out_vivo_exporter: WIP #11040
out_vivo_exporter: WIP #11040
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Signed-off-by: Eduardo Silva <[email protected]>
Signed-off-by: Eduardo Silva <[email protected]>
WalkthroughThe VIVO exporter plugin undergoes significant refactoring: log formatting now receives input instance context for plugin name resolution and implements OTLP/non-OTLP branch handling with group metadata tracking; HTTP endpoints migrate to versioned Changes
Sequence DiagramsequenceDiagram
participant Client
participant HTTP as HTTP Handler
participant Logs as Log Formatter
participant Stream as Stream Manager
participant Output as Output Buffer
Client->>HTTP: Request /api/v1/logs
HTTP->>HTTP: headers_set_common()
HTTP->>Stream: vivo_stream_get_content(from, to, limit, &start_id, &end_id, &next_id)
Stream->>Stream: Initialize IDs, iterate entries
Stream-->>HTTP: Content buffer + IDs
HTTP->>Output: Set stream header: Vivo-Stream-Start-ID
HTTP->>Output: Set stream header: Vivo-Stream-End-ID
HTTP->>Output: Set stream header: Vivo-Stream-Next-ID
HTTP-->>Client: Response with stream tracking headers
rect rgb(200, 220, 240)
Note over Logs: Log Processing (New)
Client->>Logs: format_logs(src_ins, event_chunk, config)
Logs->>Logs: Extract plugin name via src_ins
Logs->>Logs: Track group metadata & detect mismatches
Logs->>Logs: Build root MsgPack map
Logs->>Logs: Branch: OTLP? Append otlp map : flb_group map
Logs-->>Output: Formatted JSON with trailing newline
end
Estimated code review effort🎯 4 (Complex) | ⏱️ ~60 minutes The changes span six files with heterogeneous modifications: intricate log formatting logic with group metadata tracking and OTLP branching in Poem
Pre-merge checks and finishing touches❌ Failed checks (1 warning, 1 inconclusive)
✅ Passed checks (1 passed)
✨ Finishing touches
🧪 Generate unit tests (beta)
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| /* Convert the complete msgpack structure to JSON */ | ||
| out_js = flb_msgpack_raw_to_json_sds(tmp_sbuf.data, tmp_sbuf.size, | ||
| config->json_escape_unicode); | ||
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| msgpack_sbuffer_destroy(&tmp_sbuf); | ||
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| return out_buf; | ||
| /* append a newline */ | ||
| flb_sds_cat_safe(&out_js, "\n", 1); | ||
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| if (!out_js) { |
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If flb_msgpack_raw_to_json_sds fails, out_js is NULL but flb_sds_cat_safe(&out_js, "\n", 1) is called before checking for the error. flb_sds_cat_safe dereferences the pointer, so this path will segfault instead of propagating a graceful error whenever the JSON conversion runs out of memory or receives invalid data. The previous implementation checked the return value before appending, so the crash is new to this change.
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| ph->vid = vid; | ||
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| /* 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, "/api/v1/logs", cb_logs, ctx); | ||
| mk_vhost_handler(ph->ctx, vid, "/api/v1/metrics", cb_metrics, ctx); | ||
| mk_vhost_handler(ph->ctx, vid, "/api/v1/traces", cb_traces, ctx); | ||
| mk_vhost_handler(ph->ctx, vid, "/api/v1/internal/metrics", cb_internal_metrics, ctx); |
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The new /api/v1/internal/metrics handler unconditionally includes and calls flb_me_get_cmetrics and cmt_encode_msgpack_create. These symbols are only available when Fluent Bit is built with FLB_METRICS enabled, but the file lacks any #ifdef FLB_HAVE_METRICS guard. Building the plugin with metrics disabled now results in an implicit‑declaration/undefined‑reference build failure. Consider compiling this handler only when FLB_HAVE_METRICS is defined or providing stubs.
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Actionable comments posted: 1
Caution
Some comments are outside the diff and can’t be posted inline due to platform limitations.
⚠️ Outside diff range comments (2)
plugins/out_vivo_exporter/vivo_stream.c (1)
71-87: Race: duplicate stream IDs under concurrencye->id is assigned in vivo_stream_entry_create() before taking stream_mutex, while vs->entries_added is incremented in vivo_stream_append() under lock. Two threads can read the same entries_added and produce duplicate IDs. Assign the ID and increment counters atomically under the lock in vivo_stream_append(), and stop setting e->id in vivo_stream_entry_create().
Apply:
@@ - e->id = vivo_stream_get_new_id(vs); @@ - /* add entry to the end of the list */ + /* assign id atomically and add entry to the end of the list */ + e->id = vs->entries_added; + vs->entries_added++; mk_list_add(&e->_head, &vs->entries); @@ - vs->entries_added++;Optionally remove now-unused vivo_stream_get_new_id() to avoid confusion.
Also applies to: 221-253
plugins/out_vivo_exporter/vivo.c (1)
362-416: Initialization error paths leak resources and config map set is duplicated
- flb_output_config_map_set() is called twice; keep one.
- On failures after allocating ctx/streams/http, resources aren’t unwound (leaks on error).
Refactor with a single config map call and structured cleanup.
@@ - 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; - } + ret = flb_output_config_map_set(ins, (void *) ctx); + if (ret == -1) { + flb_free(ctx); + return -1; + } + flb_output_set_context(ins, ctx); @@ - ctx->stream_logs = vivo_stream_create(ctx); - if (!ctx->stream_logs) { - return -1; - } + ctx->stream_logs = vivo_stream_create(ctx); + if (!ctx->stream_logs) { flb_free(ctx); return -1; } @@ - ctx->stream_metrics = vivo_stream_create(ctx); - if (!ctx->stream_metrics) { - return -1; - } + ctx->stream_metrics = vivo_stream_create(ctx); + if (!ctx->stream_metrics) { vivo_stream_destroy(ctx->stream_logs); flb_free(ctx); return -1; } @@ - ctx->stream_traces = vivo_stream_create(ctx); - if (!ctx->stream_traces) { - return -1; - } + ctx->stream_traces = vivo_stream_create(ctx); + if (!ctx->stream_traces) { + vivo_stream_destroy(ctx->stream_metrics); + vivo_stream_destroy(ctx->stream_logs); + flb_free(ctx); + return -1; + } @@ - if (!ctx->http) { - flb_plg_error(ctx->ins, "could not initialize HTTP server, aborting"); - return -1; - } + if (!ctx->http) { + flb_plg_error(ctx->ins, "could not initialize HTTP server, aborting"); + vivo_stream_destroy(ctx->stream_traces); + vivo_stream_destroy(ctx->stream_metrics); + vivo_stream_destroy(ctx->stream_logs); + flb_free(ctx); + return -1; + } @@ - ret = vivo_http_server_start(ctx->http); - if (ret == -1) { - return -1; - } + ret = vivo_http_server_start(ctx->http); + if (ret == -1) { + vivo_http_server_destroy(ctx->http); + vivo_stream_destroy(ctx->stream_traces); + vivo_stream_destroy(ctx->stream_metrics); + vivo_stream_destroy(ctx->stream_logs); + flb_free(ctx); + return -1; + }
🧹 Nitpick comments (8)
plugins/out_vivo_exporter/vivo_stream.c (1)
148-154: Minor: prealloc without lock may under-size bufferbuf = flb_sds_create_size(vs->current_bytes_size) is done before taking stream_mutex; size may grow meanwhile. Harmless due to flb_sds_cat_safe reallocation, but move read under lock for tighter sizing if this is hot.
plugins/out_vivo_exporter/vivo.c (2)
32-53: Use memcmp for MsgPack raw string keysKeys are length-delimited; memcmp avoids any surprises with embedded NULs.
- if (map->via.map.ptr[i].key.via.str.size == key_len && - strncmp(map->via.map.ptr[i].key.via.str.ptr, key, key_len) == 0) { + if (map->via.map.ptr[i].key.via.str.size == key_len && + memcmp(map->via.map.ptr[i].key.via.str.ptr, key, key_len) == 0) {
87-92: Remove unused out_buf and handle newline append failureout_buf is allocated but never used; also check flb_sds_cat_safe result.
@@ - flb_sds_t out_buf = NULL; @@ - out_buf = flb_sds_create_size((event_chunk->size * 2) / 4); - if (!out_buf) { - flb_errno(); - return NULL; - } @@ - /* append a newline */ - flb_sds_cat_safe(&out_js, "\n", 1); + /* append a newline */ + if (flb_sds_cat_safe(&out_js, "\n", 1) < 0) { + flb_sds_destroy(out_js); + return NULL; + } @@ - if (!out_js) { - flb_sds_destroy(out_buf); - return NULL; - } - - /* Replace out_buf with the complete JSON */ - flb_sds_destroy(out_buf); - return out_js; + return out_js;Also applies to: 274-291, 280-286
plugins/out_vivo_exporter/vivo_http.c (5)
69-91: CORS and Content-Type centralization is good; add Authorization to allowed headers.
Most clients send Authorization; current allow-list would block it on preflight.Apply:
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); + "Origin, X-Requested-With, Content-Type, Accept, Authorization", + sizeof("Origin, X-Requested-With, Content-Type, Accept, Authorization") - 1);
92-109: Expose-headers: use exact header names as sent on the wire.
The list uses lowercase while actual headers use macro-defined names (likely “Vivo-Stream-*”). Case-insensitive matching usually works, but align for clarity.mk_http_header(request, "Access-Control-Expose-Headers", sizeof("Access-Control-Expose-Headers") - 1, - "vivo-stream-start-id, vivo-stream-end-id, vivo-stream-next-id", - sizeof("vivo-stream-start-id, vivo-stream-end-id, vivo-stream-next-id") - 1); + "Vivo-Stream-Start-ID, Vivo-Stream-End-ID, Vivo-Stream-Next-ID", + sizeof("Vivo-Stream-Start-ID, Vivo-Stream-End-ID, Vivo-Stream-Next-ID") - 1);
149-154: Empty payload: consider 204 No Content.
You set 200 then return without a body. 204 better signals emptiness; clients still read the Vivo-Stream-Next-ID header you already set.- if (flb_sds_len(payload) == 0) { - flb_sds_destroy(payload); - flb_sds_destroy(str_next); - return; - } + if (flb_sds_len(payload) == 0) { + flb_sds_destroy(payload); + mk_http_status(request, 204); + return; + }(If you keep 200 for compatibility, ignore.)
Please confirm client expectations regarding status code when no entries are available.
214-259: Internal metrics endpoint: good; add Cache-Control: no-store and small nits.
Avoid intermediary caches for ephemeral metrics; keep headers consistent with JSON response.mk_http_status(request, 200); headers_set_common(ctx, request); + mk_http_header(request, + "Cache-Control", sizeof("Cache-Control") - 1, + "no-store", sizeof("no-store") - 1); mk_http_send(request, json, flb_sds_len(json), NULL); mk_http_done(request);Optional: If cmetrics supports direct JSON encoding, you can bypass msgpack->json conversion for efficiency.
I can provide a version using the cmetrics JSON encoder if desired.
305-308: Consider backward-compatibility strategy for API endpoint change.The breaking change is confirmed: commit b2b5ce0 renamed endpoints from
/logs,/metrics,/tracesto/api/v1/logs,/api/v1/metrics,/api/v1/traces. Adding temporary backward-compatibility aliases is a recommended best practice for smooth client migration.However, no external documentation or examples referencing the old vivo exporter endpoints were found in the codebase, suggesting limited external client impact. The aliases remain a good practice but may be optional depending on your versioning and stability commitments.
mk_vhost_handler(ph->ctx, vid, "/api/v1/logs", cb_logs, ctx); mk_vhost_handler(ph->ctx, vid, "/api/v1/metrics", cb_metrics, ctx); mk_vhost_handler(ph->ctx, vid, "/api/v1/traces", cb_traces, ctx); mk_vhost_handler(ph->ctx, vid, "/api/v1/internal/metrics", cb_internal_metrics, ctx); + /* Temporary backward-compat aliases (remove in a future major release) */ + 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);
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📒 Files selected for processing (6)
plugins/out_vivo_exporter/vivo.c(4 hunks)plugins/out_vivo_exporter/vivo.h(2 hunks)plugins/out_vivo_exporter/vivo_http.c(5 hunks)plugins/out_vivo_exporter/vivo_http.h(2 hunks)plugins/out_vivo_exporter/vivo_stream.c(3 hunks)plugins/out_vivo_exporter/vivo_stream.h(1 hunks)
🧰 Additional context used
🧬 Code graph analysis (3)
plugins/out_vivo_exporter/vivo_http.h (1)
plugins/out_vivo_exporter/vivo_http.c (1)
vivo_http_serve_content(111-178)
plugins/out_vivo_exporter/vivo.c (5)
src/flb_mp.c (6)
flb_mp_map_header_init(316-328)flb_mp_map_header_append(345-349)flb_mp_array_header_init(330-342)flb_mp_array_header_append(351-355)flb_mp_array_header_end(367-375)flb_mp_map_header_end(357-365)src/flb_input.c (1)
flb_input_name(790-797)src/flb_log_event_decoder.c (2)
flb_log_event_decoder_next(310-406)flb_log_event_decoder_destroy(147-179)src/flb_pack.c (1)
flb_msgpack_raw_to_json_sds(1026-1085)src/flb_sds.c (2)
flb_sds_cat_safe(204-214)flb_sds_destroy(389-399)
plugins/out_vivo_exporter/vivo_http.c (4)
plugins/out_vivo_exporter/vivo_stream.c (1)
vivo_stream_get_content(137-201)src/flb_sds.c (3)
flb_sds_create_size(92-95)flb_sds_printf(336-387)flb_sds_destroy(389-399)src/flb_metrics_exporter.c (1)
flb_me_get_cmetrics(266-372)src/flb_pack.c (1)
flb_msgpack_raw_to_json_sds(1026-1085)
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🔇 Additional comments (6)
plugins/out_vivo_exporter/vivo.h (1)
26-27: ctx->config pointer added — clarify ownership/lifetimeLooks good. Please document that vivo_exporter does not own struct flb_config (valid until cb_vivo_exit) to avoid misuse later.
Also applies to: 45-46
plugins/out_vivo_exporter/vivo_http.h (1)
28-33: New stream ID headers and public serve helper — LGTMHeader names and prototype align with vivo_http.c usage. No issues spotted.
Also applies to: 62-63
plugins/out_vivo_exporter/vivo_stream.h (1)
55-59: API change verification complete - all call sites correctly updatedThe signature change is properly integrated:
- All declarations in the header (vivo_stream.h:55-58) and implementation (vivo_stream.c:137-140) include stream_next_id parameter
- The single call site in vivo_http.c:129-131 correctly passes &stream_next_id
- The implementation correctly assigns vs->entries_added to stream_next_id (line 164)
The optional documentation suggestion remains unimplemented—no inline comments explain that stream_next_id represents the next entry ID counter (set from vs->entries_added).
plugins/out_vivo_exporter/vivo_http.c (3)
22-26: Includes look appropriate for new functionality.
Required headers for config, msgpack-to-JSON, and cmetrics encoding are correctly added.
142-148: No issues found—VIVO_STREAM_NEXT_ID is properly defined and correctly used.The macro is defined in vivo_http.h (line 30) as
#define VIVO_STREAM_NEXT_ID "Vivo-Stream-Next-ID", and it's used correctly in vivo_http.c (line 146). The header name casing follows proper HTTP header conventions. All related stream ID macros (START, END, NEXT) are defined consistently and used throughout the codebase.
111-118: No issues found; all call sites properly finalize responses.Verification shows all three call sites of
vivo_http_serve_content()correctly callmk_http_done()immediately after invocation (lines 187–188, 198–199, 209–210). No non-callback callers were discovered. The function's contract is being honored in the current codebase.
| str_next = flb_sds_create_size(32); | ||
| flb_sds_printf(&str_next, "%" PRId64, stream_next_id); | ||
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| mk_http_header(request, | ||
| VIVO_STREAM_NEXT_ID, sizeof(VIVO_STREAM_NEXT_ID) - 1, | ||
| str_next, flb_sds_len(str_next)); | ||
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Possible NULL deref from unchecked flb_sds_printf; use stack buffers.
flb_sds_printf can return NULL on allocation failure; passing NULL to flb_sds_len/mk_http_header can crash. Same pattern exists for start/end IDs.
Replace all three sds prints with snprintf stack buffers:
- str_next = flb_sds_create_size(32);
- flb_sds_printf(&str_next, "%" PRId64, stream_next_id);
- mk_http_header(request,
- VIVO_STREAM_NEXT_ID, sizeof(VIVO_STREAM_NEXT_ID) - 1,
- str_next, flb_sds_len(str_next));
+ {
+ char next_buf[32];
+ int next_len = snprintf(next_buf, sizeof(next_buf), "%" PRId64, stream_next_id);
+ if (next_len < 0) { mk_http_status(request, 500); return; }
+ mk_http_header(request, VIVO_STREAM_NEXT_ID, sizeof(VIVO_STREAM_NEXT_ID) - 1,
+ next_buf, (size_t) next_len);
+ }- 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));
+ {
+ char start_buf[32], end_buf[32];
+ int start_len = snprintf(start_buf, sizeof(start_buf), "%" PRId64, stream_start_id);
+ int end_len = snprintf(end_buf, sizeof(end_buf), "%" PRId64, stream_end_id);
+ if (start_len < 0 || end_len < 0) { mk_http_status(request, 500); return; }
+ mk_http_header(request, VIVO_STREAM_START_ID, sizeof(VIVO_STREAM_START_ID) - 1,
+ start_buf, (size_t) start_len);
+ mk_http_header(request, VIVO_STREAM_END_ID, sizeof(VIVO_STREAM_END_ID) - 1,
+ end_buf, (size_t) end_len);
+ }Also remove now-unneeded flb_sds_destroy(str_start/str_end/str_next).
Also applies to: 156-168
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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.
Summary by CodeRabbit
New Features
/api/v1/logs,/api/v1/metrics,/api/v1/traces)Improvements