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Chat history.

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This commit is contained in:
Jacob Signorovitch
2026-02-14 22:29:32 -05:00
parent 766510132b
commit 2e8672fc9e
3 changed files with 47 additions and 2 deletions
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30
server/src/chat.c
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@@ -12,6 +12,13 @@
static size_t next_msg_id = 1;
// History buffer for last 100 messages.
#define HISTORY_SIZE 100
static char* history[HISTORY_SIZE];
static size_t history_len[HISTORY_SIZE];
static size_t history_pos = 0;
static size_t history_count = 0;
#define CHAT_BUF_SIZE SESSION_CHAT_BUF_SIZE
/*
@@ -92,6 +99,7 @@ int cb_chat(
if (session_has_username(s)) {
yyjson_mut_val* uobj = yyjson_mut_obj(wdoc);
yyjson_mut_arr_add_val(wusers, uobj);
yyjson_mut_arr_add_val(wusers, uobj);
yyjson_mut_obj_add_uint(
wdoc, uobj, "id", session_get_id(s)
);
@@ -100,6 +108,19 @@ int cb_chat(
);
}
}
// Include last 100 messages in the welcome history array.
yyjson_mut_val* whist = yyjson_mut_arr(wdoc);
yyjson_mut_obj_add_val(wdoc, wdata, "history", whist);
for (size_t i = 0; i < history_count; ++i) {
size_t idx =
(history_pos + HISTORY_SIZE - history_count + i) %
HISTORY_SIZE;
// Append raw JSON string into history array.
yyjson_mut_val* raw = yyjson_mut_strn(
wdoc, history[idx], history_len[idx]
);
yyjson_mut_arr_add_val(whist, raw);
}
size_t out_len;
char* out = yyjson_mut_write(wdoc, 0, &out_len);
@@ -291,6 +312,15 @@ int cb_chat(
size_t out_len;
char* out = yyjson_mut_write(mdoc, 0, &out_len);
/* Store this msg-event JSON in the circular history buffer */
if (history_count == HISTORY_SIZE) {
free(history[history_pos]);
} else {
history_count++;
}
history[history_pos] = strdup(out);
history_len[history_pos] = out_len;
history_pos = (history_pos + 1) % HISTORY_SIZE;
size_t copy_len = out_len < SESSION_CHAT_BUF_SIZE
? out_len
: SESSION_CHAT_BUF_SIZE;