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1 // SPDX-License-Identifier: GPL-3.0-or-later
2
3 #ifndef NETDATA_STREAM_CIRCULAR_BUFFER_H
4 #define NETDATA_STREAM_CIRCULAR_BUFFER_H
5
6 #include "libnetdata/libnetdata.h"
7 #include "stream-traffic-types.h"
8
9 #ifdef __cplusplus
10 extern "C" {
11 #endif
12
13 #define CBUFFER_INITIAL_SIZE (16ULL * 1024)
14 #define CBUFFER_INITIAL_MAX_SIZE (10ULL * 1024 * 1024)
15 #define HOST_THREAD_BUFFER_INITIAL_SIZE (256ULL * 1024)
16 #define REPLICATION_THREAD_BUFFER_INITIAL_SIZE (512ULL * 1024)
17
18 #define STREAM_CIRCULAR_BUFFER_ADAPT_TO_TIMES_MAX_SIZE 3
19
20 typedef struct stream_circular_buffer_stats {
21 size_t adds;
22 size_t sends;
23 size_t recreates;
24
25 size_t bytes_added;
26 size_t bytes_uncompressed;
27 size_t bytes_sent;
28
29 uint32_t bytes_size;
30 uint32_t bytes_max_size;
31 uint32_t bytes_outstanding;
32 uint32_t bytes_available;
33
34 double buffer_ratio;
35
36 size_t bytes_sent_by_type[STREAM_TRAFFIC_TYPE_MAX];
37 } STREAM_CIRCULAR_BUFFER_STATS;
38
39 struct stream_circular_buffer;
40 typedef struct stream_circular_buffer STREAM_CIRCULAR_BUFFER;
41
42 // --------------------------------------------------------------------------------------------------------------------
43 // management
44
45 STREAM_CIRCULAR_BUFFER *stream_circular_buffer_create(void);
46 void stream_circular_buffer_destroy(STREAM_CIRCULAR_BUFFER *scb);
47
48 // flushes all data in the buffer
49 void stream_circular_buffer_flush_unsafe(STREAM_CIRCULAR_BUFFER *scb, size_t buffer_max_size);
50
51 // recreates the buffer, but it does so every 5 minutes and only if the buffer has no data in it
52 // it does not alter the since_ut time of the buffer, so this is assumed to be the same session
53 // use this after deleting data from the buffer, to minimize the memory footprint of the buffer
54 void stream_circular_buffer_recreate_timed_unsafe(STREAM_CIRCULAR_BUFFER *scb, usec_t now_ut, bool force);
55
56 // returns true if it increased the buffer size
57 // if it changes the size, it updates the statistics
58 bool stream_circular_buffer_set_max_size_unsafe(STREAM_CIRCULAR_BUFFER *scb, size_t max_size, bool force);
59
60 // returns a pointer to the current circular buffer statistics
61 // copy it if you plan to use it without a lock
62 STREAM_CIRCULAR_BUFFER_STATS *stream_circular_buffer_stats_unsafe(STREAM_CIRCULAR_BUFFER *scb);
63
64 // --------------------------------------------------------------------------------------------------------------------
65 // atomic operations - no lock needed
66
67 // returns the max size of the buffer in bytes
68 size_t stream_circular_buffer_get_max_size(STREAM_CIRCULAR_BUFFER *scb);
69
70 // returns the current buffer used ratio
71 size_t stream_sender_get_buffer_used_percent(STREAM_CIRCULAR_BUFFER *scb);
72
73 // return the monotonic timestamp of the last time the buffer was created
74 usec_t stream_circular_buffer_last_flush_ut(STREAM_CIRCULAR_BUFFER *scb);
75
76 // return the monotonic timestamp of the last time we removed data from the buffer
77 usec_t stream_circular_buffer_last_sent_ut(STREAM_CIRCULAR_BUFFER *scb);
78
79 // --------------------------------------------------------------------------------------------------------------------
80 // data operations (add, get, remove data from/to the buffer)
81
82 // adds data to the end of the circular buffer, returns false when it can't (buffer is full)
83 // it updates the statistics
84 bool stream_circular_buffer_add_unsafe(
85 STREAM_CIRCULAR_BUFFER *scb, const char *data, size_t bytes_actual, size_t bytes_uncompressed,
86 STREAM_TRAFFIC_TYPE type, bool autoscale);
87
88 // returns a pointer to the beginning of the buffer, and its size in bytes
89 size_t stream_circular_buffer_get_unsafe(STREAM_CIRCULAR_BUFFER *scb, char **chunk);
90
91 // removes data from the beginning of circular buffer
92 // it updates the statistics
93 void stream_circular_buffer_del_unsafe(STREAM_CIRCULAR_BUFFER *scb, size_t bytes, usec_t now_ut);
94
95 #ifdef __cplusplus
96 }
97 #endif
98
99 #endif //NETDATA_STREAM_CIRCULAR_BUFFER_H