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/*
* Copyright (c) 2023 Egor Tensin <Egor.Tensin@gmail.com>
* This file is part of the "cimple" project.
* For details, see https://github.com/egor-tensin/cimple.
* Distributed under the MIT License.
*/
#include "command.h"
#include "compiler.h"
#include "event_loop.h"
#include "json_rpc.h"
#include "log.h"
#include <poll.h>
#include <stdlib.h>
#include <string.h>
struct cmd_dispatcher {
struct cmd_desc *cmds;
size_t numof_cmds;
void *ctx;
};
static int copy_cmd(struct cmd_desc *dest, const struct cmd_desc *src)
{
dest->name = strdup(src->name);
if (!dest->name) {
log_errno("strdup");
return -1;
}
dest->handler = src->handler;
return 0;
}
static void free_cmd(struct cmd_desc *desc)
{
free(desc->name);
}
static int copy_cmds(struct cmd_desc *dest, const struct cmd_desc *src, size_t numof_cmds)
{
size_t numof_copied = 0;
int ret = 0;
for (numof_copied = 0; numof_copied < numof_cmds; ++numof_copied) {
ret = copy_cmd(&dest[numof_copied], &src[numof_copied]);
if (ret < 0)
goto free;
}
return 0;
free:
for (size_t i = 0; i < numof_copied; ++i)
free_cmd(&dest[numof_copied]);
return -1;
}
static void free_cmds(struct cmd_desc *cmds, size_t numof_cmds)
{
for (size_t i = 0; i < numof_cmds; ++i)
free_cmd(&cmds[i]);
}
int cmd_dispatcher_create(struct cmd_dispatcher **_dispatcher, struct cmd_desc *cmds,
size_t numof_cmds, void *ctx)
{
int ret = 0;
struct cmd_dispatcher *dispatcher = malloc(sizeof(struct cmd_dispatcher));
if (!dispatcher) {
log_errno("malloc");
return -1;
}
dispatcher->ctx = ctx;
dispatcher->cmds = malloc(sizeof(struct cmd_desc) * numof_cmds);
if (!dispatcher->cmds) {
log_errno("malloc");
goto free;
}
dispatcher->numof_cmds = numof_cmds;
ret = copy_cmds(dispatcher->cmds, cmds, numof_cmds);
if (ret < 0)
goto free_cmds;
*_dispatcher = dispatcher;
return 0;
free_cmds:
free(dispatcher->cmds);
free:
free(dispatcher);
return -1;
}
void cmd_dispatcher_destroy(struct cmd_dispatcher *dispatcher)
{
free_cmds(dispatcher->cmds, dispatcher->numof_cmds);
free(dispatcher->cmds);
free(dispatcher);
}
static int cmd_dispatcher_handle_internal(const struct cmd_dispatcher *dispatcher,
const struct jsonrpc_request *request,
struct jsonrpc_response **result, void *arg)
{
const char *actual_cmd = jsonrpc_request_get_method(request);
for (size_t i = 0; i < dispatcher->numof_cmds; ++i) {
struct cmd_desc *cmd = &dispatcher->cmds[i];
if (strcmp(cmd->name, actual_cmd))
continue;
return cmd->handler(request, result, arg);
}
log_err("Received an unknown command: %s\n", actual_cmd);
return -1;
}
int cmd_dispatcher_handle(const struct cmd_dispatcher *dispatcher,
const struct jsonrpc_request *command, struct jsonrpc_response **result)
{
return cmd_dispatcher_handle_internal(dispatcher, command, result, dispatcher->ctx);
}
static struct cmd_conn_ctx *make_conn_ctx(int fd, void *arg)
{
struct cmd_conn_ctx *ctx = malloc(sizeof(struct cmd_conn_ctx));
if (!ctx) {
log_errno("malloc");
return NULL;
}
ctx->fd = fd;
ctx->arg = arg;
return ctx;
}
static int cmd_dispatcher_handle_conn_internal(int conn_fd, struct cmd_dispatcher *dispatcher)
{
int ret = 0;
struct cmd_conn_ctx *new_ctx = make_conn_ctx(conn_fd, dispatcher->ctx);
if (!new_ctx)
return -1;
struct jsonrpc_request *request = NULL;
ret = jsonrpc_request_recv(&request, conn_fd);
if (ret < 0)
goto free_ctx;
const int requires_response = !jsonrpc_request_is_notification(request);
struct jsonrpc_response *default_response = NULL;
if (requires_response) {
ret = jsonrpc_response_create(&default_response, request, NULL);
if (ret < 0)
goto free_request;
}
struct jsonrpc_response *default_error = NULL;
if (requires_response) {
ret = jsonrpc_error_create(&default_error, request, -1, "An error occured");
if (ret < 0)
goto free_default_response;
}
struct jsonrpc_response *response = NULL;
ret = cmd_dispatcher_handle_internal(dispatcher, request, &response, new_ctx);
if (requires_response) {
struct jsonrpc_response *actual_response = response;
if (!actual_response) {
actual_response = ret < 0 ? default_error : default_response;
}
if (ret < 0 && !jsonrpc_response_is_error(actual_response)) {
actual_response = default_error;
}
ret = jsonrpc_response_send(actual_response, conn_fd) < 0 ? -1 : ret;
}
if (response)
jsonrpc_response_destroy(response);
if (default_error)
jsonrpc_response_destroy(default_error);
free_default_response:
if (default_response)
jsonrpc_response_destroy(default_response);
free_request:
jsonrpc_request_destroy(request);
free_ctx:
free(new_ctx);
return ret;
}
int cmd_dispatcher_handle_conn(int conn_fd, void *_dispatcher)
{
return cmd_dispatcher_handle_conn_internal(conn_fd, (struct cmd_dispatcher *)_dispatcher);
}
int cmd_dispatcher_handle_event(UNUSED struct event_loop *loop, int fd, short revents,
void *_dispatcher)
{
if (!(revents & POLLIN)) {
log_err("Descriptor %d is not readable\n", fd);
return -1;
}
return cmd_dispatcher_handle_conn_internal(fd, (struct cmd_dispatcher *)_dispatcher);
}
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