processor_metrics_selector: Add test case for delete_label_value operation

Signed-off-by: Hiroshi Hatake <[email protected]>

Author: cosmo0920

tests/runtime/processor_metrics_selector.c

@@ -613,6 +613,82 @@ void flb_test_selector_can_modify_output(void)
     flb_stop(ctx);
     flb_destroy(ctx);
 }
+
+
+void flb_test_selector_context_delete_label_value(void)
+{
+    int ret;
+    flb_ctx_t *ctx;
+    int in_ffd;
+    int out_ffd;
+    struct flb_processor *proc;
+    struct flb_processor_unit *pu;
+    struct cfl_variant var = {
+        .type = CFL_VARIANT_STRING,
+        .data.as_string = "delete_label_value",
+    };
+    struct cfl_variant label_pair = {
+        .type = CFL_VARIANT_STRING,
+        .data.as_string = "name lib.0",
+    };
+    int got;
+    int n_metrics = 20;
+    int not_used = 0;
+    struct flb_lib_out_cb cb_data;
+
+    /* Prepare output callback with expected result */
+    cb_data.cb = cb_count_metrics_msgpack;
+    cb_data.data = &not_used;
+
+    ctx = flb_create();
+    flb_service_set(ctx,
+                    "Flush", "0.200000000",
+                    "Grace", "2",
+                    NULL);
+
+    proc = flb_processor_create(ctx->config, "unit_test", NULL, 0);
+    TEST_CHECK(proc != NULL);
+
+    pu = flb_processor_unit_create(proc, FLB_PROCESSOR_METRICS, "metrics_selector");
+    TEST_CHECK(pu != NULL);
+    ret = flb_processor_unit_set_property(pu, "context", &var);
+    TEST_CHECK(ret == 0);
+    ret = flb_processor_unit_set_property(pu, "label", &label_pair);
+    TEST_CHECK(ret == 0);
+
+    /* Input */
+    in_ffd = flb_input(ctx, (char *) "fluentbit_metrics", NULL);
+    TEST_CHECK(in_ffd >= 0);
+    ret = flb_input_set(ctx, in_ffd, "tag", "test", NULL);
+    TEST_CHECK(ret == 0);
+    ret = flb_input_set(ctx, in_ffd, "scrape_on_start", "true", NULL);
+    TEST_CHECK(ret == 0);
+    ret = flb_input_set(ctx, in_ffd, "scrape_interval", "1", NULL);
+    TEST_CHECK(ret == 0);
+
+    /* set up processor */
+    ret = flb_input_set_processor(ctx, in_ffd, proc);
+    TEST_CHECK(ret == 0);
+
+    out_ffd = flb_output(ctx, (char *) "lib", &cb_data);
+    TEST_CHECK(out_ffd >= 0);
+    flb_output_set(ctx, out_ffd, "match", "test", NULL);
+
+    clear_output_num();
+
+    ret = flb_start(ctx);
+    TEST_CHECK(ret == 0);
+
+    flb_time_msleep(1500); /* waiting flush */
+
+    got = get_output_num();
+    if (!TEST_CHECK(got >= n_metrics)) {
+        TEST_MSG("expect: %d >= %d, got: %d < %d", got, n_metrics, got, n_metrics);
+    }
+
+    flb_stop(ctx);
+    flb_destroy(ctx);
+}
 #endif
 
 /* Test list */
@@ -625,6 +701,7 @@ TEST_LIST = {
     {"substring_include", flb_test_selector_substring_include},
     {"substring_exclude", flb_test_selector_substring_exclude},
     {"can_modify_output", flb_test_selector_can_modify_output},
+    {"context_delete_label_value", flb_test_selector_context_delete_label_value},
 #endif
     {NULL, NULL}
 };