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Diffstat (limited to 'tools/grpcz/grpcz_client.cc')
-rw-r--r-- | tools/grpcz/grpcz_client.cc | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/tools/grpcz/grpcz_client.cc b/tools/grpcz/grpcz_client.cc new file mode 100644 index 0000000000..47eec8dfc3 --- /dev/null +++ b/tools/grpcz/grpcz_client.cc @@ -0,0 +1,181 @@ +/* + * + * 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; +} |