1 files changed, 227 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 000000000..e3940a4d4
--- /dev/null
+++ b/src/spdk/lib/jsonrpc/jsonrpc_client.c
@@ -0,0 +1,227 @@
+/*-
+ *   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)