1 files changed, 320 insertions, 0 deletions
diff --git a/src/fluent-bit/plugins/in_mem/mem.c b/src/fluent-bit/plugins/in_mem/mem.c
new file mode 100644
index 000000000..391ba6144
--- /dev/null
+++ b/src/fluent-bit/plugins/in_mem/mem.c
@@ -0,0 +1,320 @@
+/* -*- 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.
+ */
+
+#include <fluent-bit/flb_info.h>
+#include <fluent-bit/flb_input.h>
+#include <fluent-bit/flb_input_plugin.h>
+#include <fluent-bit/flb_log_event.h>
+#include <fluent-bit/flb_kernel.h>
+#include <fluent-bit/flb_pack.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/sysinfo.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include "mem.h"
+#include "proc.h"
+
+struct flb_input_plugin in_mem_plugin;
+
+static int in_mem_collect(struct flb_input_instance *i_ins,
+                          struct flb_config *config, void *in_context);
+#if 0
+/* Locate a specific key into the buffer */
+static char *field(char *data, char *field)
+{
+    char *p;
+    char *q;
+    char *sep;
+    char *value;
+    int len = strlen(field);
+
+    p = strstr(data, field);
+    if (!p) {
+        return NULL;
+    }
+
+    sep = strchr(p, ':');
+    p = ++sep;
+    p++;
+
+    while (*p == ' ') p++;
+
+    q = strchr(p, ' ');
+    len = q - p;
+    value = flb_malloc(len + 1);
+    strncpy(value, p, len);
+    value[len] = '\0';
+
+    return value;
+}
+#endif
+
+static uint64_t calc_kb(unsigned long amount, unsigned int unit)
+{
+    unsigned long long bytes = amount;
+
+    /*
+     * Recent Linux versions return memory/swap sizes as multiples
+     * of a certain size unit. See sysinfo(2) for details.
+     */
+    if (unit > 1) {
+        bytes = bytes * unit;
+    }
+
+    bytes = bytes / 1024;
+
+    return (uint64_t) bytes;
+}
+
+static int mem_calc(struct flb_in_mem_info *m_info)
+{
+    int ret;
+    struct sysinfo info;
+
+    ret = sysinfo(&info);
+    if (ret == -1) {
+        flb_errno();
+        return -1;
+    }
+
+    /* set values in KBs */
+    m_info->mem_total     = calc_kb(info.totalram, info.mem_unit);
+
+    /*
+     * This value seems to be MemAvailable if it is supported
+     * or MemFree on legacy Linux.
+     */
+    m_info->mem_free      = calc_kb(info.freeram, info.mem_unit);
+
+    m_info->mem_used      = m_info->mem_total - m_info->mem_free;
+
+    m_info->swap_total    = calc_kb(info.totalswap, info.mem_unit);
+    m_info->swap_free     = calc_kb(info.freeswap, info.mem_unit);
+    m_info->swap_used     = m_info->swap_total - m_info->swap_free;
+
+    return 0;
+}
+
+static int in_mem_init(struct flb_input_instance *in,
+                       struct flb_config *config, void *data)
+{
+    int ret;
+    struct flb_in_mem_config *ctx;
+    (void) data;
+
+    /* Initialize context */
+    ctx = flb_malloc(sizeof(struct flb_in_mem_config));
+    if (!ctx) {
+        return -1;
+    }
+    ctx->idx = 0;
+    ctx->pid = 0;
+    ctx->page_size = sysconf(_SC_PAGESIZE);
+    ctx->ins = in;
+    
+    /* Load the config map */
+    ret = flb_input_config_map_set(in, (void *)ctx);
+    if (ret == -1) {
+        flb_free(ctx);
+        return -1;
+    }
+
+    /* Collection time setting */
+    if (ctx->interval_sec <= 0) {
+        ctx->interval_sec = atoi(DEFAULT_INTERVAL_SEC);
+    }
+    if (ctx->interval_nsec <= 0) {
+        ctx->interval_nsec = atoi(DEFAULT_INTERVAL_NSEC);
+    }
+
+    /* Set the context */
+    flb_input_set_context(in, ctx);
+
+    /* Set the collector */
+    ret = flb_input_set_collector_time(in,
+                                       in_mem_collect,
+                                       ctx->interval_sec,
+                                       ctx->interval_nsec,
+                                       config);
+    if (ret == -1) {
+        flb_plg_error(ctx->ins, "could not set collector for memory input plugin");
+        return -1;
+    }
+
+    ret = flb_log_event_encoder_init(&ctx->log_encoder,
+                                     FLB_LOG_EVENT_FORMAT_DEFAULT);
+
+    if (ret != FLB_EVENT_ENCODER_SUCCESS) {
+        flb_plg_error(ctx->ins, "error initializing event encoder : %d", ret);
+
+        return -1;
+    }
+
+    return 0;
+}
+
+static int in_mem_collect(struct flb_input_instance *i_ins,
+                          struct flb_config *config, void *in_context)
+{
+    int ret;
+    struct proc_task *task = NULL;
+    struct flb_in_mem_config *ctx = in_context;
+    struct flb_in_mem_info info;
+
+    if (ctx->pid) {
+        task = proc_stat(ctx->pid, ctx->page_size);
+        if (!task) {
+            flb_plg_warn(ctx->ins, "could not measure PID %i", ctx->pid);
+            ctx->pid = 0;
+        }
+    }
+
+    ret = mem_calc(&info);
+
+    if (ret == -1) {
+        if (task) {
+            proc_free(task);
+        }
+        return -1;
+    }
+
+    ret = flb_log_event_encoder_begin_record(&ctx->log_encoder);
+
+    if (ret == FLB_EVENT_ENCODER_SUCCESS) {
+        ret = flb_log_event_encoder_set_current_timestamp(
+                &ctx->log_encoder);
+    }
+
+    if (ret == FLB_EVENT_ENCODER_SUCCESS) {
+        ret = flb_log_event_encoder_append_body_values(
+                &ctx->log_encoder,
+                FLB_LOG_EVENT_CSTRING_VALUE("Mem.total"),
+                FLB_LOG_EVENT_UINT64_VALUE(info.mem_total),
+
+                FLB_LOG_EVENT_CSTRING_VALUE("Mem.used"),
+                FLB_LOG_EVENT_UINT64_VALUE(info.mem_used),
+
+                FLB_LOG_EVENT_CSTRING_VALUE("Mem.free"),
+                FLB_LOG_EVENT_UINT64_VALUE(info.mem_free),
+
+                FLB_LOG_EVENT_CSTRING_VALUE("Swap.total"),
+                FLB_LOG_EVENT_UINT64_VALUE(info.swap_total),
+
+                FLB_LOG_EVENT_CSTRING_VALUE("Swap.used"),
+                FLB_LOG_EVENT_UINT64_VALUE(info.swap_used),
+
+                FLB_LOG_EVENT_CSTRING_VALUE("Swap.free"),
+                FLB_LOG_EVENT_UINT64_VALUE(info.swap_free));
+    }
+
+    if (task != NULL &&
+        ret == FLB_EVENT_ENCODER_SUCCESS) {
+        /* RSS bytes */
+
+        ret = flb_log_event_encoder_append_body_values(
+                &ctx->log_encoder,
+                FLB_LOG_EVENT_CSTRING_VALUE("proc_bytes"),
+                FLB_LOG_EVENT_UINT64_VALUE(task->proc_rss),
+
+                FLB_LOG_EVENT_CSTRING_VALUE("proc_hr"),
+                FLB_LOG_EVENT_UINT64_VALUE(task->proc_rss_hr));
+
+        proc_free(task);
+    }
+
+    flb_plg_trace(ctx->ins, "memory total=%lu kb, used=%lu kb, free=%lu kb",
+                  info.mem_total, info.mem_used, info.mem_free);
+    flb_plg_trace(ctx->ins, "swap total=%lu kb, used=%lu kb, free=%lu kb",
+                  info.swap_total, info.swap_used, info.swap_free);
+    ++ctx->idx;
+
+    if (ret == FLB_EVENT_ENCODER_SUCCESS) {
+        ret = flb_log_event_encoder_commit_record(&ctx->log_encoder);
+    }
+
+    if (ret == FLB_EVENT_ENCODER_SUCCESS) {
+        flb_input_log_append(i_ins, NULL, 0,
+                             ctx->log_encoder.output_buffer,
+                             ctx->log_encoder.output_length);
+
+        ret = 0;
+    }
+    else {
+        flb_plg_error(i_ins, "Error encoding record : %d", ret);
+
+        ret = -1;
+    }
+
+    flb_log_event_encoder_reset(&ctx->log_encoder);
+
+    return 0;
+}
+
+static int in_mem_exit(void *data, struct flb_config *config)
+{
+    (void) *config;
+    struct flb_in_mem_config *ctx = data;
+
+    if (!ctx) {
+        return 0;
+    }
+
+    flb_log_event_encoder_destroy(&ctx->log_encoder);
+
+    /* done */
+    flb_free(ctx);
+
+    return 0;
+}
+
+static struct flb_config_map config_map[] = {
+    {
+      FLB_CONFIG_MAP_INT, "interval_sec", DEFAULT_INTERVAL_SEC,
+      0, FLB_TRUE, offsetof(struct flb_in_mem_config, interval_sec),
+      "Set the collector interval"
+    },
+    {
+      FLB_CONFIG_MAP_INT, "interval_nsec", DEFAULT_INTERVAL_NSEC,
+      0, FLB_TRUE, offsetof(struct flb_in_mem_config, interval_nsec),
+      "Set the collector interval (subseconds)"
+    },
+    {
+      FLB_CONFIG_MAP_INT, "pid", "0",
+      0, FLB_TRUE, offsetof(struct flb_in_mem_config, pid),
+      "Set the PID of the process to measure"
+    },
+    /* EOF */
+    {0}
+};
+
+struct flb_input_plugin in_mem_plugin = {
+    .name         = "mem",
+    .description  = "Memory Usage",
+    .cb_init      = in_mem_init,
+    .cb_pre_run   = NULL,
+    .cb_collect   = in_mem_collect,
+    .cb_flush_buf = NULL,
+    .cb_exit      = in_mem_exit,
+    .config_map   = config_map
+};