// Helper function to construct HTTP Peers
func mustNewHTTPPeer(u *url.URL) raft.Peer {
p, err := raft.NewHTTPPeer(u)
if err != nil {
panic(err)
}
return p
}
// propagate listens for changes in the set of Progol-validated peers, and
// propagates those changes to the Raft server.
func propagate(substrate chan []progol.Peer, raftServer *raft.Server, minimum int, ready chan struct{}) {
signaled := false
for basePeers := range substrate {
log.Printf("Propagate: got %d base peer(s)", len(basePeers))
raftPeers := []raft.Peer{}
for _, basePeer := range basePeers {
raftPeer, err := raft.NewHTTPPeer(basePeer.URL)
if err != nil {
log.Printf("Propagate: %s (OK=%v): %s", basePeer.URL, basePeer.OK, err)
continue
}
log.Printf("Propagate: %s is a valid Raft peer", basePeer.URL.String())
raftPeers = append(raftPeers, raftPeer)
}
if n := len(raftPeers); n > 0 {
if err := raftServer.SetConfiguration(raftPeers...); err != nil {
log.Printf("Propagate: SetConfiguration (%d): %s", n, err)
}
log.Printf("Propagate: SetConfiguration (%d) successful", n)
if n >= minimum && !signaled {
close(ready)
signaled = true
}
}
}
}
func ExampleNewServer_hTTP() {
// A no-op ApplyFunc
a := func(uint64, []byte) []byte { return []byte{} }
// Helper function to parse URLs
mustParseURL := func(rawurl string) *url.URL {
u, err := url.Parse(rawurl)
if err != nil {
panic(err)
}
u.Path = ""
return u
}
// Helper function to construct HTTP Peers
mustNewHTTPPeer := func(u *url.URL) raft.Peer {
p, err := raft.NewHTTPPeer(u)
if err != nil {
panic(err)
}
return p
}
// Construct the server
s := raft.NewServer(1, &bytes.Buffer{}, a)
// Expose the server using a HTTP transport
raft.HTTPTransport(http.DefaultServeMux, s)
go http.ListenAndServe(":8080", nil)
// Set the initial server configuration
s.SetConfiguration(
mustNewHTTPPeer(mustParseURL("http://127.0.0.1:8080")), // this server
mustNewHTTPPeer(mustParseURL("http://10.1.1.11:8080")),
mustNewHTTPPeer(mustParseURL("http://10.1.1.12:8080")),
mustNewHTTPPeer(mustParseURL("http://10.1.1.13:8080")),
mustNewHTTPPeer(mustParseURL("http://10.1.1.14:8080")),
)
// Start the server
s.Start()
}