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Add an endpoint that lists all the saved prompt caches to server #502

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merged 1 commit into from
Jun 7, 2025
Merged

Add an endpoint that lists all the saved prompt caches to server #502

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45 changes: 44 additions & 1 deletion examples/server/server.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3390,6 +3390,48 @@ int main(int argc, char ** argv) {
res.status = 200; // HTTP OK
};

const auto list_saved_prompts = [&ctx_server, &params](const httplib::Request& req, httplib::Response& res) {
res.set_header("Access-Control-Allow-Origin", req.get_header_value("Origin"));
json response = json::array();
namespace fs = std::filesystem;

try {
for (const auto& entry : fs::directory_iterator(params.slot_save_path)) {
if (!entry.is_regular_file() || entry.file_size() < 12) {
continue;
}

std::ifstream file(entry.path(), std::ios::binary);
if (!file) continue;

uint32_t magic, version, n_token_count;
file.read(reinterpret_cast<char*>(&magic), sizeof(magic));
file.read(reinterpret_cast<char*>(&version), sizeof(version));
file.read(reinterpret_cast<char*>(&n_token_count), sizeof(n_token_count));

if (magic != LLAMA_STATE_SEQ_MAGIC ||
version != LLAMA_STATE_SEQ_VERSION ||
entry.file_size() < (12 + (n_token_count * sizeof(llama_token)))) {
continue;
}

std::vector<llama_token> tokens(n_token_count);
file.read(reinterpret_cast<char*>(tokens.data()), tokens.size() * sizeof(llama_token));

response.push_back({
{"filename", entry.path().filename().string()},
{"filesize", entry.file_size()},
{"token_count", n_token_count},
{"prompt", tokens_to_str(ctx_server.ctx, tokens.cbegin(), tokens.cend())}
});
}
} catch (const std::exception& e) {
res.status = 500;
response = {{"error", e.what()}};
}
res.set_content(response.dump(), "application/json; charset=utf-8");
};

auto handle_static_file = [](unsigned char * content, size_t len, const char * mime_type) {
return [content, len, mime_type](const httplib::Request &, httplib::Response & res) {
res.set_content(reinterpret_cast<const char*>(content), len, mime_type);
Expand Down Expand Up @@ -3448,8 +3490,9 @@ int main(int argc, char ** argv) {
// Save & load slots
svr->Get ("/slots", handle_slots);
if (!params.slot_save_path.empty()) {
// only enable slot endpoints if slot_save_path is set
// these endpoints rely on slot_save_path existing
svr->Post("/slots/:id_slot", handle_slots_action);
svr->Get ("/list", list_saved_prompts);
}

//
Expand Down