tests: filter_multiline: Add test for in_emitter pause by using multi…

…line

This commit will add a test for pause functionality of in_emitter. The test
uses a small emitter buffer size, so the in_emitter will definitely be paused.

Signed-off-by: Richard Treu <richard.treu@sap.com>

tests/runtime/filter_multiline.c

@@ -2,6 +2,7 @@
 
 #include <fluent-bit.h>
 #include <fluent-bit/flb_sds.h>
+#include <fluent-bit/flb_time.h>
 #include "flb_tests_runtime.h"
 
 struct filter_test {
@@ -120,7 +121,34 @@ static int cb_check_str_list(void *record, size_t size, void *data)
     return 0;
 }
 
+void wait_with_timeout(uint32_t timeout_ms, int *output_num, int expected)
+{
+    struct flb_time start_time;
+    struct flb_time end_time;
+    struct flb_time diff_time;
+    uint64_t elapsed_time_flb = 0;
+
+    flb_time_get(&start_time);
+
+    while (true) {
+        *output_num = get_output_num();
+
+        if (*output_num == expected) {
+            break;
+        }
+
+        flb_time_msleep(100);
+        flb_time_get(&end_time);
+        flb_time_diff(&end_time, &start_time, &diff_time);
+        elapsed_time_flb = flb_time_to_nanosec(&diff_time) / 1000000;
 
+        if (elapsed_time_flb > timeout_ms) {
+            flb_warn("[timeout] elapsed_time: %ld", elapsed_time_flb);
+            // Reached timeout.
+            break;
+        }
+    }
+}
 
 static struct filter_test *filter_test_create(struct flb_lib_out_cb *data)
 {
@@ -682,6 +710,100 @@ static void flb_test_ml_buffered_16_streams()
     filter_test_destroy(ctx);
 }
 
+/* This test will test the pausing of in_emitter */
+static void flb_test_ml_buffered_16_streams_pausing()
+{
+    struct flb_lib_out_cb cb_data;
+    struct filter_test *ctx;
+    int i_ffds[16] = {0};
+    int ffd_num = sizeof(i_ffds)/sizeof(int);
+    int ret;
+    int i;
+    int j;
+    int bytes;
+    int len;
+    char line_buf[2048] = {0};
+    char tag_buf[32] = {0};
+    int line_num;
+    int num;
+
+    char *expected_strs[] = {"Exception in thread main java.lang.IllegalStateException: ..null property\\n     at com.example.myproject.Author.getBookIds(xx.java:38)\\n     at com.example.myproject.Bootstrap.main(Bootstrap.java:14)\\nCaused by: java.lang.NullPointerException\\n     at com.example.myproject.Book.getId(Book.java:22)\\n     at com.example.myproject.Author.getBookIds(Author.java:35)\\n     ... 1 more"};
+
+    struct str_list expected = {
+                                .size = sizeof(expected_strs)/sizeof(char*),
+                                .lists = &expected_strs[0],
+                                .ignore_min_line_num = 64,
+    };
+
+    char *ml_logs[] = {"Exception in thread main java.lang.IllegalStateException: ..null property",
+                       "     at com.example.myproject.Author.getBookIds(xx.java:38)",
+                       "     at com.example.myproject.Bootstrap.main(Bootstrap.java:14)",
+                       "Caused by: java.lang.NullPointerException",
+                       "     at com.example.myproject.Book.getId(Book.java:22)",
+                       "     at com.example.myproject.Author.getBookIds(Author.java:35)",
+                       "     ... 1 more",
+                       "single line"};
+
+    cb_data.cb = cb_check_str_list;
+    cb_data.data = (void *)&expected;
+
+    clear_output_num();
+
+    line_num = sizeof(ml_logs)/sizeof(char*);
+
+    /* Create test context */
+    ctx = filter_test_create((void *) &cb_data);
+    if (!ctx) {
+        exit(EXIT_FAILURE);
+    }
+    flb_service_set(ctx->flb,
+                    "Flush", "0.100000000",
+                    "Grace", "2",
+                    NULL);
+
+    i_ffds[0] = ctx->i_ffd;
+    for (i=1; i<ffd_num; i++) {
+        i_ffds[i] = flb_input(ctx->flb, (char *) "lib", NULL);
+        TEST_CHECK(i_ffds[i] >= 0);
+        sprintf(&tag_buf[0], "test%d", i);
+        flb_input_set(ctx->flb, i_ffds[i], "tag", tag_buf, NULL);
+    }
+
+    /* Configure filter */
+    /* Set mem_buf_limit small, so in_emitter will be paused */
+    ret = flb_filter_set(ctx->flb, ctx->f_ffd,
+                         "multiline.key_content", "log",
+                         "multiline.parser", "java",
+                         "buffer", "on",
+                         "debug_flush", "on",
+                         "emitter_mem_buf_limit", "1k",
+                         NULL);
+    TEST_CHECK(ret == 0);
+
+
+    /* Start the engine */
+    ret = flb_start(ctx->flb);
+    TEST_CHECK(ret == 0);
+
+    for (i=0; i<line_num; i++) {
+        sprintf(&line_buf[0], "[%d, {\"log\":\"%s\"}]", i, ml_logs[i]);
+        len = strlen(line_buf);
+        for (j=0; j<ffd_num; j++)  {
+            bytes = flb_lib_push(ctx->flb, i_ffds[j], &line_buf[0], len);
+            TEST_CHECK(bytes == len);
+        }
+    }
+    wait_with_timeout(20000, &num, ffd_num);
+
+    if (!TEST_CHECK(num > 0))  {
+        TEST_MSG("output error. got %d expect more than 0 records.", num);
+        /* The internal flb_lib_push cannot be paused, so records may be lost */
+        /* However, there should be at least some records */
+    }
+
+    filter_test_destroy(ctx);
+}
+
 
 
 
@@ -695,5 +817,7 @@ TEST_LIST = {
 
     {"flb_test_multiline_partial_message_concat"          , flb_test_multiline_partial_message_concat },
     {"flb_test_multiline_partial_message_concat_two_ids"  , flb_test_multiline_partial_message_concat_two_ids },
+
+    {"ml_buffered_16_streams_pausing" , flb_test_ml_buffered_16_streams_pausing },
     {NULL, NULL}
 };