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frontends.go
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frontends.go
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package main
import (
"context"
"encoding/json"
"fmt"
"net/url"
"github.com/b3scale/b3scale/pkg/bbb"
"github.com/b3scale/b3scale/pkg/http/api"
"github.com/b3scale/b3scale/pkg/store"
"github.com/urfave/cli/v2"
)
// Frontend retrieval helper
func getFrontendByKey(
ctx context.Context, c api.Client, key string,
) (*store.FrontendState, error) {
frontends, err := c.FrontendsList(ctx, url.Values{
"key": []string{key},
})
if err != nil {
return nil, err
}
if len(frontends) > 0 {
return frontends[0], nil
}
return nil, nil
}
// setFrontend manages a frontend
func (c *Cli) setFrontend(ctx *cli.Context) error {
dry := ctx.Bool("dry")
// Args should be frontend key
if ctx.NArg() < 1 {
return fmt.Errorf("require: <frontend key>")
}
key := ctx.Args().Get(0)
secret := ctx.String("secret")
fmt.Println("getting frontend:", key)
client, err := apiClient(ctx)
if err != nil {
return err
}
// Get or create frontend
state, err := getFrontendByKey(ctx.Context, client, key)
if state == nil && err == nil {
fmt.Println("creating frontend")
// Create frontend
if secret == "" {
return fmt.Errorf("secret may not be empty")
}
state = store.InitFrontendState(&store.FrontendState{
Frontend: &bbb.Frontend{
Key: key,
Secret: secret,
},
})
if ctx.IsSet("opts") {
if err := json.Unmarshal(
[]byte(ctx.String("opts")), &state.Settings); err != nil {
return err
}
}
if !dry {
state, err = client.FrontendCreate(ctx.Context, state)
if err != nil {
return err
}
fmt.Println("created frontend:", state.ID, state.Frontend.Key)
} else {
fmt.Println("skipped creating frontend")
}
}
if err != nil { // Something else failed.
return err
}
// Update Frontend
changes := false
if ctx.IsSet("secret") {
if secret == "" {
return fmt.Errorf("secret may not be empty for update")
}
changes = true
state.Frontend.Secret = secret
}
if ctx.IsSet("opts") {
changes = true
}
if !changes {
fmt.Println("no changes")
c.returnCode = RetNoChange
} else {
if !dry {
if ctx.IsSet("opts") {
// Update frontend settings using raw payload to
// convey explicit null values.
payload, err := json.Marshal(map[string]json.RawMessage{
"settings": []byte(ctx.String("opts")),
})
if err != nil {
return err
}
_, err = client.FrontendUpdateRaw(ctx.Context, state.ID, payload)
if err != nil {
return err
}
} else {
_, err := client.FrontendUpdate(ctx.Context, state)
if err != nil {
return err
}
}
fmt.Println("updated frontend")
} else {
fmt.Println("skipped saving changes in frontend")
}
}
return nil
}
// deleteFrontend removes a frontend from the cluster
func (c *Cli) deleteFrontend(ctx *cli.Context) error {
dry := ctx.Bool("dry")
// Args should be host
key := ctx.Args().Get(0)
if key == "" {
return fmt.Errorf("need frontend key for delete")
}
client, err := apiClient(ctx)
if err != nil {
return err
}
state, err := getFrontendByKey(ctx.Context, client, key)
if err != nil {
return err
}
if state == nil {
return fmt.Errorf("frontend not found")
}
if dry {
fmt.Println("skipping delete (dry)")
return nil
}
fmt.Println("delete frontend:", state.ID)
_, err = client.FrontendDelete(ctx.Context, state)
return err
}
// showFrontend displays information about a frontend
func (c *Cli) showFrontend(ctx *cli.Context) error {
key := ctx.Args().Get(0)
if key == "" {
return fmt.Errorf("need frontend key for showing info")
}
client, err := apiClient(ctx)
if err != nil {
return err
}
state, err := getFrontendByKey(ctx.Context, client, key)
if err != nil {
return err
}
fmt.Println("Frontend:", state.Frontend.Key)
fmt.Println("Settings:")
s, _ := json.MarshalIndent(state.Settings, " ", " ")
fmt.Println(string(s))
return nil
}
// show a list of all frontends
func (c *Cli) showFrontends(ctx *cli.Context) error {
client, err := apiClient(ctx)
if err != nil {
return err
}
frontends, err := client.FrontendsList(ctx.Context, nil)
if err != nil {
return err
}
for _, f := range frontends {
settings, _ := json.Marshal(f.Settings)
fmt.Printf("%s\t%s\t%s\t%s\n", f.ID, f.Frontend.Key, f.Frontend.Secret, settings)
}
return nil
}
func (c *Cli) completeFrontend(ctx *cli.Context) {
// This will complete if no args are passed
if ctx.NArg() > 0 {
return
}
client, err := apiClient(ctx)
if err != nil {
return
}
// Check if backend exists
frontends, err := client.FrontendsList(ctx.Context, nil)
if err != nil {
return
}
for _, f := range frontends {
fmt.Println(f.Frontend.Key)
}
}