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package shell
import ( "bytes" "flag" "fmt" "github.com/chrislusf/seaweedfs/weed/filer" "github.com/chrislusf/seaweedfs/weed/pb/s3_pb" "github.com/chrislusf/seaweedfs/weed/s3api/s3_constants" "io" "strconv" "strings"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb" )
var LoadConfig = loadConfig
func init() { Commands = append(Commands, &commandS3CircuitBreaker{}) }
type commandS3CircuitBreaker struct { }
func (c *commandS3CircuitBreaker) Name() string { return "s3.circuitBreaker" }
func (c *commandS3CircuitBreaker) Help() string { return `configure and apply s3 circuit breaker options for each bucket
# examples # add circuit breaker config for global s3.circuitBreaker -global -type count -actions Read,Write -values 500,200 -apply
# disable global config s3.circuitBreaker -global -disable -apply
# add circuit breaker config for buckets x,y,z s3.circuitBreaker -buckets x,y,z -type count -actions Read,Write -values 200,100 -apply
# disable circuit breaker config of x s3.circuitBreaker -buckets x -disable -apply
# delete circuit breaker config of x s3.circuitBreaker -buckets x -delete -apply
# clear all circuit breaker config s3.circuitBreaker -delete -apply ` }
func (c *commandS3CircuitBreaker) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) { dir := s3_constants.CircuitBreakerConfigDir file := s3_constants.CircuitBreakerConfigFile
s3CircuitBreakerCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError) buckets := s3CircuitBreakerCommand.String("buckets", "", "the bucket name(s) to configure, eg: -buckets x,y,z") global := s3CircuitBreakerCommand.Bool("global", false, "configure global circuit breaker")
actions := s3CircuitBreakerCommand.String("actions", "", "comma separated actions names: Read,Write,List,Tagging,Admin") limitType := s3CircuitBreakerCommand.String("type", "", "'Count' or 'MB'; Count represents the number of simultaneous requests, and MB represents the content size of all simultaneous requests") values := s3CircuitBreakerCommand.String("values", "", "comma separated values")
disabled := s3CircuitBreakerCommand.Bool("disable", false, "disable global or buckets circuit breaker") deleted := s3CircuitBreakerCommand.Bool("delete", false, "delete circuit breaker config")
apply := s3CircuitBreakerCommand.Bool("apply", false, "update and apply current configuration")
if err = s3CircuitBreakerCommand.Parse(args); err != nil { return nil
}
var buf bytes.Buffer err = LoadConfig(commandEnv, dir, file, &buf) if err != nil { return err }
cbCfg := &s3_pb.S3CircuitBreakerConfig{ Buckets: make(map[string]*s3_pb.S3CircuitBreakerOptions), } if buf.Len() > 0 { if err = filer.ParseS3ConfigurationFromBytes(buf.Bytes(), cbCfg); err != nil { return err } }
if *deleted { cmdBuckets, cmdActions, _, err := c.initActionsAndValues(buckets, actions, limitType, values, true) if err != nil { return err }
if len(cmdBuckets) <= 0 && !*global { if len(cmdActions) > 0 { deleteGlobalActions(cbCfg, cmdActions, limitType) if cbCfg.Buckets != nil { var allBuckets []string for bucket := range cbCfg.Buckets { allBuckets = append(allBuckets, bucket) } deleteBucketsActions(allBuckets, cbCfg, cmdActions, limitType) } } else { cbCfg.Global = nil cbCfg.Buckets = nil } } else { if len(cmdBuckets) > 0 { deleteBucketsActions(cmdBuckets, cbCfg, cmdActions, limitType) } if *global { deleteGlobalActions(cbCfg, cmdActions, nil) } } } else { cmdBuckets, cmdActions, cmdValues, err := c.initActionsAndValues(buckets, actions, limitType, values, *disabled) if err != nil { return err }
if len(cmdActions) > 0 && len(*buckets) <= 0 && !*global { return fmt.Errorf("one of -global and -buckets must be specified") }
if len(*buckets) > 0 { for _, bucket := range cmdBuckets { var cbOptions *s3_pb.S3CircuitBreakerOptions var exists bool if cbOptions, exists = cbCfg.Buckets[bucket]; !exists { cbOptions = &s3_pb.S3CircuitBreakerOptions{} cbCfg.Buckets[bucket] = cbOptions } cbOptions.Enabled = !*disabled
if len(cmdActions) > 0 { err = insertOrUpdateValues(cbOptions, cmdActions, cmdValues, limitType) if err != nil { return err } }
if len(cbOptions.Actions) <= 0 && !cbOptions.Enabled { delete(cbCfg.Buckets, bucket) } } }
if *global { globalOptions := cbCfg.Global if globalOptions == nil { globalOptions = &s3_pb.S3CircuitBreakerOptions{Actions: make(map[string]int64, len(cmdActions))} cbCfg.Global = globalOptions } globalOptions.Enabled = !*disabled
if len(cmdActions) > 0 { err = insertOrUpdateValues(globalOptions, cmdActions, cmdValues, limitType) if err != nil { return err } }
if len(globalOptions.Actions) <= 0 && !globalOptions.Enabled { cbCfg.Global = nil } } }
buf.Reset() err = filer.ProtoToText(&buf, cbCfg) if err != nil { return err }
_, _ = fmt.Fprintf(writer, string(buf.Bytes())) _, _ = fmt.Fprintln(writer)
if *apply { if err := commandEnv.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error { return filer.SaveInsideFiler(client, dir, file, buf.Bytes()) }); err != nil { return err } }
return nil }
func loadConfig(commandEnv *CommandEnv, dir string, file string, buf *bytes.Buffer) error { if err := commandEnv.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error { return filer.ReadEntry(commandEnv.MasterClient, client, dir, file, buf) }); err != nil && err != filer_pb.ErrNotFound { return err } return nil }
func insertOrUpdateValues(cbOptions *s3_pb.S3CircuitBreakerOptions, cmdActions []string, cmdValues []int64, limitType *string) error { if len(*limitType) == 0 { return fmt.Errorf("type not valid, only 'count' and 'bytes' are allowed") }
if cbOptions.Actions == nil { cbOptions.Actions = make(map[string]int64, len(cmdActions)) }
if len(cmdValues) > 0 { for i, action := range cmdActions { cbOptions.Actions[s3_constants.Concat(action, *limitType)] = cmdValues[i] } } return nil }
func deleteBucketsActions(cmdBuckets []string, cbCfg *s3_pb.S3CircuitBreakerConfig, cmdActions []string, limitType *string) { if cbCfg.Buckets == nil { return }
if len(cmdActions) == 0 { for _, bucket := range cmdBuckets { delete(cbCfg.Buckets, bucket) } } else { for _, bucket := range cmdBuckets { if cbOption, ok := cbCfg.Buckets[bucket]; ok { if len(cmdActions) > 0 && cbOption.Actions != nil { for _, action := range cmdActions { delete(cbOption.Actions, s3_constants.Concat(action, *limitType)) } }
if len(cbOption.Actions) == 0 && !cbOption.Enabled { delete(cbCfg.Buckets, bucket) } } } }
if len(cbCfg.Buckets) == 0 { cbCfg.Buckets = nil } }
func deleteGlobalActions(cbCfg *s3_pb.S3CircuitBreakerConfig, cmdActions []string, limitType *string) { globalOptions := cbCfg.Global if globalOptions == nil { return }
if len(cmdActions) == 0 && globalOptions.Actions != nil { globalOptions.Actions = nil return } else { for _, action := range cmdActions { delete(globalOptions.Actions, s3_constants.Concat(action, *limitType)) } }
if len(globalOptions.Actions) == 0 && !globalOptions.Enabled { cbCfg.Global = nil } }
func (c *commandS3CircuitBreaker) initActionsAndValues(buckets, actions, limitType, values *string, parseValues bool) (cmdBuckets, cmdActions []string, cmdValues []int64, err error) { if len(*buckets) > 0 { cmdBuckets = strings.Split(*buckets, ",") }
if len(*actions) > 0 { cmdActions = strings.Split(*actions, ",")
//check action valid
for _, action := range cmdActions { var found bool for _, allowedAction := range s3_constants.AllowedActions { if allowedAction == action { found = true } } if !found { return nil, nil, nil, fmt.Errorf("value(%s) of flag[-action] not valid, allowed actions: %v", *actions, s3_constants.AllowedActions) } } }
if !parseValues { if len(cmdActions) < 0 { for _, action := range s3_constants.AllowedActions { cmdActions = append(cmdActions, action) } }
if len(*limitType) > 0 { switch *limitType { case s3_constants.LimitTypeCount: elements := strings.Split(*values, ",") if len(cmdActions) != len(elements) { if len(elements) != 1 || len(elements) == 0 { return nil, nil, nil, fmt.Errorf("count of flag[-actions] and flag[-counts] not equal") } v, err := strconv.Atoi(elements[0]) if err != nil { return nil, nil, nil, fmt.Errorf("value of -values must be a legal number(s)") } for range cmdActions { cmdValues = append(cmdValues, int64(v)) } } else { for _, value := range elements { v, err := strconv.Atoi(value) if err != nil { return nil, nil, nil, fmt.Errorf("value of -values must be a legal number(s)") } cmdValues = append(cmdValues, int64(v)) } } case s3_constants.LimitTypeBytes: elements := strings.Split(*values, ",") if len(cmdActions) != len(elements) { if len(elements) != 1 || len(elements) == 0 { return nil, nil, nil, fmt.Errorf("values count of -actions and -values not equal") } v, err := parseMBToBytes(elements[0]) if err != nil { return nil, nil, nil, fmt.Errorf("value of -max must be a legal number(s)") } for range cmdActions { cmdValues = append(cmdValues, v) } } else { for _, value := range elements { v, err := parseMBToBytes(value) if err != nil { return nil, nil, nil, fmt.Errorf("value of -max must be a legal number(s)") } cmdValues = append(cmdValues, v) } } default: return nil, nil, nil, fmt.Errorf("type not valid, only 'count' and 'bytes' are allowed") } } else { *limitType = "" } } return cmdBuckets, cmdActions, cmdValues, nil }
func parseMBToBytes(valStr string) (int64, error) { v, err := strconv.Atoi(valStr) v *= 1024 * 1024 return int64(v), err }
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