1 files changed, 361 insertions, 0 deletions
diff --git a/src/spdk/lib/jsonrpc/jsonrpc_server.c b/src/spdk/lib/jsonrpc/jsonrpc_server.c
new file mode 100644
index 000000000..774612b25
--- /dev/null
+++ b/src/spdk/lib/jsonrpc/jsonrpc_server.c
@@ -0,0 +1,361 @@
+/*-
+ *   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 "jsonrpc_internal.h"
+
+#include "spdk/util.h"
+
+struct jsonrpc_request {
+	const struct spdk_json_val *version;
+	const struct spdk_json_val *method;
+	const struct spdk_json_val *params;
+	const struct spdk_json_val *id;
+};
+
+static int
+capture_val(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_request_decoders[] = {
+	{"jsonrpc", offsetof(struct jsonrpc_request, version), capture_val, true},
+	{"method", offsetof(struct jsonrpc_request, method), capture_val},
+	{"params", offsetof(struct jsonrpc_request, params), capture_val, true},
+	{"id", offsetof(struct jsonrpc_request, id), capture_val, true},
+};
+
+static void
+parse_single_request(struct spdk_jsonrpc_request *request, struct spdk_json_val *values)
+{
+	struct jsonrpc_request req = {};
+	const struct spdk_json_val *params = NULL;
+
+	if (spdk_json_decode_object(values, jsonrpc_request_decoders,
+				    SPDK_COUNTOF(jsonrpc_request_decoders),
+				    &req)) {
+		goto invalid;
+	}
+
+	if (req.version && (req.version->type != SPDK_JSON_VAL_STRING ||
+			    !spdk_json_strequal(req.version, "2.0"))) {
+		goto invalid;
+	}
+
+	if (!req.method || req.method->type != SPDK_JSON_VAL_STRING) {
+		goto invalid;
+	}
+
+	if (req.id) {
+		if (req.id->type == SPDK_JSON_VAL_STRING ||
+		    req.id->type == SPDK_JSON_VAL_NUMBER ||
+		    req.id->type == SPDK_JSON_VAL_NULL) {
+			request->id = req.id;
+		} else  {
+			goto invalid;
+		}
+	}
+
+	if (req.params) {
+		/* null json value is as if there were no parameters */
+		if (req.params->type != SPDK_JSON_VAL_NULL) {
+			if (req.params->type != SPDK_JSON_VAL_ARRAY_BEGIN &&
+			    req.params->type != SPDK_JSON_VAL_OBJECT_BEGIN) {
+				goto invalid;
+			}
+			params = req.params;
+		}
+	}
+
+	jsonrpc_server_handle_request(request, req.method, params);
+	return;
+
+invalid:
+	jsonrpc_server_handle_error(request, SPDK_JSONRPC_ERROR_INVALID_REQUEST);
+}
+
+static int
+jsonrpc_server_write_cb(void *cb_ctx, const void *data, size_t size)
+{
+	struct spdk_jsonrpc_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 -1;
+		}
+
+		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 -1;
+		}
+
+		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;
+}
+
+int
+jsonrpc_parse_request(struct spdk_jsonrpc_server_conn *conn, const void *json, size_t size)
+{
+	struct spdk_jsonrpc_request *request;
+	ssize_t rc;
+	size_t len;
+	void *end = NULL;
+
+	/* Check to see if we have received a full JSON value. It is safe to cast away const
+	 * as we don't decode in place. */
+	rc = spdk_json_parse((void *)json, size, NULL, 0, &end, 0);
+	if (rc == SPDK_JSON_PARSE_INCOMPLETE) {
+		return 0;
+	}
+
+	request = calloc(1, sizeof(*request));
+	if (request == NULL) {
+		SPDK_DEBUGLOG(SPDK_LOG_RPC, "Out of memory allocating request\n");
+		return -1;
+	}
+
+	conn->outstanding_requests++;
+
+	request->conn = conn;
+
+	len = end - json;
+	request->recv_buffer = malloc(len + 1);
+	if (request->recv_buffer == NULL) {
+		SPDK_ERRLOG("Failed to allocate buffer to copy request (%zu bytes)\n", len + 1);
+		jsonrpc_free_request(request);
+		return -1;
+	}
+
+	memcpy(request->recv_buffer, json, len);
+	request->recv_buffer[len] = '\0';
+
+	if (rc > 0 && rc <= SPDK_JSONRPC_MAX_VALUES) {
+		request->values_cnt = rc;
+		request->values = malloc(request->values_cnt * sizeof(request->values[0]));
+		if (request->values == NULL) {
+			SPDK_ERRLOG("Failed to allocate buffer for JSON values (%zu bytes)\n",
+				    request->values_cnt * sizeof(request->values[0]));
+			jsonrpc_free_request(request);
+			return -1;
+		}
+	}
+
+	request->send_offset = 0;
+	request->send_len = 0;
+	request->send_buf_size = SPDK_JSONRPC_SEND_BUF_SIZE_INIT;
+	request->send_buf = malloc(request->send_buf_size);
+	if (request->send_buf == NULL) {
+		SPDK_ERRLOG("Failed to allocate send_buf (%zu bytes)\n", request->send_buf_size);
+		jsonrpc_free_request(request);
+		return -1;
+	}
+
+	request->response = spdk_json_write_begin(jsonrpc_server_write_cb, request, 0);
+	if (request->response == NULL) {
+		SPDK_ERRLOG("Failed to allocate response JSON write context.\n");
+		jsonrpc_free_request(request);
+		return -1;
+	}
+
+	if (rc <= 0 || rc > SPDK_JSONRPC_MAX_VALUES) {
+		SPDK_DEBUGLOG(SPDK_LOG_RPC, "JSON parse error\n");
+		jsonrpc_server_handle_error(request, SPDK_JSONRPC_ERROR_PARSE_ERROR);
+
+		/*
+		 * 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 -1;
+	}
+
+	/* Decode a second time now that there is a full JSON value available. */
+	rc = spdk_json_parse(request->recv_buffer, size, request->values, request->values_cnt, &end,
+			     SPDK_JSON_PARSE_FLAG_DECODE_IN_PLACE);
+	if (rc < 0 || rc > SPDK_JSONRPC_MAX_VALUES) {
+		SPDK_DEBUGLOG(SPDK_LOG_RPC, "JSON parse error on second pass\n");
+		jsonrpc_server_handle_error(request, SPDK_JSONRPC_ERROR_PARSE_ERROR);
+		return -1;
+	}
+
+	assert(end != NULL);
+
+	if (request->values[0].type == SPDK_JSON_VAL_OBJECT_BEGIN) {
+		parse_single_request(request, request->values);
+	} else if (request->values[0].type == SPDK_JSON_VAL_ARRAY_BEGIN) {
+		SPDK_DEBUGLOG(SPDK_LOG_RPC, "Got batch array (not currently supported)\n");
+		jsonrpc_server_handle_error(request, SPDK_JSONRPC_ERROR_INVALID_REQUEST);
+	} else {
+		SPDK_DEBUGLOG(SPDK_LOG_RPC, "top-level JSON value was not array or object\n");
+		jsonrpc_server_handle_error(request, SPDK_JSONRPC_ERROR_INVALID_REQUEST);
+	}
+
+	return len;
+}
+
+struct spdk_jsonrpc_server_conn *
+spdk_jsonrpc_get_conn(struct spdk_jsonrpc_request *request)
+{
+	return request->conn;
+}
+
+/* Never return NULL */
+static struct spdk_json_write_ctx *
+begin_response(struct spdk_jsonrpc_request *request)
+{
+	struct spdk_json_write_ctx *w = request->response;
+
+	spdk_json_write_object_begin(w);
+	spdk_json_write_named_string(w, "jsonrpc", "2.0");
+
+	spdk_json_write_name(w, "id");
+	if (request->id) {
+		spdk_json_write_val(w, request->id);
+	} else {
+		spdk_json_write_null(w);
+	}
+
+	return w;
+}
+
+static void
+skip_response(struct spdk_jsonrpc_request *request)
+{
+	request->send_len = 0;
+	spdk_json_write_end(request->response);
+	request->response = NULL;
+	jsonrpc_server_send_response(request);
+}
+
+static void
+end_response(struct spdk_jsonrpc_request *request)
+{
+	spdk_json_write_object_end(request->response);
+	spdk_json_write_end(request->response);
+	request->response = NULL;
+
+	jsonrpc_server_write_cb(request, "\n", 1);
+	jsonrpc_server_send_response(request);
+}
+
+void
+jsonrpc_free_request(struct spdk_jsonrpc_request *request)
+{
+	if (!request) {
+		return;
+	}
+
+	/* We must send or skip response explicitly */
+	assert(request->response == NULL);
+
+	request->conn->outstanding_requests--;
+	free(request->recv_buffer);
+	free(request->values);
+	free(request->send_buf);
+	free(request);
+}
+
+struct spdk_json_write_ctx *
+spdk_jsonrpc_begin_result(struct spdk_jsonrpc_request *request)
+{
+	struct spdk_json_write_ctx *w = begin_response(request);
+
+	spdk_json_write_name(w, "result");
+	return w;
+}
+
+void
+spdk_jsonrpc_end_result(struct spdk_jsonrpc_request *request, struct spdk_json_write_ctx *w)
+{
+	assert(w != NULL);
+	assert(w == request->response);
+
+	/* If there was no ID in request we skip response. */
+	if (request->id && request->id->type != SPDK_JSON_VAL_NULL) {
+		end_response(request);
+	} else {
+		skip_response(request);
+	}
+}
+
+void
+spdk_jsonrpc_send_error_response(struct spdk_jsonrpc_request *request,
+				 int error_code, const char *msg)
+{
+	struct spdk_json_write_ctx *w = begin_response(request);
+
+	spdk_json_write_named_object_begin(w, "error");
+	spdk_json_write_named_int32(w, "code", error_code);
+	spdk_json_write_named_string(w, "message", msg);
+	spdk_json_write_object_end(w);
+
+	end_response(request);
+}
+
+void
+spdk_jsonrpc_send_error_response_fmt(struct spdk_jsonrpc_request *request,
+				     int error_code, const char *fmt, ...)
+{
+	struct spdk_json_write_ctx *w = begin_response(request);
+	va_list args;
+
+	spdk_json_write_named_object_begin(w, "error");
+	spdk_json_write_named_int32(w, "code", error_code);
+	va_start(args, fmt);
+	spdk_json_write_named_string_fmt_v(w, "message", fmt, args);
+	va_end(args);
+	spdk_json_write_object_end(w);
+
+	end_response(request);
+}
+
+SPDK_LOG_REGISTER_COMPONENT("rpc", SPDK_LOG_RPC)