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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 /metrics/healthcheck.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 'metrics/healthcheck.go')
-rw-r--r-- | metrics/healthcheck.go | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/metrics/healthcheck.go b/metrics/healthcheck.go new file mode 100644 index 000000000..f1ae31e34 --- /dev/null +++ b/metrics/healthcheck.go @@ -0,0 +1,61 @@ +package metrics + +// Healthchecks hold an error value describing an arbitrary up/down status. +type Healthcheck interface { + Check() + Error() error + Healthy() + Unhealthy(error) +} + +// NewHealthcheck constructs a new Healthcheck which will use the given +// function to update its status. +func NewHealthcheck(f func(Healthcheck)) Healthcheck { + if !Enabled { + return NilHealthcheck{} + } + return &StandardHealthcheck{nil, f} +} + +// NilHealthcheck is a no-op. +type NilHealthcheck struct{} + +// Check is a no-op. +func (NilHealthcheck) Check() {} + +// Error is a no-op. +func (NilHealthcheck) Error() error { return nil } + +// Healthy is a no-op. +func (NilHealthcheck) Healthy() {} + +// Unhealthy is a no-op. +func (NilHealthcheck) Unhealthy(error) {} + +// StandardHealthcheck is the standard implementation of a Healthcheck and +// stores the status and a function to call to update the status. +type StandardHealthcheck struct { + err error + f func(Healthcheck) +} + +// Check runs the healthcheck function to update the healthcheck's status. +func (h *StandardHealthcheck) Check() { + h.f(h) +} + +// Error returns the healthcheck's status, which will be nil if it is healthy. +func (h *StandardHealthcheck) Error() error { + return h.err +} + +// Healthy marks the healthcheck as healthy. +func (h *StandardHealthcheck) Healthy() { + h.err = nil +} + +// Unhealthy marks the healthcheck as unhealthy. The error is stored and +// may be retrieved by the Error method. +func (h *StandardHealthcheck) Unhealthy(err error) { + h.err = err +} |