biothings.web.handlers

biothings.web.handlers.base

Biothings Web Handlers

biothings.web.handlers.BaseHandler

Supports: - access to biothings namespace - monitor exceptions with Sentry

biothings.web.handlers.BaseAPIHandler

Additionally supports: - JSON and YAML payload in the request body - request arguments standardization - multi-type output (json, yaml, html, msgpack) - standardized error response (exception -> error template) - analytics and usage tracking (Google Analytics and AWS) - default common http headers (CORS and Cache Control)

class biothings.web.handlers.base.BaseAPIHandler(application: Application, request: HTTPServerRequest, **kwargs: Any)

Bases: BaseHandler, AnalyticsMixin

cache = None

cache_control_template = 'max-age={cache}, public'

format = 'json'

get_template_path()

Override to customize template path for each handler.

By default, we use the template_path application setting. Return None to load templates relative to the calling file.

initialize(cache=None)

kwargs = {'*': {'format': {'default': 'json', 'enum': ('json', 'yaml', 'html', 'msgpack'), 'type': <class 'str'>}}}

name = '__base__'

on_finish()

This is a tornado lifecycle hook. Override to provide tracking features.

options(*args, **kwargs)

prepare()

Called at the beginning of a request before get/post/etc.

Override this method to perform common initialization regardless of the request method. There is no guarantee that prepare will be called if an error occurs that is handled by the framework.

Asynchronous support: Use async def or decorate this method with .gen.coroutine to make it asynchronous. If this method returns an Awaitable execution will not proceed until the Awaitable is done.

Added in version 3.1: Asynchronous support.

set_cache_header(cache_value)

set_default_headers()

Override this to set HTTP headers at the beginning of the request.

For example, this is the place to set a custom Server header. Note that setting such headers in the normal flow of request processing may not do what you want, since headers may be reset during error handling.

write(chunk)

Writes the given chunk to the output buffer.

To write the output to the network, use the flush() method below.

If the given chunk is a dictionary, we write it as JSON and set the Content-Type of the response to be application/json. (if you want to send JSON as a different Content-Type, call set_header after calling write()).

Note that lists are not converted to JSON because of a potential cross-site security vulnerability. All JSON output should be wrapped in a dictionary. More details at http://haacked.com/archive/2009/06/25/json-hijacking.aspx/ and https://github.com/facebook/tornado/issues/1009

write_error(status_code, **kwargs)

from tornado.web import Finish, HTTPError

raise HTTPError(404) raise HTTPError(404, reason=”document not found”) raise HTTPError(404, None, {“id”: “-1”}, reason=”document not found”) -> {

“code”: 404, “success”: False, “error”: “document not found” “id”: “-1”

}

class biothings.web.handlers.base.BaseHandler(application: Application, request: HTTPServerRequest, **kwargs: Any)

Bases: RequestHandler

property biothings

biothings.web.handlers.query

Elasticsearch Handlers

biothings.web.handlers.BaseESRequestHandler

Supports: (all features above and) - access to biothing_type attribute - access to ES query pipeline stages - pretty print elasticsearch exceptions - common control option out_format

Subclasses: - biothings.web.handlers.MetadataSourceHandler - biothings.web.handlers.MetadataFieldHandler - myvariant.web.beacon.BeaconHandler

biothings.web.handlers.ESRequestHandler

Supports: (all features above and) - common control options (raw, rawquery) - common transform options (dotfield, always_list…) - query pipeline customization hooks - single query through GET - multiple quers through POST

Subclasses: - biothings.web.handlers.BiothingHandler - biothings.web.handlers.QueryHandler

class biothings.web.handlers.query.BaseQueryHandler(application: Application, request: HTTPServerRequest, **kwargs: Any)

Bases: BaseAPIHandler

initialize(biothing_type=None, *args, **kwargs)

prepare()

Called at the beginning of a request before get/post/etc.

Override this method to perform common initialization regardless of the request method. There is no guarantee that prepare will be called if an error occurs that is handled by the framework.

Asynchronous support: Use async def or decorate this method with .gen.coroutine to make it asynchronous. If this method returns an Awaitable execution will not proceed until the Awaitable is done.

Added in version 3.1: Asynchronous support.

write(chunk)

Writes the given chunk to the output buffer.

To write the output to the network, use the flush() method below.

If the given chunk is a dictionary, we write it as JSON and set the Content-Type of the response to be application/json. (if you want to send JSON as a different Content-Type, call set_header after calling write()).

Note that lists are not converted to JSON because of a potential cross-site security vulnerability. All JSON output should be wrapped in a dictionary. More details at http://haacked.com/archive/2009/06/25/json-hijacking.aspx/ and https://github.com/facebook/tornado/issues/1009

class biothings.web.handlers.query.BiothingHandler(application: Application, request: HTTPServerRequest, **kwargs: Any)

Bases: BaseQueryHandler

Biothings Annotation Endpoint

URL pattern examples:

/{pre}/{ver}/{typ}/? /{pre}/{ver}/{typ}/([^/]+)/?

queries a term against a pre-determined field that represents the id of a document, like _id and dbsnp.rsid

GET -> {…} or [{…}, …] POST -> [{…}, …]

async get(**kwargs)

name = 'annotation'

async post(**kwargs)

class biothings.web.handlers.query.MetadataFieldHandler(application: Application, request: HTTPServerRequest, **kwargs: Any)

Bases: BaseQueryHandler

GET /metadata/fields

async get()

kwargs = {'*': {'format': {'default': 'json', 'enum': ('json', 'yaml', 'html', 'msgpack'), 'type': <class 'str'>}}, 'GET': {'prefix': {'default': None, 'type': <class 'str'>}, 'raw': {'default': False, 'type': <class 'bool'>}, 'search': {'default': None, 'type': <class 'str'>}}}

name = 'fields'

class biothings.web.handlers.query.MetadataSourceHandler(application: Application, request: HTTPServerRequest, **kwargs: Any)

Bases: BaseQueryHandler

GET /metadata

extras(_meta)

Override to add app specific metadata.

async get()

kwargs = {'*': {'format': {'default': 'json', 'enum': ('json', 'yaml', 'html', 'msgpack'), 'type': <class 'str'>}}, 'GET': {'dev': {'default': False, 'type': <class 'bool'>}, 'raw': {'default': False, 'type': <class 'bool'>}}}

name = 'metadata'

class biothings.web.handlers.query.QueryHandler(application: Application, request: HTTPServerRequest, **kwargs: Any)

Bases: BaseQueryHandler

Biothings Query Endpoint

URL pattern examples:

/{pre}/{ver}/{typ}/query/? /{pre}/{ver}//query/?

GET -> {…} POST -> [{…}, …]

async get(**kwargs)

name = 'query'

async post(**kwargs)

biothings.web.handlers.services

class biothings.web.handlers.services.APISpecificationHandler(application: Application, request: HTTPServerRequest, **kwargs: Any)

Bases: BaseAPIHandler

get()

class biothings.web.handlers.services.FrontPageHandler(application: Application, request: HTTPServerRequest, **kwargs: Any)

Bases: BaseHandler

get()

get_template_path()

Override to customize template path for each handler.

By default, we use the template_path application setting. Return None to load templates relative to the calling file.

class biothings.web.handlers.services.StatusHandler(application: Application, request: HTTPServerRequest, **kwargs: Any)

Bases: BaseHandler

Web service health check

async get()

head()