Census tags propagation.

2 files changed, 9 insertions, 5 deletions

diff --git a/src/core/census/context.c b/src/core/census/context.c
index cab58b653c..441e328c63 100644
--- a/src/core/census/context.c
+++ b/src/core/census/context.c
@@ -39,6 +39,10 @@
 
 /* Placeholder implementation only. */
 
+census_context* census_context_current(void) {
+  return NULL;
+}
+
 size_t census_context_serialize(const census_context *context, char *buffer,
                                 size_t buf_size) {
   /* TODO(aveitch): implement serialization */
diff --git a/src/core/census/context.h b/src/core/census/context.h
index d9907d4da7..896b4ba6c0 100644
--- a/src/core/census/context.h
+++ b/src/core/census/context.h
@@ -36,14 +36,14 @@
 
 #include <grpc/census.h>
 
+#define GRPC_CENSUS_MAX_ON_THE_WIRE_TAG_BYTES 8 * 1024
+
 /* census_context is the in-memory representation of information needed to
  * maintain tracing, RPC statistics and resource usage information. */
 struct census_context {
-  gpr_uint64 op_id;    /* Operation identifier - unique per-context */
-  gpr_uint64 trace_id; /* Globally unique trace identifier */
-                       /* TODO(aveitch) Add census tags:
-                          const census_tag_set *tags;
-                        */
+  gpr_uint64 op_id;     /* Operation identifier - unique per-context */
+  gpr_uint64 trace_id;  /* Globally unique trace identifier */
+  void* tags;           /* Opaque data structure for Census tags. */
 };
 
 #endif /* GRPC_INTERNAL_CORE_CENSUS_CONTEXT_H */