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231 lines
4.4 KiB
C
231 lines
4.4 KiB
C
#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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struct msg_out {
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char *p;
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size_t sz;
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};
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static void
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msgpack_wrap_redis_reply(const struct cmd *cmd, struct msg_out *, 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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struct msg_out out;
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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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/* prepare data structure for output */
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out.p = NULL;
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out.sz = 0;
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/* encode redis reply */
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msgpack_wrap_redis_reply(cmd, &out, r);
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/* send reply */
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format_send_reply(cmd, out.p, out.sz, "application/x-msgpack");
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/* cleanup */
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free(out.p);
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}
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static int
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on_msgpack_write(void *data, const char *s, unsigned int sz) {
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struct msg_out *out = data;
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out->p = realloc(out->p, out->sz + sz);
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memcpy(out->p + out->sz, s, sz);
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out->sz += sz;
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return sz;
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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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void
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msg_info_reply(msgpack_packer* pk, const char *s, size_t sz) {
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const char *p = s;
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unsigned int count = 0;
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/* TODO: handle new format */
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/* count number of lines */
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while(p < s + sz) {
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p = strchr(p, '\r');
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if(!p) break;
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p++;
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count++;
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}
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/* create msgpack object */
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msgpack_pack_map(pk, count);
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p = s;
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while(p < s + sz) {
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char *key, *val, *nl, *colon;
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size_t key_sz, val_sz;
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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_sz = colon - p;
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key = calloc(key_sz + 1, 1);
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memcpy(key, p, key_sz);
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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_sz = nl - p;
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val = calloc(val_sz + 1, 1);
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memcpy(val, p, val_sz);
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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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msgpack_pack_raw(pk, key_sz);
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msgpack_pack_raw_body(pk, key, key_sz);
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msgpack_pack_raw(pk, val_sz);
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msgpack_pack_raw_body(pk, val, val_sz);
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free(key);
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free(val);
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}
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}
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static void
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msg_hgetall_reply(msgpack_packer* pk, const redisReply *r) {
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/* zip keys and values together in a msgpack object */
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unsigned int i;
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if(r->elements % 2 != 0) {
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return;
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}
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msgpack_pack_map(pk, r->elements / 2);
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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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return;
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}
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/* key */
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msgpack_pack_raw(pk, k->len);
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msgpack_pack_raw_body(pk, k->str, k->len);
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/* value */
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msgpack_pack_raw(pk, v->len);
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msgpack_pack_raw_body(pk, v->str, v->len);
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}
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}
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static void
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msgpack_wrap_redis_reply(const struct cmd *cmd, struct msg_out *out, const redisReply *r) {
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unsigned int i;
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msgpack_packer* pk = msgpack_packer_new(out, on_msgpack_write);
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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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size_t verb_sz = 0;
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if(cmd->count) {
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verb = calloc(cmd->argv_len[0]+1, 1);
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verb_sz = cmd->argv_len[0];
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memcpy(verb, cmd->argv[0], verb_sz);
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} else {
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verb = strdup("");
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}
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msgpack_pack_map(pk, 1);
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msgpack_pack_raw(pk, verb_sz);
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msgpack_pack_raw_body(pk, verb, verb_sz);
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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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msgpack_pack_array(pk, 2);
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if(r->type == REDIS_REPLY_ERROR)
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msgpack_pack_false(pk);
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else
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msgpack_pack_true(pk);
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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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msg_info_reply(pk, r->str, r->len);
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} else {
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msgpack_pack_raw(pk, r->len);
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msgpack_pack_raw_body(pk, r->str, r->len);
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}
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break;
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case REDIS_REPLY_INTEGER:
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msgpack_pack_int64(pk, 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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msg_hgetall_reply(pk, r);
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break;
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}
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msgpack_pack_array(pk, r->elements);
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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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msgpack_pack_raw(pk, e->len);
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msgpack_pack_raw_body(pk, e->str, e->len);
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break;
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case REDIS_REPLY_INTEGER:
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msgpack_pack_int64(pk, e->integer);
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break;
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default:
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msgpack_pack_nil(pk);
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break;
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}
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}
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break;
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default:
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msgpack_pack_nil(pk);
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break;
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}
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free(verb);
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msgpack_packer_free(pk);
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}
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