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/
discover.go
139 lines (121 loc) · 3.18 KB
/
discover.go
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package cli
import (
"encoding/json"
"fmt"
"os"
"text/tabwriter"
"github.com/flynn/flynn/discoverd/client"
"github.com/flynn/flynn/pkg/cluster"
"github.com/flynn/go-docopt"
)
func init() {
Register("discover", runDiscover, `
usage: flynn-host discover [options] <service>...
Return low-level information about a service.
Options:
--json Pretty print response as JSON
Examples:
Show information for service 'flynn-host'.
$ flynn-host discover flynn-host
SERVICE ID ADDR
flynn-host 8d0d15d0b14d9efe6316493a658e6b3f 10.0.2.15:1113
$ flynn-host discover --json controller
[
{
"Name": "controller",
"Leader": {
"id": "0bbd29d630f63b11ae999b1dabd565f9",
"addr": "100.100.36.4:80",
"proto": "http",
"meta": {
"AUTH_KEY": "9b7b3b382f13425da3a8cb390f0937b8",
"FLYNN_APP_ID": "2169984c-c15f-499d-be77-636612425330",
"FLYNN_JOB_ID": "host-b773161b-3e50-43ec-bb38-5c492c2ba2fa",
"FLYNN_PROCESS_TYPE": "web",
"FLYNN_RELEASE_ID": "305a5c6b-7f01-4232-bc1c-74b6a408960d"
},
"index": 22
},
"Instances": [
{
"id": "0bbd29d630f63b11ae999b1dabd565f9",
"addr": "100.100.36.4:80",
"proto": "http",
"meta": {
"AUTH_KEY": "9b7b3b382f13425da3a8cb390f0937b8",
"FLYNN_APP_ID": "2169984c-c15f-499d-be77-636612425330",
"FLYNN_JOB_ID": "host-b773161b-3e50-43ec-bb38-5c492c2ba2fa",
"FLYNN_PROCESS_TYPE": "web",
"FLYNN_RELEASE_ID": "305a5c6b-7f01-4232-bc1c-74b6a408960d"
},
"index": 22
}
],
"Meta": {
"Data": {},
"index": 0
}
}
]
`)
}
type serviceInfo struct {
Name string
Leader *discoverd.Instance
Instances []*discoverd.Instance
Meta serviceMeta
}
type serviceMeta struct {
Data map[string]interface{}
Index uint64 `json:"index"`
}
func runDiscover(args *docopt.Args, c *cluster.Client) error {
services := args.All["<service>"].([]string)
if !args.Bool["--json"] {
w := tabwriter.NewWriter(os.Stdout, 1, 2, 2, ' ', 0)
defer w.Flush()
listRec(w, "SERVICE", "ID", "ADDR")
for _, service := range services {
svc := discoverd.NewService(service)
instances, _ := svc.Instances()
for _, inst := range instances {
listRec(w, service, inst.ID, inst.Addr)
}
}
return nil
}
response := make([]serviceInfo, 0, len(services))
for _, service := range services {
svc := discoverd.NewService(service)
leader, err := svc.Leader()
if err != nil {
return err
}
instances, err := svc.Instances()
if err != nil {
return err
}
meta, _ := svc.GetMeta()
data := make(map[string]interface{})
if meta.Data != nil {
if err := json.Unmarshal(meta.Data, &data); err != nil {
return err
}
}
response = append(response, serviceInfo{
Name: service,
Leader: leader,
Instances: instances,
Meta: serviceMeta{
Index: meta.Index,
Data: data,
},
})
}
data, err := json.MarshalIndent(response, "", " ")
if err != nil {
return err
}
fmt.Fprintln(os.Stdout, string(data))
return nil
}