prometheus/promql/engine_test.go

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package promql
import (
"fmt"
"testing"
"time"
"golang.org/x/net/context"
)
var noop = testStmt(func(context.Context) error {
return nil
})
func TestQueryConcurreny(t *testing.T) {
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engine := NewEngine(nil, nil)
defer engine.Stop()
block := make(chan struct{})
processing := make(chan struct{})
f := func(context.Context) error {
processing <- struct{}{}
<-block
return nil
}
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for i := 0; i < DefaultEngineOptions.MaxConcurrentQueries; i++ {
q := engine.newTestQuery(f)
go q.Exec()
select {
case <-processing:
// Expected.
case <-time.After(5 * time.Millisecond):
t.Fatalf("Query within concurrency threshold not being executed")
}
}
q := engine.newTestQuery(f)
go q.Exec()
select {
case <-processing:
t.Fatalf("Query above concurrency threhosld being executed")
case <-time.After(5 * time.Millisecond):
// Expected.
}
// Terminate a running query.
block <- struct{}{}
select {
case <-processing:
// Expected.
case <-time.After(5 * time.Millisecond):
t.Fatalf("Query within concurrency threshold not being executed")
}
// Terminate remaining queries.
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for i := 0; i < DefaultEngineOptions.MaxConcurrentQueries; i++ {
block <- struct{}{}
}
}
func TestQueryTimeout(t *testing.T) {
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engine := NewEngine(nil, &EngineOptions{
Timeout: 5 * time.Millisecond,
MaxConcurrentQueries: 20,
})
defer engine.Stop()
query := engine.newTestQuery(func(ctx context.Context) error {
time.Sleep(10 * time.Millisecond)
return contextDone(ctx, "test statement execution")
})
res := query.Exec()
if res.Err == nil {
t.Fatalf("expected timeout error but got none")
}
if _, ok := res.Err.(ErrQueryTimeout); res.Err != nil && !ok {
t.Fatalf("expected timeout error but got: %s", res.Err)
}
}
func TestQueryCancel(t *testing.T) {
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engine := NewEngine(nil, nil)
defer engine.Stop()
// Cancel a running query before it completes.
block := make(chan struct{})
processing := make(chan struct{})
query1 := engine.newTestQuery(func(ctx context.Context) error {
processing <- struct{}{}
<-block
return contextDone(ctx, "test statement execution")
})
var res *Result
go func() {
res = query1.Exec()
processing <- struct{}{}
}()
<-processing
query1.Cancel()
block <- struct{}{}
<-processing
if res.Err == nil {
t.Fatalf("expected cancellation error for query1 but got none")
}
if ee := ErrQueryCanceled("test statement execution"); res.Err != ee {
t.Fatalf("expected error %q, got %q")
}
// Canceling a query before starting it must have no effect.
query2 := engine.newTestQuery(func(ctx context.Context) error {
return contextDone(ctx, "test statement execution")
})
query2.Cancel()
res = query2.Exec()
if res.Err != nil {
t.Fatalf("unexpeceted error on executing query2: %s", res.Err)
}
}
func TestEngineShutdown(t *testing.T) {
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engine := NewEngine(nil, nil)
block := make(chan struct{})
processing := make(chan struct{})
// Shutdown engine on first handler execution. Should handler execution ever become
// concurrent this test has to be adjusted accordingly.
f := func(ctx context.Context) error {
processing <- struct{}{}
<-block
return contextDone(ctx, "test statement execution")
}
query1 := engine.newTestQuery(f)
// Stopping the engine must cancel the base context. While executing queries is
// still possible, their context is canceled from the beginning and execution should
// terminate immediately.
var res *Result
go func() {
res = query1.Exec()
processing <- struct{}{}
}()
<-processing
engine.Stop()
block <- struct{}{}
<-processing
if res.Err == nil {
t.Fatalf("expected error on shutdown during query but got none")
}
if ee := ErrQueryCanceled("test statement execution"); res.Err != ee {
t.Fatalf("expected error %q, got %q", ee, res.Err)
}
query2 := engine.newTestQuery(func(context.Context) error {
t.Fatalf("reached query execution unexpectedly")
return nil
})
// The second query is started after the engine shut down. It must
// be canceled immediately.
res2 := query2.Exec()
if res2.Err == nil {
t.Fatalf("expected error on querying shutdown engine but got none")
}
if _, ok := res2.Err.(ErrQueryCanceled); !ok {
t.Fatalf("expected cancelation error, got %q", res2.Err)
}
}
func TestRecoverEvaluatorRuntime(t *testing.T) {
var ev *evaluator
var err error
defer ev.recover(&err)
// Cause a runtime panic.
var a []int
a[123] = 1
if err.Error() != "unexpected error" {
t.Fatalf("wrong error message: %q, expected %q", err, "unexpected error")
}
}
func TestRecoverEvaluatorError(t *testing.T) {
var ev *evaluator
var err error
defer ev.recover(&err)
e := fmt.Errorf("custom error")
panic(e)
if err.Error() != e.Error() {
t.Fatalf("wrong error message: %q, expected %q", err, e)
}
}