Revert "Add lambda function url trigger and inferred span (#197)" (#198)

* Revert "Add lambda function url trigger and inferred span (#197)"

This reverts commit 117474f.

* Remove spurrious lines from the integration tests

Author: agocs

datadog_lambda/tracing.py

@@ -13,7 +13,6 @@
     TraceContextSource,
     XrayDaemon,
 )
-from datadog_lambda.trigger import parse_event_source, EventTypes
 from datadog_lambda.xray import (
     send_segment,
     parse_xray_header,
@@ -378,62 +377,13 @@ def set_dd_trace_py_root(trace_context_source, merge_xray_traces):
         )
 
 
-def create_inferred_span(event, context, make_inferred_spans):
-    event_source = parse_event_source(event)
-    try:
-        if event_source.equals(EventTypes.LAMBDA_FUNCTION_URL):
-            logger.debug("Function URL event detected. Inferring a span")
-            return create_inferred_span_from_lambda_function_url_event(event, context)
-        if not make_inferred_spans:
-            return None
-        # the rest of the inferred span logic goes here
-    except Exception as e:
-        logger.debug(
-            "Unable to infer span. Detected type: {}. Reason: {}",
-            event_source.to_string(),
-            e,
-        )
-        return None
-    logger.debug("Unable to infer a span: unknown event type")
-    return None
-
-
-def create_inferred_span_from_lambda_function_url_event(event, context):
-    domain = event["requestContext"]["domainName"]
-    path = event["rawPath"]
-    tags = {
-        "operation_name": "aws.lambda.url",
-        "http.url": domain + path,
-        "endpoint": path,
-        "http.method": event["requestContext"]["http"]["method"],
-        "resource_names": domain + path,
-        "request_id": context.aws_request_id,
-        "service": "aws.lambda",
-    }
-    request_time_epoch = event["requestContext"]["timeEpoch"]
-    args = {
-        "resource": domain + path,
-        "span_type": "http",
-    }
-    tracer.set_tags(
-        {"_dd.origin": "lambda"}
-    )  # function urls don't count as lambda_inferred,
-    # because they're in the same service as the inferring lambda function
-    span = tracer.trace("aws.lambda.url", **args)
-    if span:
-        span.set_tags(tags)
-    span.start = request_time_epoch / 1000
-    return span
-
-
 def create_function_execution_span(
     context,
     function_name,
     is_cold_start,
     trace_context_source,
     merge_xray_traces,
     trigger_tags,
-    parent_span=None,
 ):
     tags = {}
     if context:
@@ -465,6 +415,4 @@ def create_function_execution_span(
     span = tracer.trace("aws.lambda", **args)
     if span:
         span.set_tags(tags)
-    if parent_span:
-        span.parent_id = parent_span.span_id
     return span