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check.go
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check.go
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// Copyright 2017 Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cmd
import (
"bytes"
"context"
"fmt"
"strconv"
"strings"
"sync"
"text/tabwriter"
"time"
ot "github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
"github.com/spf13/cobra"
"golang.org/x/time/rate"
mixerpb "istio.io/api/mixer/v1"
"istio.io/istio/mixer/cmd/shared"
)
func checkCmd(rootArgs *rootArgs, printf, fatalf shared.FormatFn) *cobra.Command {
quotas := ""
cmd := &cobra.Command{
Use: "check",
Short: "Invokes Mixer's Check API to perform precondition checks and quota allocations.",
Long: "The Check method is used to perform precondition checks and quota allocations. Mixer\n" +
"expects a set of attributes as input, which it uses, along with\n" +
"its configuration, to determine which adapters to invoke and with\n" +
"which parameters in order to perform the checks and allocations.",
Args: cobra.ExactArgs(0),
Run: func(cmd *cobra.Command, args []string) {
q := make(map[string]int64)
if len(quotas) > 0 {
for _, seg := range strings.Split(quotas, ",") {
eq := strings.Index(seg, "=")
if eq < 0 {
fatalf("Quota definition %v does not include an = sign", seg)
}
if eq == 0 {
fatalf("Quota definition %v does not contain a valid name", seg)
}
name := seg[0:eq]
value := seg[eq+1:]
v, err := strconv.ParseInt(value, 10, 64)
if err != nil {
fatalf("Unable to parse quota value %v: %v", value, err)
}
q[name] = v
}
}
check(rootArgs, printf, fatalf, q)
}}
cmd.PersistentFlags().StringVarP("as, "quotas", "q", "",
"List of quotas to allocate specified as name1=amount1,name2=amount2,...")
return cmd
}
func check(rootArgs *rootArgs, printf, fatalf shared.FormatFn, quotas map[string]int64) {
var attrs *mixerpb.CompressedAttributes
var err error
if attrs, _, err = parseAttributes(rootArgs); err != nil {
fatalf("%v", err)
}
var cs *clientState
if cs, err = createAPIClient(rootArgs.mixerAddress, rootArgs.tracingOptions); err != nil {
fatalf("Unable to establish connection to %s: %v", rootArgs.mixerAddress, err)
}
defer deleteAPIClient(cs)
salt := time.Now().Nanosecond()
span, ctx := ot.StartSpanFromContext(context.Background(), "mixc Check", ext.SpanKindRPCClient)
var rl *rate.Limiter
if rootArgs.rate > 0 {
rl = rate.NewLimiter(rate.Limit(rootArgs.rate), rootArgs.rate)
}
if rootArgs.concurrency < 1 {
fatalf("concurrency has to be at least 1")
}
var wg sync.WaitGroup
wg.Add(rootArgs.concurrency)
for c := 0; c < rootArgs.concurrency; c++ {
go func() {
defer wg.Done()
for i := 0; i < rootArgs.repeat; i++ {
if rl != nil {
rl.Wait(context.Background())
}
dedup := strconv.Itoa(salt + i)
request := mixerpb.CheckRequest{
Attributes: *attrs,
DeduplicationId: dedup,
}
request.Quotas = make(map[string]mixerpb.CheckRequest_QuotaParams)
for name, amount := range quotas {
request.Quotas[name] = mixerpb.CheckRequest_QuotaParams{Amount: amount, BestEffort: true}
}
response, err := cs.client.Check(ctx, &request)
if err != nil {
printf("Check RPC failed with: %s", decodeError(err))
} else if rootArgs.printResponse {
printf("Check RPC completed successfully. Check status was %s", decodeStatus(response.Precondition.Status))
printf(" Valid use count: %v, valid duration: %v", response.Precondition.ValidUseCount, response.Precondition.ValidDuration)
dumpReferencedAttributes(printf, response.Precondition.ReferencedAttributes)
dumpQuotas(printf, response.Quotas)
}
}
}()
}
wg.Wait()
span.Finish()
}
func dumpQuotas(printf shared.FormatFn, quotas map[string]mixerpb.CheckResponse_QuotaResult) {
if quotas == nil {
return
}
buf := bytes.Buffer{}
tw := tabwriter.NewWriter(&buf, 0, 0, 2, ' ', 0)
fmt.Fprint(tw, " Quota\tGranted Amount\tDuration\n")
for name, qr := range quotas {
fmt.Fprintf(tw, " %s\t%v\t%v\n", name, qr.GrantedAmount, qr.ValidDuration)
}
_ = tw.Flush()
printf("%s", buf.String())
}