876 lines
22 KiB
C++
876 lines
22 KiB
C++
extern "C" {
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_http.h>
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}
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#include <grpc/support/log.h>
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#include <google/protobuf/stubs/logging.h>
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#include "str_view.hpp"
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#include "trace_context.hpp"
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#include "batch_exporter.hpp"
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extern ngx_module_t gHttpModule;
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namespace {
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struct OtelCtx {
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TraceContext parent;
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TraceContext current;
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};
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struct MainConf {
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ngx_str_t endpoint;
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ngx_msec_t interval;
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size_t batchSize;
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size_t batchCount;
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ngx_str_t serviceName;
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};
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struct SpanAttr {
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ngx_str_t name;
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ngx_http_complex_value_t value;
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};
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struct LocationConf {
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ngx_http_complex_value_t* trace;
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ngx_uint_t traceContext;
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ngx_http_complex_value_t* spanName;
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ngx_array_t spanAttrs;
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};
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char* setExporter(ngx_conf_t* cf, ngx_command_t* cmd, void* conf);
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char* addSpanAttr(ngx_conf_t* cf, ngx_command_t* cmd, void* conf);
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namespace Propagation {
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const ngx_uint_t Extract = 1;
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const ngx_uint_t Inject = 2;
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/*const*/ ngx_conf_enum_t Types[] = {
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{ ngx_string("ignore"), 0 },
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{ ngx_string("extract"), Extract },
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{ ngx_string("inject"), Inject },
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{ ngx_string("propagate"), Extract | Inject },
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{ ngx_null_string, 0 }
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};
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}
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ngx_command_t gCommands[] = {
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{ ngx_string("otel_exporter"),
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NGX_HTTP_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_NOARGS,
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setExporter,
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NGX_HTTP_MAIN_CONF_OFFSET },
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{ ngx_string("otel_service_name"),
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NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE1,
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ngx_conf_set_str_slot,
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NGX_HTTP_MAIN_CONF_OFFSET,
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offsetof(MainConf, serviceName) },
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{ ngx_string("otel_trace"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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ngx_http_set_complex_value_slot,
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NGX_HTTP_LOC_CONF_OFFSET,
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offsetof(LocationConf, trace) },
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{ ngx_string("otel_trace_context"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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ngx_conf_set_enum_slot,
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NGX_HTTP_LOC_CONF_OFFSET,
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offsetof(LocationConf, traceContext),
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&Propagation::Types },
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{ ngx_string("otel_span_name"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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ngx_http_set_complex_value_slot,
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NGX_HTTP_LOC_CONF_OFFSET,
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offsetof(LocationConf, spanName) },
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{ ngx_string("otel_span_attr"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2,
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addSpanAttr,
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NGX_HTTP_LOC_CONF_OFFSET },
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ngx_null_command
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};
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ngx_command_t gExporterCommands[] = {
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{ ngx_string("endpoint"),
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NGX_CONF_TAKE1,
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ngx_conf_set_str_slot,
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0,
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offsetof(MainConf, endpoint) },
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{ ngx_string("interval"),
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NGX_CONF_TAKE1,
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ngx_conf_set_msec_slot,
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0,
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offsetof(MainConf, interval) },
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{ ngx_string("batch_size"),
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NGX_CONF_TAKE1,
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ngx_conf_set_size_slot,
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0,
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offsetof(MainConf, batchSize) },
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{ ngx_string("batch_count"),
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NGX_CONF_TAKE1,
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ngx_conf_set_size_slot,
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0,
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offsetof(MainConf, batchCount) },
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ngx_null_command
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};
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std::unique_ptr<BatchExporter> gExporter;
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StrView toStrView(ngx_str_t str)
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{
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return StrView((char*)str.data, str.len);
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}
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ngx_str_t toNgxStr(StrView str)
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{
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return ngx_str_t{str.size(), (u_char*)str.data()};
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}
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LocationConf* getLocationConf(ngx_http_request_t* r)
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{
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return (LocationConf*)ngx_http_get_module_loc_conf(r, gHttpModule);
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}
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void cleanupOtelCtx(void* data)
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{
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}
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OtelCtx* getOtelCtx(ngx_http_request_t* r)
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{
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auto ctx = (OtelCtx*)ngx_http_get_module_ctx(r, gHttpModule);
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// restore module context if it was reset by e.g. internal redirect
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if (ctx == NULL && (r->internal || r->filter_finalize)) {
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for (auto cln = r->pool->cleanup; cln; cln = cln->next) {
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if (cln->handler == cleanupOtelCtx) {
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ctx = (OtelCtx*)cln->data;
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ngx_http_set_ctx(r, ctx, gHttpModule);
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break;
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}
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}
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}
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return ctx;
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}
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OtelCtx* createOtelCtx(ngx_http_request_t* r)
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{
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static_assert(std::is_trivially_destructible<OtelCtx>::value, "");
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auto storage = ngx_pool_cleanup_add(r->pool, sizeof(OtelCtx));
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if (storage == NULL) {
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return NULL;
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}
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storage->handler = cleanupOtelCtx;
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auto ctx = new (storage->data) OtelCtx{};
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ngx_http_set_ctx(r, ctx, gHttpModule);
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return ctx;
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}
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ngx_table_elt_t* findHeader(ngx_list_t* list, ngx_uint_t hash, StrView key)
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{
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auto part = &list->part;
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auto elts = (ngx_table_elt_t*)part->elts;
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for (ngx_uint_t i = 0; /* void */; i++) {
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if (i >= part->nelts) {
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if (part->next == NULL) {
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break;
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}
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part = part->next;
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elts = (ngx_table_elt_t*)part->elts;
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i = 0;
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}
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if (elts[i].hash != hash || elts[i].key.len != key.size() ||
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ngx_memcmp(elts[i].lowcase_key, key.data(), key.size()) != 0) {
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continue;
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}
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return &elts[i];
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}
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return NULL;
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}
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StrView getHeader(ngx_http_request_t* r, StrView name)
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{
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auto hash = ngx_hash_key((u_char*)name.data(), name.size());
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auto header = findHeader(&r->headers_in.headers, hash, name);
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return header ? toStrView(header->value) : StrView{};
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}
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ngx_int_t updateRequestHeader(ngx_http_request_t* r, ngx_table_elt_t* header)
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{
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auto cmcf = (ngx_http_core_main_conf_t*)
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ngx_http_get_module_main_conf(r, ngx_http_core_module);
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auto hh = (ngx_http_header_t*)ngx_hash_find(&cmcf->headers_in_hash,
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header->hash, header->lowcase_key, header->key.len);
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return hh ? hh->handler(r, header, hh->offset) : NGX_OK;
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}
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ngx_int_t setHeader(ngx_http_request_t* r, StrView name, StrView value)
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{
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auto hash = ngx_hash_key((u_char*)name.data(), name.size());
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auto header = findHeader(&r->headers_in.headers, hash, name);
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if (header == NULL) {
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if (value.empty()) {
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return NGX_OK;
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}
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header = (ngx_table_elt_t*)ngx_list_push(&r->headers_in.headers);
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if (header == NULL) {
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return NGX_ERROR;
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}
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header->hash = hash;
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header->key = toNgxStr(name);
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header->lowcase_key = header->key.data;
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header->next = NULL;
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}
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header->value = toNgxStr(value);
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return updateRequestHeader(r, header);
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}
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TraceContext extract(ngx_http_request_t* r)
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{
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auto parent = getHeader(r, "traceparent");
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auto state = getHeader(r, "tracestate");
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return TraceContext::parse(parent, state);
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}
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ngx_int_t inject(ngx_http_request_t* r, const TraceContext& tc)
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{
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auto buf = (char*)ngx_pnalloc(r->pool, TraceContext::Size);
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if (buf == NULL) {
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return NGX_ERROR;
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}
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TraceContext::serialize(tc, buf);
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auto rc = setHeader(r, "traceparent", {buf, TraceContext::Size});
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if (rc != NGX_OK) {
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return rc;
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}
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return setHeader(r, "tracestate", tc.state);
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}
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OtelCtx* ensureOtelCtx(ngx_http_request_t* r)
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{
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auto ctx = getOtelCtx(r);
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if (ctx) {
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return ctx;
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}
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ctx = createOtelCtx(r);
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if (!ctx) {
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return NULL;
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}
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auto lcf = getLocationConf(r);
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if (lcf->traceContext & Propagation::Extract) {
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ctx->parent = extract(r);
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}
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ctx->current = TraceContext::generate(false, ctx->parent);
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return ctx;
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}
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ngx_int_t onRequestStart(ngx_http_request_t* r)
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{
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// don't let internal redirects to override sampling decision
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if (r->internal) {
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return NGX_DECLINED;
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}
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bool sampled = false;
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auto lcf = getLocationConf(r);
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if (lcf->trace != NULL) {
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ngx_str_t trace;
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if (ngx_http_complex_value(r, lcf->trace, &trace) != NGX_OK) {
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return NGX_ERROR;
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}
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sampled = toStrView(trace) == "on" || toStrView(trace) == "1";
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}
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if (!lcf->traceContext && !sampled) {
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return NGX_DECLINED;
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}
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auto ctx = ensureOtelCtx(r);
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if (!ctx) {
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return NGX_ERROR;
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}
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ctx->current.sampled = sampled;
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ngx_int_t rc = NGX_OK;
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if (lcf->traceContext & Propagation::Inject) {
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rc = inject(r, ctx->current);
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}
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return rc == NGX_OK ? NGX_DECLINED : rc;
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}
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StrView getServerName(ngx_http_request_t* r)
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{
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auto cscf = (ngx_http_core_srv_conf_t*)
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ngx_http_get_module_srv_conf(r, ngx_http_core_module);
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auto name = cscf->server_name;
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if (name.len == 0) {
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name = r->headers_in.server;
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}
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return toStrView(name);
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}
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void addDefaultAttrs(BatchExporter::Span& span, ngx_http_request_t* r)
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{
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// based on trace semantic conventions for HTTP from 1.16.0 OTel spec
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span.add("http.method", toStrView(r->method_name));
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span.add("http.target", toStrView(r->unparsed_uri));
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auto clcf = (ngx_http_core_loc_conf_t*)
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ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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if (clcf->name.len) {
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span.add("http.route", toStrView(clcf->name));
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}
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span.add("http.scheme", r->connection->ssl ? "https" : "http");
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auto protocol = toStrView(r->http_protocol);
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if (protocol.size() > 5) { // "HTTP/"
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span.add("http.flavor", protocol.substr(5));
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}
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if (r->headers_in.user_agent) {
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span.add("http.user_agent", toStrView(r->headers_in.user_agent->value));
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}
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auto received = r->headers_in.content_length_n;
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span.add("http.request_content_length", received > 0 ? received : 0);
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auto sent = r->connection->sent - (off_t)r->header_size;
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span.add("http.response_content_length", sent > 0 ? sent : 0);
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auto status = r->err_status ? r->err_status : r->headers_out.status;
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if (status) {
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span.add("http.status_code", status);
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if (status >= 500) {
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span.setError();
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}
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}
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span.add("net.host.name", getServerName(r));
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if (ngx_connection_local_sockaddr(r->connection, NULL, 0) == NGX_OK) {
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auto port = ngx_inet_get_port(r->connection->local_sockaddr);
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auto defaultPort = r->connection->ssl ? 443 : 80;
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if (port != defaultPort) {
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span.add("net.host.port", port);
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}
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}
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span.add("net.sock.peer.addr", toStrView(r->connection->addr_text));
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span.add("net.sock.peer.port", ngx_inet_get_port(r->connection->sockaddr));
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}
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StrView getSpanName(ngx_http_request_t* r)
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{
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auto lcf = getLocationConf(r);
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if (lcf->spanName) {
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ngx_str_t result;
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if (ngx_http_complex_value(r, lcf->spanName, &result) != NGX_OK) {
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throw std::runtime_error("failed to compute complex value");
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}
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return toStrView(result);
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} else {
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auto clcf = (ngx_http_core_loc_conf_t*)
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ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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return toStrView(clcf->name);
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}
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}
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void addCustomAttrs(BatchExporter::Span& span, ngx_http_request_t* r)
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{
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auto lcf = getLocationConf(r);
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auto attrs = (SpanAttr*)lcf->spanAttrs.elts;
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for (ngx_uint_t i = 0; i < lcf->spanAttrs.nelts; i++) {
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ngx_str_t value;
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if (ngx_http_complex_value(r, &attrs[i].value, &value) != NGX_OK) {
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throw std::runtime_error("failed to compute complex value");
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}
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StrView name = toStrView(attrs[i].name);
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if (startsWith(name, "http.request.header.") ||
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startsWith(name, "http.response.header."))
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{
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//TODO: remove this once headers are supported natively
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span.addArray(name, toStrView(value));
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} else {
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span.add(name, toStrView(value));
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}
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}
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}
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ngx_int_t onRequestEnd(ngx_http_request_t* r)
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{
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auto ctx = getOtelCtx(r);
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if (!ctx || !ctx->current.sampled) {
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return NGX_DECLINED;
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}
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auto now = ngx_timeofday();
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auto toNanoSec = [](time_t sec, ngx_msec_t msec) -> uint64_t {
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return (sec * 1000 + msec) * 1000000;
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};
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try {
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BatchExporter::SpanInfo info{
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getSpanName(r), ctx->current, ctx->parent.spanId,
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toNanoSec(r->start_sec, r->start_msec),
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toNanoSec(now->sec, now->msec)};
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bool ok = gExporter->add(info, [r](BatchExporter::Span& span) {
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addDefaultAttrs(span, r);
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addCustomAttrs(span, r);
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});
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if (!ok) {
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static size_t dropped = 0;
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static time_t lastLog = 0;
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++dropped;
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if (lastLog != ngx_time()) {
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lastLog = ngx_time();
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ngx_log_error(NGX_LOG_NOTICE, r->connection->log, 0,
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"OTel dropped records: %uz", dropped);
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}
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}
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} catch (const std::exception& e) {
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ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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"OTel failed to add span: %s", e.what());
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return NGX_ERROR;
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}
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return NGX_DECLINED;
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}
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void grpcLogHandler(gpr_log_func_args* args)
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{
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ngx_uint_t level = args->severity == GPR_LOG_SEVERITY_ERROR ? NGX_LOG_ERR :
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args->severity == GPR_LOG_SEVERITY_INFO ? NGX_LOG_INFO :
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/*GPR_LOG_SEVERITY_DEBUG*/ NGX_LOG_DEBUG;
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ngx_log_error(level, ngx_cycle->log, 0, "OTel/grpc: %s", args->message);
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}
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void protobufLogHandler(google::protobuf::LogLevel logLevel,
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const char* filename, int line, const std::string& msg)
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{
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using namespace google::protobuf;
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ngx_uint_t level = logLevel == LOGLEVEL_FATAL ? NGX_LOG_EMERG :
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logLevel == LOGLEVEL_ERROR ? NGX_LOG_ERR :
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logLevel == LOGLEVEL_WARNING ? NGX_LOG_WARN :
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/*LOGLEVEL_INFO*/ NGX_LOG_INFO;
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ngx_log_error(level, ngx_cycle->log, 0, "OTel/protobuf: %s", msg.c_str());
|
|
}
|
|
|
|
ngx_int_t initModule(ngx_conf_t* cf)
|
|
{
|
|
auto cmcf = (ngx_http_core_main_conf_t*)ngx_http_conf_get_module_main_conf(
|
|
cf, ngx_http_core_module);
|
|
|
|
auto h = (ngx_http_handler_pt*)ngx_array_push(
|
|
&cmcf->phases[NGX_HTTP_REWRITE_PHASE].handlers);
|
|
if (h == NULL) {
|
|
return NGX_ERROR;
|
|
}
|
|
|
|
*h = onRequestStart;
|
|
|
|
h = (ngx_http_handler_pt*)ngx_array_push(
|
|
&cmcf->phases[NGX_HTTP_LOG_PHASE].handlers);
|
|
if (h == NULL) {
|
|
return NGX_ERROR;
|
|
}
|
|
|
|
*h = onRequestEnd;
|
|
|
|
gpr_set_log_function(grpcLogHandler);
|
|
google::protobuf::SetLogHandler(protobufLogHandler);
|
|
|
|
return NGX_OK;
|
|
}
|
|
|
|
ngx_int_t initWorkerProcess(ngx_cycle_t* cycle)
|
|
{
|
|
auto mcf = (MainConf*)ngx_http_cycle_get_module_main_conf(
|
|
cycle, gHttpModule);
|
|
|
|
// no 'http' or 'otel_exporter' blocks
|
|
if (mcf == NULL || mcf->endpoint.len == 0) {
|
|
return NGX_OK;
|
|
}
|
|
|
|
try {
|
|
gExporter.reset(new BatchExporter(
|
|
toStrView(mcf->endpoint),
|
|
mcf->batchSize,
|
|
mcf->batchCount,
|
|
toStrView(mcf->serviceName)));
|
|
} catch (const std::exception& e) {
|
|
ngx_log_error(NGX_LOG_CRIT, cycle->log, 0,
|
|
"OTel worker init error: %s", e.what());
|
|
return NGX_ERROR;
|
|
}
|
|
|
|
static ngx_connection_t dummy;
|
|
static ngx_event_t flushEvent;
|
|
|
|
flushEvent.data = &dummy;
|
|
flushEvent.log = cycle->log;
|
|
flushEvent.cancelable = 1;
|
|
flushEvent.handler = [](ngx_event_t* ev) {
|
|
try {
|
|
gExporter->flush();
|
|
} catch (const std::exception& e) {
|
|
ngx_log_error(NGX_LOG_CRIT, ev->log, 0,
|
|
"OTel flush error: %s", e.what());
|
|
}
|
|
|
|
auto mcf = (MainConf*)ngx_http_cycle_get_module_main_conf(
|
|
ngx_cycle, gHttpModule);
|
|
|
|
ngx_add_timer(ev, mcf->interval);
|
|
};
|
|
|
|
ngx_add_timer(&flushEvent, mcf->interval);
|
|
|
|
return NGX_OK;
|
|
}
|
|
|
|
void exitWorkerProcess(ngx_cycle_t* cycle)
|
|
{
|
|
if (!gExporter) {
|
|
return;
|
|
}
|
|
|
|
try {
|
|
gExporter->flush();
|
|
} catch (const std::exception& e) {
|
|
ngx_log_error(NGX_LOG_CRIT, cycle->log, 0,
|
|
"OTel flush error: %s", e.what());
|
|
}
|
|
|
|
gExporter.reset();
|
|
}
|
|
|
|
char* setExporter(ngx_conf_t* cf, ngx_command_t* cmd, void* conf)
|
|
{
|
|
auto mcf = (MainConf*)conf;
|
|
|
|
if (mcf->endpoint.len) {
|
|
return (char*)"is duplicate";
|
|
}
|
|
|
|
auto cfCopy = *cf;
|
|
|
|
cfCopy.handler = [](ngx_conf_t* cf, ngx_command_t*, void*) {
|
|
auto name = (ngx_str_t*)cf->args->elts;
|
|
|
|
for (auto cmd = gExporterCommands; cmd->name.len; cmd++) {
|
|
|
|
if (ngx_strcmp(name->data, cmd->name.data) != 0) {
|
|
continue;
|
|
}
|
|
|
|
if (cf->args->nelts != 2) {
|
|
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
"invalid number of arguments in \"%V\" "
|
|
"directive of \"otel_exporter\"", name);
|
|
return (char*)NGX_CONF_ERROR;
|
|
}
|
|
|
|
auto rv = cmd->set(cf, cmd, cf->handler_conf);
|
|
|
|
if (rv == NGX_CONF_OK) {
|
|
return rv;
|
|
}
|
|
|
|
if (rv != NGX_CONF_ERROR) {
|
|
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
"\"%V\" directive of \"otel_exporter\" %s", name, rv);
|
|
}
|
|
|
|
return (char*)NGX_CONF_ERROR;
|
|
}
|
|
|
|
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
"unknown directive \"%V\" in \"otel_exporter\"", name);
|
|
return (char*)NGX_CONF_ERROR;
|
|
};
|
|
|
|
cfCopy.handler_conf = mcf;
|
|
|
|
auto rv = ngx_conf_parse(&cfCopy, NULL);
|
|
if (rv != NGX_CONF_OK) {
|
|
return rv;
|
|
}
|
|
|
|
if (mcf->endpoint.len == 0) {
|
|
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
"\"otel_exporter\" requires \"endpoint\"");
|
|
return (char*)NGX_CONF_ERROR;
|
|
}
|
|
|
|
return NGX_CONF_OK;
|
|
}
|
|
|
|
void* createMainConf(ngx_conf_t* cf)
|
|
{
|
|
auto mcf = (MainConf*)ngx_pcalloc(cf->pool, sizeof(MainConf));
|
|
if (mcf == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
mcf->interval = NGX_CONF_UNSET_MSEC;
|
|
mcf->batchSize = NGX_CONF_UNSET_SIZE;
|
|
mcf->batchCount = NGX_CONF_UNSET_SIZE;
|
|
|
|
return mcf;
|
|
}
|
|
|
|
char* initMainConf(ngx_conf_t* cf, void* conf)
|
|
{
|
|
auto mcf = (MainConf*)conf;
|
|
|
|
|
|
ngx_conf_init_msec_value(mcf->interval, 5000);
|
|
ngx_conf_init_size_value(mcf->batchSize, 512);
|
|
ngx_conf_init_size_value(mcf->batchCount, 4);
|
|
|
|
if (mcf->serviceName.data == NULL) {
|
|
mcf->serviceName = ngx_string("unknown_service:nginx");
|
|
}
|
|
|
|
return NGX_CONF_OK;
|
|
}
|
|
|
|
char* addSpanAttr(ngx_conf_t* cf, ngx_command_t* cmd, void* conf)
|
|
{
|
|
auto lcf = (LocationConf*)conf;
|
|
|
|
if (lcf->spanAttrs.elts == NULL && ngx_array_init(&lcf->spanAttrs,
|
|
cf->pool, 4, sizeof(SpanAttr)) != NGX_OK) {
|
|
return (char*)NGX_CONF_ERROR;
|
|
}
|
|
|
|
auto attr = (SpanAttr*)ngx_array_push(&lcf->spanAttrs);
|
|
if (attr == NULL) {
|
|
return (char*)NGX_CONF_ERROR;
|
|
}
|
|
|
|
auto args = (ngx_str_t*)cf->args->elts;
|
|
|
|
attr->name = args[1];
|
|
|
|
ngx_http_compile_complex_value_t ccv = { cf, &args[2], &attr->value };
|
|
if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
|
|
return (char*)NGX_CONF_ERROR;
|
|
}
|
|
|
|
return NGX_CONF_OK;
|
|
}
|
|
|
|
template <class Id>
|
|
ngx_int_t hexIdVar(ngx_http_request_t* r, ngx_http_variable_value_t* v,
|
|
uintptr_t data)
|
|
{
|
|
auto ctx = ensureOtelCtx(r);
|
|
if (!ctx) {
|
|
return NGX_ERROR;
|
|
}
|
|
|
|
auto id = (Id*)((char*)ctx + data);
|
|
|
|
if (id->IsValid()) {
|
|
auto size = id->Id().size() * 2;
|
|
auto buf = (char*)ngx_pnalloc(r->pool, size);
|
|
if (buf == NULL) {
|
|
return NGX_ERROR;
|
|
}
|
|
|
|
id->ToLowerBase16({buf, size});
|
|
|
|
v->len = size;
|
|
v->valid = 1;
|
|
v->no_cacheable = 0;
|
|
v->not_found = 0;
|
|
v->data = (u_char*)buf;
|
|
|
|
} else {
|
|
v->not_found = 1;
|
|
}
|
|
|
|
return NGX_OK;
|
|
}
|
|
|
|
ngx_int_t parentSampledVar(ngx_http_request_t* r, ngx_http_variable_value_t* v,
|
|
uintptr_t data)
|
|
{
|
|
auto ctx = ensureOtelCtx(r);
|
|
if (!ctx) {
|
|
return NGX_ERROR;
|
|
}
|
|
|
|
v->len = 1;
|
|
v->valid = 1;
|
|
v->no_cacheable = 0;
|
|
v->not_found = 0;
|
|
v->data = (u_char*)(ctx->parent.sampled ? "1" : "0");
|
|
|
|
return NGX_OK;
|
|
}
|
|
|
|
ngx_int_t addVariables(ngx_conf_t* cf)
|
|
{
|
|
using namespace opentelemetry::trace;
|
|
|
|
ngx_http_variable_t vars[] = {
|
|
{ ngx_string("otel_trace_id"), NULL, hexIdVar<TraceId>,
|
|
offsetof(OtelCtx, current.traceId) },
|
|
|
|
{ ngx_string("otel_span_id"), NULL, hexIdVar<SpanId>,
|
|
offsetof(OtelCtx, current.spanId) },
|
|
|
|
{ ngx_string("otel_parent_id"), NULL, hexIdVar<SpanId>,
|
|
offsetof(OtelCtx, parent.spanId) },
|
|
|
|
{ ngx_string("otel_parent_sampled"), NULL, parentSampledVar }
|
|
};
|
|
|
|
for (auto& v : vars) {
|
|
auto var = ngx_http_add_variable(cf, &v.name, 0);
|
|
if (var == NULL) {
|
|
return NGX_ERROR;
|
|
}
|
|
var->get_handler = v.get_handler;
|
|
var->data = v.data;
|
|
}
|
|
|
|
return NGX_OK;
|
|
}
|
|
|
|
void* createLocationConf(ngx_conf_t* cf)
|
|
{
|
|
auto conf = (LocationConf*)ngx_pcalloc(cf->pool, sizeof(LocationConf));
|
|
if (conf == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
conf->trace = (ngx_http_complex_value_t*)NGX_CONF_UNSET_PTR;
|
|
conf->traceContext = NGX_CONF_UNSET_UINT;
|
|
conf->spanName = (ngx_http_complex_value_t*)NGX_CONF_UNSET_PTR;
|
|
|
|
return conf;
|
|
}
|
|
|
|
char* mergeLocationConf(ngx_conf_t* cf, void* parent, void* child)
|
|
{
|
|
auto prev = (LocationConf*)parent;
|
|
auto conf = (LocationConf*)child;
|
|
|
|
ngx_conf_merge_ptr_value(conf->trace, prev->trace, NULL);
|
|
ngx_conf_merge_uint_value(conf->traceContext, prev->traceContext, 0);
|
|
ngx_conf_merge_ptr_value(conf->spanName, prev->spanName, NULL);
|
|
|
|
if (conf->spanAttrs.elts == NULL) {
|
|
conf->spanAttrs = prev->spanAttrs;
|
|
}
|
|
|
|
auto mcf = (MainConf*)ngx_http_conf_get_module_main_conf(cf, gHttpModule);
|
|
|
|
if (mcf->endpoint.len == 0 && conf->trace) {
|
|
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
"\"otel_exporter\" block is missing");
|
|
return (char*)NGX_CONF_ERROR;
|
|
}
|
|
|
|
return NGX_CONF_OK;
|
|
}
|
|
|
|
ngx_http_module_t gHttpModuleCtx = {
|
|
addVariables, /* preconfiguration */
|
|
initModule, /* postconfiguration */
|
|
|
|
createMainConf, /* create main configuration */
|
|
initMainConf, /* init main configuration */
|
|
|
|
NULL, /* create server configuration */
|
|
NULL, /* merge server configuration */
|
|
|
|
createLocationConf, /* create location configuration */
|
|
mergeLocationConf /* merge location configuration */
|
|
};
|
|
|
|
}
|
|
|
|
ngx_module_t gHttpModule = {
|
|
NGX_MODULE_V1,
|
|
&gHttpModuleCtx, /* module context */
|
|
gCommands, /* module directives */
|
|
NGX_HTTP_MODULE, /* module type */
|
|
NULL, /* init master */
|
|
NULL, /* init module */
|
|
initWorkerProcess, /* init process */
|
|
NULL, /* init thread */
|
|
NULL, /* exit thread */
|
|
exitWorkerProcess, /* exit process */
|
|
NULL, /* exit master */
|
|
NGX_MODULE_V1_PADDING
|
|
};
|