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support sampled flag

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Corentin Leruth 2025-01-30 16:51:24 +01:00 • committed by Simon Cruanes
parent f604f0b876
commit 4f9247d6d0
1 changed files with 15 additions and 10 deletions
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25
src/core/opentelemetry.ml
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@ -407,7 +407,8 @@ end
module Span_ctx : sig
type t
val make : trace_id:Trace_id.t -> parent_id:Span_id.t -> unit -> t
val make :
?sampled:bool -> trace_id:Trace_id.t -> parent_id:Span_id.t -> unit -> t
val dummy : t
(** Invalid span context, to be used as a placeholder *)
@ -418,7 +419,7 @@ module Span_ctx : sig
val parent_id : t -> Span_id.t
val is_remote : t -> bool
val sampled : t -> bool
val to_w3c_trace_context : t -> bytes
@ -427,25 +428,24 @@ module Span_ctx : sig
val of_w3c_trace_context_exn : bytes -> t
(** @raise Invalid_argument if parsing failed *)
end = struct
(* TODO: trace flags *)
(* TODO: trace state *)
type t = {
trace_id: Trace_id.t;
parent_id: Span_id.t;
is_remote: bool;
sampled: bool;
}
let dummy =
{ trace_id = Trace_id.dummy; parent_id = Span_id.dummy; is_remote = false }
{ trace_id = Trace_id.dummy; parent_id = Span_id.dummy; sampled = false }
let make ~trace_id ~parent_id () : t =
{ trace_id; parent_id; is_remote = false }
let make ?(sampled = false) ~trace_id ~parent_id () : t =
{ trace_id; parent_id; sampled }
let[@inline] is_valid self =
Trace_id.is_valid self.trace_id && Span_id.is_valid self.parent_id
let[@inline] is_remote self = self.is_remote
let[@inline] sampled self = self.sampled
let[@inline] trace_id self = self.trace_id
@ -463,7 +463,11 @@ end = struct
(* +16 *)
Bytes.set bs 52 '-';
Bytes.set bs 53 '0';
Bytes.set bs 54 '0';
Bytes.set bs 54
(if self.sampled then
'1'
else
'0');
bs
let of_w3c_trace_context bs : _ result =
@ -485,9 +489,10 @@ end = struct
with Invalid_argument msg -> invalid_arg (spf "in span id: %s" msg)
in
if Bytes.get bs 52 <> '-' then invalid_arg "expected '-' after parent_id";
let sampled = int_of_string_opt (Bytes.sub_string bs 53 55) = Some 1 in
(* ignore flags *)
Ok { trace_id; parent_id; is_remote = true }
Ok { trace_id; parent_id; sampled }
with Invalid_argument msg -> Error msg
let of_w3c_trace_context_exn bs =