added sampling context

include/sentry.h

@@ -1533,7 +1533,9 @@ SENTRY_EXPERIMENTAL_API void sentry_options_set_traces_sample_rate(
 SENTRY_EXPERIMENTAL_API double sentry_options_get_traces_sample_rate(
     sentry_options_t *opts);
 
-typedef double (*sentry_traces_sampler_function)(sentry_value_t *sampling_ctx);
+struct sentry_sampling_context_s;
+typedef struct sentry_sampling_context_s sentry_sampling_context_t;
+typedef double (*sentry_traces_sampler_function)(sentry_sampling_context_t *sampling_ctx);
 
 /**
  * Sets the traces sampler callback. Should be a function that returns a double

src/CMakeLists.txt

@@ -24,6 +24,8 @@ sentry_target_sources_cwd(sentry
 	sentry_random.h
 	sentry_ratelimiter.c
 	sentry_ratelimiter.h
+	sentry_sampling_context.c
+	sentry_sampling_context.h
 	sentry_scope.c
 	sentry_scope.h
 	sentry_session.c

src/sentry_sampling_context.c

@@ -0,0 +1,21 @@
+// sentry_sampling_context.c
+#include "sentry_sampling_context.h"
+#include <sentry_alloc.h>
+#include <stdlib.h>
+
+sentry_sampling_context_t *sentry_sampling_context_new(sentry_transaction_context_t *transaction_context) {
+    sentry_sampling_context_t *context = SENTRY_MAKE(sentry_sampling_context_t);
+    if (context) {
+        context->transaction_context = transaction_context; // todo incref?
+        context->custom_sampling_context = NULL;
+    }
+    return context;
+}
+
+sentry_sampling_context_t *sentry_sampling_context_new_with_custom(sentry_transaction_context_t *transaction_context, void *custom_sampling_context) {
+    sentry_sampling_context_t *context = sentry_sampling_context_new(transaction_context);
+    if (context) {
+        context->custom_sampling_context = custom_sampling_context;
+    }
+    return context;
+}

src/sentry_sampling_context.h

@@ -0,0 +1,16 @@
+// sentry_sampling_context.h
+#ifndef SENTRY_SAMPLING_CONTEXT_H_INCLUDED
+#define SENTRY_SAMPLING_CONTEXT_H_INCLUDED
+
+#include "sentry_tracing.h"
+
+typedef struct sentry_sampling_context_s {
+    sentry_transaction_context_t *transaction_context;
+    void *custom_sampling_context; // TODO what type should this be?
+} sentry_sampling_context_t;
+
+// TODO add refcounting for this; users might want to reuse this
+sentry_sampling_context_t *sentry_sampling_context_new(sentry_transaction_context_t *transaction_context);
+sentry_sampling_context_t *sentry_sampling_context_new_with_custom(sentry_transaction_context_t *transaction_context, void *custom_sampling_context);
+
+#endif // SENTRY_SAMPLING_CONTEXT_H_INCLUDED