mirror of https://github.com/grpc/grpc.git
The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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181 lines
6.4 KiB
181 lines
6.4 KiB
/* |
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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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