1 files changed, 213 insertions, 0 deletions
diff --git a/src/spdk/lib/jsonrpc/jsonrpc_client.c b/src/spdk/lib/jsonrpc/jsonrpc_client.c
new file mode 100644
index 00000000..2426f4e3
--- /dev/null
+++ b/src/spdk/lib/jsonrpc/jsonrpc_client.c
@@ -0,0 +1,213 @@
+/*-
+ *   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"
+
+struct jsonrpc_response {
+	const struct spdk_json_val *version;
+	const struct spdk_json_val *id;
+	const struct spdk_json_val *result;
+};
+
+static int
+capture_string(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 SPDK_JSON_PARSE_INVALID;
+	}
+
+	*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 jsonrpc_response, version), capture_string},
+	{"id", offsetof(struct jsonrpc_response, id), capture_id},
+	{"result", offsetof(struct jsonrpc_response, result), capture_any},
+};
+
+static int
+parse_single_response(struct spdk_json_val *values,
+		      spdk_jsonrpc_client_response_parser parser_fn,
+		      void *parser_ctx)
+{
+	struct jsonrpc_response resp = {};
+
+	if (spdk_json_decode_object(values, jsonrpc_response_decoders,
+				    SPDK_COUNTOF(jsonrpc_response_decoders),
+				    &resp)) {
+		return SPDK_JSON_PARSE_INVALID;
+	}
+
+	return parser_fn(parser_ctx, resp.result);
+}
+
+int
+spdk_jsonrpc_parse_response(struct spdk_jsonrpc_client *client, void *json, size_t size)
+{
+	ssize_t rc;
+	void *end = NULL;
+
+	/* Check to see if we have received a full JSON value. */
+	rc = spdk_json_parse(json, size, NULL, 0, &end, 0);
+	if (rc == SPDK_JSON_PARSE_INCOMPLETE) {
+		return rc;
+	}
+
+	SPDK_DEBUGLOG(SPDK_LOG_RPC_CLIENT, "Json string is :\n%s\n", (char *)json);
+	if (rc < 0 || rc > SPDK_JSONRPC_MAX_VALUES) {
+		SPDK_ERRLOG("JSON parse error\n");
+		/*
+		 * 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 SPDK_JSON_PARSE_INVALID;
+	}
+
+	/* Decode a second time now that there is a full JSON value available. */
+	rc = spdk_json_parse(json, size, client->values, SPDK_JSONRPC_MAX_VALUES, &end,
+			     SPDK_JSON_PARSE_FLAG_DECODE_IN_PLACE);
+	if (rc < 0 || rc > SPDK_JSONRPC_MAX_VALUES) {
+		SPDK_ERRLOG("JSON parse error on second pass\n");
+		return SPDK_JSON_PARSE_INVALID;
+	}
+
+	assert(end != NULL);
+
+	if (client->values[0].type != SPDK_JSON_VAL_OBJECT_BEGIN) {
+		SPDK_ERRLOG("top-level JSON value was not object\n");
+		return SPDK_JSON_PARSE_INVALID;
+	}
+
+	rc = parse_single_response(client->values, client->parser_fn, client->parser_ctx);
+
+	return rc;
+}
+
+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)