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Copy pathtap.go
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89 lines (79 loc) · 2.06 KB
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package testutil
import (
"fmt"
"strings"
"time"
)
// TapEvent represents a tap event
type TapEvent struct {
Method string
Authority string
Path string
HTTPStatus string
GrpcStatus string
TLS string
LineCount int
}
// Tap executes a tap command and converts the command's streaming output into tap
// events using each line's "id" field
func Tap(target string, h *TestHelper, arg ...string) ([]*TapEvent, error) {
cmd := append([]string{"viz", "tap", target}, arg...)
outputStream, err := h.LinkerdRunStream(cmd...)
if err != nil {
return nil, err
}
defer outputStream.Stop()
outputLines, err := outputStream.ReadUntil(10, 1*time.Minute)
if err != nil {
return nil, err
}
tapEventByID := make(map[string]*TapEvent)
for _, line := range outputLines {
fields := toFieldMap(line)
obj, ok := tapEventByID[fields["id"]]
if !ok {
obj = &TapEvent{}
tapEventByID[fields["id"]] = obj
}
obj.LineCount++
obj.TLS = fields["tls"]
switch fields["type"] {
case "req":
obj.Method = fields[":method"]
obj.Authority = fields[":authority"]
obj.Path = fields[":path"]
case "rsp":
obj.HTTPStatus = fields[":status"]
case "end":
obj.GrpcStatus = fields["grpc-status"]
}
}
output := make([]*TapEvent, 0)
for _, obj := range tapEventByID {
if obj.LineCount == 3 { // filter out incomplete events
output = append(output, obj)
}
}
return output, nil
}
func toFieldMap(line string) map[string]string {
fields := strings.Fields(line)
fieldMap := map[string]string{"type": fields[0]}
for _, field := range fields[1:] {
parts := strings.SplitN(field, "=", 2)
fieldMap[parts[0]] = parts[1]
}
return fieldMap
}
// ValidateExpected compares the received tap event with the expected tap event
func ValidateExpected(events []*TapEvent, expectedEvent TapEvent) error {
if len(events) == 0 {
return fmt.Errorf("Expected tap events, got nothing")
}
for _, event := range events {
if *event != expectedEvent {
return fmt.Errorf("Unexpected tap event [%+v]; expected=[%+v]", *event, expectedEvent)
}
}
return nil
}