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filter_lua: expose env variables in FLB_ENV Lua table #9617

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Merged
merged 1 commit into from
Nov 27, 2024
Merged

filter_lua: expose env variables in FLB_ENV Lua table #9617

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30 changes: 30 additions & 0 deletions plugins/filter_lua/lua.c
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Original file line number Diff line number Diff line change
Expand Up @@ -27,8 +27,10 @@
#include <fluent-bit/flb_pack.h>
#include <fluent-bit/flb_sds.h>
#include <fluent-bit/flb_time.h>
#include <fluent-bit/flb_env.h>
#include <fluent-bit/flb_log_event_decoder.h>
#include <fluent-bit/flb_log_event_encoder.h>

#include <msgpack.h>

#include "fluent-bit/flb_mem.h"
Expand Down Expand Up @@ -76,6 +78,31 @@ static int cb_lua_pre_run(struct flb_filter_instance *f_ins,
return ret;
}

static int env_variables(struct flb_config *config, struct flb_luajit *lj)
{
struct mk_list *list;
struct mk_list *head;
struct flb_env *env;
struct flb_hash_table_entry *entry;

lua_newtable(lj->state);

env = (struct flb_env *) config->env;
list = (struct mk_list *) &env->ht->entries;
mk_list_foreach(head, list) {
entry = mk_list_entry(head, struct flb_hash_table_entry, _head_parent);
if (entry->val_size <= 0) {
continue;
}
lua_pushlstring(lj->state, entry->key, entry->key_len);
lua_pushlstring(lj->state, entry->val, entry->val_size);
lua_settable(lj->state, -3);
}

lua_setglobal(lj->state, "FLB_ENV");
return 0;
}

static int cb_lua_init(struct flb_filter_instance *f_ins,
struct flb_config *config,
void *data)
Expand All @@ -101,6 +128,9 @@ static int cb_lua_init(struct flb_filter_instance *f_ins,
}
ctx->lua = lj;

/* register environment variables */
env_variables(config, lj);

if (ctx->enable_flb_null) {
flb_lua_enable_flb_null(lj->state);
}
Expand Down
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