aws_xray_sdk.core.models package

Submodules

aws_xray_sdk.core.models.default_dynamic_naming module

class aws_xray_sdk.core.models.default_dynamic_naming.DefaultDynamicNaming(pattern, fallback)

Bases: object

Decides what name to use on a segment generated from an incoming request. By default it takes the host name and compares it to a pre-defined pattern. If the host name matches that pattern, it returns the host name, otherwise it returns the fallback name. The host name usually comes from the incoming request’s headers.

get_name(host_name)

Returns the segment name based on the input host name.

aws_xray_sdk.core.models.dummy_entities module

class aws_xray_sdk.core.models.dummy_entities.DummySegment(name='dummy')

Bases: Segment

A dummy segment is created when xray_recorder decide to not sample the segment based on sampling rules. Adding data to a dummy segment becomes a no-op except for subsegments. This is to reduce the memory footprint of the SDK. A dummy segment will not be sent to the X-Ray daemon. Manually create dummy segments is not recommended.

add_exception(exception, stack, remote=False)

No-op

apply_status_code(status_code)

No-op

put_annotation(key, value)

No-op

put_http_meta(key, value)

No-op

put_metadata(key, value, namespace='default')

No-op

serialize()

No-op

set_aws(aws_meta)

No-op

set_service(service_info)

No-op

set_user(user)

No-op

class aws_xray_sdk.core.models.dummy_entities.DummySubsegment(segment, name='dummy')

Bases: Subsegment

A dummy subsegment will be created when xray_recorder tries to create a subsegment under a not sampled segment. Adding data to a dummy subsegment becomes no-op. Dummy subsegment will not be sent to the X-Ray daemon.

add_exception(exception, stack, remote=False)

No-op

apply_status_code(status_code)

No-op

put_annotation(key, value)

No-op

put_http_meta(key, value)

No-op

put_metadata(key, value, namespace='default')

No-op

serialize()

No-op

set_aws(aws_meta)

No-op

set_sql(sql)

No-op

aws_xray_sdk.core.models.entity module

class aws_xray_sdk.core.models.entity.Entity(name)

Bases: object

The parent class for segment/subsegment. It holds common properties and methods on segment and subsegment.

add_error_flag()

add_exception(exception, stack, remote=False)

Add an exception to trace entities.

Parameters:

• exception (Exception) – the catched exception.

• stack (list) – the output from python built-in traceback.extract_stack().

• remote (bool) – If False it means it’s a client error instead of a downstream service.

add_fault_flag()

add_subsegment(subsegment)

Add input subsegment as a child subsegment.

add_throttle_flag()

apply_status_code(status_code)

When a trace entity is generated under the http context, the status code will affect this entity’s fault/error/throttle flags. Flip these flags based on status code.

close(end_time=None)

Close the trace entity by setting end_time and flip the in progress flag to False.

Parameters:

end_time (int) – Epoch in seconds. If not specified current time will be used.

get_origin_trace_header()

Retrieve saved trace header data.

put_annotation(key, value)

Annotate segment or subsegment with a key-value pair. Annotations will be indexed for later search query.

Parameters:

• key (str) – annotation key

• value (object) – annotation value. Any type other than string/number/bool will be dropped

put_http_meta(key, value)

Add http related metadata.

Parameters:

• key (str) – Currently supported keys are: * url * method * user_agent * client_ip * status * content_length

• value – status and content_length are int and for other supported keys string should be used.

put_metadata(key, value, namespace='default')

Add metadata to segment or subsegment. Metadata is not indexed but can be later retrieved by BatchGetTraces API.

Parameters:

• namespace (str) – optional. Default namespace is default. It must be a string and prefix AWS. is reserved.

• key (str) – metadata key under specified namespace

• value (object) – any object that can be serialized into JSON string

remove_subsegment(subsegment)

Remove input subsegment from child subsegments.

save_origin_trace_header(trace_header)

Temporarily store additional data fields in trace header to the entity for later propagation. The data will be cleaned up upon serialization.

serialize()

Serialize to JSON document that can be accepted by the X-Ray backend service. It uses jsonpickle to perform serialization.

set_aws(aws_meta)

set aws section of the entity. This method is called by global recorder and botocore patcher to provide additonal information about AWS runtime. It is not recommended to manually set aws section.

aws_xray_sdk.core.models.facade_segment module

class aws_xray_sdk.core.models.facade_segment.FacadeSegment(name, entityid, traceid, sampled)

Bases: Segment

This type of segment should only be used in an AWS Lambda environment. It holds the same id, traceid and sampling decision as the segment generated by Lambda service but its properties cannot be mutated except for its subsegments. If this segment is created before Lambda worker finishes initializatioin, all the child subsegments will be discarded.

add_error_flag()

Unsupported operation. Will raise an exception.

add_exception(exception, stack, remote=False)

Unsupported operation. Will raise an exception.

add_fault_flag()

Unsupported operation. Will raise an exception.

add_throttle_flag()

Unsupported operation. Will raise an exception.

apply_status_code(status_code)

Unsupported operation. Will raise an exception.

close(end_time=None)

Unsupported operation. Will raise an exception.

decrement_ref_counter()

No-op

increment()

Increment total subsegments counter by 1.

put_annotation(key, value)

Unsupported operation. Will raise an exception.

put_http_meta(key, value)

Unsupported operation. Will raise an exception.

put_metadata(key, value, namespace='default')

Unsupported operation. Will raise an exception.

ready_to_send()

Facade segment should never be sent out. This always return False.

serialize()

Unsupported operation. Will raise an exception.

set_aws(aws_meta)

Unsupported operation. Will raise an exception.

set_user(user)

Unsupported operation. Will raise an exception.

aws_xray_sdk.core.models.http module

aws_xray_sdk.core.models.noop_traceid module

aws_xray_sdk.core.models.segment module

class aws_xray_sdk.core.models.segment.Segment(name, entityid=None, traceid=None, parent_id=None, sampled=True)

Bases: Entity

The compute resources running your application logic send data about their work as segments. A segment provides the resource’s name, details about the request, and details about the work done.

add_subsegment(subsegment)

Add input subsegment as a child subsegment and increment reference counter and total subsegments counter.

decrement_ref_counter()

Decrement reference counter by 1 when a subsegment is closed.

decrement_subsegments_size()

Decrement total subsegments by 1. This usually happens when a subsegment is streamed out.

get_total_subsegments_size()

Return the number of total subsegments regardless of open or closed.

increment()

Increment reference counter to track on open subsegments and total subsegments counter to track total size of subsegments it currently hold.

ready_to_send()

Return True if the segment doesn’t have any open subsegments and itself is not in progress.

remove_subsegment(subsegment)

Remove the reference of input subsegment.

set_rule_name(rule_name)

Add the matched centralized sampling rule name if a segment is sampled because of that rule. This method should be only used by the recorder.

set_service(service_info)

Add python runtime and version info. This method should be only used by the recorder.

set_user(user)

set user of a segment. One segment can only have one user. User is indexed and can be later queried.

class aws_xray_sdk.core.models.segment.SegmentContextManager(recorder, name=None, **segment_kwargs)

Bases: object

Wrapper for segment and recorder to provide segment context manager.

aws_xray_sdk.core.models.subsegment module

class aws_xray_sdk.core.models.subsegment.Subsegment(name, namespace, segment)

Bases: Entity

The work done in a single segment can be broke down into subsegments. Subsegments provide more granular timing information and details about downstream calls that your application made to fulfill the original request. A subsegment can contain additional details about a call to an AWS service, an external HTTP API, or an SQL database.

add_subsegment(subsegment)

Add input subsegment as a child subsegment and increment reference counter and total subsegments counter of the parent segment.

close(end_time=None)

Close the trace entity by setting end_time and flip the in progress flag to False. Also decrement parent segment’s ref counter by 1.

Parameters:

end_time (int) – Epoch in seconds. If not specified current time will be used.

remove_subsegment(subsegment)

Remove input subsegment from child subsegemnts and decrement parent segment total subsegments count.

Parameters:

Subsegment – subsegment to remove.

set_sql(sql)

Set sql related metadata. This function is used by patchers for database connectors and is not recommended to invoke manually.

Parameters:

sql (dict) – sql related metadata

class aws_xray_sdk.core.models.subsegment.SubsegmentContextManager(recorder, name=None, **subsegment_kwargs)

Bases: object

Wrapper for segment and recorder to provide segment context manager.

aws_xray_sdk.core.models.subsegment.is_already_recording(func)

aws_xray_sdk.core.models.subsegment.set_as_recording(decorated_func, wrapped)

aws_xray_sdk.core.models.subsegment.subsegment_decorator(wrapper=None, enabled=None, adapter=None, proxy=<class 'FunctionWrapper'>)

aws_xray_sdk.core.models.throwable module

class aws_xray_sdk.core.models.throwable.Throwable(exception, stack, remote=False)

Bases: object

An object recording exception infomation under trace entity cause section. The information includes the stack trace, working directory and message from the original exception.

aws_xray_sdk.core.models.trace_header module

class aws_xray_sdk.core.models.trace_header.TraceHeader(root=None, parent=None, sampled=None, data=None)

Bases: object

The sampling decision and trace ID are added to HTTP requests in tracing headers named X-Amzn-Trace-Id. The first X-Ray-integrated service that the request hits adds a tracing header, which is read by the X-Ray SDK and included in the response. Learn more about Tracing Header.

property data

Return the arbitrary fields in the trace header.

classmethod from_header_str(header)

Create a TraceHeader object from a tracing header string extracted from a http request headers.

property parent

Return the parent segment id in the header

property root

Return trace id of the header

property sampled

Return the sampling decision in the header. It’s 0 or 1 or ‘?’.

to_header_str()

Convert to a tracing header string that can be injected to outgoing http request headers.

aws_xray_sdk.core.models.traceid module

class aws_xray_sdk.core.models.traceid.TraceId

Bases: object

A trace ID tracks the path of a request through your application. A trace collects all the segments generated by a single request. A trace ID is required for a segment.

DELIMITER = '-'

VERSION = '1'

to_id()

Convert TraceId object to a string.

Module contents