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* Reserving route IDs and adding rules to visors is now split into two communication steps. * Improved readability and testability of the setup procedure but splitting responsibilities to additional structures; setup.idReservoir, setup.RulesMap * Improved logging for setup procedure. * Slightly tweaked setup.Protocol to accommodate aforementioned changes.
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Evan Lin
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Sep 8, 2019
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,164 @@ | ||
| package setup | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "errors" | ||
| "fmt" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/skycoin/dmsg/cipher" | ||
|
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| "github.com/skycoin/skywire/pkg/routing" | ||
| ) | ||
|
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| type idReservoir struct { | ||
| rec map[cipher.PubKey]uint8 | ||
| ids map[cipher.PubKey][]routing.RouteID | ||
| mx sync.Mutex | ||
| } | ||
|
|
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| func newIDReservoir(routes ...routing.Route) (*idReservoir, int) { | ||
| rec := make(map[cipher.PubKey]uint8) | ||
| var total int | ||
|
|
||
| for _, rt := range routes { | ||
| if len(rt) == 0 { | ||
| continue | ||
| } | ||
| rec[rt[0].From]++ | ||
| for _, hop := range rt { | ||
| rec[hop.To]++ | ||
| } | ||
| total += len(rt) + 1 | ||
| } | ||
|
|
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| return &idReservoir{ | ||
| rec: rec, | ||
| ids: make(map[cipher.PubKey][]routing.RouteID), | ||
| }, total | ||
| } | ||
|
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| func (idr *idReservoir) ReserveIDs(ctx context.Context, reserve func(ctx context.Context, pk cipher.PubKey, n uint8) ([]routing.RouteID, error)) error { | ||
| ctx, cancel := context.WithCancel(ctx) | ||
| defer cancel() | ||
|
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||
| errCh := make(chan error, len(idr.rec)) | ||
| defer close(errCh) | ||
|
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| for pk, n := range idr.rec { | ||
| pk, n := pk, n | ||
| go func() { | ||
| ids, err := reserve(ctx, pk, n) | ||
| if err != nil { | ||
| errCh <- fmt.Errorf("reserve routeID from %s failed: %v", pk, err) | ||
| return | ||
| } | ||
| idr.mx.Lock() | ||
| idr.ids[pk] = ids | ||
| idr.mx.Unlock() | ||
| errCh <- nil | ||
| }() | ||
| } | ||
|
|
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| return finalError(len(idr.rec), errCh) | ||
| } | ||
|
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| func (idr *idReservoir) PopID(pk cipher.PubKey) (routing.RouteID, bool) { | ||
| idr.mx.Lock() | ||
| defer idr.mx.Unlock() | ||
|
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| ids, ok := idr.ids[pk] | ||
| if !ok || len(ids) == 0 { | ||
| return 0, false | ||
| } | ||
|
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| idr.ids[pk] = ids[1:] | ||
| return ids[0], true | ||
| } | ||
|
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| // RulesMap associates a slice of rules to a visor's public key. | ||
| type RulesMap map[cipher.PubKey][]routing.Rule | ||
|
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| func (rm RulesMap) String() string { | ||
| out := make(map[cipher.PubKey][]string, len(rm)) | ||
| for pk, rules := range rm { | ||
| str := make([]string, len(rules)) | ||
| for i, rule := range rules { | ||
| str[i] = rule.String() | ||
| } | ||
| out[pk] = str | ||
| } | ||
| jb, err := json.MarshalIndent(out, "", "\t") | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| return string(jb) | ||
| } | ||
|
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| // GenerateRules generates rules for a given LoopDescriptor. | ||
| // The outputs are as follows: | ||
| // - rules: a map that relates a slice of routing rules to a given visor's public key. | ||
| // - srcAppRID: the initiating node's route ID that references the FWD rule. | ||
| // - dstAppRID: the responding node's route ID that references the FWD rule. | ||
| // - err: an error (if any). | ||
| func GenerateRules(idc *idReservoir, ld routing.LoopDescriptor) (rules RulesMap, srcFwdRID, dstFwdRID routing.RouteID, err error) { | ||
| rules = make(RulesMap) | ||
| src, dst := ld.Loop.Local, ld.Loop.Remote | ||
|
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| firstFwdRID, lastFwdRID, err := SaveForwardRules(rules, idc, ld.KeepAlive, ld.Forward) | ||
| if err != nil { | ||
| return nil, 0, 0, err | ||
| } | ||
| firstRevRID, lastRevRID, err := SaveForwardRules(rules, idc, ld.KeepAlive, ld.Reverse) | ||
| if err != nil { | ||
| return nil, 0, 0, err | ||
| } | ||
|
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| rules[src.PubKey] = append(rules[src.PubKey], | ||
| routing.AppRule(ld.KeepAlive, firstRevRID, lastFwdRID, dst.PubKey, src.Port, dst.Port)) | ||
| rules[dst.PubKey] = append(rules[dst.PubKey], | ||
| routing.AppRule(ld.KeepAlive, firstFwdRID, lastRevRID, src.PubKey, dst.Port, src.Port)) | ||
|
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| return rules, firstFwdRID, firstRevRID, nil | ||
| } | ||
|
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| // SaveForwardRules creates the rules of the given route, and saves them in the 'rules' input. | ||
| // Note that the last rule for the route is always an APP rule, and so is not created here. | ||
| // The outputs are as follows: | ||
| // - firstRID: the first visor's route ID. | ||
| // - lastRID: the last visor's route ID (note that there is no rule set for this ID yet). | ||
| // - err: an error (if any). | ||
| func SaveForwardRules(rules RulesMap, idc *idReservoir, keepAlive time.Duration, route routing.Route) (firstRID, lastRID routing.RouteID, err error) { | ||
|
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| // 'firstRID' is the first visor's key routeID - this is to be returned. | ||
| var ok bool | ||
| if firstRID, ok = idc.PopID(route[0].From); !ok { | ||
| return 0, 0, errors.New("fucked up") | ||
| } | ||
|
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| var rID = firstRID | ||
| for _, hop := range route { | ||
| nxtRID, ok := idc.PopID(hop.To) | ||
| if !ok { | ||
| return 0, 0, errors.New("fucked up") | ||
| } | ||
| rule := routing.ForwardRule(keepAlive, nxtRID, hop.Transport, rID) | ||
| rules[hop.From] = append(rules[hop.From], rule) | ||
|
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| rID = nxtRID | ||
| } | ||
|
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| return firstRID, rID, nil | ||
| } | ||
|
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| func finalError(n int, errCh <-chan error) error { | ||
| var finalErr error | ||
| for i := 0; i < n; i++ { | ||
| if err := <-errCh; err != nil { | ||
| finalErr = err | ||
| } | ||
| } | ||
| return finalErr | ||
| } |
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