open-consul/agent/consul/coordinate_endpoint.go

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package consul
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import (
"fmt"
"strings"
"sync"
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"time"
"github.com/hashicorp/consul/acl"
pkg refactor command/agent/* -> agent/* command/consul/* -> agent/consul/* command/agent/command{,_test}.go -> command/agent{,_test}.go command/base/command.go -> command/base.go command/base/* -> command/* commands.go -> command/commands.go The script which did the refactor is: ( cd $GOPATH/src/github.com/hashicorp/consul git mv command/agent/command.go command/agent.go git mv command/agent/command_test.go command/agent_test.go git mv command/agent/flag_slice_value{,_test}.go command/ git mv command/agent . git mv command/base/command.go command/base.go git mv command/base/config_util{,_test}.go command/ git mv commands.go command/ git mv consul agent rmdir command/base/ gsed -i -e 's|package agent|package command|' command/agent{,_test}.go gsed -i -e 's|package agent|package command|' command/flag_slice_value{,_test}.go gsed -i -e 's|package base|package command|' command/base.go command/config_util{,_test}.go gsed -i -e 's|package main|package command|' command/commands.go gsed -i -e 's|base.Command|BaseCommand|' command/commands.go gsed -i -e 's|agent.Command|AgentCommand|' command/commands.go gsed -i -e 's|\tCommand:|\tBaseCommand:|' command/commands.go gsed -i -e 's|base\.||' command/commands.go gsed -i -e 's|command\.||' command/commands.go gsed -i -e 's|command|c|' main.go gsed -i -e 's|range Commands|range command.Commands|' main.go gsed -i -e 's|Commands: Commands|Commands: command.Commands|' main.go gsed -i -e 's|base\.BoolValue|BoolValue|' command/operator_autopilot_set.go gsed -i -e 's|base\.DurationValue|DurationValue|' command/operator_autopilot_set.go gsed -i -e 's|base\.StringValue|StringValue|' command/operator_autopilot_set.go gsed -i -e 's|base\.UintValue|UintValue|' command/operator_autopilot_set.go gsed -i -e 's|\bCommand\b|BaseCommand|' command/base.go gsed -i -e 's|BaseCommand Options|Command Options|' command/base.go gsed -i -e 's|base.Command|BaseCommand|' command/*.go gsed -i -e 's|c\.Command|c.BaseCommand|g' command/*.go gsed -i -e 's|\tCommand:|\tBaseCommand:|' command/*_test.go gsed -i -e 's|base\.||' command/*_test.go gsed -i -e 's|\bCommand\b|AgentCommand|' command/agent{,_test}.go gsed -i -e 's|cmd.AgentCommand|cmd.BaseCommand|' command/agent.go gsed -i -e 's|cli.AgentCommand = new(Command)|cli.Command = new(AgentCommand)|' command/agent_test.go gsed -i -e 's|exec.AgentCommand|exec.Command|' command/agent_test.go gsed -i -e 's|exec.BaseCommand|exec.Command|' command/agent_test.go gsed -i -e 's|NewTestAgent|agent.NewTestAgent|' command/agent_test.go gsed -i -e 's|= TestConfig|= agent.TestConfig|' command/agent_test.go gsed -i -e 's|: RetryJoin|: agent.RetryJoin|' command/agent_test.go gsed -i -e 's|\.\./\.\./|../|' command/config_util_test.go gsed -i -e 's|\bverifyUniqueListeners|VerifyUniqueListeners|' agent/config{,_test}.go command/agent.go gsed -i -e 's|\bserfLANKeyring\b|SerfLANKeyring|g' agent/{agent,keyring,testagent}.go command/agent.go gsed -i -e 's|\bserfWANKeyring\b|SerfWANKeyring|g' agent/{agent,keyring,testagent}.go command/agent.go gsed -i -e 's|\bNewAgent\b|agent.New|g' command/agent{,_test}.go gsed -i -e 's|\bNewAgent|New|' agent/{acl_test,agent,testagent}.go gsed -i -e 's|\bAgent\b|agent.&|g' command/agent{,_test}.go gsed -i -e 's|\bBool\b|agent.&|g' command/agent{,_test}.go gsed -i -e 's|\bConfig\b|agent.&|g' command/agent{,_test}.go gsed -i -e 's|\bDefaultConfig\b|agent.&|g' command/agent{,_test}.go gsed -i -e 's|\bDevConfig\b|agent.&|g' command/agent{,_test}.go gsed -i -e 's|\bMergeConfig\b|agent.&|g' command/agent{,_test}.go gsed -i -e 's|\bReadConfigPaths\b|agent.&|g' command/agent{,_test}.go gsed -i -e 's|\bParseMetaPair\b|agent.&|g' command/agent{,_test}.go gsed -i -e 's|\bSerfLANKeyring\b|agent.&|g' command/agent{,_test}.go gsed -i -e 's|\bSerfWANKeyring\b|agent.&|g' command/agent{,_test}.go gsed -i -e 's|circonus\.agent|circonus|g' command/agent{,_test}.go gsed -i -e 's|logger\.agent|logger|g' command/agent{,_test}.go gsed -i -e 's|metrics\.agent|metrics|g' command/agent{,_test}.go gsed -i -e 's|// agent.Agent|// agent|' command/agent{,_test}.go gsed -i -e 's|a\.agent\.Config|a.Config|' command/agent{,_test}.go gsed -i -e 's|agent\.AppendSliceValue|AppendSliceValue|' command/{configtest,validate}.go gsed -i -e 's|consul/consul|agent/consul|' GNUmakefile gsed -i -e 's|\.\./test|../../test|' agent/consul/server_test.go # fix imports f=$(grep -rl 'github.com/hashicorp/consul/command/agent' * | grep '\.go') gsed -i -e 's|github.com/hashicorp/consul/command/agent|github.com/hashicorp/consul/agent|' $f goimports -w $f f=$(grep -rl 'github.com/hashicorp/consul/consul' * | grep '\.go') gsed -i -e 's|github.com/hashicorp/consul/consul|github.com/hashicorp/consul/agent/consul|' $f goimports -w $f goimports -w command/*.go main.go )
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"github.com/hashicorp/consul/agent/consul/state"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/logging"
"github.com/hashicorp/go-hclog"
"github.com/hashicorp/go-memdb"
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)
// Coordinate manages queries and updates for network coordinates.
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type Coordinate struct {
// srv is a pointer back to the server.
srv *Server
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logger hclog.Logger
// updates holds pending coordinate updates for the given nodes. This is
// keyed by node:segment so we can get a coordinate for each segment for
// servers, and we only track the latest update per node:segment.
updates map[string]*structs.CoordinateUpdateRequest
// updatesLock synchronizes access to the updates map.
updatesLock sync.Mutex
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}
// NewCoordinate returns a new Coordinate endpoint.
func NewCoordinate(srv *Server, logger hclog.Logger) *Coordinate {
c := &Coordinate{
srv: srv,
logger: logger.Named(logging.Coordinate),
updates: make(map[string]*structs.CoordinateUpdateRequest),
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}
go c.batchUpdate()
return c
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}
// batchUpdate is a long-running routine that flushes pending coordinates to the
// Raft log in batches.
func (c *Coordinate) batchUpdate() {
for {
select {
case <-time.After(c.srv.config.CoordinateUpdatePeriod):
if err := c.batchApplyUpdates(); err != nil {
c.logger.Warn("Batch update failed", "error", err)
}
case <-c.srv.shutdownCh:
return
}
}
}
// batchApplyUpdates applies all pending updates to the Raft log in a series of
// batches.
func (c *Coordinate) batchApplyUpdates() error {
// Grab the pending updates and release the lock so we can still handle
// incoming messages.
c.updatesLock.Lock()
pending := c.updates
c.updates = make(map[string]*structs.CoordinateUpdateRequest)
c.updatesLock.Unlock()
// Enforce the rate limit.
limit := c.srv.config.CoordinateUpdateBatchSize * c.srv.config.CoordinateUpdateMaxBatches
size := len(pending)
if size > limit {
c.logger.Warn("Discarded coordinate updates", "number_discarded", size-limit)
size = limit
}
// Transform the map into a slice that we can feed to the Raft log in
// batches.
i := 0
updates := make(structs.Coordinates, size)
for _, update := range pending {
if !(i < size) {
break
}
updates[i] = &structs.Coordinate{
Node: update.Node,
Segment: update.Segment,
Coord: update.Coord,
}
i++
}
// Apply the updates to the Raft log in batches.
for start := 0; start < size; start += c.srv.config.CoordinateUpdateBatchSize {
end := start + c.srv.config.CoordinateUpdateBatchSize
if end > size {
end = size
}
// We set the "safe to ignore" flag on this update type so old
// servers don't crash if they see one of these.
t := structs.CoordinateBatchUpdateType | structs.IgnoreUnknownTypeFlag
slice := updates[start:end]
resp, err := c.srv.raftApply(t, slice)
if err != nil {
return err
}
if respErr, ok := resp.(error); ok {
return respErr
}
}
return nil
}
// Update inserts or updates the LAN coordinate of a node.
func (c *Coordinate) Update(args *structs.CoordinateUpdateRequest, reply *struct{}) (err error) {
if done, err := c.srv.ForwardRPC("Coordinate.Update", args, args, reply); done {
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return err
}
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// Older clients can send coordinates with invalid numeric values like
// NaN and Inf. We guard against these coming in, though newer clients
// should never send these.
if !args.Coord.IsValid() {
return fmt.Errorf("invalid coordinate")
}
// Since this is a coordinate coming from some place else we harden this
// and look for dimensionality problems proactively.
coord, err := c.srv.serfLAN.GetCoordinate()
if err != nil {
return err
}
if !coord.IsCompatibleWith(args.Coord) {
return fmt.Errorf("incompatible coordinate")
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}
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// Fetch the ACL token, if any, and enforce the node policy if enabled.
authz, err := c.srv.ResolveToken(args.Token)
if err != nil {
return err
}
if authz != nil {
var authzContext acl.AuthorizerContext
structs.DefaultEnterpriseMeta().FillAuthzContext(&authzContext)
if authz.NodeWrite(args.Node, &authzContext) != acl.Allow {
return acl.ErrPermissionDenied
}
}
// Add the coordinate to the map of pending updates.
key := fmt.Sprintf("%s:%s", args.Node, args.Segment)
c.updatesLock.Lock()
c.updates[key] = args
c.updatesLock.Unlock()
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return nil
}
// ListDatacenters returns the list of datacenters and their respective nodes
// and the raw coordinates of those nodes (if no coordinates are available for
// any of the nodes, the node list may be empty).
func (c *Coordinate) ListDatacenters(args *struct{}, reply *[]structs.DatacenterMap) error {
maps, err := c.srv.router.GetDatacenterMaps()
if err != nil {
return err
}
// Strip the datacenter suffixes from all the node names.
for i := range maps {
suffix := fmt.Sprintf(".%s", maps[i].Datacenter)
for j := range maps[i].Coordinates {
node := maps[i].Coordinates[j].Node
maps[i].Coordinates[j].Node = strings.TrimSuffix(node, suffix)
}
}
*reply = maps
return nil
}
// ListNodes returns the list of nodes with their raw network coordinates (if no
// coordinates are available for a node it won't appear in this list).
func (c *Coordinate) ListNodes(args *structs.DCSpecificRequest, reply *structs.IndexedCoordinates) error {
if done, err := c.srv.ForwardRPC("Coordinate.ListNodes", args, args, reply); done {
return err
}
return c.srv.blockingQuery(&args.QueryOptions,
&reply.QueryMeta,
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func(ws memdb.WatchSet, state *state.Store) error {
index, coords, err := state.Coordinates(ws)
if err != nil {
return err
}
reply.Index, reply.Coordinates = index, coords
if err := c.srv.filterACL(args.Token, reply); err != nil {
return err
}
return nil
})
}
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// Node returns the raw coordinates for a single node.
func (c *Coordinate) Node(args *structs.NodeSpecificRequest, reply *structs.IndexedCoordinates) error {
if done, err := c.srv.ForwardRPC("Coordinate.Node", args, args, reply); done {
return err
}
// Fetch the ACL token, if any, and enforce the node policy if enabled.
authz, err := c.srv.ResolveToken(args.Token)
if err != nil {
return err
}
if authz != nil {
var authzContext acl.AuthorizerContext
structs.WildcardEnterpriseMeta().FillAuthzContext(&authzContext)
if authz.NodeRead(args.Node, &authzContext) != acl.Allow {
return acl.ErrPermissionDenied
}
}
return c.srv.blockingQuery(&args.QueryOptions,
&reply.QueryMeta,
func(ws memdb.WatchSet, state *state.Store) error {
index, nodeCoords, err := state.Coordinate(args.Node, ws)
if err != nil {
return err
}
var coords structs.Coordinates
for segment, coord := range nodeCoords {
coords = append(coords, &structs.Coordinate{
Node: args.Node,
Segment: segment,
Coord: coord,
})
}
reply.Index, reply.Coordinates = index, coords
return nil
})
}