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exposition.py
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import base64 from contextlib import closing import gzip from http.server import BaseHTTPRequestHandler import os import socket from socketserver import ThreadingMixIn import ssl import sys import threading from typing import Any, Callable, Dict, List, Optional, Sequence, Tuple, Union from urllib.error import HTTPError from urllib.parse import parse_qs, quote_plus, urlparse from urllib.request import ( BaseHandler, build_opener, HTTPHandler, HTTPRedirectHandler, HTTPSHandler, Request, ) from wsgiref.simple_server import make_server, WSGIRequestHandler, WSGIServer from .openmetrics import exposition as openmetrics from .registry import CollectorRegistry, REGISTRY from .utils import floatToGoString __all__ = ( 'CONTENT_TYPE_LATEST', 'delete_from_gateway', 'generate_latest', 'instance_ip_grouping_key', 'make_asgi_app', 'make_wsgi_app', 'MetricsHandler', 'push_to_gateway', 'pushadd_to_gateway', 'start_http_server', 'start_wsgi_server', 'write_to_textfile', ) CONTENT_TYPE_LATEST = 'text/plain; version=0.0.4; charset=utf-8' """Content type of the latest text format""" class _PrometheusRedirectHandler(HTTPRedirectHandler): """ Allow additional methods (e.g. PUT) and data forwarding in redirects. Use of this class constitute a user's explicit agreement to the redirect responses the Prometheus client will receive when using it. You should only use this class if you control or otherwise trust the redirect behavior involved and are certain it is safe to full transfer the original request (method and data) to the redirected URL. For example, if you know there is a cosmetic URL redirect in front of a local deployment of a Prometheus server, and all redirects are safe, this is the class to use to handle redirects in that case. The standard HTTPRedirectHandler does not forward request data nor does it allow redirected PUT requests (which Prometheus uses for some operations, for example `push_to_gateway`) because these cannot generically guarantee no violations of HTTP RFC 2616 requirements for the user to explicitly confirm redirects that could have unexpected side effects (such as rendering a PUT request non-idempotent or creating multiple resources not named in the original request). """ def redirect_request(self, req, fp, code, msg, headers, newurl): """ Apply redirect logic to a request. See parent HTTPRedirectHandler.redirect_request for parameter info. If the redirect is disallowed, this raises the corresponding HTTP error. If the redirect can't be determined, return None to allow other handlers to try. If the redirect is allowed, return the new request. This method specialized for the case when (a) the user knows that the redirect will not cause unacceptable side effects for any request method, and (b) the user knows that any request data should be passed through to the redirect. If either condition is not met, this should not be used. """ # note that requests being provided by a handler will use get_method to # indicate the method, by monkeypatching this, instead of setting the # Request object's method attribute. m = getattr(req, "method", req.get_method()) if not (code in (301, 302, 303, 307) and m in ("GET", "HEAD") or code in (301, 302, 303) and m in ("POST", "PUT")): raise HTTPError(req.full_url, code, msg, headers, fp) new_request = Request( newurl.replace(' ', '%20'), # space escaping in new url if needed. headers=req.headers, origin_req_host=req.origin_req_host, unverifiable=True, data=req.data, ) new_request.method = m return new_request def _bake_output(registry, accept_header, accept_encoding_header, params, disable_compression): """Bake output for metrics output.""" # Choose the correct plain text format of the output. encoder, content_type = choose_encoder(accept_header) if 'name[]' in params: registry = registry.restricted_registry(params['name[]']) output = encoder(registry) headers = [('Content-Type', content_type)] # If gzip encoding required, gzip the output. if not disable_compression and gzip_accepted(accept_encoding_header): output = gzip.compress(output) headers.append(('Content-Encoding', 'gzip')) return '200 OK', headers, output def make_wsgi_app(registry: CollectorRegistry = REGISTRY, disable_compression: bool = False) -> Callable: """Create a WSGI app which serves the metrics from a registry.""" def prometheus_app(environ, start_response): # Prepare parameters accept_header = environ.get('HTTP_ACCEPT') accept_encoding_header = environ.get('HTTP_ACCEPT_ENCODING') params = parse_qs(environ.get('QUERY_STRING', '')) if environ['PATH_INFO'] == '/favicon.ico': # Serve empty response for browsers status = '200 OK' headers = [('', '')] output = b'' else: # Bake output status, headers, output = _bake_output(registry, accept_header, accept_encoding_header, params, disable_compression) # Return output start_response(status, headers) return [output] return prometheus_app class _SilentHandler(WSGIRequestHandler): """WSGI handler that does not log requests.""" def log_message(self, format, *args): """Log nothing.""" class ThreadingWSGIServer(ThreadingMixIn, WSGIServer): """Thread per request HTTP server.""" # Make worker threads "fire and forget". Beginning with Python 3.7 this # prevents a memory leak because ``ThreadingMixIn`` starts to gather all # non-daemon threads in a list in order to join on them at server close. daemon_threads = True def _get_best_family(address, port): """Automatically select address family depending on address""" # HTTPServer defaults to AF_INET, which will not start properly if # binding an ipv6 address is requested. # This function is based on what upstream python did for http.server # in https://github.com/python/cpython/pull/11767 infos = socket.getaddrinfo(address, port, type=socket.SOCK_STREAM, flags=socket.AI_PASSIVE) family, _, _, _, sockaddr = next(iter(infos)) return family, sockaddr[0] def _get_ssl_ctx( certfile: str, keyfile: str, protocol: int, cafile: Optional[str] = None, capath: Optional[str] = None, client_auth_required: bool = False, ) -> ssl.SSLContext: """Load context supports SSL.""" ssl_cxt = ssl.SSLContext(protocol=protocol) if cafile is not None or capath is not None: try: ssl_cxt.load_verify_locations(cafile, capath) except IOError as exc: exc_type = type(exc) msg = str(exc) raise exc_type(f"Cannot load CA certificate chain from file " f"{cafile!r} or directory {capath!r}: {msg}") else: try: ssl_cxt.load_default_certs(purpose=ssl.Purpose.CLIENT_AUTH) except IOError as exc: exc_type = type(exc) msg = str(exc) raise exc_type(f"Cannot load default CA certificate chain: {msg}") if client_auth_required: ssl_cxt.verify_mode = ssl.CERT_REQUIRED try: ssl_cxt.load_cert_chain(certfile=certfile, keyfile=keyfile) except IOError as exc: exc_type = type(exc) msg = str(exc) raise exc_type(f"Cannot load server certificate file {certfile!r} or " f"its private key file {keyfile!r}: {msg}") return ssl_cxt def start_wsgi_server( port: int, addr: str = '0.0.0.0', registry: CollectorRegistry = REGISTRY, certfile: Optional[str] = None, keyfile: Optional[str] = None, client_cafile: Optional[str] = None, client_capath: Optional[str] = None, protocol: int = ssl.PROTOCOL_TLS_SERVER, client_auth_required: bool = False, ) -> Tuple[WSGIServer, threading.Thread]: """Starts a WSGI server for prometheus metrics as a daemon thread.""" class TmpServer(ThreadingWSGIServer): """Copy of ThreadingWSGIServer to update address_family locally""" TmpServer.address_family, addr = _get_best_family(addr, port) app = make_wsgi_app(registry) httpd = make_server(addr, port, app, TmpServer, handler_class=_SilentHandler) if certfile and keyfile: context = _get_ssl_ctx(certfile, keyfile, protocol, client_cafile, client_capath, client_auth_required) httpd.socket = context.wrap_socket(httpd.socket, server_side=True) t = threading.Thread(target=httpd.serve_forever) t.daemon = True t.start() return httpd, t start_http_server = start_wsgi_server def generate_latest(registry: CollectorRegistry = REGISTRY) -> bytes: """Returns the metrics from the registry in latest text format as a string.""" def sample_line(line): if line.labels: labelstr = '{{{0}}}'.format(','.join( ['{}="{}"'.format( k, v.replace('\\', r'\\').replace('\n', r'\n').replace('"', r'\"')) for k, v in sorted(line.labels.items())])) else: labelstr = '' timestamp = '' if line.timestamp is not None: # Convert to milliseconds. timestamp = f' {int(float(line.timestamp) * 1000):d}' return f'{line.name}{labelstr} {floatToGoString(line.value)}{timestamp}\n' output = [] for metric in registry.collect(): try: mname = metric.name mtype = metric.type # Munging from OpenMetrics into Prometheus format. if mtype == 'counter': mname = mname + '_total' elif mtype == 'info': mname = mname + '_info' mtype = 'gauge' elif mtype == 'stateset': mtype = 'gauge' elif mtype == 'gaugehistogram': # A gauge histogram is really a gauge, # but this captures the structure better. mtype = 'histogram' elif mtype == 'unknown': mtype = 'untyped' output.append('# HELP {} {}\n'.format( mname, metric.documentation.replace('\\', r'\\').replace('\n', r'\n'))) output.append(f'# TYPE {mname} {mtype}\n') om_samples: Dict[str, List[str]] = {} for s in metric.samples: for suffix in ['_created', '_gsum', '_gcount']: if s.name == metric.name + suffix: # OpenMetrics specific sample, put in a gauge at the end. om_samples.setdefault(suffix, []).append(sample_line(s)) break else: output.append(sample_line(s)) except Exception as exception: exception.args = (exception.args or ('',)) + (metric,) raise for suffix, lines in sorted(om_samples.items()): output.append('# HELP {}{} {}\n'.format(metric.name, suffix, metric.documentation.replace('\\', r'\\').replace('\n', r'\n'))) output.append(f'# TYPE {metric.name}{suffix} gauge\n') output.extend(lines) return ''.join(output).encode('utf-8') def choose_encoder(accept_header: str) -> Tuple[Callable[[CollectorRegistry], bytes], str]: accept_header = accept_header or '' for accepted in accept_header.split(','): if accepted.split(';')[0].strip() == 'application/openmetrics-text': return (openmetrics.generate_latest, openmetrics.CONTENT_TYPE_LATEST) return generate_latest, CONTENT_TYPE_LATEST def gzip_accepted(accept_encoding_header: str) -> bool: accept_encoding_header = accept_encoding_header or '' for accepted in accept_encoding_header.split(','): if accepted.split(';')[0].strip().lower() == 'gzip': return True return False class MetricsHandler(BaseHTTPRequestHandler): """HTTP handler that gives metrics from ``REGISTRY``.""" registry: CollectorRegistry = REGISTRY def do_GET(self) -> None: # Prepare parameters registry = self.registry accept_header = self.headers.get('Accept') accept_encoding_header = self.headers.get('Accept-Encoding') params = parse_qs(urlparse(self.path).query) # Bake output status, headers, output = _bake_output(registry, accept_header, accept_encoding_header, params, False) # Return output self.send_response(int(status.split(' ')[0])) for header in headers: self.send_header(*header) self.end_headers() self.wfile.write(output) def log_message(self, format: str, *args: Any) -> None: """Log nothing.""" @classmethod def factory(cls, registry: CollectorRegistry) -> type: """Returns a dynamic MetricsHandler class tied to the passed registry. """ # This implementation relies on MetricsHandler.registry # (defined above and defaulted to REGISTRY). # As we have unicode_literals, we need to create a str() # object for type(). cls_name = str(cls.__name__) MyMetricsHandler = type(cls_name, (cls, object), {"registry": registry}) return MyMetricsHandler def write_to_textfile(path: str, registry: CollectorRegistry) -> None: """Write metrics to the given path. This is intended for use with the Node exporter textfile collector. The path must end in .prom for the textfile collector to process it.""" tmppath = f'{path}.{os.getpid()}.{threading.current_thread().ident}' with open(tmppath, 'wb') as f: f.write(generate_latest(registry)) # rename(2) is atomic but fails on Windows if the destination file exists if os.name == 'nt': os.replace(tmppath, path) else: os.rename(tmppath, path) def _make_handler( url: str, method: str, timeout: Optional[float], headers: Sequence[Tuple[str, str]], data: bytes, base_handler: Union[BaseHandler, type], ) -> Callable[[], None]: def handle() -> None: request = Request(url, data=data) request.get_method = lambda: method # type: ignore for k, v in headers: request.add_header(k, v) resp = build_opener(base_handler).open(request, timeout=timeout) if resp.code >= 400: raise OSError(f"error talking to pushgateway: {resp.code} {resp.msg}") return handle def default_handler( url: str, method: str, timeout: Optional[float], headers: List[Tuple[str, str]], data: bytes, ) -> Callable[[], None]: """Default handler that implements HTTP/HTTPS connections. Used by the push_to_gateway functions. Can be re-used by other handlers.""" return _make_handler(url, method, timeout, headers, data, HTTPHandler) def passthrough_redirect_handler( url: str, method: str, timeout: Optional[float], headers: List[Tuple[str, str]], data: bytes, ) -> Callable[[], None]: """ Handler that automatically trusts redirect responses for all HTTP methods. Augments standard HTTPRedirectHandler capability by permitting PUT requests, preserving the method upon redirect, and passing through all headers and data from the original request. Only use this handler if you control or trust the source of redirect responses you encounter when making requests via the Prometheus client. This handler will simply repeat the identical request, including same method and data, to the new redirect URL.""" return _make_handler(url, method, timeout, headers, data, _PrometheusRedirectHandler) def basic_auth_handler( url: str, method: str, timeout: Optional[float], headers: List[Tuple[str, str]], data: bytes, username: Optional[str] = None, password: Optional[str] = None, ) -> Callable[[], None]: """Handler that implements HTTP/HTTPS connections with Basic Auth. Sets auth headers using supplied 'username' and 'password', if set. Used by the push_to_gateway functions. Can be re-used by other handlers.""" def handle(): """Handler that implements HTTP Basic Auth. """ if username is not None and password is not None: auth_value = f'{username}:{password}'.encode() auth_token = base64.b64encode(auth_value) auth_header = b'Basic ' + auth_token headers.append(('Authorization', auth_header)) default_handler(url, method, timeout, headers, data)() return handle def tls_auth_handler( url: str, method: str, timeout: Optional[float], headers: List[Tuple[str, str]], data: bytes, certfile: str, keyfile: str, cafile: Optional[str] = None, protocol: int = ssl.PROTOCOL_TLS_CLIENT, insecure_skip_verify: bool = False, ) -> Callable[[], None]: """Handler that implements an HTTPS connection with TLS Auth. The default protocol (ssl.PROTOCOL_TLS_CLIENT) will also enable ssl.CERT_REQUIRED and SSLContext.check_hostname by default. This can be disabled by setting insecure_skip_verify to True. Both this handler and the TLS feature on pushgateay are experimental.""" context = ssl.SSLContext(protocol=protocol) if cafile is not None: context.load_verify_locations(cafile) else: context.load_default_certs() if insecure_skip_verify: context.check_hostname = False context.verify_mode = ssl.CERT_NONE context.load_cert_chain(certfile=certfile, keyfile=keyfile) handler = HTTPSHandler(context=context) return _make_handler(url, method, timeout, headers, data, handler) def push_to_gateway( gateway: str, job: str, registry: CollectorRegistry, grouping_key: Optional[Dict[str, Any]] = None, timeout: Optional[float] = 30, handler: Callable = default_handler, ) -> None: """Push metrics to the given pushgateway. `gateway` the url for your push gateway. Either of the form 'http://pushgateway.local', or 'pushgateway.local'. Scheme defaults to 'http' if none is provided `job` is the job label to be attached to all pushed metrics `registry` is an instance of CollectorRegistry `grouping_key` please see the pushgateway documentation for details. Defaults to None `timeout` is how long push will attempt to connect before giving up. Defaults to 30s, can be set to None for no timeout. `handler` is an optional function which can be provided to perform requests to the 'gateway'. Defaults to None, in which case an http or https request will be carried out by a default handler. If not None, the argument must be a function which accepts the following arguments: url, method, timeout, headers, and content May be used to implement additional functionality not supported by the built-in default handler (such as SSL client certicates, and HTTP authentication mechanisms). 'url' is the URL for the request, the 'gateway' argument described earlier will form the basis of this URL. 'method' is the HTTP method which should be used when carrying out the request. 'timeout' requests not successfully completed after this many seconds should be aborted. If timeout is None, then the handler should not set a timeout. 'headers' is a list of ("header-name","header-value") tuples which must be passed to the pushgateway in the form of HTTP request headers. The function should raise an exception (e.g. IOError) on failure. 'content' is the data which should be used to form the HTTP Message Body. This overwrites all metrics with the same job and grouping_key. This uses the PUT HTTP method.""" _use_gateway('PUT', gateway, job, registry, grouping_key, timeout, handler) def pushadd_to_gateway( gateway: str, job: str, registry: Optional[CollectorRegistry], grouping_key: Optional[Dict[str, Any]] = None, timeout: Optional[float] = 30, handler: Callable = default_handler, ) -> None: """PushAdd metrics to the given pushgateway. `gateway` the url for your push gateway. Either of the form 'http://pushgateway.local', or 'pushgateway.local'. Scheme defaults to 'http' if none is provided `job` is the job label to be attached to all pushed metrics `registry` is an instance of CollectorRegistry `grouping_key` please see the pushgateway documentation for details. Defaults to None `timeout` is how long push will attempt to connect before giving up. Defaults to 30s, can be set to None for no timeout. `handler` is an optional function which can be provided to perform requests to the 'gateway'. Defaults to None, in which case an http or https request will be carried out by a default handler. See the 'prometheus_client.push_to_gateway' documentation for implementation requirements. This replaces metrics with the same name, job and grouping_key. This uses the POST HTTP method.""" _use_gateway('POST', gateway, job, registry, grouping_key, timeout, handler) def delete_from_gateway( gateway: str, job: str, grouping_key: Optional[Dict[str, Any]] = None, timeout: Optional[float] = 30, handler: Callable = default_handler, ) -> None: """Delete metrics from the given pushgateway. `gateway` the url for your push gateway. Either of the form 'http://pushgateway.local', or 'pushgateway.local'. Scheme defaults to 'http' if none is provided `job` is the job label to be attached to all pushed metrics `grouping_key` please see the pushgateway documentation for details. Defaults to None `timeout` is how long delete will attempt to connect before giving up. Defaults to 30s, can be set to None for no timeout. `handler` is an optional function which can be provided to perform requests to the 'gateway'. Defaults to None, in which case an http or https request will be carried out by a default handler. See the 'prometheus_client.push_to_gateway' documentation for implementation requirements. This deletes metrics with the given job and grouping_key. This uses the DELETE HTTP method.""" _use_gateway('DELETE', gateway, job, None, grouping_key, timeout, handler) def _use_gateway( method: str, gateway: str, job: str, registry: Optional[CollectorRegistry], grouping_key: Optional[Dict[str, Any]], timeout: Optional[float], handler: Callable, ) -> None: gateway_url = urlparse(gateway) # See https://bugs.python.org/issue27657 for details on urlparse in py>=3.7.6. if not gateway_url.scheme or gateway_url.scheme not in ['http', 'https']: gateway = f'http://{gateway}' gateway = gateway.rstrip('/') url = '{}/metrics/{}/{}'.format(gateway, *_escape_grouping_key("job", job)) data = b'' if method != 'DELETE': if registry is None: registry = REGISTRY data = generate_latest(registry) if grouping_key is None: grouping_key = {} url += ''.join( '/{}/{}'.format(*_escape_grouping_key(str(k), str(v))) for k, v in sorted(grouping_key.items())) handler( url=url, method=method, timeout=timeout, headers=[('Content-Type', CONTENT_TYPE_LATEST)], data=data, )() def _escape_grouping_key(k, v): if v == "": # Per https://github.com/prometheus/pushgateway/pull/346. return k + "@base64", "=" elif '/' in v: # Added in Pushgateway 0.9.0. return k + "@base64", base64.urlsafe_b64encode(v.encode("utf-8")).decode("utf-8") else: return k, quote_plus(v) def instance_ip_grouping_key() -> Dict[str, Any]: """Grouping key with instance set to the IP Address of this host.""" with closing(socket.socket(socket.AF_INET, socket.SOCK_DGRAM)) as s: if sys.platform == 'darwin': # This check is done this way only on MacOS devices # it is done this way because the localhost method does # not work. # This method was adapted from this StackOverflow answer: # https://stackoverflow.com/a/28950776 s.connect(('10.255.255.255', 1)) else: s.connect(('localhost', 0)) return {'instance': s.getsockname()[0]} from .asgi import make_asgi_app # noqa