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/*
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*
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* Copyright 2017, Google Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <string>
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#include <google/protobuf/util/json_util.h>
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#include <grpc++/grpc++.h>
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#include <grpc/support/log.h>
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#include "gflags/gflags.h"
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#include "mongoose.h"
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// TODO (makdharma): remove local copies of these protos
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#include "tools/grpcz/census.grpc.pb.h"
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#include "tools/grpcz/monitoring.grpc.pb.h"
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DEFINE_string(
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grpcz_server, "127.0.0.1:8080",
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"Unix domain socket path (e.g. unix://tmp/grpcz.sock) or IP address"
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"(host:port) where grpcz server is running.");
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DEFINE_string(http_port, "8000",
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"Port id for accessing the HTTP server that renders /grpcz page");
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DEFINE_bool(print_to_console, false,
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"print the JSON retreived from grpcz server and quit");
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using grpc::Channel;
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using grpc::ClientContext;
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using grpc::Status;
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using ::grpc::instrumentation::v1alpha::CanonicalRpcStats;
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using ::grpc::instrumentation::v1alpha::Monitoring;
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static const std::string static_html_header =
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"<!DOCTYPE html> <html> <head> <style> \
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table { border-collapse: collapse; width: 100%; } \
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table, td, th { border: 1px solid black; } \
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</style> </head> <body>\
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<div id='stats' data-stats='";
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static const std::string static_html_footer =
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"' class='hidden'></div>\
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<h1>GRPCZ Statistics</h1> <div id='table'> </div> \
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<script> \
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var canonical_stats = JSON.parse(\
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document.getElementById('stats').getAttribute('data-stats')); \
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var table = document.createElement('table'); \
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if (canonical_stats['Error Message'] != undefined) { \
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document.getElementById('table').innerHTML = canonical_stats['Error Message']; } \
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else {\
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for (var key in canonical_stats) { \
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name = canonical_stats[key]['view']['viewName']; \
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distribution = canonical_stats[key]['view']['distributionView']; \
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interval = canonical_stats[key]['view']['intervalView']; \
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value = (interval == undefined) ? \
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JSON.stringify(distribution, null, ' ') : \
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JSON.stringify(interval, null, ' '); \
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var row = table.insertRow(-1); \
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var col1 = row.insertCell(0); \
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var col2 = row.insertCell(1); \
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col1.innerHTML = name; \
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col2.innerHTML = '<pre>' + value + '</pre>'; \
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} \
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document.getElementById('table').appendChild(table); \
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}\
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</script> </body> </html>";
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class GrpczClient {
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public:
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GrpczClient(std::shared_ptr<Channel> channel)
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: stub_(Monitoring::NewStub(channel)) {}
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std::string GetStatsAsJson() {
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const ::google::protobuf::Empty request;
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CanonicalRpcStats reply;
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ClientContext context;
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Status status = stub_->GetCanonicalRpcStats(&context, request, &reply);
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if (status.ok()) {
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std::string json_str;
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::google::protobuf::util::MessageToJsonString(reply, &json_str);
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return json_str;
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} else {
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static const std::string error_message_json =
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"{\"Error Message\":\"" + status.error_message() + "\"}";
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gpr_log(GPR_DEBUG, "%d: %s", status.error_code(),
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status.error_message().c_str());
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return error_message_json;
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}
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}
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private:
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std::unique_ptr<Monitoring::Stub> stub_;
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};
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static struct mg_serve_http_opts s_http_server_opts;
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std::unique_ptr<GrpczClient> g_grpcz_client;
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static void ev_handler(struct mg_connection *nc, int ev, void *p) {
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if (ev == MG_EV_HTTP_REQUEST) {
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mg_serve_http(nc, (struct http_message *)p, s_http_server_opts);
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}
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}
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static void grpcz_handler(struct mg_connection *nc, int ev, void *ev_data) {
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(void)ev;
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(void)ev_data;
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gpr_log(GPR_INFO, "fetching grpcz stats from %s", FLAGS_grpcz_server.c_str());
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std::string json_str = g_grpcz_client->GetStatsAsJson();
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std::string rendered_html =
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static_html_header + json_str + static_html_footer;
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mg_printf(nc, "HTTP/1.0 200 OK\r\n\r\n%s", rendered_html.c_str());
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nc->flags |= MG_F_SEND_AND_CLOSE;
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}
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int main(int argc, char **argv) {
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gflags::ParseCommandLineFlags(&argc, &argv, true);
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// Create a client
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g_grpcz_client.reset(new GrpczClient(grpc::CreateChannel(
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FLAGS_grpcz_server, grpc::InsecureChannelCredentials())));
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if (FLAGS_print_to_console) {
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// using GPR_ERROR since this is the default verbosity. _DEBUG or _INFO
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// won't print unless GRPC_VERBOSITY env var is set appropriately, which
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// might confuse users of this utility.
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gpr_log(GPR_ERROR, "%s\n", g_grpcz_client->GetStatsAsJson().c_str());
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return 0;
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}
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// Set up a mongoose webserver handler
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struct mg_mgr mgr;
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mg_mgr_init(&mgr, NULL);
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gpr_log(GPR_INFO, "Starting grpcz web server on port %s\n",
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FLAGS_http_port.c_str());
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struct mg_connection *nc = mg_bind(&mgr, FLAGS_http_port.c_str(), ev_handler);
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if (nc == NULL) {
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gpr_log(GPR_ERROR, "Failed to create listener on port %s\n",
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FLAGS_http_port.c_str());
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return -1;
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}
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mg_register_http_endpoint(nc, "/grpcz", grpcz_handler);
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mg_set_protocol_http_websocket(nc);
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// Poll in a loop and serve /grpcz pages
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for (;;) {
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static const int k_sleep_millis = 100;
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mg_mgr_poll(&mgr, k_sleep_millis);
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}
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mg_mgr_free(&mgr);
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return 0;
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}
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