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jim-redis.c
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jim-redis.c
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/*
* Simple redis interface
*
* (c) 2020 Steve Bennett <steveb@workware.net.au>
*
* See LICENSE for license details.
*/
#include <jim.h>
#include <jim-eventloop.h>
#include <unistd.h>
#include <hiredis.h>
/**
* Recursively decode a redis reply as Tcl data structure.
*/
static Jim_Obj *jim_redis_get_result(Jim_Interp *interp, redisReply *reply, int addtype)
{
int i;
Jim_Obj *obj;
switch (reply->type) {
case REDIS_REPLY_INTEGER:
obj = Jim_NewIntObj(interp, reply->integer);
break;
case REDIS_REPLY_STATUS:
case REDIS_REPLY_ERROR:
case REDIS_REPLY_STRING:
obj = Jim_NewStringObj(interp, reply->str, reply->len);
break;
case REDIS_REPLY_ARRAY:
obj = Jim_NewListObj(interp, NULL, 0);
for (i = 0; i < reply->elements; i++) {
Jim_ListAppendElement(interp, obj, jim_redis_get_result(interp, reply->element[i], addtype));
}
break;
case REDIS_REPLY_NIL:
obj = Jim_NewStringObj(interp, NULL, 0);
break;
default:
obj = Jim_NewStringObj(interp, "badtype", -1);
break;
}
if (addtype) {
const char *type;
switch (reply->type) {
case REDIS_REPLY_INTEGER:
type = "int";
break;
case REDIS_REPLY_STATUS:
type = "status";
break;
case REDIS_REPLY_ERROR:
type = "error";
break;
case REDIS_REPLY_STRING:
type = "str";
break;
case REDIS_REPLY_ARRAY:
type = "array";
break;
case REDIS_REPLY_NIL:
type = "nil";
break;
default:
type = "invalid";
break;
}
obj = Jim_NewListObj(interp, &obj, 1);
Jim_ListAppendElement(interp, obj, Jim_NewStringObj(interp, type, -1));
}
return obj;
}
static int jim_redis_write_callback(Jim_Interp *interp, void *clientData, int mask)
{
redisContext *c = clientData;
int done;
if (redisBufferWrite(c, &done) != REDIS_OK) {
return JIM_ERR;
}
if (done) {
/* Write has completed, so remove the callback */
Jim_DeleteFileHandler(interp, c->fd, mask);
}
return JIM_OK;
}
/**
* $r readable ?script?
* - set or clear a readable script
* $r close
* - close (delete) the handle
* $r read
* - synchronously read a SUBSCRIBE response (typically from within readable)
* $r <redis-command> ...
* - invoke the redis command and return the decoded result
*/
static int jim_redis_subcmd(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
int i;
redisContext *c = Jim_CmdPrivData(interp);
const char **args;
size_t *arglens;
int ret = JIM_OK;
int addtype = 0;
redisReply *reply;
if (argc >= 3 && Jim_CompareStringImmediate(interp, argv[1], "-type")) {
addtype = 1;
argc--;
argv++;
}
if (Jim_CompareStringImmediate(interp, argv[1], "readable")) {
/* Remove any existing handler */
Jim_DeleteFileHandler(interp, c->fd, JIM_EVENT_READABLE);
if (argc > 2) {
Jim_CreateScriptFileHandler(interp, c->fd, JIM_EVENT_READABLE, argv[2]);
}
return JIM_OK;
}
if (Jim_CompareStringImmediate(interp, argv[1], "close")) {
return Jim_DeleteCommand(interp, argv[0]);
}
if (Jim_CompareStringImmediate(interp, argv[1], "read")) {
int rc;
if (!(c->flags & REDIS_BLOCK)) {
redisBufferRead(c);
}
rc = redisGetReply(c, (void **)&reply);
if (rc != REDIS_OK) {
reply = NULL;
}
}
else {
int nargs = argc - 1;
args = Jim_Alloc(sizeof(*args) * nargs);
arglens = Jim_Alloc(sizeof(*arglens) * nargs);
for (i = 0; i < nargs; i++) {
args[i] = Jim_String(argv[i + 1]);
arglens[i] = Jim_Length(argv[i + 1]);
}
reply = redisCommandArgv(c, nargs, args, arglens);
Jim_Free(args);
Jim_Free(arglens);
if (!(c->flags & REDIS_BLOCK)) {
int done;
if (redisBufferWrite(c, &done) == REDIS_OK && !done) {
/* Couldn't write the entire command, so set up a writable callback to complete the job */
Jim_CreateFileHandler(interp, c->fd, JIM_EVENT_WRITABLE, jim_redis_write_callback, c, NULL);
}
}
}
/* sometimes commands return NULL */
if (reply) {
Jim_SetResult(interp, jim_redis_get_result(interp, reply, addtype));
if (reply->type == REDIS_REPLY_ERROR) {
ret = JIM_ERR;
}
freeReplyObject(reply);
}
else if (c->err) {
Jim_SetResultFormatted(interp, "%#s: %s", argv[1], c->errstr);
ret = JIM_ERR;
}
return ret;
}
static void jim_redis_del_proc(Jim_Interp *interp, void *privData)
{
redisContext *c = privData;
JIM_NOTUSED(interp);
Jim_DeleteFileHandler(interp, c->fd, JIM_EVENT_READABLE);
redisFree(c);
}
/**
* redis <socket-stream>
*
* Returns a handle that can be used to communicate with the redis
* instance over the socket.
* The original socket handle is closed.
*/
static int jim_redis_cmd(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
redisContext *c;
char buf[60];
Jim_Obj *objv[2];
long fd;
int ret;
int async = 0;
if (argc > 2 && Jim_CompareStringImmediate(interp, argv[1], "-async")) {
async = 1;
}
if (argc - async != 2) {
Jim_WrongNumArgs(interp, 1, argv, "?-async? socket-stream");
return JIM_ERR;
}
/* Invoke getfd to get the file descriptor */
objv[0] = argv[1 + async];
objv[1] = Jim_NewStringObj(interp, "getfd", -1);
ret = Jim_EvalObjVector(interp, 2, objv);
if (ret == JIM_OK) {
ret = Jim_GetLong(interp, Jim_GetResult(interp), &fd) == JIM_ERR;
}
if (ret != JIM_OK) {
Jim_SetResultFormatted(interp, "%#s: not a valid stream handle: %#s", argv[0], argv[1]);
return ret;
}
/* Note that we dup the file descriptor here so that we can close the original */
fd = dup(fd);
/* Can't fail */
c = redisConnectFd(fd);
if (async) {
c->flags &= ~REDIS_BLOCK;
}
/* Enable TCP_KEEPALIVE - this is the default for later redis versions */
redisEnableKeepAlive(c);
/* Now delete the original stream */
Jim_DeleteCommand(interp, argv[1 + async]);
snprintf(buf, sizeof(buf), "redis.handle%ld", Jim_GetId(interp));
Jim_CreateCommand(interp, buf, jim_redis_subcmd, c, jim_redis_del_proc);
Jim_SetResult(interp, Jim_MakeGlobalNamespaceName(interp, Jim_NewStringObj(interp, buf, -1)));
return JIM_OK;
}
int
Jim_redisInit(Jim_Interp *interp)
{
Jim_PackageProvideCheck(interp, "redis");
Jim_CreateCommand(interp, "redis", jim_redis_cmd, NULL, NULL);
return JIM_OK;
}