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295 lines
5.8 KiB
C
295 lines
5.8 KiB
C
13 years ago
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#include "msgpack.h"
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#include "common.h"
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#include "cmd.h"
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#include "http.h"
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#include "client.h"
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#include <string.h>
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#include <hiredis/hiredis.h>
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#include <hiredis/async.h>
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#include <jansson.h> /* TODO: remove once msgpack is fully integrated. */
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static json_t *
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json_wrap_redis_reply(const struct cmd *cmd, const redisReply *r);
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void
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msgpack_reply(redisAsyncContext *c, void *r, void *privdata) {
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redisReply *reply = r;
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struct cmd *cmd = privdata;
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json_t *j;
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char *jstr;
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(void)c;
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if(cmd == NULL) {
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/* broken connection */
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return;
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}
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if (reply == NULL) { /* broken Redis link */
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format_send_error(cmd, 503, "Service Unavailable");
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return;
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}
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/* encode redis reply as JSON */
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j = json_wrap_redis_reply(cmd, r);
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/* get JSON as string, possibly with JSONP wrapper */
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jstr = msgpack_string_output(j, cmd->jsonp);
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/* send reply */
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format_send_reply(cmd, jstr, strlen(jstr), "application/json");
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/* cleanup */
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json_decref(j);
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free(jstr);
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}
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/**
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* Parse info message and return object.
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*/
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static json_t *
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json_info_reply(const char *s) {
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const char *p = s;
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size_t sz = strlen(s);
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json_t *jroot = json_object();
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/* TODO: handle new format */
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while(p < s + sz) {
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char *key, *val, *nl, *colon;
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/* find key */
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colon = strchr(p, ':');
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if(!colon) {
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break;
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}
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key = calloc(colon - p + 1, 1);
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memcpy(key, p, colon - p);
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p = colon + 1;
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/* find value */
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nl = strchr(p, '\r');
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if(!nl) {
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free(key);
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break;
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}
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val = calloc(nl - p + 1, 1);
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memcpy(val, p, nl - p);
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p = nl + 1;
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if(*p == '\n') p++;
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/* add to object */
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json_object_set_new(jroot, key, json_string(val));
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free(key);
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free(val);
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}
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return jroot;
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}
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static json_t *
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json_hgetall_reply(const redisReply *r) {
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/* zip keys and values together in a json object */
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json_t *jroot;
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unsigned int i;
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if(r->elements % 2 != 0) {
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return NULL;
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}
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jroot = json_object();
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for(i = 0; i < r->elements; i += 2) {
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redisReply *k = r->element[i], *v = r->element[i+1];
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/* keys and values need to be strings */
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if(k->type != REDIS_REPLY_STRING || v->type != REDIS_REPLY_STRING) {
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json_decref(jroot);
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return NULL;
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}
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json_object_set_new(jroot, k->str, json_string(v->str));
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}
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return jroot;
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}
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static json_t *
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json_wrap_redis_reply(const struct cmd *cmd, const redisReply *r) {
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unsigned int i;
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json_t *jlist, *jroot = json_object(); /* that's what we return */
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/* copy verb, as jansson only takes a char* but not its length. */
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char *verb;
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if(cmd->count) {
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verb = calloc(cmd->argv_len[0]+1, 1);
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memcpy(verb, cmd->argv[0], cmd->argv_len[0]);
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} else {
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verb = strdup("");
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}
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switch(r->type) {
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case REDIS_REPLY_STATUS:
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case REDIS_REPLY_ERROR:
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jlist = json_array();
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json_array_append_new(jlist,
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r->type == REDIS_REPLY_ERROR ? json_false() : json_true());
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json_array_append_new(jlist, json_string(r->str));
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json_object_set_new(jroot, verb, jlist);
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break;
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case REDIS_REPLY_STRING:
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if(strcasecmp(verb, "INFO") == 0) {
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json_object_set_new(jroot, verb, json_info_reply(r->str));
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} else {
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json_object_set_new(jroot, verb, json_string(r->str));
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}
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break;
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case REDIS_REPLY_INTEGER:
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json_object_set_new(jroot, verb, json_integer(r->integer));
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break;
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case REDIS_REPLY_ARRAY:
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if(strcasecmp(verb, "HGETALL") == 0) {
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json_t *jobj = json_hgetall_reply(r);
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if(jobj) {
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json_object_set_new(jroot, verb, jobj);
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break;
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}
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}
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jlist = json_array();
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for(i = 0; i < r->elements; ++i) {
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redisReply *e = r->element[i];
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switch(e->type) {
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case REDIS_REPLY_STRING:
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json_array_append_new(jlist, json_string(e->str));
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break;
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case REDIS_REPLY_INTEGER:
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json_array_append_new(jlist, json_integer(e->integer));
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break;
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default:
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json_array_append_new(jlist, json_null());
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break;
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}
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}
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json_object_set_new(jroot, verb, jlist);
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break;
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default:
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json_object_set_new(jroot, verb, json_null());
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break;
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}
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free(verb);
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return jroot;
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}
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char *
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msgpack_string_output(json_t *j, const char *jsonp) {
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char *json_reply = json_dumps(j, JSON_COMPACT);
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/* check for JSONP */
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if(jsonp) {
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size_t jsonp_len = strlen(jsonp);
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size_t json_len = strlen(json_reply);
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size_t ret_len = jsonp_len + 1 + json_len + 3;
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char *ret = calloc(1 + ret_len, 1);
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memcpy(ret, jsonp, jsonp_len);
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ret[jsonp_len]='(';
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memcpy(ret + jsonp_len + 1, json_reply, json_len);
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memcpy(ret + jsonp_len + 1 + json_len, ");\n", 3);
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free(json_reply);
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return ret;
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}
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return json_reply;
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}
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/* extract JSON from WebSocket frame and fill struct cmd. */
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struct cmd *
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msgpack_ws_extract(struct http_client *c, const char *p, size_t sz) {
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struct cmd *cmd = NULL;
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json_t *j;
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char *jsonz; /* null-terminated */
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unsigned int i, cur;
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int argc = 0;
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json_error_t jerror;
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(void)c;
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jsonz = calloc(sz + 1, 1);
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memcpy(jsonz, p, sz);
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j = json_loads(jsonz, sz, &jerror);
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free(jsonz);
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if(!j) {
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return NULL;
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}
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if(json_typeof(j) != JSON_ARRAY) {
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json_decref(j);
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return NULL; /* invalid JSON */
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}
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/* count elements */
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for(i = 0; i < json_array_size(j); ++i) {
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json_t *jelem = json_array_get(j, i);
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switch(json_typeof(jelem)) {
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case JSON_STRING:
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case JSON_INTEGER:
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argc++;
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break;
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default:
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break;
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}
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}
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if(!argc) { /* not a single item could be decoded */
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json_decref(j);
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return NULL;
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}
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/* create command and add args */
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cmd = cmd_new(argc);
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for(i = 0, cur = 0; i < json_array_size(j); ++i) {
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json_t *jelem = json_array_get(j, i);
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char *tmp;
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switch(json_typeof(jelem)) {
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case JSON_STRING:
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tmp = strdup(json_string_value(jelem));
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cmd->argv[cur] = tmp;
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cmd->argv_len[cur] = strlen(tmp);
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cur++;
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break;
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case JSON_INTEGER:
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tmp = malloc(40);
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sprintf(tmp, "%d", (int)json_integer_value(jelem));
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cmd->argv[cur] = tmp;
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cmd->argv_len[cur] = strlen(tmp);
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cur++;
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break;
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default:
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break;
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}
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}
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json_decref(j);
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return cmd;
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}
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