void db_op(struct mg_connection *nc, const struct http_message *hm,
const struct mg_str *key, void *db, int op) {
switch (op) {
case API_OP_GET: op_get(nc, hm, key, db); break;
case API_OP_SET: op_set(nc, hm, key, db); break;
case API_OP_DEL: op_del(nc, hm, key, db); break;
default:
mg_printf(nc, "%s", "HTTP/1.0 501 Not Implemented\r\n"
"Content-Length: 0\r\n\r\n");
break;
}
}
int parse_json(uint16_t json_sz) {
int ret = SUCCESS;
char *cursor = json;
char *op = NULL;
char *line_start = NULL, *line_end = NULL, *delim = NULL;
uint16_t remaining = json_sz;
uint16_t line_remaining = 0;
uint16_t consumed = 0;
// There's nothing to do; just return.
if (0 == json_sz) {
#ifdef DEBUG
fprintf(stderr, "[D] parse_json | json_sz = 0x%04x; nothing to do\n", json_sz);
#endif
goto bail;
}
// For each INSN (1 per line)...
while (NULL != (line_start = strnchr(cursor, '\n', (uint32_t)remaining))) {
#ifdef DEBUG
fprintf(stderr, "[D] parse_json | top of loop; line_start = '%s'\n", line_start);
#endif
// Consume the newline.
line_start += 1;
remaining -= 1;
// If there's nothing left, we've parse it all.
if (0 == remaining) {
#ifdef DEBUG
fprintf(stderr, "[D] parse_json | consumed all JSON\n", remaining);
#endif
goto bail;
}
// Find next newline (so we have bounds to this line).
if (NULL == (line_end = strnchr(line_start, '\n', (uint32_t)remaining))) {
#ifdef DEBUG
fprintf(stderr, "[E] parse_json | could not find next line ending; line_start is: '%s'\n", line_start);
#endif
ret = ERRNO_MALFORMED_JSON;
goto bail;
}
line_remaining = line_end - line_start;
cursor = line_start;
#ifdef DEBUG
fprintf(stderr, "[D] parse_json | cursor = line_start = '%s'\n", cursor);
#endif
// Decrement from global remaining now, since we'll be consuming this line.
remaining -= line_remaining;
////
// Get OP
////
if (NULL == (delim = strnchr(cursor, ' ', (uint32_t)(line_remaining)))) {
#ifdef DEBUG
fprintf(stderr, "[E] parse_json | cannot find OP delim\n");
#endif
ret = ERRNO_MALFORMED_JSON;
goto bail;
}
consumed = delim - cursor;
line_remaining -= consumed;
if (SZ_INSN_OP != consumed) {
#ifdef DEBUG
fprintf(stderr, "[E] parse_json | invalid OP length: %d\n", consumed);
#endif
ret = ERRNO_MALFORMED_JSON;
goto bail;
}
////
// Dispatch OP
////
op = cursor;
cursor += SZ_INSN_OP+1;
if (0 == memcmp("NEW", op, SZ_INSN_OP)) {
if (SUCCESS != (ret = op_new(&cursor, &line_remaining))) {
#ifdef DEBUG
fprintf(stderr, "[E] parse_json | NEW | non-SUCCESS from op_new()\n");
#endif
goto bail;
}
} else if (0 == memcmp("SET", op, SZ_INSN_OP)) {
if (SUCCESS != (ret = op_set(&cursor, &line_remaining))) {
#ifdef DEBUG
fprintf(stderr, "[E] parse_json | NEW | non-SUCCESS from op_set()\n");
#endif
goto bail;
}
} else if (0 == memcmp("DEL", op, SZ_INSN_OP)) {
if (SUCCESS != (ret = op_del(&cursor, &line_remaining))) {
#ifdef DEBUG
fprintf(stderr, "[E] parse_json | NEW | non-SUCCESS from op_del()\n");
#endif
goto bail;
}
} else {
#ifdef DEBUG
fprintf(stderr, "[E] parse_json | unknown OP: '%.3s'\n", cursor);
#endif
ret = ERRNO_MALFORMED_JSON;
goto bail;
}
}
bail:
return ret;
}