1 //
2 //
3 // Copyright 2017 gRPC authors.
4 //
5 // Licensed under the Apache License, Version 2.0 (the "License");
6 // you may not use this file except in compliance with the License.
7 // You may obtain a copy of the License at
8 //
9 // http://www.apache.org/licenses/LICENSE-2.0
10 //
11 // Unless required by applicable law or agreed to in writing, software
12 // distributed under the License is distributed on an "AS IS" BASIS,
13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 // See the License for the specific language governing permissions and
15 // limitations under the License.
16 //
17 //
18
19 #include <grpc/support/port_platform.h>
20
21 #include "src/core/lib/debug/stats.h"
22
23 #include <stddef.h>
24
25 #include <algorithm>
26 #include <vector>
27
28 #include "absl/strings/str_cat.h"
29 #include "absl/strings/str_join.h"
30
31 namespace grpc_core {
32
33 namespace stats_detail {
34
35 namespace {
36 template <typename I>
ArrayToJson(absl::Span<const I> values)37 std::string ArrayToJson(absl::Span<const I> values) {
38 std::vector<std::string> parts;
39 for (auto value : values) {
40 parts.push_back(absl::StrCat(value));
41 }
42 return absl::StrCat("[", absl::StrJoin(parts, ","), "]");
43 }
44 } // namespace
45
StatsAsJson(absl::Span<const uint64_t> counters,absl::Span<const absl::string_view> counter_name,absl::Span<const HistogramView> histograms,absl::Span<const absl::string_view> histogram_name)46 std::string StatsAsJson(absl::Span<const uint64_t> counters,
47 absl::Span<const absl::string_view> counter_name,
48 absl::Span<const HistogramView> histograms,
49 absl::Span<const absl::string_view> histogram_name) {
50 std::vector<std::string> parts;
51 for (size_t i = 0; i < counters.size(); i++) {
52 parts.push_back(absl::StrCat("\"", counter_name[i], "\": ", counters[i]));
53 }
54 for (size_t i = 0; i < histograms.size(); i++) {
55 parts.push_back(
56 absl::StrCat("\"", histogram_name[i], "\": ",
57 ArrayToJson(absl::Span<const uint64_t>(
58 histograms[i].buckets, histograms[i].num_buckets))));
59 parts.push_back(absl::StrCat(
60 "\"", histogram_name[i], "_bkt\": ",
61 ArrayToJson(absl::Span<const int>(histograms[i].bucket_boundaries,
62 histograms[i].num_buckets))));
63 }
64 return absl::StrCat("{", absl::StrJoin(parts, ", "), "}");
65 }
66
67 } // namespace stats_detail
68 } // namespace grpc_core
69