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TD-855: Add new versions of helpers #33

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43 changes: 32 additions & 11 deletions src/woody_util.erl
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Original file line number Diff line number Diff line change
Expand Up @@ -11,11 +11,24 @@

-define(DEFAULT_HANDLER_OPTS, undefined).

%%
%% OTEL

-export([span_stack_put/3]).
-export([span_stack_put/4]).
-export([span_stack_get/3]).
-export([span_stack_get/4]).
-export([span_stack_pop/2]).
-export([span_stack_pop/3]).

-define(OTEL_SPANS_STACK, 'spans_ctx_stack').

-type stack_key() :: term().
-type span_key() :: atom() | binary() | string().
-type maybe_span_ctx() :: opentelemetry:span_ctx() | undefined.

-export_type([stack_key/0]).
-export_type([span_key/0]).
-export_type([maybe_span_ctx/0]).

%%
%% Internal API
Expand Down Expand Up @@ -63,20 +76,23 @@ get_rpc_reply_type(_) -> call.
%% woody client (or server) calls _inside_ one single process context.
%% Thus, use of process dictionary via `otel_ctx'.

-define(OTEL_SPANS_STACK, 'spans_ctx_stack').

-type span_key() :: atom() | binary() | string().
-type maybe_span_ctx() :: opentelemetry:span_ctx() | undefined.

-spec span_stack_put(span_key(), opentelemetry:span_ctx(), otel_ctx:t()) -> otel_ctx:t().
span_stack_put(Key, SpanCtx, Context) ->
Stack = otel_ctx:get_value(Context, ?OTEL_SPANS_STACK, []),
span_stack_put(Key, SpanCtx, Context, ?OTEL_SPANS_STACK).

-spec span_stack_put(span_key(), opentelemetry:span_ctx(), otel_ctx:t(), stack_key()) -> otel_ctx:t().
span_stack_put(Key, SpanCtx, Context, StackKey) ->
Stack = otel_ctx:get_value(Context, StackKey, []),
Entry = {Key, SpanCtx, otel_tracer:current_span_ctx(Context)},
otel_ctx:set_value(Context, ?OTEL_SPANS_STACK, [Entry | Stack]).
otel_ctx:set_value(Context, StackKey, [Entry | Stack]).

-spec span_stack_get(span_key(), otel_ctx:t(), maybe_span_ctx()) -> maybe_span_ctx().
span_stack_get(Key, Context, Default) ->
Stack = otel_ctx:get_value(Context, ?OTEL_SPANS_STACK, []),
span_stack_get(Key, Context, Default, ?OTEL_SPANS_STACK).

-spec span_stack_get(span_key(), otel_ctx:t(), maybe_span_ctx(), stack_key()) -> maybe_span_ctx().
span_stack_get(Key, Context, Default, StackKey) ->
Stack = otel_ctx:get_value(Context, StackKey, []),
case lists:keyfind(Key, 1, Stack) of
false ->
Default;
Expand All @@ -87,11 +103,16 @@ span_stack_get(Key, Context, Default) ->
-spec span_stack_pop(span_key(), otel_ctx:t()) ->
{ok, opentelemetry:span_ctx(), maybe_span_ctx(), otel_ctx:t()} | {error, notfound}.
span_stack_pop(Key, Context) ->
Stack = otel_ctx:get_value(Context, ?OTEL_SPANS_STACK, []),
span_stack_pop(Key, Context, ?OTEL_SPANS_STACK).

-spec span_stack_pop(span_key(), otel_ctx:t(), stack_key()) ->
{ok, opentelemetry:span_ctx(), maybe_span_ctx(), otel_ctx:t()} | {error, notfound}.
span_stack_pop(Key, Context, StackKey) ->
Stack = otel_ctx:get_value(Context, StackKey, []),
case lists:keytake(Key, 1, Stack) of
false ->
{error, notfound};
{value, {_Key, SpanCtx, ParentSpanCtx}, Stack1} ->
Context1 = otel_ctx:set_value(Context, ?OTEL_SPANS_STACK, Stack1),
Context1 = otel_ctx:set_value(Context, StackKey, Stack1),
{ok, SpanCtx, ParentSpanCtx, Context1}
end.