230 lines
7.3 KiB
Go
230 lines
7.3 KiB
Go
package consul
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import (
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"runtime"
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"strconv"
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"github.com/hashicorp/consul/agent/metadata"
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"github.com/hashicorp/consul/agent/structs"
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"github.com/hashicorp/go-version"
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"github.com/hashicorp/serf/serf"
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)
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// CanServersUnderstandProtocol checks to see if all the servers in the given
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// list understand the given protocol version. If there are no servers in the
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// list then this will return false.
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func CanServersUnderstandProtocol(members []serf.Member, version uint8) (bool, error) {
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numServers, numWhoGrok := 0, 0
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for _, m := range members {
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if m.Tags["role"] != "consul" {
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continue
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}
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numServers++
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vsnMin, err := strconv.Atoi(m.Tags["vsn_min"])
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if err != nil {
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return false, err
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}
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vsnMax, err := strconv.Atoi(m.Tags["vsn_max"])
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if err != nil {
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return false, err
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}
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v := int(version)
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if (v >= vsnMin) && (v <= vsnMax) {
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numWhoGrok++
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}
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}
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return (numServers > 0) && (numWhoGrok == numServers), nil
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}
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// Returns if a member is a consul node. Returns a bool,
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// and the datacenter.
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func isConsulNode(m serf.Member) (bool, string) {
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if m.Tags["role"] != "node" {
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return false, ""
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}
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return true, m.Tags["dc"]
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}
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// runtimeStats is used to return various runtime information
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func runtimeStats() map[string]string {
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return map[string]string{
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"os": runtime.GOOS,
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"arch": runtime.GOARCH,
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"version": runtime.Version(),
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"max_procs": strconv.FormatInt(int64(runtime.GOMAXPROCS(0)), 10),
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"goroutines": strconv.FormatInt(int64(runtime.NumGoroutine()), 10),
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"cpu_count": strconv.FormatInt(int64(runtime.NumCPU()), 10),
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}
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}
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// checkServersProvider exists so that we can unit tests the requirements checking functions
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// without having to spin up a whole agent/server.
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type checkServersProvider interface {
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CheckServers(datacenter string, fn func(*metadata.Server) bool)
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}
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// serverRequirementsFn should inspect the given metadata.Server struct
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// and return two booleans. The first indicates whether the given requirements
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// are met. The second indicates whether this server should be considered filtered.
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//
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// The reason for the two booleans is so that a requirement function could "filter"
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// out the left server members if we only want to consider things which are still
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// around or likely to come back (failed state).
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type serverRequirementFn func(*metadata.Server) (ok bool, filtered bool)
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type serversMeetRequirementsState struct {
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// meetsRequirements is the callback to actual check for some specific requirement
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meetsRequirements serverRequirementFn
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// ok indicates whether all unfiltered servers meet the desired requirements
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ok bool
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// found is a boolean indicating that the meetsRequirement function accepted at
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// least one unfiltered server.
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found bool
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}
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func (s *serversMeetRequirementsState) update(srv *metadata.Server) bool {
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ok, filtered := s.meetsRequirements(srv)
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if filtered {
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// keep going but don't update any of the internal state as this server
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// was filtered by the requirements function
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return true
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}
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// mark that at least one server processed was not filtered
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s.found = true
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if !ok {
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// mark that at least one server does not meet the requirements
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s.ok = false
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// prevent continuing server evaluation
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return false
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}
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// this should already be set but this will prevent accidentally reusing
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// the state object from causing false-negatives.
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s.ok = true
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// continue evaluating servers
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return true
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}
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// ServersInDCMeetRequirements returns whether the given server members meet the requirements as defined by the
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// callback function and whether at least one server remains unfiltered by the requirements function.
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func ServersInDCMeetRequirements(provider checkServersProvider, datacenter string, meetsRequirements serverRequirementFn) (ok bool, found bool) {
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state := serversMeetRequirementsState{meetsRequirements: meetsRequirements, found: false, ok: true}
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provider.CheckServers(datacenter, state.update)
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return state.ok, state.found
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}
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// ServersInDCMeetMinimumVersion returns whether the given alive servers from a particular
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// datacenter are at least on the given Consul version. This also returns whether any
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// alive or failed servers are known in that datacenter (ignoring left and leaving ones)
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func ServersInDCMeetMinimumVersion(provider checkServersProvider, datacenter string, minVersion *version.Version) (ok bool, found bool) {
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return ServersInDCMeetRequirements(provider, datacenter, func(srv *metadata.Server) (bool, bool) {
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if srv.Status != serf.StatusAlive && srv.Status != serf.StatusFailed {
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// filter out the left servers as those should not be factored into our requirements
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return true, true
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}
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return !srv.Build.LessThan(minVersion), false
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})
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}
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// CheckServers implements the checkServersProvider interface for the Server
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func (s *Server) CheckServers(datacenter string, fn func(*metadata.Server) bool) {
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if datacenter == s.config.Datacenter {
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// use the ServerLookup type for the local DC
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s.serverLookup.CheckServers(fn)
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} else {
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// use the router for all non-local DCs
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s.router.CheckServers(datacenter, fn)
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}
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}
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// CheckServers implements the checkServersProvider interface for the Client
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func (c *Client) CheckServers(datacenter string, fn func(*metadata.Server) bool) {
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if datacenter != c.config.Datacenter {
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return
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}
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c.router.CheckServers(datacenter, fn)
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}
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type serversACLMode struct {
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// leader is the address of the leader
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leader string
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// mode indicates the overall ACL mode of the servers
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mode structs.ACLMode
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// leaderMode is the ACL mode of the leader server
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leaderMode structs.ACLMode
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// indicates that at least one server was processed
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found bool
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}
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func (s *serversACLMode) init(leader string) {
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s.leader = leader
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s.mode = structs.ACLModeEnabled
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s.leaderMode = structs.ACLModeUnknown
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s.found = false
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}
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func (s *serversACLMode) update(srv *metadata.Server) bool {
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if srv.Status != serf.StatusAlive && srv.Status != serf.StatusFailed {
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// they are left or something so regardless we treat these servers as meeting
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// the version requirement
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return true
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}
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// mark that we processed at least one server
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s.found = true
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if srvAddr := srv.Addr.String(); srvAddr == s.leader {
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s.leaderMode = srv.ACLs
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}
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switch srv.ACLs {
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case structs.ACLModeDisabled:
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// anything disabled means we cant enable ACLs
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s.mode = structs.ACLModeDisabled
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case structs.ACLModeEnabled:
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// do nothing
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case structs.ACLModeLegacy:
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// This covers legacy mode and older server versions that don't advertise ACL support
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if s.mode != structs.ACLModeDisabled && s.mode != structs.ACLModeUnknown {
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s.mode = structs.ACLModeLegacy
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}
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default:
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if s.mode != structs.ACLModeDisabled {
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s.mode = structs.ACLModeUnknown
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}
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}
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return true
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}
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// ServersGetACLMode checks all the servers in a particular datacenter and determines
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// what the minimum ACL mode amongst them is and what the leaders ACL mode is.
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// The "found" return value indicates whether there were any servers considered in
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// this datacenter. If that is false then the other mode return values are meaningless
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// as they will be ACLModeEnabled and ACLModeUnkown respectively.
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func ServersGetACLMode(provider checkServersProvider, leaderAddr string, datacenter string) (found bool, mode structs.ACLMode, leaderMode structs.ACLMode) {
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var state serversACLMode
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state.init(leaderAddr)
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provider.CheckServers(datacenter, state.update)
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return state.found, state.mode, state.leaderMode
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}
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