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+/*
+ *
+ * Copyright 2017, Google Inc.
+ * 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 Google Inc. 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 <string>
+
+#include <google/protobuf/util/json_util.h>
+#include <grpc++/grpc++.h>
+#include <grpc/support/log.h>
+
+#include "gflags/gflags.h"
+#include "mongoose.h"
+
+// TODO (makdharma): remove local copies of these protos
+#include "tools/grpcz/census.grpc.pb.h"
+#include "tools/grpcz/monitoring.grpc.pb.h"
+
+DEFINE_string(
+ grpcz_server, "127.0.0.1:8080",
+ "Unix domain socket path (e.g. unix://tmp/grpcz.sock) or IP address"
+ "(host:port) where grpcz server is running.");
+DEFINE_string(http_port, "8000",
+ "Port id for accessing the HTTP server that renders /grpcz page");
+DEFINE_bool(print_to_console, false,
+ "print the JSON retreived from grpcz server and quit");
+
+using grpc::Channel;
+using grpc::ClientContext;
+using grpc::Status;
+
+using ::grpc::instrumentation::v1alpha::CanonicalRpcStats;
+using ::grpc::instrumentation::v1alpha::Monitoring;
+
+static const std::string static_html_header =
+ "<!DOCTYPE html> <html> <head> <style> \
+table { border-collapse: collapse; width: 100%; } \
+table, td, th { border: 1px solid black; } \
+</style> </head> <body>\
+<div id='stats' data-stats='";
+
+static const std::string static_html_footer =
+ "' class='hidden'></div>\
+<h1>GRPCZ Statistics</h1> <div id='table'> </div> \
+<script> \
+ var canonical_stats = JSON.parse(\
+ document.getElementById('stats').getAttribute('data-stats')); \
+ var table = document.createElement('table'); \
+ if (canonical_stats['Error Message'] != undefined) { \
+ document.getElementById('table').innerHTML = canonical_stats['Error Message']; } \
+ else {\
+ for (var key in canonical_stats) { \
+ name = canonical_stats[key]['view']['viewName']; \
+ distribution = canonical_stats[key]['view']['distributionView']; \
+ interval = canonical_stats[key]['view']['intervalView']; \
+ value = (interval == undefined) ? \
+ JSON.stringify(distribution, null, ' ') : \
+ JSON.stringify(interval, null, ' '); \
+ var row = table.insertRow(-1); \
+ var col1 = row.insertCell(0); \
+ var col2 = row.insertCell(1); \
+ col1.innerHTML = name; \
+ col2.innerHTML = '<pre>' + value + '</pre>'; \
+ } \
+ document.getElementById('table').appendChild(table); \
+ }\
+</script> </body> </html>";
+
+class GrpczClient {
+ public:
+ GrpczClient(std::shared_ptr<Channel> channel)
+ : stub_(Monitoring::NewStub(channel)) {}
+
+ std::string GetStatsAsJson() {
+ const ::google::protobuf::Empty request;
+ CanonicalRpcStats reply;
+ ClientContext context;
+ Status status = stub_->GetCanonicalRpcStats(&context, request, &reply);
+
+ if (status.ok()) {
+ std::string json_str;
+ ::google::protobuf::util::MessageToJsonString(reply, &json_str);
+ return json_str;
+ } else {
+ static const std::string error_message_json =
+ "{\"Error Message\":\"" + status.error_message() + "\"}";
+ gpr_log(GPR_DEBUG, "%d: %s", status.error_code(),
+ status.error_message().c_str());
+ return error_message_json;
+ }
+ }
+
+ private:
+ std::unique_ptr<Monitoring::Stub> stub_;
+};
+
+static struct mg_serve_http_opts s_http_server_opts;
+std::unique_ptr<GrpczClient> g_grpcz_client;
+
+static void ev_handler(struct mg_connection *nc, int ev, void *p) {
+ if (ev == MG_EV_HTTP_REQUEST) {
+ mg_serve_http(nc, (struct http_message *)p, s_http_server_opts);
+ }
+}
+
+static void grpcz_handler(struct mg_connection *nc, int ev, void *ev_data) {
+ (void)ev;
+ (void)ev_data;
+ gpr_log(GPR_INFO, "fetching grpcz stats from %s", FLAGS_grpcz_server.c_str());
+ std::string json_str = g_grpcz_client->GetStatsAsJson();
+ std::string rendered_html =
+ static_html_header + json_str + static_html_footer;
+ mg_printf(nc, "HTTP/1.0 200 OK\r\n\r\n%s", rendered_html.c_str());
+ nc->flags |= MG_F_SEND_AND_CLOSE;
+}
+
+int main(int argc, char **argv) {
+ gflags::ParseCommandLineFlags(&argc, &argv, true);
+
+ // Create a client
+ g_grpcz_client.reset(new GrpczClient(grpc::CreateChannel(
+ FLAGS_grpcz_server, grpc::InsecureChannelCredentials())));
+ if (FLAGS_print_to_console) {
+ // using GPR_ERROR since this is the default verbosity. _DEBUG or _INFO
+ // won't print unless GRPC_VERBOSITY env var is set appropriately, which
+ // might confuse users of this utility.
+ gpr_log(GPR_ERROR, "%s\n", g_grpcz_client->GetStatsAsJson().c_str());
+ return 0;
+ }
+
+ // Set up a mongoose webserver handler
+ struct mg_mgr mgr;
+ mg_mgr_init(&mgr, NULL);
+ gpr_log(GPR_INFO, "Starting grpcz web server on port %s\n",
+ FLAGS_http_port.c_str());
+
+ struct mg_connection *nc = mg_bind(&mgr, FLAGS_http_port.c_str(), ev_handler);
+ if (nc == NULL) {
+ gpr_log(GPR_ERROR, "Failed to create listener on port %s\n",
+ FLAGS_http_port.c_str());
+ return -1;
+ }
+ mg_register_http_endpoint(nc, "/grpcz", grpcz_handler);
+ mg_set_protocol_http_websocket(nc);
+
+ // Poll in a loop and serve /grpcz pages
+ for (;;) {
+ static const int k_sleep_millis = 100;
+ mg_mgr_poll(&mgr, k_sleep_millis);
+ }
+ mg_mgr_free(&mgr);
+ return 0;
+}