update

Signed-off-by: hongming <talonwan@yunify.com>

vendor/github.com/open-policy-agent/opa/topdown/instrumentation.go

@@ -0,0 +1,59 @@
+// Copyright 2018 The OPA Authors.  All rights reserved.
+// Use of this source code is governed by an Apache2
+// license that can be found in the LICENSE file.
+
+package topdown
+
+import "github.com/open-policy-agent/opa/metrics"
+
+const (
+	evalOpPlug                  = "eval_op_plug"
+	evalOpResolve               = "eval_op_resolve"
+	evalOpRuleIndex             = "eval_op_rule_index"
+	evalOpBuiltinCall           = "eval_op_builtin_call"
+	evalOpVirtualCacheHit       = "eval_op_virtual_cache_hit"
+	evalOpVirtualCacheMiss      = "eval_op_virtual_cache_miss"
+	evalOpBaseCacheHit          = "eval_op_base_cache_hit"
+	evalOpBaseCacheMiss         = "eval_op_base_cache_miss"
+	partialOpSaveUnify          = "partial_op_save_unify"
+	partialOpSaveSetContains    = "partial_op_save_set_contains"
+	partialOpSaveSetContainsRec = "partial_op_save_set_contains_rec"
+	partialOpCopyPropagation    = "partial_op_copy_propagation"
+)
+
+// Instrumentation implements helper functions to instrument query evaluation
+// to diagnose performance issues. Instrumentation may be expensive in some
+// cases, so it is disabled by default.
+type Instrumentation struct {
+	m metrics.Metrics
+}
+
+// NewInstrumentation returns a new Instrumentation object. Performance
+// diagnostics recorded on this Instrumentation object will stored in m.
+func NewInstrumentation(m metrics.Metrics) *Instrumentation {
+	return &Instrumentation{
+		m: m,
+	}
+}
+
+func (instr *Instrumentation) startTimer(name string) {
+	if instr == nil {
+		return
+	}
+	instr.m.Timer(name).Start()
+}
+
+func (instr *Instrumentation) stopTimer(name string) {
+	if instr == nil {
+		return
+	}
+	delta := instr.m.Timer(name).Stop()
+	instr.m.Histogram(name).Update(delta)
+}
+
+func (instr *Instrumentation) counterIncr(name string) {
+	if instr == nil {
+		return
+	}
+	instr.m.Counter(name).Incr()
+}