// outputDotFile generates a .dot file describing the current state of
// the gossip network. nodes is a map from network address to gossip
// node. edgeSet is empty on the first invocation, but
// its content is set to encompass the entire set of edges in the
// network when this method returns. It should be resupplied with each
// successive invocation, as it is used to determine which edges are
// new and which have been deleted and show those changes visually in
// the output graph. New edges are drawn green; edges which were
// removed over the course of the last simulation step(s) are drawn in
// a lightly-dashed red.
//
// The format of the output looks like this:
//
// digraph G {
// node [shape=record];
// node1 [fontsize=12,label="{Node 1|MH=3}"]
// node1 -> node3 [color=green]
// node1 -> node4
// node1 -> node5 [color=red,style=dotted]
// node2 [fontsize=24,label="{Node 2|MH=2}"]
// node2 -> node5
// node3 [fontsize=18,label="{Node 3|MH=5}"]
// node3 -> node5
// node3 -> node4
// node4 [fontsize=24,label="{Node 4|MH=4}"]
// node4 -> node2
// node5 [fontsize=24,label="{Node 5|MH=1}"]
// node5 -> node2
// node5 -> node3
// }
func outputDotFile(dotFN string, cycle int, nodes map[string]*gossip.Gossip, edgeSet map[string]edge) string {
f, err := os.Create(dotFN)
if err != nil {
log.Fatalf("unable to create temp file: %s", err)
}
defer f.Close()
// Determine maximum number of incoming connections. Create outgoing
// edges, keeping track of which are new since last time (added=true).
outgoingMap := make(edgeMap)
sortedAddresses := util.MapKeys(nodes).([]string)
sort.Strings(sortedAddresses)
var maxIncoming int
// The order the graph file is written influences the arrangement
// of nodes in the output image, so it makes sense to eliminate
// randomness here. Unfortunately with graphviz it's fairly hard
// to get a consistent ordering.
for _, addr := range sortedAddresses {
node := nodes[addr]
incoming := node.Incoming()
for _, iAddr := range incoming {
e := edge{dest: addr}
key := fmt.Sprintf("%s:%s", iAddr.String(), addr)
if _, ok := edgeSet[key]; !ok {
e.added = true
}
delete(edgeSet, key)
outgoingMap.addEdge(iAddr.String(), e)
}
if len(incoming) > maxIncoming {
maxIncoming = len(incoming)
}
}
// Find all edges which were deleted.
for key, e := range edgeSet {
e.added = false
e.deleted = true
outgoingMap.addEdge(strings.Split(key, ":")[0], e)
delete(edgeSet, key)
}
f.WriteString("digraph G {\n")
f.WriteString("node [shape=record];\n")
for _, addr := range sortedAddresses {
node := nodes[addr]
var incomplete int
var totalAge int64
for infoKey := range nodes {
if infoKey == addr {
continue // skip the node's own info
}
if val, err := node.GetInfo(infoKey); err != nil {
log.Infof("error getting info for key %q: %s", infoKey, err)
incomplete++
} else {
totalAge += int64(cycle) - val.(int64)
}
}
var sentinelAge int64
if val, err := node.GetInfo(gossip.KeySentinel); err != nil {
log.Infof("error getting info for sentinel gossip key %q: %s", gossip.KeySentinel, err)
} else {
sentinelAge = int64(cycle) - val.(int64)
}
var age, nodeColor string
if incomplete > 0 {
nodeColor = "color=red,"
age = fmt.Sprintf("missing %d", incomplete)
} else {
age = strconv.FormatFloat(float64(totalAge)/float64(len(nodes)-1), 'f', 2, 64)
}
fontSize := minDotFontSize
if maxIncoming > 0 {
fontSize = minDotFontSize + int(math.Floor(float64(len(node.Incoming())*
(maxDotFontSize-minDotFontSize))/float64(maxIncoming)))
}
f.WriteString(fmt.Sprintf("\t%s [%sfontsize=%d,label=\"{%s|MH=%d, AA=%s, SA=%d}\"]\n",
node.Name, nodeColor, fontSize, node.Name, node.MaxHops(), age, sentinelAge))
outgoing := outgoingMap[addr]
for _, e := range outgoing {
dest := nodes[e.dest]
style := ""
if e.added {
style = " [color=green]"
} else if e.deleted {
style = " [color=red,style=dotted]"
}
f.WriteString(fmt.Sprintf("\t%s -> %s%s\n", node.Name, dest.Name, style))
if !e.deleted {
edgeSet[fmt.Sprintf("%s:%s", addr, e.dest)] = e
}
}
}
f.WriteString("}\n")
return f.Name()
}
ConditionalPut: struct{}{},
Increment: struct{}{},
Delete: struct{}{},
DeleteRange: struct{}{},
EndTransaction: struct{}{},
AccumulateTS: struct{}{},
ReapQueue: struct{}{},
EnqueueUpdate: struct{}{},
EnqueueMessage: struct{}{},
InternalHeartbeatTxn: struct{}{},
InternalPushTxn: struct{}{},
InternalResolveIntent: struct{}{},
}
// ReadMethods lists the read-only methods supported by a range.
var ReadMethods = util.MapKeys(readMethods).([]string)
// WriteMethods lists the methods supported by a range which write data.
var WriteMethods = util.MapKeys(writeMethods).([]string)
// Methods lists all the methods supported by a range.
var Methods = append(ReadMethods, WriteMethods...)
// NeedReadPerm returns true if the specified method requires read permissions.
func NeedReadPerm(method string) bool {
_, ok := readMethods[method]
return ok
}
// NeedWritePerm returns true if the specified method requires write permissions.
func NeedWritePerm(method string) bool {