932 lines
26 KiB
Go
932 lines
26 KiB
Go
package structs
|
|
|
|
import (
|
|
"fmt"
|
|
"math"
|
|
"sort"
|
|
"time"
|
|
|
|
"github.com/hashicorp/consul/acl"
|
|
)
|
|
|
|
// ServiceRouterConfigEntry defines L7 (e.g. http) routing rules for a named
|
|
// service exposed in Connect.
|
|
//
|
|
// This config entry represents the topmost part of the discovery chain. Only
|
|
// one router config will be used per resolved discovery chain and is not
|
|
// otherwise discovered recursively (unlike splitter and resolver config
|
|
// entries).
|
|
//
|
|
// Router config entries will be restricted to only services that define their
|
|
// protocol as http-based (in centralized configuration).
|
|
type ServiceRouterConfigEntry struct {
|
|
Kind string
|
|
Name string
|
|
|
|
// Routes is the list of routes to consider when processing L7 requests.
|
|
// The first rule to match in the list is terminal and stops further
|
|
// evaluation.
|
|
//
|
|
// Traffic that fails to match any of the provided routes will be routed to
|
|
// the default service.
|
|
Routes []ServiceRoute
|
|
|
|
RaftIndex
|
|
}
|
|
|
|
func (e *ServiceRouterConfigEntry) GetKind() string {
|
|
return ServiceRouter
|
|
}
|
|
|
|
func (e *ServiceRouterConfigEntry) GetName() string {
|
|
if e == nil {
|
|
return ""
|
|
}
|
|
|
|
return e.Name
|
|
}
|
|
|
|
func (e *ServiceRouterConfigEntry) Normalize() error {
|
|
if e == nil {
|
|
return fmt.Errorf("config entry is nil")
|
|
}
|
|
|
|
// TODO(rb): trim spaces
|
|
|
|
e.Kind = ServiceRouter
|
|
|
|
// TODO(rb): anything to normalize?
|
|
|
|
return nil
|
|
}
|
|
|
|
func (e *ServiceRouterConfigEntry) Validate() error {
|
|
if e.Name == "" {
|
|
return fmt.Errorf("Name is required")
|
|
}
|
|
|
|
// TODO(rb): enforce corresponding service has protocol=http
|
|
|
|
// TODO(rb): actually you can only define the HTTP section if protocol=http{,2}
|
|
|
|
// TODO(rb): validate the entire compiled chain? how?
|
|
|
|
// TODO(rb): validate more
|
|
|
|
// Technically you can have no explicit routes at all where just the
|
|
// catch-all is configured for you, but at that point maybe you should just
|
|
// delete it so it will default?
|
|
|
|
for i, route := range e.Routes {
|
|
if route.Match == nil || route.Match.HTTP == nil {
|
|
continue
|
|
}
|
|
|
|
pathParts := 0
|
|
if route.Match.HTTP.PathExact != "" {
|
|
pathParts++
|
|
}
|
|
if route.Match.HTTP.PathPrefix != "" {
|
|
pathParts++
|
|
}
|
|
if route.Match.HTTP.PathRegex != "" {
|
|
pathParts++
|
|
}
|
|
if pathParts > 1 {
|
|
return fmt.Errorf("Route[%d] should only contain at most one of PathExact, PathPrefix, or PathRegex", i)
|
|
}
|
|
|
|
for j, hdr := range route.Match.HTTP.Header {
|
|
if hdr.Name == "" {
|
|
return fmt.Errorf("Route[%d] Header[%d] missing required Name field", i, j)
|
|
}
|
|
hdrParts := 0
|
|
if hdr.Present {
|
|
hdrParts++
|
|
}
|
|
if hdr.Exact != "" {
|
|
hdrParts++
|
|
}
|
|
if hdr.Regex != "" {
|
|
hdrParts++
|
|
}
|
|
if hdr.Prefix != "" {
|
|
hdrParts++
|
|
}
|
|
if hdr.Suffix != "" {
|
|
hdrParts++
|
|
}
|
|
// "absent" is the bare invert=true
|
|
if (hdrParts == 0 && !hdr.Invert) || (hdrParts > 1) {
|
|
return fmt.Errorf("Route[%d] Header[%d] should only contain one of Present, Exact, Prefix, Suffix, or Regex (or just Invert)", i, j)
|
|
}
|
|
}
|
|
|
|
for j, qm := range route.Match.HTTP.QueryParam {
|
|
if qm.Name == "" {
|
|
return fmt.Errorf("Route[%d] QueryParam[%d] missing required Name field", i, j)
|
|
}
|
|
}
|
|
|
|
ineligibleForPrefixRewrite := false
|
|
if route.Match.HTTP.PathRegex != "" {
|
|
ineligibleForPrefixRewrite = true
|
|
}
|
|
|
|
if route.Destination != nil {
|
|
if route.Destination.PrefixRewrite != "" && ineligibleForPrefixRewrite {
|
|
return fmt.Errorf("Route[%d] cannot make use of PrefixRewrite without configuring either PathExact or PathPrefix", i)
|
|
}
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (e *ServiceRouterConfigEntry) CanRead(rule acl.Authorizer) bool {
|
|
return canReadDiscoveryChain(e, rule)
|
|
}
|
|
|
|
func (e *ServiceRouterConfigEntry) CanWrite(rule acl.Authorizer) bool {
|
|
return canWriteDiscoveryChain(e, rule)
|
|
}
|
|
|
|
func (e *ServiceRouterConfigEntry) GetRaftIndex() *RaftIndex {
|
|
if e == nil {
|
|
return &RaftIndex{}
|
|
}
|
|
|
|
return &e.RaftIndex
|
|
}
|
|
|
|
func (e *ServiceRouterConfigEntry) ListRelatedServices() []string {
|
|
found := make(map[string]struct{})
|
|
|
|
// We always inject a default catch-all route to the same service as the router.
|
|
found[e.Name] = struct{}{}
|
|
|
|
for _, route := range e.Routes {
|
|
if route.Destination != nil && route.Destination.Service != "" {
|
|
found[route.Destination.Service] = struct{}{}
|
|
}
|
|
}
|
|
|
|
out := make([]string, 0, len(found))
|
|
for svc, _ := range found {
|
|
out = append(out, svc)
|
|
}
|
|
sort.Strings(out)
|
|
return out
|
|
}
|
|
|
|
// ServiceRoute is a single routing rule that routes traffic to the destination
|
|
// when the match criteria applies.
|
|
type ServiceRoute struct {
|
|
Match *ServiceRouteMatch `json:",omitempty"`
|
|
Destination *ServiceRouteDestination `json:",omitempty"`
|
|
}
|
|
|
|
// ServiceRouteMatch is a set of criteria that can match incoming L7 requests.
|
|
type ServiceRouteMatch struct {
|
|
HTTP *ServiceRouteHTTPMatch `json:",omitempty"`
|
|
|
|
// If we have non-http match criteria for other protocols in the future
|
|
// (gRPC, redis, etc) they can go here.
|
|
}
|
|
|
|
func (m *ServiceRouteMatch) IsEmpty() bool {
|
|
return m.HTTP == nil || m.HTTP.IsEmpty()
|
|
}
|
|
|
|
// ServiceRouteHTTPMatch is a set of http-specific match criteria.
|
|
type ServiceRouteHTTPMatch struct {
|
|
PathExact string `json:",omitempty"`
|
|
PathPrefix string `json:",omitempty"`
|
|
PathRegex string `json:",omitempty"`
|
|
|
|
Header []ServiceRouteHTTPMatchHeader `json:",omitempty"`
|
|
QueryParam []ServiceRouteHTTPMatchQueryParam `json:",omitempty"`
|
|
|
|
// TODO(rb): reenable Methods
|
|
// Methods []string `json:",omitempty"`
|
|
}
|
|
|
|
func (m *ServiceRouteHTTPMatch) IsEmpty() bool {
|
|
return m.PathExact == "" &&
|
|
m.PathPrefix == "" &&
|
|
m.PathRegex == "" &&
|
|
len(m.Header) == 0 &&
|
|
len(m.QueryParam) == 0
|
|
// && len(m.Methods) == 0
|
|
}
|
|
|
|
type ServiceRouteHTTPMatchHeader struct {
|
|
Name string
|
|
Present bool `json:",omitempty"`
|
|
Exact string `json:",omitempty"`
|
|
Prefix string `json:",omitempty"`
|
|
Suffix string `json:",omitempty"`
|
|
Regex string `json:",omitempty"`
|
|
Invert bool `json:",omitempty"`
|
|
}
|
|
|
|
type ServiceRouteHTTPMatchQueryParam struct {
|
|
Name string
|
|
Value string `json:",omitempty"`
|
|
Regex bool `json:",omitempty"`
|
|
}
|
|
|
|
// ServiceRouteDestination describes how to proxy the actual matching request
|
|
// to a service.
|
|
type ServiceRouteDestination struct {
|
|
// Service is the service to resolve instead of the default service. If
|
|
// empty then the default discovery chain service name is used.
|
|
Service string `json:",omitempty"`
|
|
|
|
// ServiceSubset is a named subset of the given service to resolve instead
|
|
// of one defined as that service's DefaultSubset. If empty the default
|
|
// subset is used.
|
|
//
|
|
// If this field is specified then this route is ineligible for further
|
|
// splitting.
|
|
ServiceSubset string `json:",omitempty"`
|
|
|
|
// Namespace is the namespace to resolve the service from instead of the
|
|
// current namespace. If empty the current namespace is assumed.
|
|
//
|
|
// If this field is specified then this route is ineligible for further
|
|
// splitting.
|
|
Namespace string `json:",omitempty"`
|
|
|
|
// PrefixRewrite allows for the proxied request to have its matching path
|
|
// prefix modified before being sent to the destination. Described more
|
|
// below in the envoy implementation section.
|
|
PrefixRewrite string `json:",omitempty"`
|
|
|
|
// RequestTimeout is the total amount of time permitted for the entire
|
|
// downstream request (and retries) to be processed.
|
|
RequestTimeout time.Duration `json:",omitempty"`
|
|
|
|
// NumRetries is the number of times to retry the request when a retryable
|
|
// result occurs. This seems fairly proxy agnostic.
|
|
NumRetries uint32 `json:",omitempty"`
|
|
|
|
// RetryOnConnectFailure allows for connection failure errors to trigger a
|
|
// retry. This should be expressible in other proxies as it's just a layer
|
|
// 4 failure bubbling up to layer 7.
|
|
RetryOnConnectFailure bool `json:",omitempty"`
|
|
|
|
// RetryOnStatusCodes is a flat list of http response status codes that are
|
|
// eligible for retry. This again should be feasible in any sane proxy.
|
|
RetryOnStatusCodes []uint32 `json:",omitempty"`
|
|
}
|
|
|
|
// ServiceSplitterConfigEntry defines how incoming requests are split across
|
|
// different subsets of a single service (like during staged canary rollouts),
|
|
// or perhaps across different services (like during a v2 rewrite or other type
|
|
// of codebase migration).
|
|
//
|
|
// This config entry represents the next hop of the discovery chain after
|
|
// routing. If no splitter config is defined the chain assumes 100% of traffic
|
|
// goes to the default service and discovery continues on to the resolution
|
|
// hop.
|
|
//
|
|
// Splitter configs are recursively collected while walking the discovery
|
|
// chain.
|
|
//
|
|
// Splitter config entries will be restricted to only services that define
|
|
// their protocol as http-based (in centralized configuration).
|
|
type ServiceSplitterConfigEntry struct {
|
|
Kind string
|
|
Name string
|
|
|
|
// Splits is the configurations for the details of the traffic splitting.
|
|
//
|
|
// The sum of weights across all splits must add up to 100.
|
|
//
|
|
// If the split is within epsilon of 100 then the remainder is attributed
|
|
// to the FIRST split.
|
|
Splits []ServiceSplit
|
|
|
|
RaftIndex
|
|
}
|
|
|
|
func (e *ServiceSplitterConfigEntry) GetKind() string {
|
|
return ServiceSplitter
|
|
}
|
|
|
|
func (e *ServiceSplitterConfigEntry) GetName() string {
|
|
if e == nil {
|
|
return ""
|
|
}
|
|
|
|
return e.Name
|
|
}
|
|
|
|
func (e *ServiceSplitterConfigEntry) Normalize() error {
|
|
if e == nil {
|
|
return fmt.Errorf("config entry is nil")
|
|
}
|
|
// TODO(rb): trim spaces
|
|
|
|
e.Kind = ServiceSplitter
|
|
|
|
// This slightly massages inputs to enforce that the smallest representable
|
|
// weight is 1/10000 or .01%
|
|
|
|
if len(e.Splits) > 0 {
|
|
for i, split := range e.Splits {
|
|
e.Splits[i].Weight = NormalizeServiceSplitWeight(split.Weight)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func NormalizeServiceSplitWeight(weight float32) float32 {
|
|
weightScaled := scaleWeight(weight)
|
|
return float32(float32(weightScaled) / 100.0)
|
|
}
|
|
|
|
func (e *ServiceSplitterConfigEntry) Validate() error {
|
|
if e.Name == "" {
|
|
return fmt.Errorf("Name is required")
|
|
}
|
|
|
|
if len(e.Splits) == 0 {
|
|
return fmt.Errorf("no splits configured")
|
|
}
|
|
|
|
const maxScaledWeight = 100 * 100
|
|
|
|
copyAsKey := func(s ServiceSplit) ServiceSplit {
|
|
s.Weight = 0
|
|
return s
|
|
}
|
|
|
|
// Make sure we didn't refer to the same thing twice.
|
|
found := make(map[ServiceSplit]struct{})
|
|
for _, split := range e.Splits {
|
|
splitKey := copyAsKey(split)
|
|
if splitKey.Service == "" {
|
|
splitKey.Service = e.Name
|
|
}
|
|
if _, ok := found[splitKey]; ok {
|
|
return fmt.Errorf(
|
|
"split destination occurs more than once: service=%q, subset=%q, namespace=%q",
|
|
splitKey.Service, splitKey.ServiceSubset, splitKey.Namespace,
|
|
)
|
|
}
|
|
found[splitKey] = struct{}{}
|
|
}
|
|
|
|
sumScaled := 0
|
|
for _, split := range e.Splits {
|
|
sumScaled += scaleWeight(split.Weight)
|
|
}
|
|
|
|
if sumScaled != maxScaledWeight {
|
|
return fmt.Errorf("the sum of all split weights must be 100, not %f", float32(sumScaled)/100)
|
|
}
|
|
|
|
// TODO(rb): enforce corresponding service has protocol=http
|
|
|
|
// TODO(rb): validate the entire compiled chain? how?
|
|
|
|
return nil
|
|
}
|
|
|
|
// scaleWeight assumes the input is a value between 0 and 100 representing
|
|
// shares out of a percentile range. The function will convert to a unit
|
|
// representing 0.01% units in the same manner as you may convert $0.98 to 98
|
|
// cents.
|
|
func scaleWeight(v float32) int {
|
|
return int(math.Round(float64(v * 100.0)))
|
|
}
|
|
|
|
func (e *ServiceSplitterConfigEntry) CanRead(rule acl.Authorizer) bool {
|
|
return canReadDiscoveryChain(e, rule)
|
|
}
|
|
|
|
func (e *ServiceSplitterConfigEntry) CanWrite(rule acl.Authorizer) bool {
|
|
return canWriteDiscoveryChain(e, rule)
|
|
}
|
|
|
|
func (e *ServiceSplitterConfigEntry) GetRaftIndex() *RaftIndex {
|
|
if e == nil {
|
|
return &RaftIndex{}
|
|
}
|
|
|
|
return &e.RaftIndex
|
|
}
|
|
|
|
func (e *ServiceSplitterConfigEntry) ListRelatedServices() []string {
|
|
found := make(map[string]struct{})
|
|
|
|
for _, split := range e.Splits {
|
|
if split.Service != "" {
|
|
found[split.Service] = struct{}{}
|
|
}
|
|
}
|
|
|
|
out := make([]string, 0, len(found))
|
|
for svc, _ := range found {
|
|
out = append(out, svc)
|
|
}
|
|
sort.Strings(out)
|
|
return out
|
|
}
|
|
|
|
// ServiceSplit defines how much traffic to send to which set of service
|
|
// instances during a traffic split.
|
|
type ServiceSplit struct {
|
|
// A value between 0 and 100 reflecting what portion of traffic should be
|
|
// directed to this split.
|
|
//
|
|
// The smallest representable weight is 1/10000 or .01%
|
|
//
|
|
// If the split is within epsilon of 100 then the remainder is attributed
|
|
// to the FIRST split.
|
|
Weight float32
|
|
|
|
// Service is the service to resolve instead of the default (optional).
|
|
Service string `json:",omitempty"`
|
|
|
|
// ServiceSubset is a named subset of the given service to resolve instead
|
|
// of one defined as that service's DefaultSubset. If empty the default
|
|
// subset is used (optional).
|
|
//
|
|
// If this field is specified then this route is ineligible for further
|
|
// splitting.
|
|
ServiceSubset string `json:",omitempty"`
|
|
|
|
// Namespace is the namespace to resolve the service from instead of the
|
|
// current namespace. If empty the current namespace is assumed (optional).
|
|
//
|
|
// If this field is specified then this route is ineligible for further
|
|
// splitting.
|
|
Namespace string `json:",omitempty"`
|
|
}
|
|
|
|
// ServiceResolverConfigEntry defines which instances of a service should
|
|
// satisfy discovery requests for a given named service.
|
|
//
|
|
// This config entry represents the next hop of the discovery chain after
|
|
// splitting. If no resolver config is defined the chain assumes 100% of
|
|
// traffic goes to the healthy instances of the default service in the current
|
|
// datacenter+namespace and discovery terminates.
|
|
//
|
|
// Resolver configs are recursively collected while walking the chain.
|
|
//
|
|
// Resolver config entries will be valid for services defined with any protocol
|
|
// (in centralized configuration).
|
|
type ServiceResolverConfigEntry struct {
|
|
Kind string
|
|
Name string
|
|
|
|
// DefaultSubset is the subset to use when no explicit subset is
|
|
// requested. If empty the unnamed subset is used.
|
|
DefaultSubset string `json:",omitempty"`
|
|
|
|
// Subsets is a map of subset name to subset definition for all
|
|
// usable named subsets of this service. The map key is the name
|
|
// of the subset and all names must be valid DNS subdomain elements
|
|
// so they can be used in SNI FQDN headers for the Connect Gateways
|
|
// feature.
|
|
//
|
|
// This may be empty, in which case only the unnamed default subset
|
|
// will be usable.
|
|
Subsets map[string]ServiceResolverSubset `json:",omitempty"`
|
|
|
|
// Redirect is a service/subset/datacenter/namespace to resolve
|
|
// instead of the requested service (optional).
|
|
//
|
|
// When configured, all occurrences of this resolver in any discovery
|
|
// chain evaluation will be substituted for the supplied redirect
|
|
// EXCEPT when the redirect has already been applied.
|
|
//
|
|
// When substituting the supplied redirect into the discovery chain
|
|
// all other fields beside Kind/Name/Redirect will be ignored.
|
|
Redirect *ServiceResolverRedirect `json:",omitempty"`
|
|
|
|
// Failover controls when and how to reroute traffic to an alternate pool
|
|
// of service instances.
|
|
//
|
|
// The map is keyed by the service subset it applies to, and the special
|
|
// string "*" is a wildcard that applies to any subset not otherwise
|
|
// specified here.
|
|
Failover map[string]ServiceResolverFailover `json:",omitempty"`
|
|
|
|
// ConnectTimeout is the timeout for establishing new network connections
|
|
// to this service.
|
|
ConnectTimeout time.Duration `json:",omitempty"`
|
|
|
|
RaftIndex
|
|
}
|
|
|
|
func (e *ServiceResolverConfigEntry) SubsetExists(name string) bool {
|
|
if name == "" {
|
|
return true
|
|
}
|
|
if len(e.Subsets) == 0 {
|
|
return false
|
|
}
|
|
_, ok := e.Subsets[name]
|
|
return ok
|
|
}
|
|
|
|
func (e *ServiceResolverConfigEntry) IsDefault() bool {
|
|
return e.DefaultSubset == "" &&
|
|
len(e.Subsets) == 0 &&
|
|
e.Redirect == nil &&
|
|
len(e.Failover) == 0 &&
|
|
e.ConnectTimeout == 0
|
|
}
|
|
|
|
func (e *ServiceResolverConfigEntry) GetKind() string {
|
|
return ServiceResolver
|
|
}
|
|
|
|
func (e *ServiceResolverConfigEntry) GetName() string {
|
|
if e == nil {
|
|
return ""
|
|
}
|
|
|
|
return e.Name
|
|
}
|
|
|
|
func (e *ServiceResolverConfigEntry) Normalize() error {
|
|
if e == nil {
|
|
return fmt.Errorf("config entry is nil")
|
|
}
|
|
// TODO(rb): trim spaces
|
|
|
|
e.Kind = ServiceResolver
|
|
|
|
// TODO(rb): anything to normalize?
|
|
|
|
return nil
|
|
}
|
|
|
|
func (e *ServiceResolverConfigEntry) Validate() error {
|
|
if e.Name == "" {
|
|
return fmt.Errorf("Name is required")
|
|
}
|
|
|
|
if len(e.Subsets) > 0 {
|
|
for name, _ := range e.Subsets {
|
|
if name == "" {
|
|
return fmt.Errorf("Subset defined with empty name")
|
|
}
|
|
}
|
|
}
|
|
|
|
isSubset := func(subset string) bool {
|
|
if len(e.Subsets) > 0 {
|
|
_, ok := e.Subsets[subset]
|
|
return ok
|
|
}
|
|
return false
|
|
}
|
|
|
|
if e.DefaultSubset != "" && !isSubset(e.DefaultSubset) {
|
|
return fmt.Errorf("DefaultSubset %q is not a valid subset", e.DefaultSubset)
|
|
}
|
|
|
|
if e.Redirect != nil {
|
|
r := e.Redirect
|
|
|
|
if len(e.Failover) > 0 {
|
|
return fmt.Errorf("Redirect and Failover cannot both be set")
|
|
}
|
|
|
|
// TODO(rb): prevent subsets and default subsets from being defined?
|
|
|
|
if r.Service == "" && r.ServiceSubset == "" && r.Namespace == "" && r.Datacenter == "" {
|
|
return fmt.Errorf("Redirect is empty")
|
|
}
|
|
|
|
if r.Service == "" {
|
|
if r.ServiceSubset != "" {
|
|
return fmt.Errorf("Redirect.ServiceSubset defined without Redirect.Service")
|
|
}
|
|
if r.Namespace != "" {
|
|
return fmt.Errorf("Redirect.Namespace defined without Redirect.Service")
|
|
}
|
|
} else if r.Service == e.Name {
|
|
// TODO(rb): prevent self loops?
|
|
if r.ServiceSubset != "" && !isSubset(r.ServiceSubset) {
|
|
return fmt.Errorf("Redirect.ServiceSubset %q is not a valid subset of %q", r.ServiceSubset, r.Service)
|
|
}
|
|
} else {
|
|
// TODO(rb): handle validating subsets for other services
|
|
}
|
|
}
|
|
|
|
if len(e.Failover) > 0 {
|
|
for subset, f := range e.Failover {
|
|
if subset != "*" && !isSubset(subset) {
|
|
return fmt.Errorf("Bad Failover[%q]: not a valid subset", subset)
|
|
}
|
|
|
|
if f.Service == "" && f.ServiceSubset == "" && f.Namespace == "" && len(f.Datacenters) == 0 {
|
|
return fmt.Errorf("Bad Failover[%q] one of Service, ServiceSubset, Namespace, or Datacenters is required", subset)
|
|
}
|
|
|
|
if f.ServiceSubset != "" {
|
|
if f.Service == "" || f.Service == e.Name {
|
|
if !isSubset(f.ServiceSubset) {
|
|
return fmt.Errorf("Bad Failover[%q].ServiceSubset %q is not a valid subset of %q", subset, f.ServiceSubset, f.Service)
|
|
}
|
|
} else {
|
|
// TODO(rb): handle validating subsets for other services
|
|
}
|
|
}
|
|
|
|
if f.OverprovisioningFactor < 0 {
|
|
return fmt.Errorf("Bad Failover[%q].OverprovisioningFactor '%d', must be >= 0", subset, f.OverprovisioningFactor)
|
|
}
|
|
|
|
// TODO(rb): more extensive validation will require graph traversal
|
|
|
|
for _, dc := range f.Datacenters {
|
|
if dc == "" {
|
|
return fmt.Errorf("Bad Failover[%q].Datacenters: found empty datacenter", subset)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if e.ConnectTimeout < 0 {
|
|
return fmt.Errorf("Bad ConnectTimeout '%s', must be >= 0", e.ConnectTimeout)
|
|
}
|
|
|
|
// TODO(rb): validate the entire compiled chain? how?
|
|
|
|
// TODO(rb): validate more
|
|
|
|
return nil
|
|
}
|
|
|
|
func (e *ServiceResolverConfigEntry) CanRead(rule acl.Authorizer) bool {
|
|
return canReadDiscoveryChain(e, rule)
|
|
}
|
|
|
|
func (e *ServiceResolverConfigEntry) CanWrite(rule acl.Authorizer) bool {
|
|
return canWriteDiscoveryChain(e, rule)
|
|
}
|
|
|
|
func (e *ServiceResolverConfigEntry) GetRaftIndex() *RaftIndex {
|
|
if e == nil {
|
|
return &RaftIndex{}
|
|
}
|
|
|
|
return &e.RaftIndex
|
|
}
|
|
|
|
func (e *ServiceResolverConfigEntry) ListRelatedServices() []string {
|
|
found := make(map[string]struct{})
|
|
|
|
if e.Redirect != nil {
|
|
if e.Redirect.Service != "" {
|
|
found[e.Redirect.Service] = struct{}{}
|
|
}
|
|
}
|
|
|
|
if len(e.Failover) > 0 {
|
|
for _, failover := range e.Failover {
|
|
if failover.Service != "" {
|
|
found[failover.Service] = struct{}{}
|
|
}
|
|
}
|
|
}
|
|
|
|
out := make([]string, 0, len(found))
|
|
for svc, _ := range found {
|
|
out = append(out, svc)
|
|
}
|
|
sort.Strings(out)
|
|
return out
|
|
}
|
|
|
|
// ServiceResolverSubset defines a way to select a portion of the Consul
|
|
// catalog during service discovery. Anything that affects the ultimate catalog
|
|
// query performed OR post-processing on the results of that sort of query
|
|
// should be defined here.
|
|
type ServiceResolverSubset struct {
|
|
// Filter specifies the go-bexpr filter expression to be used for selecting
|
|
// instances of the requested service.
|
|
Filter string `json:",omitempty"`
|
|
|
|
// OnlyPassing - Specifies the behavior of the resolver's health check
|
|
// filtering. If this is set to false, the results will include instances
|
|
// with checks in the passing as well as the warning states. If this is set
|
|
// to true, only instances with checks in the passing state will be
|
|
// returned. (behaves identically to the similarly named field on prepared
|
|
// queries).
|
|
OnlyPassing bool `json:",omitempty"`
|
|
}
|
|
|
|
type ServiceResolverRedirect struct {
|
|
// Service is a service to resolve instead of the current service
|
|
// (optional).
|
|
Service string `json:",omitempty"`
|
|
|
|
// ServiceSubset is a named subset of the given service to resolve instead
|
|
// of one defined as that service's DefaultSubset If empty the default
|
|
// subset is used (optional).
|
|
//
|
|
// If this is specified at least one of Service, Datacenter, or Namespace
|
|
// should be configured.
|
|
ServiceSubset string `json:",omitempty"`
|
|
|
|
// Namespace is the namespace to resolve the service from instead of the
|
|
// current one (optional).
|
|
Namespace string `json:",omitempty"`
|
|
|
|
// Datacenter is the datacenter to resolve the service from instead of the
|
|
// current one (optional).
|
|
Datacenter string `json:",omitempty"`
|
|
}
|
|
|
|
// There are some restrictions on what is allowed in here:
|
|
//
|
|
// - Service, ServiceSubset, Namespace, NearestN, and Datacenters cannot all be
|
|
// empty at once.
|
|
//
|
|
// - Both 'NearestN' and 'Datacenters' may be specified at once.
|
|
//
|
|
type ServiceResolverFailover struct {
|
|
// Service is the service to resolve instead of the default as the failover
|
|
// group of instances (optional).
|
|
//
|
|
// This is a DESTINATION during failover.
|
|
Service string `json:",omitempty"`
|
|
|
|
// ServiceSubset is the named subset of the requested service to resolve as
|
|
// the failover group of instances. If empty the default subset for the
|
|
// requested service is used (optional).
|
|
//
|
|
// This is a DESTINATION during failover.
|
|
ServiceSubset string `json:",omitempty"`
|
|
|
|
// Namespace is the namespace to resolve the requested service from to form
|
|
// the failover group of instances. If empty the current namespace is used
|
|
// (optional).
|
|
//
|
|
// This is a DESTINATION during failover.
|
|
Namespace string `json:",omitempty"`
|
|
|
|
// NearestN is set to the number of remote datacenters to try, based on
|
|
// network coordinates.
|
|
//
|
|
// This is a DESTINATION during failover.
|
|
//
|
|
// TODO(rb): bring this back after normal DC failover works
|
|
// NearestN int `json:",omitempty"`
|
|
|
|
// Datacenters is a fixed list of datacenters to try after NearestN. We
|
|
// never try a datacenter multiple times, so those are subtracted from this
|
|
// list before proceeding.
|
|
//
|
|
// This is a DESTINATION during failover.
|
|
Datacenters []string `json:",omitempty"`
|
|
|
|
// OverprovisioningFactor is a pass through for envoy's
|
|
// overprovisioning_factor value.
|
|
//
|
|
// If omitted the overprovisioning factor value will be set so high as to
|
|
// imply binary failover (all or nothing).
|
|
OverprovisioningFactor int `json:",omitempty"`
|
|
}
|
|
|
|
type discoveryChainConfigEntry interface {
|
|
ConfigEntry
|
|
// ListRelatedServices returns a list of other names of services referenced
|
|
// in this config entry.
|
|
ListRelatedServices() []string
|
|
}
|
|
|
|
func canReadDiscoveryChain(entry discoveryChainConfigEntry, rule acl.Authorizer) bool {
|
|
return rule.ServiceRead(entry.GetName())
|
|
}
|
|
|
|
func canWriteDiscoveryChain(entry discoveryChainConfigEntry, rule acl.Authorizer) bool {
|
|
name := entry.GetName()
|
|
|
|
if !rule.ServiceWrite(name, nil) {
|
|
return false
|
|
}
|
|
|
|
for _, svc := range entry.ListRelatedServices() {
|
|
if svc == name {
|
|
continue
|
|
}
|
|
|
|
// You only need read on related services to redirect traffic flow for
|
|
// your own service.
|
|
if !rule.ServiceRead(svc) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// DiscoveryChainConfigEntries wraps just the raw cross-referenced config
|
|
// entries. None of these are defaulted.
|
|
type DiscoveryChainConfigEntries struct {
|
|
Routers map[string]*ServiceRouterConfigEntry
|
|
Splitters map[string]*ServiceSplitterConfigEntry
|
|
Resolvers map[string]*ServiceResolverConfigEntry
|
|
Services map[string]*ServiceConfigEntry
|
|
}
|
|
|
|
func (e *DiscoveryChainConfigEntries) GetRouter(name string) *ServiceRouterConfigEntry {
|
|
if e.Routers != nil {
|
|
return e.Routers[name]
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (e *DiscoveryChainConfigEntries) GetSplitter(name string) *ServiceSplitterConfigEntry {
|
|
if e.Splitters != nil {
|
|
return e.Splitters[name]
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (e *DiscoveryChainConfigEntries) GetResolver(name string) *ServiceResolverConfigEntry {
|
|
if e.Resolvers != nil {
|
|
return e.Resolvers[name]
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (e *DiscoveryChainConfigEntries) GetService(name string) *ServiceConfigEntry {
|
|
if e.Services != nil {
|
|
return e.Services[name]
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// AddRouters adds router configs. Convenience function for testing.
|
|
func (e *DiscoveryChainConfigEntries) AddRouters(entries ...*ServiceRouterConfigEntry) {
|
|
if e.Routers == nil {
|
|
e.Routers = make(map[string]*ServiceRouterConfigEntry)
|
|
}
|
|
for _, entry := range entries {
|
|
e.Routers[entry.Name] = entry
|
|
}
|
|
}
|
|
|
|
// AddSplitters adds splitter configs. Convenience function for testing.
|
|
func (e *DiscoveryChainConfigEntries) AddSplitters(entries ...*ServiceSplitterConfigEntry) {
|
|
if e.Splitters == nil {
|
|
e.Splitters = make(map[string]*ServiceSplitterConfigEntry)
|
|
}
|
|
for _, entry := range entries {
|
|
e.Splitters[entry.Name] = entry
|
|
}
|
|
}
|
|
|
|
// AddResolvers adds resolver configs. Convenience function for testing.
|
|
func (e *DiscoveryChainConfigEntries) AddResolvers(entries ...*ServiceResolverConfigEntry) {
|
|
if e.Resolvers == nil {
|
|
e.Resolvers = make(map[string]*ServiceResolverConfigEntry)
|
|
}
|
|
for _, entry := range entries {
|
|
e.Resolvers[entry.Name] = entry
|
|
}
|
|
}
|
|
|
|
// AddServices adds service configs. Convenience function for testing.
|
|
func (e *DiscoveryChainConfigEntries) AddServices(entries ...*ServiceConfigEntry) {
|
|
if e.Services == nil {
|
|
e.Services = make(map[string]*ServiceConfigEntry)
|
|
}
|
|
for _, entry := range entries {
|
|
e.Services[entry.Name] = entry
|
|
}
|
|
}
|
|
|
|
func (e *DiscoveryChainConfigEntries) IsEmpty() bool {
|
|
return e.IsChainEmpty() && len(e.Services) == 0
|
|
}
|
|
|
|
func (e *DiscoveryChainConfigEntries) IsChainEmpty() bool {
|
|
return len(e.Routers) == 0 && len(e.Splitters) == 0 && len(e.Resolvers) == 0
|
|
}
|
|
|
|
type ConfigEntryGraphError struct {
|
|
// one of Message or Err should be set
|
|
Message string
|
|
Err error
|
|
}
|
|
|
|
func (e *ConfigEntryGraphError) Error() string {
|
|
if e.Err != nil {
|
|
return e.Err.Error()
|
|
}
|
|
return e.Message
|
|
}
|