7 files changed, 1023 insertions, 0 deletions

diff --git a/fluent-bit/plugins/out_vivo_exporter/CMakeLists.txt b/fluent-bit/plugins/out_vivo_exporter/CMakeLists.txt
new file mode 100644
index 000000000..e458b1ff4
--- /dev/null
+++ b/fluent-bit/plugins/out_vivo_exporter/CMakeLists.txt
@@ -0,0 +1,15 @@
+if(NOT FLB_HTTP_SERVER)
+  message(
+    FATAL_ERROR
+    "Vivo Exporter output plugin requires built-in HTTP Server be enabled:
+     Use -DFLB_HTTP_SERVER=On option to enable it"
+    )
+endif()
+
+set(src
+  vivo_http.c
+  vivo_stream.c
+  vivo.c
+  )
+
+FLB_PLUGIN(out_vivo_exporter "${src}" "")
diff --git a/fluent-bit/plugins/out_vivo_exporter/vivo.c b/fluent-bit/plugins/out_vivo_exporter/vivo.c
new file mode 100644
index 000000000..85e1e0159
--- /dev/null
+++ b/fluent-bit/plugins/out_vivo_exporter/vivo.c
@@ -0,0 +1,343 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  Fluent Bit
+ *  ==========
+ *  Copyright (C) 2015-2023 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_output_plugin.h>
+#include <fluent-bit/flb_kv.h>
+#include <fluent-bit/flb_pack.h>
+#include <fluent-bit/flb_log_event_decoder.h>
+#include <fluent-bit/flb_log_event_encoder.h>
+
+#include "vivo.h"
+#include "vivo_http.h"
+#include "vivo_stream.h"
+
+static flb_sds_t format_logs(struct flb_event_chunk *event_chunk)
+{
+    struct flb_log_event_decoder log_decoder;
+    struct flb_log_event log_event;
+    int result;
+    int i;
+    flb_sds_t out_js;
+    flb_sds_t out_buf = NULL;
+    msgpack_sbuffer tmp_sbuf;
+    msgpack_packer tmp_pck;
+
+    result = flb_log_event_decoder_init(&log_decoder,
+                                        (char *) event_chunk->data,
+                                        event_chunk->size);
+
+    if (result != FLB_EVENT_DECODER_SUCCESS) {
+        return NULL;
+    }
+
+    out_buf = flb_sds_create_size((event_chunk->size * 2) / 4);
+    if (!out_buf) {
+        flb_errno();
+        return NULL;
+    }
+
+    /* Create temporary msgpack buffer */
+    msgpack_sbuffer_init(&tmp_sbuf);
+    msgpack_packer_init(&tmp_pck, &tmp_sbuf, msgpack_sbuffer_write);
+
+    while ((result = flb_log_event_decoder_next(
+                        &log_decoder,
+                        &log_event)) == FLB_EVENT_DECODER_SUCCESS) {
+        /*
+         * If the caller specified FLB_PACK_JSON_DATE_FLUENT, we format the data
+         * by using the following structure:
+         *
+         * [[TIMESTAMP, {"_tag": "...", ...MORE_METADATA}], {RECORD CONTENT}]
+         */
+        msgpack_pack_array(&tmp_pck, 2);
+        msgpack_pack_array(&tmp_pck, 2);
+        msgpack_pack_uint64(&tmp_pck, flb_time_to_nanosec(&log_event.timestamp));
+
+        /* add tag only */
+        msgpack_pack_map(&tmp_pck, 1 + log_event.metadata->via.map.size);
+
+        msgpack_pack_str(&tmp_pck, 4);
+        msgpack_pack_str_body(&tmp_pck, "_tag", 4);
+
+        msgpack_pack_str(&tmp_pck, flb_sds_len(event_chunk->tag));
+        msgpack_pack_str_body(&tmp_pck, event_chunk->tag, flb_sds_len(event_chunk->tag));
+
+        /* Append remaining keys/values */
+        for (i = 0;
+             i < log_event.metadata->via.map.size;
+             i++) {
+            msgpack_pack_object(&tmp_pck,
+                                log_event.metadata->via.map.ptr[i].key);
+            msgpack_pack_object(&tmp_pck,
+                                log_event.metadata->via.map.ptr[i].val);
+        }
+
+        /* pack the remaining content */
+        msgpack_pack_map(&tmp_pck, log_event.body->via.map.size);
+
+        /* Append remaining keys/values */
+        for (i = 0;
+             i < log_event.body->via.map.size;
+             i++) {
+            msgpack_pack_object(&tmp_pck,
+                                log_event.body->via.map.ptr[i].key);
+            msgpack_pack_object(&tmp_pck,
+                                log_event.body->via.map.ptr[i].val);
+        }
+
+        /* Concatenate by using break lines */
+        out_js = flb_msgpack_raw_to_json_sds(tmp_sbuf.data, tmp_sbuf.size);
+        if (!out_js) {
+            flb_sds_destroy(out_buf);
+            msgpack_sbuffer_destroy(&tmp_sbuf);
+            flb_log_event_decoder_destroy(&log_decoder);
+            return NULL;
+        }
+
+        /*
+         * One map record has been converted, now append it to the
+         * outgoing out_buf sds variable.
+         */
+        flb_sds_cat_safe(&out_buf, out_js, flb_sds_len(out_js));
+        flb_sds_cat_safe(&out_buf, "\n", 1);
+
+        flb_sds_destroy(out_js);
+        msgpack_sbuffer_clear(&tmp_sbuf);
+    }
+
+    /* Release the unpacker */
+    flb_log_event_decoder_destroy(&log_decoder);
+
+    msgpack_sbuffer_destroy(&tmp_sbuf);
+
+    return out_buf;
+}
+
+static int logs_event_chunk_append(struct vivo_exporter *ctx,
+                                  struct flb_event_chunk *event_chunk)
+{
+    size_t len;
+    flb_sds_t json;
+    struct vivo_stream_entry *entry;
+
+
+    json = format_logs(event_chunk);
+    if (!json) {
+        flb_plg_error(ctx->ins, "cannot convert logs chunk to JSON");
+        return -1;
+    }
+
+    /* append content to the stream */
+    len = flb_sds_len(json);
+    entry = vivo_stream_append(ctx->stream_logs, json, len);
+
+    flb_sds_destroy(json);
+
+    if (!entry) {
+        flb_plg_error(ctx->ins, "cannot append JSON log to stream");
+        return -1;
+    }
+
+    return 0;
+}
+
+static int metrics_traces_event_chunk_append(struct vivo_exporter *ctx,
+                                             struct vivo_stream *vs,
+                                             struct flb_event_chunk *event_chunk)
+{
+    size_t len;
+    flb_sds_t json;
+    struct vivo_stream_entry *entry;
+
+    /* Convert msgpack to readable JSON format */
+    json = flb_msgpack_raw_to_json_sds(event_chunk->data, event_chunk->size);
+    if (!json) {
+        flb_plg_error(ctx->ins, "cannot convert metrics chunk to JSON");
+        return -1;
+    }
+
+    flb_sds_cat_safe(&json, "\n", 1);
+
+    /* append content to the stream */
+    len = flb_sds_len(json);
+    entry = vivo_stream_append(vs, json, len);
+
+    flb_sds_destroy(json);
+
+    if (!entry) {
+        flb_plg_error(ctx->ins, "cannot append JSON log to stream");
+        return -1;
+    }
+
+    return 0;
+}
+
+static int cb_vivo_init(struct flb_output_instance *ins,
+                        struct flb_config *config,
+                        void *data)
+{
+    int ret;
+    struct vivo_exporter *ctx;
+
+    flb_output_net_default("0.0.0.0", 2025 , ins);
+
+    ctx = flb_calloc(1, sizeof(struct vivo_exporter));
+    if (!ctx) {
+        flb_errno();
+        return -1;
+    }
+    ctx->ins = ins;
+
+    ret = flb_output_config_map_set(ins, (void *) ctx);
+    if (ret == -1) {
+        flb_free(ctx);
+        return -1;
+    }
+
+    flb_output_set_context(ins, ctx);
+
+    /* Load config map */
+    ret = flb_output_config_map_set(ins, (void *) ctx);
+    if (ret == -1) {
+        return -1;
+    }
+
+    /* Create Streams */
+    ctx->stream_logs = vivo_stream_create(ctx);
+    if (!ctx->stream_logs) {
+        return -1;
+    }
+
+    ctx->stream_metrics = vivo_stream_create(ctx);
+    if (!ctx->stream_metrics) {
+        return -1;
+    }
+
+    ctx->stream_traces = vivo_stream_create(ctx);
+    if (!ctx->stream_traces) {
+        return -1;
+    }
+
+    /* HTTP Server context */
+    ctx->http = vivo_http_server_create(ctx,
+                                        ins->host.name, ins->host.port, config);
+    if (!ctx->http) {
+        flb_plg_error(ctx->ins, "could not initialize HTTP server, aborting");
+        return -1;
+    }
+
+    /* Start HTTP Server */
+    ret = vivo_http_server_start(ctx->http);
+    if (ret == -1) {
+        return -1;
+    }
+
+    flb_plg_info(ctx->ins, "listening iface=%s tcp_port=%d",
+                 ins->host.name, ins->host.port);
+
+    return 0;
+}
+
+static void cb_vivo_flush(struct flb_event_chunk *event_chunk,
+                          struct flb_output_flush *out_flush,
+                          struct flb_input_instance *ins, void *out_context,
+                          struct flb_config *config)
+{
+    int ret = -1;
+    struct vivo_exporter *ctx = out_context;
+
+#ifdef FLB_HAVE_METRICS
+    if (event_chunk->type == FLB_EVENT_TYPE_METRICS) {
+        ret = metrics_traces_event_chunk_append(ctx, ctx->stream_metrics, event_chunk);
+    }
+#endif
+    if (event_chunk->type == FLB_EVENT_TYPE_LOGS) {
+        ret = logs_event_chunk_append(ctx, event_chunk);
+    }
+    else if (event_chunk->type == FLB_EVENT_TYPE_TRACES) {
+        ret = metrics_traces_event_chunk_append(ctx, ctx->stream_traces, event_chunk);
+    }
+
+    if (ret == 0) {
+        FLB_OUTPUT_RETURN(FLB_OK);
+    }
+
+    FLB_OUTPUT_RETURN(FLB_ERROR);
+}
+
+static int cb_vivo_exit(void *data, struct flb_config *config)
+{
+    struct vivo_exporter *ctx = data;
+
+    if (!ctx) {
+        return 0;
+    }
+
+    if (ctx->http) {
+        vivo_http_server_stop(ctx->http);
+        vivo_http_server_destroy(ctx->http);
+    }
+
+    vivo_stream_destroy(ctx->stream_logs);
+    vivo_stream_destroy(ctx->stream_metrics);
+    vivo_stream_destroy(ctx->stream_traces);
+
+    flb_free(ctx);
+
+    return 0;
+}
+
+/* Configuration properties map */
+static struct flb_config_map config_map[] = {
+    {
+     FLB_CONFIG_MAP_BOOL, "empty_stream_on_read", "off",
+     0, FLB_TRUE, offsetof(struct vivo_exporter, empty_stream_on_read),
+     "If enabled, when an HTTP client consumes the data from a stream, the queue "
+     "content will be removed"
+    },
+
+    {
+     FLB_CONFIG_MAP_SIZE, "stream_queue_size", "20M",
+     0, FLB_TRUE, offsetof(struct vivo_exporter, stream_queue_size),
+     "Specify the maximum queue size per stream. Each specific stream for logs, metrics "
+     "and traces can hold up to 'stream_queue_size' bytes."
+    },
+
+    {
+     FLB_CONFIG_MAP_STR, "http_cors_allow_origin", NULL,
+     0, FLB_TRUE, offsetof(struct vivo_exporter, http_cors_allow_origin),
+     "Specify the value for the HTTP Access-Control-Allow-Origin header (CORS)"
+    },
+
+    /* EOF */
+    {0}
+};
+
+/* Plugin reference */
+struct flb_output_plugin out_vivo_exporter_plugin = {
+    .name        = "vivo_exporter",
+    .description = "Vivo Exporter",
+    .cb_init     = cb_vivo_init,
+    .cb_flush    = cb_vivo_flush,
+    .cb_exit     = cb_vivo_exit,
+    .flags       = FLB_OUTPUT_NET,
+    .event_type  = FLB_OUTPUT_LOGS | FLB_OUTPUT_METRICS | FLB_OUTPUT_TRACES,
+    .config_map  = config_map,
+    .workers     = 1,
+};
diff --git a/fluent-bit/plugins/out_vivo_exporter/vivo.h b/fluent-bit/plugins/out_vivo_exporter/vivo.h
new file mode 100644
index 000000000..943c40364
--- /dev/null
+++ b/fluent-bit/plugins/out_vivo_exporter/vivo.h
@@ -0,0 +1,45 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  Fluent Bit
+ *  ==========
+ *  Copyright (C) 2015-2023 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.
+ */
+
+#ifndef FLB_VIVO_EXPORTER_H
+#define FLB_VIVO_EXPORTER_H
+
+#include <fluent-bit/flb_output_plugin.h>
+#include <fluent-bit/flb_ring_buffer.h>
+
+#define VIVO_RING_BUFFER_SIZE 10
+
+/* Plugin context */
+struct vivo_exporter {
+    void *http;
+
+    void *stream_logs;
+    void *stream_metrics;
+    void *stream_traces;
+
+    /* options */
+    int empty_stream_on_read;
+    size_t stream_queue_size;
+    flb_sds_t http_cors_allow_origin;
+
+    /* instance context */
+    struct flb_output_instance *ins;
+};
+
+#endif
diff --git a/fluent-bit/plugins/out_vivo_exporter/vivo_http.c b/fluent-bit/plugins/out_vivo_exporter/vivo_http.c
new file mode 100644
index 000000000..efd39dcc8
--- /dev/null
+++ b/fluent-bit/plugins/out_vivo_exporter/vivo_http.c
@@ -0,0 +1,266 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  Fluent Bit
+ *  ==========
+ *  Copyright (C) 2015-2023 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_output_plugin.h>
+#include <fluent-bit/flb_http_server.h>
+
+#include "vivo.h"
+#include "vivo_http.h"
+#include "vivo_stream.h"
+
+#define VIVO_CONTENT_TYPE       "Content-Type"
+#define VIVO_CONTENT_TYPE_JSON  "application/json"
+#define VIVO_STREAM_START_ID    "Vivo-Stream-Start-ID"
+#define VIVO_STREAM_END_ID      "Vivo-Stream-End-ID"
+
+static int stream_get_uri_properties(mk_request_t *request,
+                                     int64_t *from, int64_t *to, int64_t *limit)
+{
+    char *ptr;
+    flb_sds_t buf;
+
+    *from = -1;
+    *to = -1;
+    *limit = -1;
+
+    buf = flb_sds_create_len(request->query_string.data, request->query_string.len);
+    if (!buf) {
+        return -1;
+    }
+
+    ptr = strstr(buf, "from=");
+    if (ptr) {
+        *from = atol(ptr + 5);
+    }
+
+    ptr = strstr(buf, "to=");
+    if (ptr) {
+        *to = atol(ptr + 3);
+    }
+
+    ptr = strstr(buf, "limit=");
+    if (ptr) {
+        *limit = atol(ptr + 6);
+    }
+
+    flb_sds_destroy(buf);
+
+    return 0;
+}
+
+static void headers_set(mk_request_t *request, struct vivo_stream *vs)
+{
+    struct vivo_exporter *ctx;
+
+
+    /* parent context */
+    ctx = vs->parent;
+
+    /* content type */
+    mk_http_header(request,
+                   VIVO_CONTENT_TYPE, sizeof(VIVO_CONTENT_TYPE) - 1,
+                   VIVO_CONTENT_TYPE_JSON, sizeof(VIVO_CONTENT_TYPE_JSON) - 1);
+
+    /* CORS */
+    if (ctx->http_cors_allow_origin) {
+        mk_http_header(request,
+                       "Access-Control-Allow-Origin",
+                       sizeof("Access-Control-Allow-Origin") - 1,
+                       ctx->http_cors_allow_origin,
+                       flb_sds_len(ctx->http_cors_allow_origin));
+
+        mk_http_header(request,
+                       "Access-Control-Allow-Headers",
+                       sizeof("Access-Control-Allow-Headers") - 1,
+                       "Origin, X-Requested-With, Content-Type, Accept",
+                       sizeof("Origin, X-Requested-With, Content-Type, Accept") - 1);
+
+        mk_http_header(request,
+                       "Access-Control-Expose-Headers",
+                       sizeof("Access-Control-Expose-Headers") - 1,
+                       "vivo-stream-start-id, vivo-stream-end-id",
+                       sizeof("vivo-stream-start-id, vivo-stream-end-id") - 1);
+
+    }
+}
+
+static void serve_content(mk_request_t *request, struct vivo_stream *vs)
+{
+    int64_t from = -1;
+    int64_t to = -1;
+    int64_t limit = -1;
+    int64_t stream_start_id = -1;
+    int64_t stream_end_id = -1;
+    flb_sds_t payload;
+    flb_sds_t str_start;
+    flb_sds_t str_end;
+
+
+    if (request->query_string.len > 0) {
+        stream_get_uri_properties(request, &from, &to, &limit);
+    }
+
+    payload = vivo_stream_get_content(vs, from, to, limit,
+                                      &stream_start_id, &stream_end_id);
+    if (!payload) {
+        mk_http_status(request, 500);
+        return;
+    }
+
+    if (flb_sds_len(payload) == 0) {
+        mk_http_status(request, 200);
+        headers_set(request, vs);
+        flb_sds_destroy(payload);
+        return;
+    }
+
+    mk_http_status(request, 200);
+
+    /* set response headers */
+    headers_set(request, vs);
+
+    /* stream ids served: compose buffer and set headers */
+    str_start = flb_sds_create_size(32);
+    flb_sds_printf(&str_start, "%" PRId64, stream_start_id);
+
+    str_end = flb_sds_create_size(32);
+    flb_sds_printf(&str_end, "%" PRId64, stream_end_id);
+
+    mk_http_header(request,
+                   VIVO_STREAM_START_ID, sizeof(VIVO_STREAM_START_ID) - 1,
+                   str_start, flb_sds_len(str_start));
+
+    mk_http_header(request,
+                   VIVO_STREAM_END_ID, sizeof(VIVO_STREAM_END_ID) - 1,
+                   str_end, flb_sds_len(str_end));
+
+    /* send payload */
+    mk_http_send(request, payload, flb_sds_len(payload), NULL);
+
+    /* release */
+    flb_sds_destroy(payload);
+    flb_sds_destroy(str_start);
+    flb_sds_destroy(str_end);
+}
+
+/* HTTP endpoint: /logs */
+static void cb_logs(mk_request_t *request, void *data)
+{
+    struct vivo_exporter *ctx;
+
+    ctx = (struct vivo_exporter *) data;
+
+    serve_content(request, ctx->stream_logs);
+    mk_http_done(request);
+}
+
+/* HTTP endpoint: /metrics */
+static void cb_metrics(mk_request_t *request, void *data)
+{
+    struct vivo_exporter *ctx;
+
+    ctx = (struct vivo_exporter *) data;
+
+    serve_content(request, ctx->stream_metrics);
+    mk_http_done(request);
+}
+
+static void cb_traces(mk_request_t *request, void *data)
+{
+    struct vivo_exporter *ctx;
+
+    ctx = (struct vivo_exporter *) data;
+
+    serve_content(request, ctx->stream_traces);
+    mk_http_done(request);
+}
+
+/* HTTP endpoint: / (root) */
+static void cb_root(mk_request_t *request, void *data)
+{
+    (void) data;
+
+    mk_http_status(request, 200);
+    mk_http_send(request, "Fluent Bit Vivo Exporter\n", 24, NULL);
+    mk_http_done(request);
+}
+
+struct vivo_http *vivo_http_server_create(struct vivo_exporter *ctx,
+                                          const char *listen,
+                                          int tcp_port,
+                                          struct flb_config *config)
+{
+    int vid;
+    char tmp[32];
+    struct vivo_http *ph;
+
+    ph = flb_malloc(sizeof(struct vivo_http));
+    if (!ph) {
+        flb_errno();
+        return NULL;
+    }
+    ph->config = config;
+
+    /* HTTP Server context */
+    ph->ctx = mk_create();
+    if (!ph->ctx) {
+        flb_free(ph);
+        return NULL;
+    }
+
+    /* Compose listen address */
+    snprintf(tmp, sizeof(tmp) -1, "%s:%d", listen, tcp_port);
+    mk_config_set(ph->ctx,
+                  "Listen", tmp,
+                  "Workers", "1",
+                  NULL);
+
+    /* Virtual host */
+    vid = mk_vhost_create(ph->ctx, NULL);
+    ph->vid = vid;
+
+    /* Set HTTP URI callbacks */
+    mk_vhost_handler(ph->ctx, vid, "/logs", cb_logs, ctx);
+    mk_vhost_handler(ph->ctx, vid, "/metrics", cb_metrics, ctx);
+    mk_vhost_handler(ph->ctx, vid, "/traces", cb_traces, ctx);
+    mk_vhost_handler(ph->ctx, vid, "/", cb_root, NULL);
+
+    return ph;
+}
+
+void vivo_http_server_destroy(struct vivo_http *ph)
+{
+    if (ph) {
+        /* TODO: release mk_vhost */
+        if (ph->ctx) {
+            mk_destroy(ph->ctx);
+        }
+        flb_free(ph);
+    }
+}
+
+int vivo_http_server_start(struct vivo_http *ph)
+{
+    return mk_start(ph->ctx);
+}
+
+int vivo_http_server_stop(struct vivo_http *ph)
+{
+    return mk_stop(ph->ctx);
+}
diff --git a/fluent-bit/plugins/out_vivo_exporter/vivo_http.h b/fluent-bit/plugins/out_vivo_exporter/vivo_http.h
new file mode 100644
index 000000000..77453d289
--- /dev/null
+++ b/fluent-bit/plugins/out_vivo_exporter/vivo_http.h
@@ -0,0 +1,56 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  Fluent Bit
+ *  ==========
+ *  Copyright (C) 2015-2023 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.
+ */
+
+#ifndef FLB_VIVO_EXPORTER_HTTP_H
+#define FLB_VIVO_EXPORTER_HTTP_H
+
+#include <fluent-bit/flb_output_plugin.h>
+#include <monkey/mk_lib.h>
+
+#include "vivo.h"
+
+/* HTTP response payload received through a Message Queue */
+struct vivo_http_buf {
+    int users;
+    char *buf_data;
+    size_t buf_size;
+    struct mk_list _head;
+};
+
+/* Vivo HTTP Server context */
+struct vivo_http {
+    mk_ctx_t *ctx;                /* Monkey HTTP Context */
+    int vid;                      /* Virtual host ID */
+    int qid_metrics;              /* Queue ID for Metrics buffer */
+    struct flb_config *config;    /* Fluent Bit context */
+};
+
+struct vivo_http *vivo_http_server_create(struct vivo_exporter *ctx,
+                                          const char *listen,
+                                          int tcp_port,
+                                          struct flb_config *config);
+void vivo_http_server_destroy(struct vivo_http *ph);
+
+int vivo_http_server_start(struct vivo_http *ph);
+int vivo_http_server_stop(struct vivo_http *ph);
+
+int vivo_http_server_mq_push_metrics(struct vivo_http *ph,
+                                     void *data, size_t size);
+
+#endif
diff --git a/fluent-bit/plugins/out_vivo_exporter/vivo_stream.c b/fluent-bit/plugins/out_vivo_exporter/vivo_stream.c
new file mode 100644
index 000000000..9c8edb9ea
--- /dev/null
+++ b/fluent-bit/plugins/out_vivo_exporter/vivo_stream.c
@@ -0,0 +1,239 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  Fluent Bit
+ *  ==========
+ *  Copyright (C) 2015-2023 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_mem.h>
+#include <fluent-bit/flb_log.h>
+#include <fluent-bit/flb_sds.h>
+
+#include "vivo.h"
+#include "vivo_stream.h"
+
+static inline void stream_lock(struct vivo_stream *vs)
+{
+    pthread_mutex_lock(&vs->stream_mutex);
+}
+
+static inline void stream_unlock(struct vivo_stream *vs)
+{
+    pthread_mutex_unlock(&vs->stream_mutex);
+}
+
+struct vivo_stream *vivo_stream_create(struct vivo_exporter *ctx)
+{
+    struct vivo_stream *vs;
+
+    vs = flb_calloc(1, sizeof(struct vivo_stream));
+    if (!vs) {
+        flb_errno();
+        return NULL;
+    }
+    vs->parent = ctx;
+    vs->entries_added = 0;
+    pthread_mutex_init(&vs->stream_mutex, NULL);
+    mk_list_init(&vs->entries);
+    mk_list_init(&vs->purge);
+
+    return vs;
+}
+
+static uint64_t vivo_stream_get_new_id(struct vivo_stream *vs)
+{
+    uint64_t id = 0;
+
+    stream_lock(vs);
+
+    /* to get the next id, we simply use the value of the counter 'entries' added */
+    id = vs->entries_added;
+
+    stream_unlock(vs);
+
+    return id;
+}
+
+
+struct vivo_stream_entry *vivo_stream_entry_create(struct vivo_stream *vs,
+                                                   void *data, size_t size)
+{
+    struct vivo_stream_entry *e;
+
+    if (size == 0) {
+        return NULL;
+    }
+
+    e = flb_calloc(1, sizeof(struct vivo_stream_entry));
+    if (!e) {
+        flb_errno();
+        return NULL;
+    }
+    e->id = vivo_stream_get_new_id(vs);
+
+    e->data = flb_sds_create_len(data, size);
+    if (!e->data) {
+        flb_free(e);
+        return NULL;
+    }
+
+    return e;
+}
+
+/*
+ * NOTE: this function must always invoked under the stream_mutex in a locked state, we don't do the lock
+ * inside the function since the caller might be itering the parent list
+ */
+static void vivo_stream_entry_destroy(struct vivo_stream *vs, struct vivo_stream_entry *e)
+{
+    mk_list_del(&e->_head);
+    vs->current_bytes_size -= flb_sds_len(e->data);
+    flb_sds_destroy(e->data);
+    flb_free(e);
+}
+
+/* NOTE: this function must run inside a stream_lock()/stream_unlock() protection */
+static void vivo_stream_cleanup(struct vivo_stream *vs)
+{
+    struct mk_list *tmp;
+    struct mk_list *head;
+    struct vivo_stream_entry *e;
+
+    mk_list_foreach_safe(head, tmp, &vs->entries) {
+        e = mk_list_entry(head, struct vivo_stream_entry, _head);
+        vivo_stream_entry_destroy(vs, e);
+    }
+}
+
+void vivo_stream_destroy(struct vivo_stream *vs)
+{
+    struct mk_list *tmp;
+    struct mk_list *head;
+    struct vivo_stream_entry *e;
+
+    stream_lock(vs);
+    mk_list_foreach_safe(head, tmp, &vs->entries) {
+        e = mk_list_entry(head, struct vivo_stream_entry, _head);
+        vivo_stream_entry_destroy(vs, e);
+    }
+    stream_unlock(vs);
+
+    flb_free(vs);
+}
+
+flb_sds_t vivo_stream_get_content(struct vivo_stream *vs, int64_t from, int64_t to,
+                                  int64_t limit,
+                                  int64_t *stream_start_id, int64_t *stream_end_id)
+{
+    int64_t count = 0;
+    flb_sds_t buf;
+    struct mk_list *head;
+    struct vivo_stream_entry *e;
+    struct vivo_exporter *ctx = vs->parent;
+
+    buf = flb_sds_create_size(vs->current_bytes_size);
+    if (!buf) {
+        return NULL;
+    }
+
+    stream_lock(vs);
+
+    mk_list_foreach(head, &vs->entries) {
+        e = mk_list_entry(head, struct vivo_stream_entry, _head);
+
+        if (e->id < from && from != -1) {
+            continue;
+        }
+
+        if (e->id > to && to != -1 && to != 0) {
+            break;
+        }
+
+        if (count == 0) {
+            *stream_start_id = e->id;
+        }
+
+        flb_sds_cat_safe(&buf, e->data, flb_sds_len(e->data));
+
+        *stream_end_id = e->id;
+        count++;
+
+        if (limit > 0 && count >= limit) {
+            break;
+        }
+    }
+
+    if (ctx->empty_stream_on_read) {
+        vivo_stream_cleanup(vs);
+    }
+
+    stream_unlock(vs);
+
+    return buf;
+}
+
+/* Remove entries from the stream until cleanup 'size' bytes. This function is inside a stream_lock()/stream_unlock() */
+static void vivo_stream_make_room(struct vivo_stream *vs, size_t size)
+{
+    size_t deleted = 0;
+    struct mk_list *tmp;
+    struct mk_list *head;
+    struct vivo_stream_entry *e;
+
+    mk_list_foreach_safe(head, tmp, &vs->entries) {
+        e = mk_list_entry(head, struct vivo_stream_entry, _head);
+        deleted += flb_sds_len(e->data);
+        vivo_stream_entry_destroy(vs, e);
+        if (deleted >= size) {
+            break;
+        }
+    }
+}
+
+struct vivo_stream_entry *vivo_stream_append(struct vivo_stream *vs, void *data, size_t size)
+{
+    struct vivo_stream_entry *e;
+    struct vivo_exporter *ctx = vs->parent;
+
+    e = vivo_stream_entry_create(vs, data, size);
+    if (!e) {
+        return NULL;
+    }
+
+    stream_lock(vs);
+
+    /* check queue space */
+    if (vs->current_bytes_size + size > ctx->stream_queue_size) {
+        /* free up some space */
+        if (mk_list_size(&vs->entries) == 0) {
+            /* do nothing, the user size setup is smaller that the incoming size, let it pass */
+        }
+        else {
+            /* release at least 'size' bytes */
+            vivo_stream_make_room(vs, size);
+        }
+    }
+
+    /* add entry to the end of the list */
+    mk_list_add(&e->_head, &vs->entries);
+
+    vs->entries_added++;
+    vs->current_bytes_size += size;
+
+    stream_unlock(vs);
+
+    return e;
+}
diff --git a/fluent-bit/plugins/out_vivo_exporter/vivo_stream.h b/fluent-bit/plugins/out_vivo_exporter/vivo_stream.h
new file mode 100644
index 000000000..fb0ca6053
--- /dev/null
+++ b/fluent-bit/plugins/out_vivo_exporter/vivo_stream.h
@@ -0,0 +1,59 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  Fluent Bit
+ *  ==========
+ *  Copyright (C) 2015-2023 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.
+ */
+
+#ifndef FLB_VIVO_STREAM_H
+#define FLB_VIVO_STREAM_H
+
+#include <fluent-bit/flb_info.h>
+
+#include "vivo.h"
+
+struct vivo_stream_entry {
+    int64_t id;
+    flb_sds_t data;
+    struct mk_list _head;
+};
+
+struct vivo_stream {
+    size_t entries_added;
+
+    size_t current_bytes_size;
+
+    struct mk_list entries;
+    struct mk_list purge;
+
+    /* mutex to protect the context */
+    pthread_mutex_t stream_mutex;
+
+    /* back reference to struct vivo_exporter context */
+    void *parent;
+};
+
+
+struct vivo_stream *vivo_stream_create(struct vivo_exporter *ctx);
+void vivo_stream_destroy(struct vivo_stream *vs);
+struct vivo_stream_entry *vivo_stream_entry_create(struct vivo_stream *vs,
+                                                   void *data, size_t size);
+struct vivo_stream_entry *vivo_stream_append(struct vivo_stream *vs, void *data,
+                                             size_t size);
+flb_sds_t vivo_stream_get_content(struct vivo_stream *vs, int64_t from, int64_t to,
+                                  int64_t limit,
+                                  int64_t *stream_start_id, int64_t *stream_end_id);
+
+#endif