1 files changed, 266 insertions, 0 deletions
diff --git a/src/fluent-bit/plugins/out_vivo_exporter/vivo_http.c b/src/fluent-bit/plugins/out_vivo_exporter/vivo_http.c
new file mode 100644
index 000000000..efd39dcc8
--- /dev/null
+++ b/src/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);
+}