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package main
import (
"fmt"
"log"
"os/exec"
"strings"
"github.com/hashicorp/consul/api"
"github.com/knadh/koanf/parsers/json"
"github.com/knadh/koanf/providers/consul/v2"
"github.com/knadh/koanf/providers/file"
"github.com/knadh/koanf/v2"
)
var (
kData = koanf.New(".")
kReq = koanf.New(".")
kCheck = koanf.New(".")
)
func main() {
if err := kData.Load(file.Provider("data.json"), json.Parser()); err != nil {
log.Fatalf("error loading config: %v", err)
}
cli, err := api.NewClient(api.DefaultConfig())
if err != nil {
log.Fatalf("error creating client: %v", err)
}
kv := cli.KV()
keysData := kData.Keys()
for _, key := range keysData {
newPair := &api.KVPair{Key: key, Value: []byte(kData.String(key))}
_, err = kv.Put(newPair, nil)
if err != nil {
log.Printf("Couldn't put key.")
}
}
// Single key/value.
var (
sKey string = "single_key"
sVal string = "single_val"
)
newPair := &api.KVPair{Key: sKey, Value: []byte(sVal)}
_, err = kv.Put(newPair, nil)
if err != nil {
log.Printf("Couldn't put key.")
}
provider, err := consul.Provider(consul.Config{
Key: sKey,
Recurse: false,
Detailed: false,
Cfg: api.DefaultConfig(),
})
if err != nil {
log.Fatalf("Failed to instantiate consul provider: %v", err)
}
if err := kCheck.Load(provider, nil); err != nil {
log.Fatalf("error loading config: %v", err)
}
if len(kCheck.Keys()) != 1 {
fmt.Printf("Single key: FAILED\n")
return
}
if strings.Compare(sKey, kCheck.Keys()[0]) != 0 {
fmt.Printf("Single key: key comparison FAILED\n")
return
}
if strings.Compare(sVal, kCheck.String(kCheck.Keys()[0])) != 0 {
fmt.Printf("Single key: value comparison FAILED\n")
return
}
fmt.Printf("\nSingle key test passed.\n")
kCheck.Delete("")
// first request test
// analog of the command:
// consul kv get -recurse parent
if err := kReq.Load(file.Provider("req1.json"), json.Parser()); err != nil {
log.Fatalf("error loading config: %v", err)
}
provider, err = consul.Provider(consul.Config{
Key: "parent",
Recurse: true,
Detailed: false,
Cfg: api.DefaultConfig(),
})
if err != nil {
log.Fatalf("Failed to instantiate consul provider: %v", err)
}
if err := kCheck.Load(provider, nil); err != nil {
log.Fatalf("error loading config: %v", err)
}
keysReq := kReq.Keys()
keysCheck := kCheck.Keys()
if len(keysReq) != len(keysCheck) {
fmt.Printf("First request: keys FAILED\n")
return
}
for i := 0; i < len(keysReq); i++ {
if strings.Compare(keysReq[i], keysCheck[i]) != 0 {
fmt.Printf("First request: key comparison FAILED\n")
return
}
if strings.Compare(kReq.String(keysReq[i]), kCheck.String(keysCheck[i])) != 0 {
fmt.Printf("First request: value comparison FAILED\n")
return
}
}
fmt.Printf("First request test passed.\n")
kReq.Delete("")
kCheck.Delete("")
// second request test
// analog of the command:
// consul kv get -recurse child
if err := kReq.Load(file.Provider("req2.json"), json.Parser()); err != nil {
log.Fatalf("error loading config: %v", err)
}
provider, err = consul.Provider(consul.Config{
Key: "child",
Recurse: true,
Detailed: false,
Cfg: api.DefaultConfig(),
})
if err != nil {
log.Fatalf("Failed to instantiate consul provider: %v", err)
}
if err := kCheck.Load(provider, nil); err != nil {
log.Fatalf("error loading config: %v", err)
}
keysReq = kReq.Keys()
keysCheck = kCheck.Keys()
if len(keysReq) != len(keysCheck) {
fmt.Printf("Second request: keys FAILED\n")
return
}
for i := 0; i < len(keysReq); i++ {
if strings.Compare(keysReq[i], keysCheck[i]) != 0 {
}
if strings.Compare(kReq.String(keysReq[i]), kCheck.String(keysCheck[i])) != 0 {
fmt.Printf("Second request: value comparison FAILED\n")
return
}
}
fmt.Printf("Second request test passed.\n")
kCheck.Delete("")
// adding metainformation: age (flags)
newPair = &api.KVPair{Key: "parent1", Flags: uint64(42), Value: []byte("father")}
_, err = kv.Put(newPair, nil)
if err != nil {
log.Printf("Couldn't put key with flags.")
}
// Single key detailed test.
// analog of the command:
// consul kv get -detailed parent1
sKey = "parent1"
sFlags := uint64(42)
sVal = "father"
provider, err = consul.Provider(consul.Config{
Key: sKey,
Recurse: false,
Detailed: true,
Cfg: api.DefaultConfig(),
})
if err != nil {
log.Fatalf("Failed to instantiate consul provider: %v", err)
}
if err := kCheck.Load(provider, nil); err != nil {
fmt.Printf("error loading config: %v", err)
return
}
if sFlags != uint64(kCheck.Int64("parent1.Flags")) {
fmt.Printf("Single detailed key: flags (metadata: age) comparison FAILED\n")
return
}
if strings.Compare(sVal, kCheck.String("parent1.Value")) != 0 {
fmt.Printf("Single detailed key: value comparison FAILED\n")
return
}
fmt.Printf("\nDetailed single key test passed.\n")
kCheck.Delete("")
// Detailed request (recurse) test.
// analog of the command:
// consul kv get -detailed -recurse parent
sKey = "parent"
provider, err = consul.Provider(consul.Config{
Key: sKey,
Recurse: true,
Detailed: true,
Cfg: api.DefaultConfig(),
})
if err != nil {
log.Fatalf("Failed to instantiate consul provider: %v", err)
}
if err := kCheck.Load(provider, nil); err != nil {
fmt.Printf("error loading config: %v", err)
return
}
if sFlags != uint64(kCheck.Int64("parent1.Flags")) {
fmt.Printf("Single detailed key: flags (metadata: age) comparison FAILED\n")
return
}
if strings.Compare(sVal, kCheck.String("parent1.Value")) != 0 {
fmt.Printf("Single key: value comparison FAILED\n")
return
}
sFlags = uint64(0)
sVal = "mother"
if sFlags != uint64(kCheck.Int64("parent2.Flags")) {
fmt.Printf("Single detailed key: flags (metadata: age) comparison FAILED\n")
return
}
if strings.Compare(sVal, kCheck.String("parent2.Value")) != 0 {
fmt.Printf("Single key: value comparison FAILED\n")
return
}
fmt.Printf("\nDetailed request (recurse) test passed.\n")
kCheck.Delete("")
// Watch test
sKey = "parent"
provider, err = consul.Provider(consul.Config{
Key: sKey,
Recurse: true,
Detailed: false,
Cfg: api.DefaultConfig(),
})
if err != nil {
log.Fatalf("Failed to instantiate consul provider: %v", err)
}
// Getting the old value
kCheck.Load(provider, nil)
oldVal := kCheck.String("parent1")
changedC := make(chan string, 1)
provider.Watch(func(event interface{}, err error) {
if err != nil {
fmt.Printf("Unexpected error: %v", err)
return
}
kCheck.Load(provider, nil)
// skip the first call
if strings.Compare(oldVal, kCheck.String("parent1")) != 0 {
changedC <- kCheck.String("parent1")
}
})
// changing
var newVal string = "dad"
cmd := exec.Command("consul", "kv", "put", "parent1", newVal)
err = cmd.Run()
if err != nil {
log.Fatal(err)
}
if strings.Compare(newVal, <-changedC) != 0 {
fmt.Printf("Watch failed: new value comparison FAILED\n")
return
}
fmt.Printf("Watch test passed.\n")
fmt.Printf("ALL TESTS PASSED\n")
}
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