Merging upstream version 1.44.3.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 351 insertions, 0 deletions

diff --git a/fluent-bit/plugins/out_kafka_rest/kafka.c b/fluent-bit/plugins/out_kafka_rest/kafka.c
new file mode 100644
index 000000000..f3b6153a6
--- /dev/null
+++ b/fluent-bit/plugins/out_kafka_rest/kafka.c
@@ -0,0 +1,351 @@
+/* -*- 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_output_plugin.h>
+#include <fluent-bit/flb_utils.h>
+#include <fluent-bit/flb_time.h>
+#include <fluent-bit/flb_pack.h>
+#include <fluent-bit/flb_sds.h>
+#include <fluent-bit/flb_http_client.h>
+#include <fluent-bit/flb_config_map.h>
+#include <fluent-bit/flb_log_event_decoder.h>
+#include <msgpack.h>
+
+#include "kafka.h"
+#include "kafka_conf.h"
+
+static struct flb_config_map config_map[] = {
+    {
+     FLB_CONFIG_MAP_STR, "message_key", NULL,
+     0, FLB_TRUE, offsetof(struct flb_kafka_rest, message_key),
+     "Specify a message key. "
+    },
+
+    {
+     FLB_CONFIG_MAP_STR, "time_key", NULL,
+     0, FLB_TRUE, offsetof(struct flb_kafka_rest, time_key),
+     "Specify the name of the field that holds the record timestamp. "
+    },
+
+    {
+     FLB_CONFIG_MAP_STR, "topic", "fluent-bit",
+     0, FLB_TRUE, offsetof(struct flb_kafka_rest, topic),
+     "Specify the kafka topic. "
+    },
+
+    {
+     FLB_CONFIG_MAP_STR, "url_path", NULL,
+     0, FLB_TRUE, offsetof(struct flb_kafka_rest, url_path),
+     "Specify an optional HTTP URL path for the target web server, e.g: /something"
+    },
+
+    {
+     FLB_CONFIG_MAP_DOUBLE, "partition", "-1",
+     0, FLB_TRUE, offsetof(struct flb_kafka_rest, partition),
+     "Specify kafka partition number. "
+    },
+
+    {
+     FLB_CONFIG_MAP_STR, "time_key_format", FLB_KAFKA_TIME_KEYF,
+     0, FLB_TRUE, offsetof(struct flb_kafka_rest, time_key_format),
+     "Specify the format of the timestamp. "
+    },
+
+    {
+     FLB_CONFIG_MAP_BOOL, "include_tag_key", "false",
+     0, FLB_TRUE, offsetof(struct flb_kafka_rest, include_tag_key),
+     "Specify whether to append tag name to final record. "
+    },
+
+    {
+     FLB_CONFIG_MAP_STR, "tag_key", "_flb-key",
+     0, FLB_TRUE, offsetof(struct flb_kafka_rest, tag_key),
+     "Specify the key name of the record if include_tag_key is enabled. "
+    },
+    {
+     FLB_CONFIG_MAP_BOOL, "avro_http_header", "false",
+     0, FLB_TRUE, offsetof(struct flb_kafka_rest, avro_http_header),
+     "Specify if the format has avro header in http request"
+    },
+
+    /* EOF */
+    {0}
+};
+/*
+ * Convert the internal Fluent Bit data representation to the required
+ * one by Kafka REST Proxy.
+ */
+static flb_sds_t kafka_rest_format(const void *data, size_t bytes,
+                                   const char *tag, int tag_len,
+                                   size_t *out_size,
+                                   struct flb_kafka_rest *ctx)
+{
+    int i;
+    int len;
+    int arr_size = 0;
+    int map_size;
+    size_t s;
+    flb_sds_t out_buf;
+    char time_formatted[256];
+    msgpack_object map;
+    msgpack_object key;
+    msgpack_object val;
+    struct tm tm;
+    msgpack_sbuffer mp_sbuf;
+    msgpack_packer mp_pck;
+    struct flb_log_event_decoder log_decoder;
+    struct flb_log_event log_event;
+    int ret;
+
+    ret = flb_log_event_decoder_init(&log_decoder, (char *) data, bytes);
+
+    if (ret != FLB_EVENT_DECODER_SUCCESS) {
+        flb_plg_error(ctx->ins,
+                      "Log event decoder initialization error : %d", ret);
+
+        return NULL;
+    }
+
+    /* Init temporary buffers */
+    msgpack_sbuffer_init(&mp_sbuf);
+    msgpack_packer_init(&mp_pck, &mp_sbuf, msgpack_sbuffer_write);
+
+    /* Count number of entries */
+    arr_size = flb_mp_count(data, bytes);
+
+    /* Root map */
+    msgpack_pack_map(&mp_pck, 1);
+    msgpack_pack_str(&mp_pck, 7);
+    msgpack_pack_str_body(&mp_pck, "records", 7);
+
+    msgpack_pack_array(&mp_pck, arr_size);
+
+    /* Iterate and compose array content */
+    while ((ret = flb_log_event_decoder_next(
+                    &log_decoder,
+                    &log_event)) == FLB_EVENT_DECODER_SUCCESS) {
+        map = *log_event.body;
+        map_size = 1;
+
+        if (ctx->partition >= 0) {
+            map_size++;
+        }
+
+        if (ctx->message_key != NULL) {
+            map_size++;
+        }
+
+        msgpack_pack_map(&mp_pck, map_size);
+        if (ctx->partition >= 0) {
+            msgpack_pack_str(&mp_pck, 9);
+            msgpack_pack_str_body(&mp_pck, "partition", 9);
+            msgpack_pack_int64(&mp_pck, ctx->partition);
+        }
+
+
+        if (ctx->message_key != NULL) {
+            msgpack_pack_str(&mp_pck, 3);
+            msgpack_pack_str_body(&mp_pck, "key", 3);
+            msgpack_pack_str(&mp_pck, ctx->message_key_len);
+            msgpack_pack_str_body(&mp_pck, ctx->message_key, ctx->message_key_len);
+        }
+
+        /* Value Map Size */
+        map_size = map.via.map.size;
+        map_size++;
+        if (ctx->include_tag_key == FLB_TRUE) {
+            map_size++;
+        }
+
+        msgpack_pack_str(&mp_pck, 5);
+        msgpack_pack_str_body(&mp_pck, "value", 5);
+
+        msgpack_pack_map(&mp_pck, map_size);
+
+        /* Time key and time formatted */
+        msgpack_pack_str(&mp_pck, ctx->time_key_len);
+        msgpack_pack_str_body(&mp_pck, ctx->time_key, ctx->time_key_len);
+
+        /* Format the time */
+        gmtime_r(&log_event.timestamp.tm.tv_sec, &tm);
+        s = strftime(time_formatted, sizeof(time_formatted) - 1,
+                     ctx->time_key_format, &tm);
+        len = snprintf(time_formatted + s, sizeof(time_formatted) - 1 - s,
+                       ".%09" PRIu64 "Z", (uint64_t) log_event.timestamp.tm.tv_nsec);
+        s += len;
+        msgpack_pack_str(&mp_pck, s);
+        msgpack_pack_str_body(&mp_pck, time_formatted, s);
+
+        /* Tag Key */
+        if (ctx->include_tag_key == FLB_TRUE) {
+            msgpack_pack_str(&mp_pck, ctx->tag_key_len);
+            msgpack_pack_str_body(&mp_pck, ctx->tag_key, ctx->tag_key_len);
+            msgpack_pack_str(&mp_pck, tag_len);
+            msgpack_pack_str_body(&mp_pck, tag, tag_len);
+        }
+
+        for (i = 0; i < map.via.map.size; i++) {
+            key = map.via.map.ptr[i].key;
+            val = map.via.map.ptr[i].val;
+
+            msgpack_pack_object(&mp_pck, key);
+            msgpack_pack_object(&mp_pck, val);
+        }
+    }
+    flb_log_event_decoder_destroy(&log_decoder);
+
+    /* Convert to JSON */
+    out_buf = flb_msgpack_raw_to_json_sds(mp_sbuf.data, mp_sbuf.size);
+    msgpack_sbuffer_destroy(&mp_sbuf);
+    if (!out_buf) {
+        return NULL;
+    }
+
+    *out_size = flb_sds_len(out_buf);
+
+    return out_buf;
+}
+
+static int cb_kafka_init(struct flb_output_instance *ins,
+                         struct flb_config *config,
+                         void *data)
+{
+    (void) ins;
+    (void) config;
+    (void) data;
+    struct flb_kafka_rest *ctx;
+
+    ctx = flb_kr_conf_create(ins, config);
+    if (!ctx) {
+        flb_plg_error(ins, "cannot initialize plugin");
+        return -1;
+    }
+
+    flb_plg_debug(ctx->ins, "host=%s port=%i",
+                  ins->host.name, ins->host.port);
+    flb_output_set_context(ins, ctx);
+
+    return 0;
+}
+
+static void cb_kafka_flush(struct flb_event_chunk *event_chunk,
+                           struct flb_output_flush *out_flush,
+                           struct flb_input_instance *i_ins,
+                           void *out_context,
+                           struct flb_config *config)
+{
+    int ret;
+    flb_sds_t js;
+    size_t js_size;
+    size_t b_sent;
+    struct flb_http_client *c;
+    struct flb_connection *u_conn;
+    struct flb_kafka_rest *ctx = out_context;
+    (void) i_ins;
+
+    /* Get upstream connection */
+    u_conn = flb_upstream_conn_get(ctx->u);
+    if (!u_conn) {
+        FLB_OUTPUT_RETURN(FLB_RETRY);
+    }
+
+    /* Convert format */
+    js = kafka_rest_format(event_chunk->data, event_chunk->size,
+                           event_chunk->tag, flb_sds_len(event_chunk->tag),
+                           &js_size, ctx);
+    if (!js) {
+        flb_upstream_conn_release(u_conn);
+        FLB_OUTPUT_RETURN(FLB_ERROR);
+    }
+
+    /* Compose HTTP Client request */
+    c = flb_http_client(u_conn, FLB_HTTP_POST, ctx->uri,
+                        js, js_size, NULL, 0, NULL, 0);
+    flb_http_add_header(c, "User-Agent", 10, "Fluent-Bit", 10);
+    if (ctx->avro_http_header == FLB_TRUE) {
+        flb_http_add_header(c,
+                            "Content-Type", 12,
+                            "application/vnd.kafka.avro.v2+json", 34);
+    }
+    else {
+        flb_http_add_header(c,
+                            "Content-Type", 12,
+                            "application/vnd.kafka.json.v2+json", 34);
+    }
+    
+    if (ctx->http_user && ctx->http_passwd) {
+        flb_http_basic_auth(c, ctx->http_user, ctx->http_passwd);
+    }
+
+    ret = flb_http_do(c, &b_sent);
+    if (ret != 0) {
+        flb_plg_warn(ctx->ins, "http_do=%i", ret);
+        goto retry;
+    }
+    else {
+        /* The request was issued successfully, validate the 'error' field */
+        flb_plg_debug(ctx->ins, "HTTP Status=%i", c->resp.status);
+        if (c->resp.status != 200) {
+            if (c->resp.payload_size > 0) {
+                flb_plg_debug(ctx->ins, "Kafka REST response\n%s",
+                              c->resp.payload);
+            }
+            goto retry;
+        }
+
+        if (c->resp.payload_size > 0) {
+            flb_plg_debug(ctx->ins, "Kafka REST response\n%s",
+                          c->resp.payload);
+        }
+        else {
+            goto retry;
+        }
+    }
+
+    /* Cleanup */
+    flb_http_client_destroy(c);
+    flb_sds_destroy(js);
+    flb_upstream_conn_release(u_conn);
+    FLB_OUTPUT_RETURN(FLB_OK);
+
+    /* Issue a retry */
+ retry:
+    flb_http_client_destroy(c);
+    flb_sds_destroy(js);
+    flb_upstream_conn_release(u_conn);
+    FLB_OUTPUT_RETURN(FLB_RETRY);
+}
+
+static int cb_kafka_exit(void *data, struct flb_config *config)
+{
+    struct flb_kafka_rest *ctx = data;
+
+    flb_kr_conf_destroy(ctx);
+    return 0;
+}
+
+struct flb_output_plugin out_kafka_rest_plugin = {
+    .name         = "kafka-rest",
+    .description  = "Kafka REST Proxy",
+    .cb_init      = cb_kafka_init,
+    .cb_flush     = cb_kafka_flush,
+    .cb_exit      = cb_kafka_exit,
+    .config_map   = config_map,
+    .flags        = FLB_OUTPUT_NET | FLB_IO_OPT_TLS,
+};