-
Notifications
You must be signed in to change notification settings - Fork 0
/
food_finder.cc
297 lines (222 loc) · 9.43 KB
/
food_finder.cc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
#include "include/food_finder.h"
// For metrics
opencensus::stats::MeasureInt64 RPCErrorCountMeasure() {
static const auto measure =
opencensus::stats::MeasureInt64::Register(
kRPCErrorMeasureName, "Number of RPC errors encountered.", "By");
return measure;
}
opencensus::stats::MeasureInt64 RPCCountMeasure() {
static const auto measure =
opencensus::stats::MeasureInt64::Register(
kRPCCountMeasureName, "Number of RPC calls made.", "By");
return measure;
}
opencensus::stats::MeasureDouble RPCLatencyMeasure() {
static const auto measure =
opencensus::stats::MeasureDouble::Register(
kRPCLatencyMeasureName, "Latency of RPC calls made.", "ms");
return measure;
}
opencensus::tags::TagKey MethodKey() {
static const opencensus::tags::TagKey key =
opencensus::tags::TagKey::Register("method");
return key;
}
// Call to FoodSupplier
std::tuple<bool, std::vector<std::string>> FoodFinder::GetVendors(const std::string& ingredient) {
SupplierRequest request;
request.set_ingredient(ingredient);
SupplierReply reply;
ClientContext context;
// Set timeout for server
context.set_deadline(std::chrono::system_clock::now() +
std::chrono::milliseconds(kServerTimeout));
absl::Time start = absl::Now();
Status status = stub_->GetVendors(&context, request, &reply);
// Record latency
absl::Time end = absl::Now();
double latency = absl::ToDoubleMilliseconds(end - start);
opencensus::stats::Record({{RPCLatencyMeasure(), latency}});
// Record RPC call
opencensus::stats::Record({{RPCCountMeasure(), 1}});
if (!status.ok()) {
std::cout << status.error_code() << ": " << status.error_message()
<< std::endl;
// Record error for metrics
opencensus::stats::Record({{RPCErrorCountMeasure(), 1}});
std::string custom_error_message = "FoodSupplier " + status.error_message();
std::vector<std::string> error = {custom_error_message};
return std::make_tuple(false, error);
}
std::vector<std::string> vendors = {};
for (const std::string& vendor : reply.vendors()) {
vendors.push_back(vendor);
}
return std::make_tuple(true, vendors);
}
// Call to FoodVendor
std::tuple<bool, std::string> FoodFinder::GetIngredientInfo(const std::string& ingredient,
const std::string& vendorName) {
VendorRequest request;
request.set_ingredient(ingredient);
request.set_vendor_name(vendorName);
VendorReply reply;
ClientContext context;
// Set timeout for server
context.set_deadline(std::chrono::system_clock::now() +
std::chrono::milliseconds(kServerTimeout));
absl::Time start = absl::Now();
Status status = stub_->GetIngredientInfo(&context, request, &reply);
// Record latency
absl::Time end = absl::Now();
double latency = absl::ToDoubleMilliseconds(end - start);
opencensus::stats::Record({{RPCLatencyMeasure(), latency}});
// Record RPC call
opencensus::stats::Record({{RPCCountMeasure(), 1}});
if (!status.ok()) {
std::cout << status.error_code() << ": " << status.error_message()
<< std::endl;
// Record error for metrics
opencensus::stats::Record({{RPCErrorCountMeasure(), 1}});
std::string custom_error_message = "FoodVendor " + status.error_message();
return std::make_tuple(false, custom_error_message);
}
std::string ingredient_info = FormatIngredientInfo(reply.inventory_count(), reply.price());
return std::make_tuple(true, ingredient_info);
}
std::string FoodFinder::FormatIngredientInfo(int inventory_count, float price) {
std::ostringstream oss;
oss << inventory_count << " available @ $" << price;
return oss.str();
}
Status FoodFinderService::GetVendorsInfo(ServerContext* context, const FinderRequest* request,
FinderReply* reply){
const std::string ingredient = request->ingredient();
FoodFinder supplier_finder(grpc::CreateChannel(
supplier_address_, grpc::InsecureChannelCredentials()));
FoodFinder vendor_finder(grpc::CreateChannel(
vendor_address_, grpc::InsecureChannelCredentials()));
static opencensus::trace::AlwaysSampler sampler;
// For metrics
grpc::RegisterOpenCensusPlugin();
grpc::RegisterOpenCensusViewsForExport();
RegisterExporters();
// Begin FoodFinder span
opencensus::trace::Span finder_span = opencensus::trace::Span::StartSpan(
"FoodFinder", /* parent = */ nullptr, {&sampler});
finder_span.AddAnnotation("Requested ingredient: " + ingredient);
// Begin FoodSupplier span
opencensus::trace::Span supplier_span = opencensus::trace::Span::StartSpan(
"FoodSupplier", &finder_span, {&sampler});
std::tuple<bool, std::vector<std::string>> supplier_return = supplier_finder.GetVendors(ingredient);
bool success = std::get<0>(supplier_return);
// FoodSupplier returned an error
if (!success) {
std::string error_message = std::get<1>(supplier_return).at(0);
supplier_span.AddAnnotation("ERROR: " + error_message);
supplier_span.SetStatus(opencensus::trace::StatusCode::UNKNOWN);
supplier_span.End();
finder_span.End();
return Status(StatusCode::ABORTED, error_message);
}
std::vector<std::string> vendors = std::get<1>(supplier_return);
int num_vendors = vendors.size();
if (num_vendors == 0) {
supplier_span.AddAnnotation("No vendors found");
supplier_span.End();
reply->add_vendors_info("None");
finder_span.End();
return Status::OK;
}
supplier_span.AddAnnotation(std::to_string(num_vendors) + " vendors found");
supplier_span.End();
// Begin FoodVendor span
opencensus::trace::Span vendor_span = opencensus::trace::Span::StartSpan(
"FoodVendor", &finder_span, {&sampler});
for (const std::string& vendor : vendors) {
const std::string span_name = "FoodVendor - " + vendor;
opencensus::trace::Span curr_vendor_span = opencensus::trace::Span::StartSpan(
span_name, &vendor_span, {&sampler});
std::tuple<bool, std::string> vendor_return = vendor_finder.GetIngredientInfo(ingredient, vendor);
bool success = std::get<0>(vendor_return);
if (!success) {
std::string error_message = std::get<1>(vendor_return);
curr_vendor_span.AddAnnotation("ERROR: " + error_message);
curr_vendor_span.SetStatus(opencensus::trace::StatusCode::UNKNOWN);
curr_vendor_span.End();
vendor_span.End();
finder_span.End();
return Status(StatusCode::ABORTED, error_message);
}
std::string ingredient_info = std::get<1>(vendor_return);
std::ostringstream oss;
oss << vendor << ": " << ingredient_info;
reply->add_vendors_info(oss.str());
curr_vendor_span.End();
}
vendor_span.End();
finder_span.End();
return Status::OK;
}
void FoodFinderService::RegisterExporters() {
// Zipkin
opencensus::exporters::trace::ZipkinExporterOptions options = opencensus::exporters::trace::ZipkinExporterOptions(endpoint_);
options.service_name = "FoodService";
opencensus::exporters::trace::ZipkinExporter::Register(options);
// StackDriver
const char* project_id = getenv("STACKDRIVER_PROJECT_ID");
if (project_id == nullptr) {
std::cerr << "The STACKDRIVER_PROJECT_ID environment variable is not set: "
"not exporting to Stackdriver.\n";
}
else {
opencensus::exporters::stats::StackdriverOptions stats_opts;
stats_opts.project_id = project_id;
opencensus::exporters::stats::StackdriverExporter::Register(
std::move(stats_opts));
}
}
void RegisterViews() {
RPCErrorCountMeasure();
opencensus::stats::ViewDescriptor()
.set_name("FoodService/RPCErrorCount")
.set_description("Number of RPC errors")
.set_measure(kRPCErrorMeasureName)
.set_aggregation(opencensus::stats::Aggregation::Count())
.add_column(MethodKey())
.RegisterForExport();
RPCCountMeasure();
opencensus::stats::ViewDescriptor()
.set_name("FoodService/RPCCount")
.set_description("Number of RPC calls")
.set_measure(kRPCCountMeasureName)
.set_aggregation(opencensus::stats::Aggregation::Count())
.add_column(MethodKey())
.RegisterForExport();
RPCLatencyMeasure();
opencensus::stats::ViewDescriptor()
.set_name("FoodService/RPCLatency")
.set_description("Latency of RPC calls")
.set_measure(kRPCCountMeasureName)
.set_aggregation(opencensus::stats::Aggregation::Distribution(
opencensus::stats::BucketBoundaries::Explicit(
{0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100})))
.add_column(MethodKey())
.RegisterForExport();
}
void RunFoodFinder() {
const std::string server_address = "localhost:50071";
FoodFinderService service;
RegisterViews();
ServerBuilder builder;
builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
builder.RegisterService(&service);
std::unique_ptr<Server> server(builder.BuildAndStart());
std::cout << "Server listening on " << server_address << std::endl;
server->Wait();
}
int main(int argc, char** argv) {
RunFoodFinder();
return 0;
}