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misc: Golint fixes

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This commit is contained in:
James Shubin
2016-09-02 01:03:40 -04:00
parent 5e3f03df06
commit b46432b5b6
6 changed files with 132 additions and 113 deletions
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5
config.go
View File

@@ -43,6 +43,7 @@ type edgeConfig struct {
To vertexConfig `yaml:"to"`
}
// GraphConfig is the data structure that describes a single graph to run.
type GraphConfig struct {
Graph string `yaml:"graph"`
Resources struct {
@@ -60,6 +61,7 @@ type GraphConfig struct {
Remote string `yaml:"remote"`
}
// Parse parses a data stream into the graph structure.
func (c *GraphConfig) Parse(data []byte) error {
if err := yaml.Unmarshal(data, c); err != nil {
return err
@@ -70,6 +72,7 @@ func (c *GraphConfig) Parse(data []byte) error {
return nil
}
// ParseConfigFromFile takes a filename and returns the graph config structure.
func ParseConfigFromFile(filename string) *GraphConfig {
data, err := ioutil.ReadFile(filename)
if err != nil {
@@ -295,7 +298,7 @@ func (g *Graph) addEdgesByMatchingUUIDS(v *Vertex, uuids []ResUUID) []bool {
return result
}
// add auto edges to graph
// AutoEdges adds the automatic edges to the graph.
func (g *Graph) AutoEdges() {
log.Println("Compile: Adding AutoEdges...")
for _, v := range g.GetVertices() { // for each vertexes autoedges

53
etcd.go
View File

@@ -69,6 +69,7 @@ import (
"google.golang.org/grpc"
)
// constant parameters which may need to be tweaked or customized
const (
NS = "_mgmt" // root namespace for mgmt operations
seedSentinel = "_seed" // you must not name your hostname this
@@ -83,7 +84,7 @@ const (
)
var (
ErrApplyDeltaEventsInconsistent = errors.New("Etcd: ApplyDeltaEvents: Inconsistent key!")
errApplyDeltaEventsInconsistent = errors.New("Etcd: ApplyDeltaEvents: Inconsistent key!")
)
// AW is a struct for the AddWatcher queue
@@ -161,7 +162,7 @@ type EmbdEtcd struct { // EMBeddeD etcd
exitTimeout <-chan time.Time
hostname string
memberId uint64 // cluster membership id of server if running
memberID uint64 // cluster membership id of server if running
endpoints etcdtypes.URLsMap // map of servers a client could connect to
clientURLs etcdtypes.URLs // locations to listen for clients if i am a server
serverURLs etcdtypes.URLs // locations to listen for servers if i am a server (peer)
@@ -283,7 +284,7 @@ func (obj *EmbdEtcd) Connect(reconnect bool) error {
return nil
}
}
var emax uint16 = 0
var emax uint16 // = 0
for { // loop until connect
var err error
cfg := obj.GetConfig()
@@ -516,8 +517,8 @@ func (obj *EmbdEtcd) CtxError(ctx context.Context, err error) (context.Context,
// tmin <= texp^iter - 1 <= tmax // TODO: check my math
return time.Duration(math.Min(math.Max(math.Pow(float64(texp), float64(iter))-1.0, float64(tmin)), float64(tmax))) * time.Millisecond
}
var isTimeout bool = false
var iter int = 0
var isTimeout = false
var iter int // = 0
if ctxerr, ok := ctx.Value(ctxErr).(error); ok {
if DEBUG {
log.Printf("Etcd: CtxError: err(%v), ctxerr(%v)", err, ctxerr)
@@ -1055,7 +1056,7 @@ func (obj *EmbdEtcd) rawAddWatcher(ctx context.Context, aw *AW) (func(), error)
rch := obj.client.Watcher.Watch(ctx, aw.path, aw.opts...)
obj.rLock.RUnlock()
var rev int64
var useRev bool = false
var useRev = false
var retry, locked bool = false, false
for {
response := <-rch // read
@@ -1125,7 +1126,7 @@ func (obj *EmbdEtcd) rawAddWatcher(ctx context.Context, aw *AW) (func(), error)
// rawCallback is the companion to AddWatcher which runs the callback processing
func rawCallback(ctx context.Context, re *RE) error {
var err error = re.err // the watch event itself might have had an error
var err = re.err // the watch event itself might have had an error
if err == nil {
if callback := re.callback; callback != nil {
// TODO: we could add an async option if needed
@@ -1290,7 +1291,11 @@ func (obj *EmbdEtcd) volunteerCallback(re *RE) error {
log.Printf("Etcd: Quitters: Shutting down %d members...", lq)
}
for _, quitter := range quitters {
if mID, ok := Uint64KeyFromStrInMap(quitter, membersMap); ok {
mID, ok := Uint64KeyFromStrInMap(quitter, membersMap)
if !ok {
// programming error
log.Fatalf("Etcd: Member Remove: Error: %v(%v) not in members list!", quitter, mID)
}
EtcdNominate(obj, quitter, nil) // unnominate
// once we issue the above unnominate, that peer will
// shutdown, and this might cause us to loose quorum,
@@ -1326,11 +1331,6 @@ func (obj *EmbdEtcd) volunteerCallback(re *RE) error {
obj.endpointCallback(nil) // update!
log.Printf("Member %s (%d) removed successfully!", quitter, mID)
return &CtxReconnectErr{"a member was removed"} // retry asap and update endpoint list
} else {
// programming error
log.Fatalf("Etcd: Member Remove: Error: %v(%v) not in members list!", quitter, mID)
}
}
return nil
@@ -1344,7 +1344,7 @@ func (obj *EmbdEtcd) nominateCallback(re *RE) error {
defer log.Printf("Trace: Etcd: nominateCallback(): Finished!")
}
bootstrapping := len(obj.endpoints) == 0
var revision int64 = 0
var revision int64 // = 0
if re != nil {
revision = re.response.Header.Revision
}
@@ -1366,7 +1366,7 @@ func (obj *EmbdEtcd) nominateCallback(re *RE) error {
nominated := obj.nominated
if nominated, err := ApplyDeltaEvents(re, nominated); err == nil {
obj.nominated = nominated
} else if !re.retryHint || err != ErrApplyDeltaEventsInconsistent {
} else if !re.retryHint || err != errApplyDeltaEventsInconsistent {
log.Fatal(err)
}
@@ -1442,13 +1442,13 @@ func (obj *EmbdEtcd) nominateCallback(re *RE) error {
if len(obj.nominated) != 0 { // don't call if nobody left but me!
// this works around: https://github.com/coreos/etcd/issues/5482,
// and it probably makes sense to avoid calling if we're the last
log.Printf("Etcd: Member Remove: Removing self: %v", obj.memberId)
removed, err := EtcdMemberRemove(obj, obj.memberId)
log.Printf("Etcd: Member Remove: Removing self: %v", obj.memberID)
removed, err := EtcdMemberRemove(obj, obj.memberID)
if err != nil {
return fmt.Errorf("Etcd: Member Remove: Error: %+v", err)
}
if removed {
log.Printf("Etcd: Member Removed (self): %v(%v)", obj.hostname, obj.memberId)
log.Printf("Etcd: Member Removed (self): %v(%v)", obj.hostname, obj.memberID)
}
}
@@ -1512,7 +1512,7 @@ func (obj *EmbdEtcd) endpointCallback(re *RE) error {
}
// change detection
var changed bool = false // do we need to update?
var changed = false // do we need to update?
if len(obj.endpoints) != len(endpoints) {
changed = true
}
@@ -1662,7 +1662,7 @@ func (obj *EmbdEtcd) StartServer(newCluster bool, peerURLsMap etcdtypes.URLsMap)
}
//log.Fatal(<-obj.server.Err()) XXX
log.Printf("Etcd: StartServer: Server running...")
obj.memberId = uint64(obj.server.Server.ID()) // store member id for internal use
obj.memberID = uint64(obj.server.Server.ID()) // store member id for internal use
obj.serverwg.Add(1)
return nil
@@ -1677,7 +1677,7 @@ func (obj *EmbdEtcd) DestroyServer() error {
}
log.Printf("Etcd: DestroyServer: Done closing...")
obj.memberId = 0
obj.memberID = 0
if obj.server == nil { // skip the .Done() below because we didn't .Add(1) it.
return err
}
@@ -1901,11 +1901,11 @@ func EtcdAddHostnameConvergedWatcher(obj *EmbdEtcd, callbackFn func(map[string]b
internalCbFn := func(re *RE) error {
// TODO: get the value from the response, and apply delta...
// for now, just run a get operation which is easier to code!
if m, err := EtcdHostnameConverged(obj); err == nil {
return callbackFn(m) // call my function
} else {
m, err := EtcdHostnameConverged(obj)
if err != nil {
return err
}
return callbackFn(m) // call my function
}
return obj.AddWatcher(path, internalCbFn, true, true, etcd.WithPrefix()) // no block and no converger reset
}
@@ -1944,6 +1944,7 @@ func EtcdGetClusterSize(obj *EmbdEtcd) (uint16, error) {
return uint16(v), nil
}
// EtcdMemberAdd adds a member to the cluster.
func EtcdMemberAdd(obj *EmbdEtcd, peerURLs etcdtypes.URLs) (*etcd.MemberAddResponse, error) {
//obj.Connect(false) // TODO ?
ctx := context.Background()
@@ -1967,7 +1968,7 @@ func EtcdMemberAdd(obj *EmbdEtcd, peerURLs etcdtypes.URLs) (*etcd.MemberAddRespo
}
// EtcdMemberRemove removes a member by mID and returns if it worked, and also
// if there was an error. This is because It might have run without error, but
// if there was an error. This is because it might have run without error, but
// the member wasn't found, for example.
func EtcdMemberRemove(obj *EmbdEtcd, mID uint64) (bool, error) {
//obj.Connect(false) // TODO ?
@@ -2260,7 +2261,7 @@ func ApplyDeltaEvents(re *RE, urlsmap etcdtypes.URLsMap) (etcdtypes.URLsMap, err
if DEBUG {
log.Printf("Etcd: ApplyDeltaEvents: Inconsistent key: %v", key)
}
return nil, ErrApplyDeltaEventsInconsistent
return nil, errApplyDeltaEventsInconsistent
}
delete(urlsmap, key)

17
event.go
View File

@@ -29,8 +29,10 @@ const (
eventBackPoke
)
// Resp is a channel to be used for boolean responses.
type Resp chan bool
// Event is the main struct that stores event information and responses.
type Event struct {
Name eventName
Resp Resp // channel to send an ack response on, nil to skip
@@ -39,45 +41,46 @@ type Event struct {
Activity bool // did something interesting happen?
}
// send a single acknowledgement on the channel if one was requested
// ACK sends a single acknowledgement on the channel if one was requested.
func (event *Event) ACK() {
if event.Resp != nil { // if they've requested an ACK
event.Resp.ACK()
}
}
// NACK sends a negative acknowledgement message on the channel if one was requested.
func (event *Event) NACK() {
if event.Resp != nil { // if they've requested a NACK
event.Resp.NACK()
}
}
// Resp is just a helper to return the right type of response channel
// NewResp is just a helper to return the right type of response channel.
func NewResp() Resp {
resp := make(chan bool)
return resp
}
// ACK sends a true value to resp
// ACK sends a true value to resp.
func (resp Resp) ACK() {
if resp != nil {
resp <- true
}
}
// NACK sends a false value to resp
// NACK sends a false value to resp.
func (resp Resp) NACK() {
if resp != nil {
resp <- false
}
}
// Wait waits for any response from a Resp channel and returns it
// Wait waits for any response from a Resp channel and returns it.
func (resp Resp) Wait() bool {
return <-resp
}
// ACKWait waits for a +ive Ack from a Resp channel
// ACKWait waits for a +ive Ack from a Resp channel.
func (resp Resp) ACKWait() {
for {
// wait until true value
@@ -87,7 +90,7 @@ func (resp Resp) ACKWait() {
}
}
// get the activity value
// GetActivity returns the activity value.
func (event *Event) GetActivity() bool {
return event.Activity
}

1
main.go
View File

@@ -38,6 +38,7 @@ var (
prefix = fmt.Sprintf("/var/lib/%s/", program)
)
// variables controlling verbosity
const (
DEBUG = false // add additional log messages
TRACE = false // add execution flow log messages

102
pgraph.go
View File

@@ -43,6 +43,7 @@ const (
graphStatePaused
)
// Graph is the graph structure in this library.
// The graph abstract data type (ADT) is defined as follows:
// * the directed graph arrows point from left to right ( -> )
// * the arrows point away from their dependencies (eg: arrows mean "before")
@@ -55,15 +56,18 @@ type Graph struct {
mutex sync.Mutex // used when modifying graph State variable
}
// Vertex is the primary vertex struct in this library.
type Vertex struct {
Res // anonymous field
timestamp int64 // last updated timestamp ?
}
// Edge is the primary edge struct in this library.
type Edge struct {
Name string
}
// NewGraph builds a new graph.
func NewGraph(name string) *Graph {
return &Graph{
Name: name,
@@ -72,12 +76,14 @@ func NewGraph(name string) *Graph {
}
}
// NewVertex returns a new graph vertex struct with a contained resource.
func NewVertex(r Res) *Vertex {
return &Vertex{
Res: r,
}
}
// NewEdge returns a new graph edge struct.
func NewEdge(name string) *Edge {
return &Edge{
Name: name,
@@ -97,27 +103,30 @@ func (g *Graph) Copy() *Graph {
return newGraph
}
// returns the name of the graph
// GetName returns the name of the graph.
func (g *Graph) GetName() string {
return g.Name
}
// set name of the graph
// SetName sets the name of the graph.
func (g *Graph) SetName(name string) {
g.Name = name
}
func (g *Graph) GetState() graphState {
// getState returns the state of the graph. This state is used for optimizing
// certain algorithms by knowing what part of processing the graph is currently
// undergoing.
func (g *Graph) getState() graphState {
//g.mutex.Lock()
//defer g.mutex.Unlock()
return g.state
}
// set graph state and return previous state
func (g *Graph) SetState(state graphState) graphState {
// setState sets the graph state and returns the previous state.
func (g *Graph) setState(state graphState) graphState {
g.mutex.Lock()
defer g.mutex.Unlock()
prev := g.GetState()
prev := g.getState()
g.state = state
return prev
}
@@ -131,6 +140,7 @@ func (g *Graph) AddVertex(xv ...*Vertex) {
}
}
// DeleteVertex deletes a particular vertex from the graph.
func (g *Graph) DeleteVertex(v *Vertex) {
delete(g.Adjacency, v)
for k := range g.Adjacency {
@@ -138,7 +148,7 @@ func (g *Graph) DeleteVertex(v *Vertex) {
}
}
// adds a directed edge to the graph from v1 to v2
// AddEdge adds a directed edge to the graph from v1 to v2.
func (g *Graph) AddEdge(v1, v2 *Vertex, e *Edge) {
// NOTE: this doesn't allow more than one edge between two vertexes...
g.AddVertex(v1, v2) // supports adding N vertices now
@@ -147,6 +157,8 @@ func (g *Graph) AddEdge(v1, v2 *Vertex, e *Edge) {
g.Adjacency[v1][v2] = e
}
// GetVertexMatch searches for an equivalent resource in the graph and returns
// the vertex it is found in, or nil if not found.
func (g *Graph) GetVertexMatch(obj Res) *Vertex {
for k := range g.Adjacency {
if k.Res.Compare(obj) {
@@ -156,6 +168,7 @@ func (g *Graph) GetVertexMatch(obj Res) *Vertex {
return nil
}
// HasVertex returns if the input vertex exists in the graph.
func (g *Graph) HasVertex(v *Vertex) bool {
if _, exists := g.Adjacency[v]; exists {
return true
@@ -163,12 +176,12 @@ func (g *Graph) HasVertex(v *Vertex) bool {
return false
}
// number of vertices in the graph
// NumVertices returns the number of vertices in the graph.
func (g *Graph) NumVertices() int {
return len(g.Adjacency)
}
// number of edges in the graph
// NumEdges returns the number of edges in the graph.
func (g *Graph) NumEdges() int {
count := 0
for k := range g.Adjacency {
@@ -187,7 +200,7 @@ func (g *Graph) GetVertices() []*Vertex {
return vertices
}
// returns a channel of all vertices in the graph
// GetVerticesChan returns a channel of all vertices in the graph.
func (g *Graph) GetVerticesChan() chan *Vertex {
ch := make(chan *Vertex)
go func(ch chan *Vertex) {
@@ -199,6 +212,7 @@ func (g *Graph) GetVerticesChan() chan *Vertex {
return ch
}
// VertexSlice is a linear list of vertices. It can be sorted.
type VertexSlice []*Vertex
func (vs VertexSlice) Len() int { return len(vs) }
@@ -216,7 +230,7 @@ func (g *Graph) GetVerticesSorted() []*Vertex {
return vertices
}
// make the graph pretty print
// String makes the graph pretty print.
func (g *Graph) String() string {
return fmt.Sprintf("Vertices(%d), Edges(%d)", g.NumVertices(), g.NumEdges())
}
@@ -226,7 +240,7 @@ func (v *Vertex) String() string {
return fmt.Sprintf("%s[%s]", v.Res.Kind(), v.Res.GetName())
}
// output the graph in graphviz format
// Graphviz outputs the graph in graphviz format.
// https://en.wikipedia.org/wiki/DOT_%28graph_description_language%29
func (g *Graph) Graphviz() (out string) {
//digraph g {
@@ -258,7 +272,8 @@ func (g *Graph) Graphviz() (out string) {
return
}
// write out the graphviz data and run the correct graphviz filter command
// ExecGraphviz writes out the graphviz data and runs the correct graphviz
// filter command.
func (g *Graph) ExecGraphviz(program, filename string) error {
switch program {
@@ -308,8 +323,8 @@ func (g *Graph) ExecGraphviz(program, filename string) error {
return nil
}
// return an array (slice) of all directed vertices to vertex v (??? -> v)
// OKTimestamp should use this
// IncomingGraphEdges returns an array (slice) of all directed vertices to
// vertex v (??? -> v). OKTimestamp should probably use this.
func (g *Graph) IncomingGraphEdges(v *Vertex) []*Vertex {
// TODO: we might be able to implement this differently by reversing
// the Adjacency graph and then looping through it again...
@@ -324,8 +339,8 @@ func (g *Graph) IncomingGraphEdges(v *Vertex) []*Vertex {
return s
}
// return an array (slice) of all vertices that vertex v points to (v -> ???)
// poke should use this
// OutgoingGraphEdges returns an array (slice) of all vertices that vertex v
// points to (v -> ???). Poke should probably use this.
func (g *Graph) OutgoingGraphEdges(v *Vertex) []*Vertex {
var s []*Vertex
for k := range g.Adjacency[v] { // forward paths
@@ -334,7 +349,8 @@ func (g *Graph) OutgoingGraphEdges(v *Vertex) []*Vertex {
return s
}
// return an array (slice) of all vertices that connect to vertex v
// GraphEdges returns an array (slice) of all vertices that connect to vertex v.
// This is the union of IncomingGraphEdges and OutgoingGraphEdges.
func (g *Graph) GraphEdges(v *Vertex) []*Vertex {
var s []*Vertex
s = append(s, g.IncomingGraphEdges(v)...)
@@ -342,6 +358,7 @@ func (g *Graph) GraphEdges(v *Vertex) []*Vertex {
return s
}
// DFS returns a depth first search for the graph, starting at the input vertex.
func (g *Graph) DFS(start *Vertex) []*Vertex {
var d []*Vertex // discovered
var s []*Vertex // stack
@@ -364,7 +381,7 @@ func (g *Graph) DFS(start *Vertex) []*Vertex {
return d
}
// build a new graph containing only vertices from the list...
// FilterGraph builds a new graph containing only vertices from the list.
func (g *Graph) FilterGraph(name string, vertices []*Vertex) *Graph {
newgraph := NewGraph(name)
for k1, x := range g.Adjacency {
@@ -378,8 +395,8 @@ func (g *Graph) FilterGraph(name string, vertices []*Vertex) *Graph {
return newgraph
}
// return a channel containing the N disconnected graphs in our main graph
// we can then process each of these in parallel
// GetDisconnectedGraphs returns a channel containing the N disconnected graphs
// in our main graph. We can then process each of these in parallel.
func (g *Graph) GetDisconnectedGraphs() chan *Graph {
ch := make(chan *Graph)
go func() {
@@ -414,8 +431,7 @@ func (g *Graph) GetDisconnectedGraphs() chan *Graph {
return ch
}
// return the indegree for the graph, IOW the count of vertices that point to me
// NOTE: this returns the values for all vertices in one big lookup table
// InDegree returns the count of vertices that point to me in one big lookup map.
func (g *Graph) InDegree() map[*Vertex]int {
result := make(map[*Vertex]int)
for k := range g.Adjacency {
@@ -430,8 +446,7 @@ func (g *Graph) InDegree() map[*Vertex]int {
return result
}
// return the outdegree for the graph, IOW the count of vertices that point away
// NOTE: this returns the values for all vertices in one big lookup table
// OutDegree returns the count of vertices that point away in one big lookup map.
func (g *Graph) OutDegree() map[*Vertex]int {
result := make(map[*Vertex]int)
@@ -444,7 +459,7 @@ func (g *Graph) OutDegree() map[*Vertex]int {
return result
}
// returns a topological sort for the graph
// TopologicalSort returns the sort of graph vertices in that order.
// based on descriptions and code from wikipedia and rosetta code
// TODO: add memoization, and cache invalidation to speed this up :)
func (g *Graph) TopologicalSort() (result []*Vertex, ok bool) { // kahn's algorithm
@@ -626,15 +641,6 @@ func (g *Graph) VertexMerge(v1, v2 *Vertex, vertexMergeFn func(*Vertex, *Vertex)
return nil // success
}
func HeisenbergCount(ch chan *Vertex) int {
c := 0
for x := range ch {
_ = x
c++
}
return c
}
// GetTimestamp returns the timestamp of a vertex
func (v *Vertex) GetTimestamp() int64 {
return v.timestamp
@@ -646,7 +652,7 @@ func (v *Vertex) UpdateTimestamp() int64 {
return v.timestamp
}
// can this element run right now?
// OKTimestamp returns true if this element can run right now?
func (g *Graph) OKTimestamp(v *Vertex) bool {
// these are all the vertices pointing TO v, eg: ??? -> v
for _, n := range g.IncomingGraphEdges(v) {
@@ -665,14 +671,14 @@ func (g *Graph) OKTimestamp(v *Vertex) bool {
return true
}
// notify nodes after me in the dependency graph that they need refreshing...
// Poke notifies nodes after me in the dependency graph that they need refreshing...
// NOTE: this assumes that this can never fail or need to be rescheduled
func (g *Graph) Poke(v *Vertex, activity bool) {
// these are all the vertices pointing AWAY FROM v, eg: v -> ???
for _, n := range g.OutgoingGraphEdges(v) {
// XXX: if we're in state event and haven't been cancelled by
// apply, then we can cancel a poke to a child, right? XXX
// XXX: if n.Res.GetState() != resStateEvent { // is this correct?
// XXX: if n.Res.getState() != resStateEvent { // is this correct?
if true { // XXX
if DEBUG {
log.Printf("%v[%v]: Poke: %v[%v]", v.Kind(), v.GetName(), n.Kind(), n.GetName())
@@ -686,7 +692,7 @@ func (g *Graph) Poke(v *Vertex, activity bool) {
}
}
// poke the pre-requisites that are stale and need to run before I can run...
// BackPoke pokes the pre-requisites that are stale and need to run before I can run.
func (g *Graph) BackPoke(v *Vertex) {
// these are all the vertices pointing TO v, eg: ??? -> v
for _, n := range g.IncomingGraphEdges(v) {
@@ -710,6 +716,7 @@ func (g *Graph) BackPoke(v *Vertex) {
}
}
// Process is the primary function to execute for a particular vertex in the graph.
// XXX: rename this function
func (g *Graph) Process(v *Vertex) {
obj := v.Res
@@ -764,10 +771,11 @@ func (g *Graph) Process(v *Vertex) {
}
}
// main kick to start the graph
// Start is a main kick to start the graph. It goes through in reverse topological
// sort order so that events can't hit un-started vertices.
func (g *Graph) Start(wg *sync.WaitGroup, first bool) { // start or continue
log.Printf("State: %v -> %v", g.SetState(graphStateStarting), g.GetState())
defer log.Printf("State: %v -> %v", g.SetState(graphStateStarted), g.GetState())
log.Printf("State: %v -> %v", g.setState(graphStateStarting), g.getState())
defer log.Printf("State: %v -> %v", g.setState(graphStateStarted), g.getState())
t, _ := g.TopologicalSort()
// TODO: only calculate indegree if `first` is true to save resources
indegree := g.InDegree() // compute all of the indegree's
@@ -829,15 +837,17 @@ func (g *Graph) Start(wg *sync.WaitGroup, first bool) { // start or continue
}
}
// Pause sends pause events to the graph in a topological sort order.
func (g *Graph) Pause() {
log.Printf("State: %v -> %v", g.SetState(graphStatePausing), g.GetState())
defer log.Printf("State: %v -> %v", g.SetState(graphStatePaused), g.GetState())
log.Printf("State: %v -> %v", g.setState(graphStatePausing), g.getState())
defer log.Printf("State: %v -> %v", g.setState(graphStatePaused), g.getState())
t, _ := g.TopologicalSort()
for _, v := range t { // squeeze out the events...
v.SendEvent(eventPause, true, false)
}
}
// Exit sends exit events to the graph in a topological sort order.
func (g *Graph) Exit() {
if g == nil {
return
@@ -860,7 +870,7 @@ func (g *Graph) AssociateData(converger Converger) {
}
}
// in array function to test *Vertex in a slice of *Vertices
// VertexContains is an "in array" function to test for a vertex in a slice of vertices.
func VertexContains(needle *Vertex, haystack []*Vertex) bool {
for _, v := range haystack {
if needle == v {
@@ -870,7 +880,7 @@ func VertexContains(needle *Vertex, haystack []*Vertex) bool {
return false
}
// reverse a list of vertices
// Reverse reverses a list of vertices.
func Reverse(vs []*Vertex) []*Vertex {
//var out []*Vertex // XXX: golint suggests, but it fails testing
out := make([]*Vertex, 0) // empty list

1
remote.go
View File

@@ -1060,6 +1060,7 @@ func cleanURL(s string) string {
// Semaphore is a counting semaphore.
type Semaphore chan struct{}
// NewSemaphore creates a new semaphore.
func NewSemaphore(size int) Semaphore {
return make(Semaphore, size)
}