | def get(self, key): 47 | val = yield from self._shell_exec('etcdctl get {}'.format(key)) 48 | return val 49 | 50 | 51 | class TestRealClient(unittest.TestCase): 52 | """integration test with a real etcd server""" 53 | 54 | def setUp(self): 55 | self.loop = asyncio.get_event_loop() 56 | self.client = Client(loop=self.loop) 57 | self.async_results = {} 58 | 59 | def test_leader(self): 60 | leader = self.loop.run_until_complete(self.client.leader()) 61 | self.assertEquals(leader, "http://127.0.0.1:7001") 62 | 63 | def test_machines(self): 64 | machines = self.loop.run_until_complete(self.client.machines()) 65 | self.assertEquals(machines, ["http://127.0.0.1:4001"]) 66 | 67 | @asyncio.coroutine 68 | def _test_get(self): 69 | ctl = EtcdController() 70 | yield from ctl.set('test1', 43) 71 | node = yield from self.client.get('test1') 72 | self.assertEquals(node.value, '43') 73 | 74 | def test_get(self): 75 | self.loop.run_until_complete(self._test_get()) 76 | 77 | @asyncio.coroutine 78 | def _test_get_value(self): 79 | ctl = EtcdController() 80 | yield from ctl.set('test1', 42) 81 | val = yield from self.client.get_value('test1') 82 | self.assertEquals(val, '42') 83 | 84 | def test_get_value(self): 85 | self.loop.run_until_complete(self._test_get_value()) 86 | 87 | @asyncio.coroutine 88 | def _test_set(self): 89 | ctl = EtcdController() 90 | yield from ctl.set('test1', 43) 91 | node = yield from self.client.set('test1', 44) 92 | self.assertTrue(isinstance(node, FileNode)) 93 | val = yield from ctl.get('test1') 94 | self.assertEquals(val, '44') 95 | 96 | def test_set(self): 97 | self.loop.run_until_complete(self._test_set()) 98 | 99 | @asyncio.coroutine 100 | def _test_mkdir(self): 101 | ctl = EtcdController() 102 | dirname = '/testdir' 103 | dir_ = yield from self.client.mkdir(dirname) 104 | yield from ctl.set(dirname + '/file', 42) 105 | self.assertEquals(dir_.key, dirname) 106 | self.assertEquals(dir_.ttl, None) 107 | self.assertEquals(dir_.value, None) 108 | self.assertEquals(dir_.prev_node, None) 109 | self.assertEquals(dir_._children, []) 110 | 111 | def test_mkdir(self): 112 | self.loop.run_until_complete(self._test_mkdir()) 113 | 114 | @asyncio.coroutine 115 | def _test_delete(self): 116 | ctl = EtcdController() 117 | yield from ctl.set('test1', 42) 118 | val = yield from self.client.get_value('test1') 119 | self.assertEquals(val, '42') 120 | yield from self.client.delete('test1') 121 | with self.assertRaisesRegex(EtcdError, r'^Error:\s+100:'): 122 | yield from ctl.get('test1') 123 | 124 | def test_delete(self): 125 | self.loop.run_until_complete(self._test_delete()) 126 | 127 | @asyncio.coroutine 128 | def _watcher(self, key, index=None, timeout=None): 129 | yield from self.client.watch(key, index, timeout) 130 | self.async_results[key] = True 131 | 132 | @asyncio.coroutine 133 | def _test_watch(self): 134 | ctl = EtcdController() 135 | key = 'test_watch' 136 | yield from ctl.set(key, 42) 137 | 138 | # test a single key 139 | self.async_results[key] = False 140 | self.loop.create_task(self._watcher(key)) 141 | for i in range(42): 142 | yield from asyncio.sleep(0.02) 143 | self.assertFalse(self.async_results[key]) 144 | yield from ctl.set(key, 42) 145 | yield from asyncio.sleep(0.001) 146 | self.assertTrue(self.async_results[key]) 147 | 148 | # test with a wait index 149 | self.async_results[key] = False 150 | node = yield from self.client.get(key) 151 | self.loop.create_task(self._watcher(key, node.modifiedIndex + 2)) 152 | yield from asyncio.sleep(0.001) 153 | yield from ctl.set(key, 42) 154 | yield from asyncio.sleep(0.001) 155 | # index is not reached yet, it should not trigger 156 | self.assertFalse(self.async_results[key]) 157 | yield from ctl.set(key, 42) 158 | yield from asyncio.sleep(0.001) 159 | self.assertTrue(self.async_results[key]) 160 | 161 | # test timeout 162 | self.async_results[key] = False 163 | import time 164 | start = time.time() 165 | with self.assertRaises(asyncio.TimeoutError): 166 | yield from self._watcher(key, timeout=0.2) 167 | self.assertEquals(int((time.time() - start) * 10), 2) 168 | self.assertFalse(self.async_results[key]) 169 | 170 | @asyncio.coroutine 171 | def _iterator_watcher(self, key): 172 | self.async_results[key] = [] 173 | it = yield from self.client.watch_iterator(key) 174 | for w in it: 175 | resp = yield from w 176 | self.async_results[key].append(resp.value) 177 | if resp.value == '3': 178 | break 179 | 180 | @asyncio.coroutine 181 | def _test_watch_iterator(self): 182 | ctl = EtcdController() 183 | key = 'test_iterwatch' 184 | yield from ctl.set(key, 42) 185 | 186 | # test a single key 187 | self.async_results[key] = False 188 | self.loop.create_task(self._iterator_watcher(key)) 189 | yield from asyncio.sleep(0.001) 190 | for i in range(10): 191 | yield from ctl.set(key, i) 192 | yield from asyncio.sleep(0.001) 193 | self.assertEquals(self.async_results[key], ['0', '1', '2', '3']) 194 | 195 | def test_watch_iterator(self): 196 | self.loop.run_until_complete(self._test_watch_iterator()) 197 | 198 | 199 | class TestNodes(unittest.TestCase): 200 | def setUp(self): 201 | self.loop = asyncio.get_event_loop() 202 | self.client = Client(loop=self.loop) 203 | 204 | @asyncio.coroutine 205 | def _test_updatedir(self): 206 | ctl = EtcdController() 207 | dirname = '/testdir2' 208 | yield from ctl.mkdir(dirname) 209 | yield from self.client.get(dirname) 210 | 211 | def test_updatedir(self): 212 | self.loop.run_until_complete(self._test_updatedir()) 213 | 214 | @asyncio.coroutine 215 | def _test_changed(self): 216 | ctl = EtcdController() 217 | key = 'test_changed' 218 | yield from ctl.set(key, "orig") 219 | node = yield from self.client.get(key) 220 | changed = yield from node.changed() 221 | self.assertFalse(changed) 222 | val = yield from ctl.set(key, 'changed') 223 | yield from asyncio.sleep(0.01) 224 | changed = yield from node.changed() 225 | self.assertTrue(changed) 226 | val = yield from self.client.get_value(key) 227 | self.assertEquals(val, "changed") 228 | 229 | def test_changed(self): 230 | self.loop.run_until_complete(self._test_changed()) 231 | 232 | @asyncio.coroutine 233 | def _test_update(self): 234 | ctl = EtcdController() 235 | key = 'test_update' 236 | yield from ctl.set(key, "orig") 237 | node = yield from self.client.get(key) 238 | yield from ctl.set(key, 'changed') 239 | yield from node.update() 240 | self.assertEquals(node.value, "changed") 241 | 242 | def test_update(self): 243 | self.loop.run_until_complete(self._test_update()) 244 | 245 | @asyncio.coroutine 246 | def _test_prev_node(self): 247 | key = 'test_prev' 248 | yield from self.client.set(key, "orig") 249 | node2 = yield from self.client.set(key, "changed") 250 | self.assertEquals(node2.value, "changed") 251 | 252 | def test_prev_node(self): 253 | self.loop.run_until_complete(self._test_prev_node()) 254 | --------------------------------------------------------------------------------