isle/go/cmd/entrypoint/hosts.go

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package main
import (
"isle/bootstrap"
"errors"
"fmt"
"os"
"regexp"
"sort"
"github.com/mediocregopher/mediocre-go-lib/v2/mlog"
"gopkg.in/yaml.v3"
)
var hostNameRegexp = regexp.MustCompile(`^[a-z][a-z0-9\-]*$`)
func validateHostName(name string) error {
if !hostNameRegexp.MatchString(name) {
return errors.New("a host's name must start with a letter and only contain letters, numbers, and dashes")
}
return nil
}
var subCmdHostsList = subCmd{
name: "list",
descr: "Lists all hosts in the network, and their IPs",
checkLock: true,
do: func(subCmdCtx subCmdCtx) error {
flags := subCmdCtx.flagSet(false)
logLevelStr := flags.StringP(
"log-level", "l", "info",
`Maximum log level which should be output. Values can be "debug", "info", "warn", "error", "fatal". Does not apply to sub-processes`,
)
if err := flags.Parse(subCmdCtx.args); err != nil {
return fmt.Errorf("parsing flags: %w", err)
}
ctx := subCmdCtx.ctx
logLevel := mlog.LevelFromString(*logLevelStr)
if logLevel == nil {
return fmt.Errorf("couldn't parse log level %q", *logLevelStr)
}
logger := subCmdCtx.logger.WithMaxLevel(logLevel.Int())
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hostBootstrap, err := loadHostBootstrap()
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if err != nil {
return fmt.Errorf("loading host bootstrap: %w", err)
}
hostsMap, err := hostBootstrap.GetGarageBootstrapHosts(ctx, logger)
if err != nil {
return fmt.Errorf("retrieving hosts from garage: %w", err)
}
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type host struct {
Name string `yaml:"name"`
Nebula struct {
IP string `yaml:"ip"`
} `yaml:"nebula"`
Garage bootstrap.GarageHost `yaml:"garage,omitempty"`
}
hosts := make([]host, 0, len(hostsMap))
for _, h := range hostsMap {
host := host{
Name: h.Name,
Garage: h.Garage,
}
host.Nebula.IP = h.IP().String()
hosts = append(hosts, host)
}
sort.Slice(hosts, func(i, j int) bool { return hosts[i].Name < hosts[j].Name })
return yaml.NewEncoder(os.Stdout).Encode(hosts)
},
}
var subCmdHostsDelete = subCmd{
name: "delete",
descr: "Deletes a host from the network",
checkLock: true,
do: func(subCmdCtx subCmdCtx) error {
flags := subCmdCtx.flagSet(false)
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hostName := flags.StringP(
"hostname", "h", "",
"Name of the host to delete",
)
if err := flags.Parse(subCmdCtx.args); err != nil {
return fmt.Errorf("parsing flags: %w", err)
}
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if *hostName == "" {
return errors.New("--hostname is required")
}
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hostBootstrap, err := loadHostBootstrap()
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if err != nil {
return fmt.Errorf("loading host bootstrap: %w", err)
}
client := hostBootstrap.GlobalBucketS3APIClient()
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return bootstrap.RemoveGarageBootstrapHost(subCmdCtx.ctx, client, *hostName)
},
}
var subCmdHosts = subCmd{
name: "hosts",
descr: "Sub-commands having to do with configuration of hosts in the network",
do: func(subCmdCtx subCmdCtx) error {
return subCmdCtx.doSubCmd(
subCmdHostsDelete,
subCmdHostsList,
)
},
}