Module oc_trace

• Description
• Data Types
• Function Index
• Function Details

The main module for working with the span in a current context.

Description

This module provides functions for getting the current span context from a ctx variable, creating new spans, and manipulating the span data for the span in the current context.

Data Types

maybe()

      maybe(T) = T | undefined
      

Function Index

add_link/2	Add a Link to the list of Links in the span.
add_time_event/2	Add an Annotation or MessageEvent to the list of TimeEvents in a span.
add_time_event/3
annotation/2	Create an Annotation.
current_span_ctx/1	Return the current span context in a Ctx or undefined.
finish_span/1	Finish a span, setting the end_time.
from_ctx/1	Return the span context, if it exists, from Ctx.
is_enabled/1	Returns true if trace is enabled.
link/4	Create a Link which can be added to a Span.
message_event/4	Create a MessageEvent.
parent_span_ctx/1
put_attribute/3	Put an attribute (a key/value pair) in the attribute map of a span.
put_attributes/2	Merge a map of attributes with the current attributes of a span.
set_status/3	Set Status.
start_span/2	Create a new span, detached from any context.
start_span/3
with_child_span/2	Create a child span with parent from the current context Ctx.
with_child_span/3
with_span_ctx/2	Set the current span context in a context to SpanCtx.

Function Details

add_link/2

      add_link(Link::opencensus:link(), SpanCtx::maybe(opencensus:span_ctx())) -> boolean()
      

Add a Link to the list of Links in the span. Returns true if the data was successfully updated.

add_time_event/2

      add_time_event(TimeEvent::opencensus:annotation() | opencensus:message_event(), Span::maybe(opencensus:span_ctx())) -> boolean()
      

Add an Annotation or MessageEvent to the list of TimeEvents in a span. Returns true if the data was successfully updated.

add_time_event/3

      add_time_event(Timestamp::wts:timestamp(), TimeEvent::opencensus:annotation() | opencensus:message_event(), SpanCtx::maybe(opencensus:span_ctx())) -> boolean()
      

annotation/2

      annotation(Description::unicode:unicode_binary(), Attributes::opencensus:attributes()) -> opencensus:annotation()
      

Create an Annotation.

current_span_ctx/1

      current_span_ctx(Ctx::ctx:t()) -> maybe(opencensus:span_ctx())
      

Return the current span context in a Ctx or undefined.

finish_span/1

      finish_span(Span_ctx::maybe(opencensus:span_ctx())) -> boolean()
      

Finish a span, setting the end_time.

from_ctx/1

      from_ctx(Ctx::ctx:t()) -> opencensus:span_ctx()
      

Return the span context, if it exists, from Ctx.

is_enabled/1

      is_enabled(Span_ctx::maybe(opencensus:span_ctx())) -> boolean()
      

Returns true if trace is enabled.

link/4

      link(LinkType::opencensus:link_type(), TraceId::opencensus:trace_id(), SpanId::opencensus:span_id(), Attributes::opencensus:attributes()) -> opencensus:link()
      

Create a Link which can be added to a Span.

message_event/4

      message_event(MessageEventType::opencensus:message_event_type(), Id::integer(), UncompressedSize::integer(), CompressedSize::integer()) -> opencensus:message_event()
      

Create a MessageEvent.

parent_span_ctx/1

      parent_span_ctx(Span_ctx::maybe(opencensus:span_ctx() | opencensus:span())) -> maybe(opencensus:span_ctx())
      

put_attribute/3

      put_attribute(Key::unicode:unicode_binary(), Value::opencensus:attribute_value(), SpanCtx::maybe(opencensus:span_ctx())) -> boolean()
      

Put an attribute (a key/value pair) in the attribute map of a span. If the attribute already exists it is overwritten with the new value. Returns true if the data was successfully updated.

put_attributes/2

      put_attributes(NewAttributes::#{unicode:unicode_binary() => opencensus:attribute_value()}, SpanCtx::maybe(opencensus:span_ctx())) -> boolean()
      

Merge a map of attributes with the current attributes of a span. The new values overwrite the old if any keys are the same. Returns true if the data was successfully updated.

set_status/3

      set_status(Code::integer(), Message::unicode:unicode_binary(), Span_ctx::maybe(opencensus:span_ctx())) -> boolean()
      

Set Status. Returns true if the data was successfully updated.

start_span/2

start_span(Name, SpanCtx) -> any()

Create a new span, detached from any context.

start_span/3

      start_span(Name, SpanCtx, Options) -> SpanCtx
      

• Name = unicode:unicode_binary()
• SpanCtx = opencensus:span_ctx()
• Options = #{remote_parent => boolean(), sampler => module(), kind => opencensus:span_kind(), attributes => opencensus:attributes()}

with_child_span/2

      with_child_span(Ctx, Name) -> Ctx
      

• Ctx = ctx:t()
• Name = unicode:unicode_binary()

Create a child span with parent from the current context Ctx. And sets it as the current span context in Ctx.

with_child_span/3

      with_child_span(Ctx, Name, Options) -> Ctx
      

• Ctx = ctx:t()
• Name = unicode:unicode_binary()
• Options = #{remote_parent => boolean(), sampler => module(), attributes => opencensus:attributes()}

with_span_ctx/2

      with_span_ctx(Ctx, SpanCtx) -> Ctx
      

• Ctx = ctx:t()
• SpanCtx = opencensus:span_ctx()

Set the current span context in a context to SpanCtx. Or to a new span context with name Name that is the child of the span context in Ctx, if it exists.