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Merge pull request #234 from draios/token-bucket-external-time

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Allow for an external clock in token bucket.
This commit is contained in:
Mark Stemm 2017-04-25 17:40:50 -07:00 committed by GitHub
commit 76876bc3ae
2 changed files with 13 additions and 9 deletions
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12
userspace/engine/token_bucket.cpp
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@ -31,7 +31,7 @@ token_bucket::~token_bucket()
{
}
void token_bucket::init(uint32_t rate, uint32_t max_tokens)
void token_bucket::init(double rate, double max_tokens)
{
m_rate = rate;
m_max_tokens = max_tokens;
@ -39,12 +39,16 @@ void token_bucket::init(uint32_t rate, uint32_t max_tokens)
m_last_seen = sinsp_utils::get_current_time_ns();
}
bool token_bucket::claim()
bool token_bucket::claim(uint64_t now)
{
// Determine the number of tokens gained. Delta between
// last_seen and now, divided by the rate.
uint64_t now = sinsp_utils::get_current_time_ns();
uint64_t tokens_gained = (now - m_last_seen) / (m_rate * 1000000000);
if(now == 0)
{
now = sinsp_utils::get_current_time_ns();
}
double tokens_gained = (now - m_last_seen) / (m_rate * 1000000000);
m_last_seen = now;
m_tokens += tokens_gained;

10
userspace/engine/token_bucket.h
View File

@ -31,30 +31,30 @@ public:
//
// Initialize the token bucket and start accumulating tokens
//
void init(uint32_t rate, uint32_t max_tokens);
void init(double rate, double max_tokens);
//
// Returns true if a token can be claimed. Also updates
// internal metrics.
//
bool claim();
bool claim(uint64_t now = 0);
private:
//
// The number of tokens generated per second.
//
uint64_t m_rate;
double m_rate;
//
// The maximum number of tokens that can be banked for future
// claim()s.
//
uint64_t m_max_tokens;
double m_max_tokens;
//
// The current number of tokens
//
uint64_t m_tokens;
double m_tokens;
//
// The last time claim() was called (or the object was created).