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1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef SERVICES_SHELL_STANDALONE_TRACER_H_ | |
6 #define SERVICES_SHELL_STANDALONE_TRACER_H_ | |
7 | |
8 #include <stddef.h> | |
9 #include <stdio.h> | |
10 | |
11 #include <memory> | |
12 #include <string> | |
13 | |
14 #include "base/callback.h" | |
15 #include "base/macros.h" | |
16 #include "base/memory/ref_counted_memory.h" | |
17 #include "mojo/common/data_pipe_drainer.h" | |
18 #include "services/tracing/public/cpp/provider.h" | |
19 #include "services/tracing/public/interfaces/tracing.mojom.h" | |
20 | |
21 namespace shell { | |
22 | |
23 // Tracer collects tracing data from base/trace_event and from externally | |
24 // configured sources, aggregates it into a single stream, and writes it out to | |
25 // a file. It should be constructed very early in a process' lifetime before any | |
26 // initialization that may be interesting to trace has occured and be shut down | |
27 // as late as possible to capture as much initialization/shutdown code as | |
28 // possible. | |
29 class Tracer : public mojo::common::DataPipeDrainer::Client { | |
30 public: | |
31 Tracer(); | |
32 ~Tracer() override; | |
33 | |
34 // Starts tracing the current process with the given set of categories. The | |
35 // tracing results will be saved into the specified filename when | |
36 // StopAndFlushToFile() is called. | |
37 void Start(const std::string& categories, | |
38 const std::string& duration_seconds_str, | |
39 const std::string& filename); | |
40 | |
41 // Starts collecting data from the tracing service with the given set of | |
42 // categories. | |
43 void StartCollectingFromTracingService( | |
44 tracing::mojom::CollectorPtr coordinator); | |
45 | |
46 // Stops tracing and flushes all collected trace data to the file specified in | |
47 // Start(). Blocks until the file write is complete. May be called after the | |
48 // message loop is shut down. | |
49 void StopAndFlushToFile(); | |
50 | |
51 void ConnectToProvider(tracing::mojom::ProviderRequest request); | |
52 | |
53 private: | |
54 void StopTracingAndFlushToDisk(); | |
55 | |
56 // Called from the flush thread. When all data is collected this runs | |
57 // |done_callback| on the flush thread. | |
58 void EndTraceAndFlush(const std::string& filename, | |
59 const base::Closure& done_callback); | |
60 | |
61 // Called from the flush thread. | |
62 void WriteTraceDataCollected( | |
63 const base::Closure& done_callback, | |
64 const scoped_refptr<base::RefCountedString>& events_str, | |
65 bool has_more_events); | |
66 | |
67 // mojo::common::DataPipeDrainer::Client implementation. | |
68 void OnDataAvailable(const void* data, size_t num_bytes) override; | |
69 void OnDataComplete() override; | |
70 | |
71 // Emits a comma if needed. | |
72 void WriteCommaIfNeeded(); | |
73 | |
74 // Writes trace file footer and closes out the file. | |
75 void WriteFooterAndClose(); | |
76 | |
77 // Set when connected to the tracing service. | |
78 tracing::mojom::CollectorPtr coordinator_; | |
79 std::unique_ptr<mojo::common::DataPipeDrainer> drainer_; | |
80 | |
81 tracing::Provider provider_; | |
82 // Whether we're currently tracing. | |
83 bool tracing_; | |
84 // Categories to trace. | |
85 std::string categories_; | |
86 | |
87 // Whether we've written the first chunk. | |
88 bool first_chunk_written_; | |
89 std::string trace_service_data_; | |
90 | |
91 // Trace file, if open. | |
92 FILE* trace_file_; | |
93 std::string trace_filename_; | |
94 | |
95 DISALLOW_COPY_AND_ASSIGN(Tracer); | |
96 }; | |
97 | |
98 } // namespace shell | |
99 | |
100 #endif // SERVICES_SHELL_STANDALONE_TRACER_H_ | |
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