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author | Anton Evangelatov <anton.evangelatov@gmail.com> | 2018-02-23 17:56:08 +0800 |
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committer | Péter Szilágyi <peterke@gmail.com> | 2018-02-23 17:56:08 +0800 |
commit | ae9f97221a96a86e4343a5c3cc4b1db44627a2f3 (patch) | |
tree | 0154be72d0f2e1f032d129b9433d1bf3939cd8f0 /vendor/github.com/influxdata/influxdb/models/inline_fnv.go | |
parent | 7f74bdf8dded0e1ac3c01e043c2ed89d78f308cf (diff) | |
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metrics: pull library and introduce ResettingTimer and InfluxDB reporter (#15910)
* go-metrics: fork library and introduce ResettingTimer and InfluxDB reporter.
* vendor: change nonsense/go-metrics to ethersphere/go-metrics
* go-metrics: add tests. move ResettingTimer logic from reporter to type.
* all, metrics: pull in metrics package in go-ethereum
* metrics/test: make sure metrics are enabled for tests
* metrics: apply gosimple rules
* metrics/exp, internal/debug: init expvar endpoint when starting pprof server
* internal/debug: tiny comment formatting fix
Diffstat (limited to 'vendor/github.com/influxdata/influxdb/models/inline_fnv.go')
-rw-r--r-- | vendor/github.com/influxdata/influxdb/models/inline_fnv.go | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/vendor/github.com/influxdata/influxdb/models/inline_fnv.go b/vendor/github.com/influxdata/influxdb/models/inline_fnv.go new file mode 100644 index 000000000..eec1ae8b0 --- /dev/null +++ b/vendor/github.com/influxdata/influxdb/models/inline_fnv.go @@ -0,0 +1,32 @@ +package models // import "github.com/influxdata/influxdb/models" + +// from stdlib hash/fnv/fnv.go +const ( + prime64 = 1099511628211 + offset64 = 14695981039346656037 +) + +// InlineFNV64a is an alloc-free port of the standard library's fnv64a. +// See https://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function. +type InlineFNV64a uint64 + +// NewInlineFNV64a returns a new instance of InlineFNV64a. +func NewInlineFNV64a() InlineFNV64a { + return offset64 +} + +// Write adds data to the running hash. +func (s *InlineFNV64a) Write(data []byte) (int, error) { + hash := uint64(*s) + for _, c := range data { + hash ^= uint64(c) + hash *= prime64 + } + *s = InlineFNV64a(hash) + return len(data), nil +} + +// Sum64 returns the uint64 of the current resulting hash. +func (s *InlineFNV64a) Sum64() uint64 { + return uint64(*s) +} |