1 files changed, 115 insertions, 0 deletions
diff --git a/src/fluent-bit/plugins/in_node_exporter_metrics/ne_filefd_linux.c b/src/fluent-bit/plugins/in_node_exporter_metrics/ne_filefd_linux.c
new file mode 100644
index 000000000..5c0c0166d
--- /dev/null
+++ b/src/fluent-bit/plugins/in_node_exporter_metrics/ne_filefd_linux.c
@@ -0,0 +1,115 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  Fluent Bit
+ *  ==========
+ *  Copyright (C) 2015-2022 The Fluent Bit Authors
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#define _GNU_SOURCE
+
+#include <fluent-bit/flb_info.h>
+#include <fluent-bit/flb_input_plugin.h>
+
+#include "ne.h"
+#include "ne_utils.h"
+
+static int filefd_configure(struct flb_ne *ctx)
+{
+    struct cmt_gauge *g;
+
+    /* node_filefd_allocated */
+    g = cmt_gauge_create(ctx->cmt, "node", "filefd", "allocated",
+                         "File descriptor statistics: allocated.",
+                         0, NULL);
+    ctx->filefd_allocated = g;
+
+    /* node_filefd_maximum */
+    g = cmt_gauge_create(ctx->cmt, "node", "filefd", "maximum",
+                         "File descriptor statistics: maximum.",
+                         0, NULL);
+    ctx->filefd_maximum = g;
+
+    return 0;
+}
+
+static int filefd_update(struct flb_ne *ctx)
+{
+    int ret;
+    int parts;
+    uint64_t ts;
+    double d_val;
+    struct mk_list *head;
+    struct mk_list list;
+    struct mk_list split_list;
+    struct flb_slist_entry *line;
+    struct flb_slist_entry *alloc;
+    struct flb_slist_entry *max;
+
+    mk_list_init(&list);
+    ret = ne_utils_file_read_lines(ctx->path_procfs, "/sys/fs/file-nr", &list);
+    if (ret == -1) {
+        return -1;
+    }
+
+    ts = cfl_time_now();
+
+    mk_list_foreach(head, &list) {
+        line = mk_list_entry(head, struct flb_slist_entry, _head);
+
+        mk_list_init(&split_list);
+        ret = flb_slist_split_string(&split_list, line->str, '\t', -1);
+        if (ret == -1) {
+            continue;
+        }
+        parts = ret;
+        if (parts == 0) {
+            flb_slist_destroy(&split_list);
+            continue;
+        }
+        else if (parts != 3) {
+            flb_plg_warn(ctx->ins, "/sys/fs/file-nr: invalid number of fields");
+            flb_slist_destroy(&split_list);
+            break;
+        }
+
+        /* allocated (0) */
+        alloc = flb_slist_entry_get(&split_list, 0);
+        ne_utils_str_to_double(alloc->str, &d_val);
+        cmt_gauge_set(ctx->filefd_allocated, ts, d_val, 0, NULL);
+
+        /* maximum (2) */
+        max = flb_slist_entry_get(&split_list, 2);
+        ne_utils_str_to_double(max->str, &d_val);
+        cmt_gauge_set(ctx->filefd_maximum, ts, d_val, 0, NULL);
+
+        flb_slist_destroy(&split_list);
+        break;
+    }
+    flb_slist_destroy(&list);
+
+    return 0;
+}
+
+int ne_filefd_init(struct flb_ne *ctx)
+{
+    filefd_configure(ctx);
+    return 0;
+}
+
+int ne_filefd_update(struct flb_ne *ctx)
+{
+    filefd_update(ctx);
+    return 0;
+}