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/*-
* BSD LICENSE
*
* Copyright (c) Intel Corporation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "spdk/util.h"
#include "jsonrpc_internal.h"
static int
capture_version(const struct spdk_json_val *val, void *out)
{
const struct spdk_json_val **vptr = out;
if (spdk_json_strequal(val, "2.0") != true) {
return SPDK_JSON_PARSE_INVALID;
}
*vptr = val;
return 0;
}
static int
capture_id(const struct spdk_json_val *val, void *out)
{
const struct spdk_json_val **vptr = out;
if (val->type != SPDK_JSON_VAL_STRING && val->type != SPDK_JSON_VAL_NUMBER) {
return -EINVAL;
}
*vptr = val;
return 0;
}
static int
capture_any(const struct spdk_json_val *val, void *out)
{
const struct spdk_json_val **vptr = out;
*vptr = val;
return 0;
}
static const struct spdk_json_object_decoder jsonrpc_response_decoders[] = {
{"jsonrpc", offsetof(struct spdk_jsonrpc_client_response, version), capture_version},
{"id", offsetof(struct spdk_jsonrpc_client_response, id), capture_id, true},
{"result", offsetof(struct spdk_jsonrpc_client_response, result), capture_any, true},
{"error", offsetof(struct spdk_jsonrpc_client_response, error), capture_any, true},
};
int
jsonrpc_parse_response(struct spdk_jsonrpc_client *client)
{
struct spdk_jsonrpc_client_response_internal *r;
ssize_t rc;
size_t buf_len;
size_t values_cnt;
void *end = NULL;
/* Check to see if we have received a full JSON value. */
rc = spdk_json_parse(client->recv_buf, client->recv_offset, NULL, 0, &end, 0);
if (rc == SPDK_JSON_PARSE_INCOMPLETE) {
return 0;
}
SPDK_DEBUGLOG(SPDK_LOG_RPC_CLIENT, "JSON string is :\n%s\n", client->recv_buf);
if (rc < 0 || rc > SPDK_JSONRPC_CLIENT_MAX_VALUES) {
SPDK_ERRLOG("JSON parse error (rc: %zd)\n", rc);
/*
* Can't recover from parse error (no guaranteed resync point in streaming JSON).
* Return an error to indicate that the connection should be closed.
*/
return -EINVAL;
}
values_cnt = rc;
r = calloc(1, sizeof(*r) + sizeof(struct spdk_json_val) * (values_cnt + 1));
if (!r) {
return -errno;
}
if (client->resp) {
free(r);
return -ENOSPC;
}
client->resp = r;
r->buf = client->recv_buf;
buf_len = client->recv_offset;
r->values_cnt = values_cnt;
client->recv_buf_size = 0;
client->recv_offset = 0;
client->recv_buf = NULL;
/* Decode a second time now that there is a full JSON value available. */
rc = spdk_json_parse(r->buf, buf_len, r->values, values_cnt, &end,
SPDK_JSON_PARSE_FLAG_DECODE_IN_PLACE);
if (rc != (ssize_t)values_cnt) {
SPDK_ERRLOG("JSON parse error on second pass (rc: %zd, expected: %zu)\n", rc, values_cnt);
goto err;
}
assert(end != NULL);
if (r->values[0].type != SPDK_JSON_VAL_OBJECT_BEGIN) {
SPDK_ERRLOG("top-level JSON value was not object\n");
goto err;
}
if (spdk_json_decode_object(r->values, jsonrpc_response_decoders,
SPDK_COUNTOF(jsonrpc_response_decoders), &r->jsonrpc)) {
goto err;
}
r->ready = 1;
return 1;
err:
client->resp = NULL;
spdk_jsonrpc_client_free_response(&r->jsonrpc);
return -EINVAL;
}
static int
jsonrpc_client_write_cb(void *cb_ctx, const void *data, size_t size)
{
struct spdk_jsonrpc_client_request *request = cb_ctx;
size_t new_size = request->send_buf_size;
while (new_size - request->send_len < size) {
if (new_size >= SPDK_JSONRPC_SEND_BUF_SIZE_MAX) {
SPDK_ERRLOG("Send buf exceeded maximum size (%zu)\n",
(size_t)SPDK_JSONRPC_SEND_BUF_SIZE_MAX);
return -ENOSPC;
}
new_size *= 2;
}
if (new_size != request->send_buf_size) {
uint8_t *new_buf;
new_buf = realloc(request->send_buf, new_size);
if (new_buf == NULL) {
SPDK_ERRLOG("Resizing send_buf failed (current size %zu, new size %zu)\n",
request->send_buf_size, new_size);
return -ENOMEM;
}
request->send_buf = new_buf;
request->send_buf_size = new_size;
}
memcpy(request->send_buf + request->send_len, data, size);
request->send_len += size;
return 0;
}
struct spdk_json_write_ctx *
spdk_jsonrpc_begin_request(struct spdk_jsonrpc_client_request *request, int32_t id,
const char *method)
{
struct spdk_json_write_ctx *w;
w = spdk_json_write_begin(jsonrpc_client_write_cb, request, 0);
if (w == NULL) {
return NULL;
}
spdk_json_write_object_begin(w);
spdk_json_write_named_string(w, "jsonrpc", "2.0");
if (id >= 0) {
spdk_json_write_named_int32(w, "id", id);
}
if (method) {
spdk_json_write_named_string(w, "method", method);
}
return w;
}
void
spdk_jsonrpc_end_request(struct spdk_jsonrpc_client_request *request, struct spdk_json_write_ctx *w)
{
assert(w != NULL);
spdk_json_write_object_end(w);
spdk_json_write_end(w);
jsonrpc_client_write_cb(request, "\n", 1);
}
SPDK_LOG_REGISTER_COMPONENT("rpc_client", SPDK_LOG_RPC_CLIENT)
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