diff options
Diffstat (limited to 'src/fluent-bit/lib/ctraces/examples/simple-c-api.c')
| -rw-r--r-- | src/fluent-bit/lib/ctraces/examples/simple-c-api.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/src/fluent-bit/lib/ctraces/examples/simple-c-api.c b/src/fluent-bit/lib/ctraces/examples/simple-c-api.c new file mode 100644 index 000000000..aeaeff120 --- /dev/null +++ b/src/fluent-bit/lib/ctraces/examples/simple-c-api.c @@ -0,0 +1,160 @@ +/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ + +#include <ctraces/ctraces.h> +#include <unistd.h> + +int main() +{ + char *text; + struct ctrace *ctx; + struct ctrace_opts opts; + struct ctrace_span *span_root; + struct ctrace_span *span_child; + struct ctrace_span_event *event; + struct ctrace_resource_span *resource_span; + struct ctrace_resource *resource; + struct ctrace_scope_span *scope_span; + struct ctrace_instrumentation_scope *instrumentation_scope; + struct ctrace_link *link; + struct ctrace_id *span_id; + struct ctrace_id *trace_id; + struct cfl_array *array; + struct cfl_array *sub_array; + struct cfl_kvlist *kv; + + /* + * create an options context: this is used to initialize a CTrace context only, + * it's not mandatory and you can pass a NULL instead on context creation. + * + * note: not used. + */ + ctr_opts_init(&opts); + + /* ctrace context */ + ctx = ctr_create(&opts); + if (!ctx) { + ctr_opts_exit(&opts); + exit(EXIT_FAILURE); + } + + /* resource span */ + resource_span = ctr_resource_span_create(ctx); + ctr_resource_span_set_schema_url(resource_span, "https://ctraces/resource_span_schema_url"); + + /* create a 'resource' for the 'resource span' in question */ + resource = ctr_resource_span_get_resource(resource_span); + ctr_resource_set_dropped_attr_count(resource, 5); + + /* scope span */ + scope_span = ctr_scope_span_create(resource_span); + ctr_scope_span_set_schema_url(scope_span, "https://ctraces/scope_span_schema_url"); + + /* create an optional instrumentation scope */ + instrumentation_scope = ctr_instrumentation_scope_create("ctrace", "a.b.c", 3, NULL); + ctr_scope_span_set_instrumentation_scope(scope_span, instrumentation_scope); + + /* generate a random trace_id */ + trace_id = ctr_id_create_random(CTR_ID_OTEL_TRACE_SIZE); + + /* generate a random ID for the new span */ + span_id = ctr_id_create_random(CTR_ID_OTEL_SPAN_SIZE); + + /* Create a root span */ + span_root = ctr_span_create(ctx, scope_span, "main", NULL); + if (!span_root) { + ctr_destroy(ctx); + ctr_opts_exit(&opts); + exit(EXIT_FAILURE); + } + + /* assign the random ID */ + ctr_span_set_span_id_with_cid(span_root, span_id); + + /* set random trace_id */ + ctr_span_set_trace_id_with_cid(span_root, trace_id); + + /* add some attributes to the span */ + ctr_span_set_attribute_string(span_root, "agent", "Fluent Bit"); + ctr_span_set_attribute_int64(span_root, "year", 2022); + ctr_span_set_attribute_bool(span_root, "open_source", CTR_TRUE); + ctr_span_set_attribute_double(span_root, "temperature", 25.5); + + /* pack an array: create an array context by using the CFL api */ + array = cfl_array_create(4); + cfl_array_append_string(array, "first"); + cfl_array_append_double(array, 2.0); + cfl_array_append_bool(array, CFL_FALSE); + + sub_array = cfl_array_create(3); + cfl_array_append_double(sub_array, 3.1); + cfl_array_append_double(sub_array, 5.2); + cfl_array_append_double(sub_array, 6.3); + cfl_array_append_array(array, sub_array); + + /* add array to the attribute list */ + ctr_span_set_attribute_array(span_root, "my_array", array); + + /* event: add one event and set attributes to it */ + event = ctr_span_event_add(span_root, "connect to remote server"); + + ctr_span_event_set_attribute_string(event, "syscall 1", "open()"); + ctr_span_event_set_attribute_string(event, "syscall 2", "connect()"); + ctr_span_event_set_attribute_string(event, "syscall 3", "write()"); + + /* add a key/value pair list */ + kv = cfl_kvlist_create(1); + cfl_kvlist_insert_string(kv, "language", "c"); + + ctr_span_set_attribute_kvlist(span_root, "my-list", kv); + + /* create a child span */ + span_child = ctr_span_create(ctx, scope_span, "do-work", span_root); + if (!span_child) { + ctr_destroy(ctx); + ctr_opts_exit(&opts); + exit(EXIT_FAILURE); + } + + /* set trace_id */ + ctr_span_set_trace_id_with_cid(span_child, trace_id); + + /* use span_root ID as parent_span_id */ + ctr_span_set_parent_span_id_with_cid(span_child, span_id); + + /* delete old span id and generate a new one */ + ctr_id_destroy(span_id); + span_id = ctr_id_create_random(CTR_ID_OTEL_SPAN_SIZE); + ctr_span_set_span_id_with_cid(span_child, span_id); + + /* destroy the IDs since is not longer needed */ + ctr_id_destroy(span_id); + ctr_id_destroy(trace_id); + + /* change span kind to client */ + ctr_span_kind_set(span_child, CTRACE_SPAN_CLIENT); + + /* create a Link (no valid IDs of course) */ + trace_id = ctr_id_create_random(CTR_ID_OTEL_TRACE_SIZE); + span_id = ctr_id_create_random(CTR_ID_OTEL_SPAN_SIZE); + + link = ctr_link_create_with_cid(span_child, trace_id, span_id); + ctr_link_set_trace_state(link, "aaabbbccc"); + ctr_link_set_dropped_attr_count(link, 2); + + /* delete IDs */ + ctr_id_destroy(span_id); + ctr_id_destroy(trace_id); + + /* Encode Trace as a readable text */ + text = ctr_encode_text_create(ctx); + printf("%s\n", text); + ctr_encode_text_destroy(text); + + /* destroy the context */ + ctr_destroy(ctx); + + /* exit options (it release resources allocated) */ + ctr_opts_exit(&opts); + + return 0; +} |