package structs import ( "fmt" "strconv" "strings" "time" "github.com/hashicorp/go-msgpack/codec" "github.com/hashicorp/go-multierror" "github.com/mitchellh/hashstructure" "github.com/mitchellh/mapstructure" "github.com/hashicorp/consul/acl" "github.com/hashicorp/consul/agent/cache" "github.com/hashicorp/consul/lib" "github.com/hashicorp/consul/lib/decode" ) const ( ServiceDefaults string = "service-defaults" ProxyDefaults string = "proxy-defaults" ServiceRouter string = "service-router" ServiceSplitter string = "service-splitter" ServiceResolver string = "service-resolver" IngressGateway string = "ingress-gateway" TerminatingGateway string = "terminating-gateway" ServiceIntentions string = "service-intentions" MeshConfig string = "mesh" ProxyConfigGlobal string = "global" MeshConfigMesh string = "mesh" DefaultServiceProtocol = "tcp" ) var AllConfigEntryKinds = []string{ ServiceDefaults, ProxyDefaults, ServiceRouter, ServiceSplitter, ServiceResolver, IngressGateway, TerminatingGateway, ServiceIntentions, MeshConfig, } // ConfigEntry is the interface for centralized configuration stored in Raft. // Currently only service-defaults and proxy-defaults are supported. type ConfigEntry interface { GetKind() string GetName() string // This is called in the RPC endpoint and can apply defaults or limits. Normalize() error Validate() error // CanRead and CanWrite return whether or not the given Authorizer // has permission to read or write to the config entry, respectively. CanRead(acl.Authorizer) bool CanWrite(acl.Authorizer) bool GetMeta() map[string]string GetEnterpriseMeta() *EnterpriseMeta GetRaftIndex() *RaftIndex } // UpdatableConfigEntry is the optional interface implemented by a ConfigEntry // if it wants more control over how the update part of upsert works // differently than a straight create. By default without this implementation // all upsert operations are replacements. type UpdatableConfigEntry interface { // UpdateOver is called from the state machine when an identically named // config entry already exists. This lets the config entry optionally // choose to use existing information from a config entry (such as // CreateTime) to slightly adjust how the update actually happens. UpdateOver(prev ConfigEntry) error ConfigEntry } // ServiceConfiguration is the top-level struct for the configuration of a service // across the entire cluster. type ServiceConfigEntry struct { Kind string Name string Protocol string Mode ProxyMode `json:",omitempty"` TransparentProxy TransparentProxyConfig `json:",omitempty" alias:"transparent_proxy"` MeshGateway MeshGatewayConfig `json:",omitempty" alias:"mesh_gateway"` Expose ExposeConfig `json:",omitempty"` ExternalSNI string `json:",omitempty" alias:"external_sni"` UpstreamConfig *UpstreamConfiguration `json:",omitempty" alias:"upstream_config"` Meta map[string]string `json:",omitempty"` EnterpriseMeta `hcl:",squash" mapstructure:",squash"` RaftIndex } func (e *ServiceConfigEntry) Clone() *ServiceConfigEntry { e2 := *e e2.Expose = e.Expose.Clone() e2.UpstreamConfig = e.UpstreamConfig.Clone() return &e2 } func (e *ServiceConfigEntry) GetKind() string { return ServiceDefaults } func (e *ServiceConfigEntry) GetName() string { if e == nil { return "" } return e.Name } func (e *ServiceConfigEntry) GetMeta() map[string]string { if e == nil { return nil } return e.Meta } func (e *ServiceConfigEntry) Normalize() error { if e == nil { return fmt.Errorf("config entry is nil") } e.Kind = ServiceDefaults e.Protocol = strings.ToLower(e.Protocol) e.EnterpriseMeta.Normalize() var validationErr error if e.UpstreamConfig != nil { for _, override := range e.UpstreamConfig.Overrides { err := override.NormalizeWithName(&e.EnterpriseMeta) if err != nil { validationErr = multierror.Append(validationErr, fmt.Errorf("error in upstream override for %s: %v", override.ServiceName(), err)) } } if e.UpstreamConfig.Defaults != nil { err := e.UpstreamConfig.Defaults.NormalizeWithoutName() if err != nil { validationErr = multierror.Append(validationErr, fmt.Errorf("error in upstream defaults: %v", err)) } } } return validationErr } func (e *ServiceConfigEntry) Validate() error { if e.Name == "" { return fmt.Errorf("Name is required") } if e.Name == WildcardSpecifier { return fmt.Errorf("service-defaults name must be the name of a service, and not a wildcard") } validationErr := validateConfigEntryMeta(e.Meta) if e.UpstreamConfig != nil { for _, override := range e.UpstreamConfig.Overrides { err := override.ValidateWithName() if err != nil { validationErr = multierror.Append(validationErr, fmt.Errorf("error in upstream override for %s: %v", override.ServiceName(), err)) } } if e.UpstreamConfig.Defaults != nil { if err := e.UpstreamConfig.Defaults.ValidateWithoutName(); err != nil { validationErr = multierror.Append(validationErr, fmt.Errorf("error in upstream defaults: %v", err)) } } } return validationErr } func (e *ServiceConfigEntry) CanRead(authz acl.Authorizer) bool { var authzContext acl.AuthorizerContext e.FillAuthzContext(&authzContext) return authz.ServiceRead(e.Name, &authzContext) == acl.Allow } func (e *ServiceConfigEntry) CanWrite(authz acl.Authorizer) bool { var authzContext acl.AuthorizerContext e.FillAuthzContext(&authzContext) return authz.ServiceWrite(e.Name, &authzContext) == acl.Allow } func (e *ServiceConfigEntry) GetRaftIndex() *RaftIndex { if e == nil { return &RaftIndex{} } return &e.RaftIndex } func (e *ServiceConfigEntry) GetEnterpriseMeta() *EnterpriseMeta { if e == nil { return nil } return &e.EnterpriseMeta } type UpstreamConfiguration struct { // Overrides is a slice of per-service configuration. The name field is // required. Overrides []*UpstreamConfig `json:",omitempty"` // Defaults contains default configuration for all upstreams of a given // service. The name field must be empty. Defaults *UpstreamConfig `json:",omitempty"` } func (c *UpstreamConfiguration) Clone() *UpstreamConfiguration { if c == nil { return nil } var c2 UpstreamConfiguration if len(c.Overrides) > 0 { c2.Overrides = make([]*UpstreamConfig, 0, len(c.Overrides)) for _, o := range c.Overrides { dup := o.Clone() c2.Overrides = append(c2.Overrides, &dup) } } if c.Defaults != nil { def2 := c.Defaults.Clone() c2.Defaults = &def2 } return &c2 } // ProxyConfigEntry is the top-level struct for global proxy configuration defaults. type ProxyConfigEntry struct { Kind string Name string Config map[string]interface{} Mode ProxyMode `json:",omitempty"` TransparentProxy TransparentProxyConfig `json:",omitempty" alias:"transparent_proxy"` MeshGateway MeshGatewayConfig `json:",omitempty" alias:"mesh_gateway"` Expose ExposeConfig `json:",omitempty"` Meta map[string]string `json:",omitempty"` EnterpriseMeta `hcl:",squash" mapstructure:",squash"` RaftIndex } func (e *ProxyConfigEntry) GetKind() string { return ProxyDefaults } func (e *ProxyConfigEntry) GetName() string { if e == nil { return "" } return e.Name } func (e *ProxyConfigEntry) GetMeta() map[string]string { if e == nil { return nil } return e.Meta } func (e *ProxyConfigEntry) Normalize() error { if e == nil { return fmt.Errorf("config entry is nil") } e.Kind = ProxyDefaults e.Name = ProxyConfigGlobal e.EnterpriseMeta.Normalize() return nil } func (e *ProxyConfigEntry) Validate() error { if e == nil { return fmt.Errorf("config entry is nil") } if e.Name != ProxyConfigGlobal { return fmt.Errorf("invalid name (%q), only %q is supported", e.Name, ProxyConfigGlobal) } if err := validateConfigEntryMeta(e.Meta); err != nil { return err } return e.validateEnterpriseMeta() } func (e *ProxyConfigEntry) CanRead(authz acl.Authorizer) bool { return true } func (e *ProxyConfigEntry) CanWrite(authz acl.Authorizer) bool { var authzContext acl.AuthorizerContext e.FillAuthzContext(&authzContext) return authz.OperatorWrite(&authzContext) == acl.Allow } func (e *ProxyConfigEntry) GetRaftIndex() *RaftIndex { if e == nil { return &RaftIndex{} } return &e.RaftIndex } func (e *ProxyConfigEntry) GetEnterpriseMeta() *EnterpriseMeta { if e == nil { return nil } return &e.EnterpriseMeta } func (e *ProxyConfigEntry) MarshalBinary() (data []byte, err error) { // We mainly want to implement the BinaryMarshaller interface so that // we can fixup some msgpack types to coerce them into JSON compatible // values. No special encoding needs to be done - we just simply msgpack // encode the struct which requires a type alias to prevent recursively // calling this function. type alias ProxyConfigEntry a := alias(*e) // bs will grow if needed but allocate enough to avoid reallocation in common // case. bs := make([]byte, 128) enc := codec.NewEncoderBytes(&bs, MsgpackHandle) err = enc.Encode(a) if err != nil { return nil, err } return bs, nil } func (e *ProxyConfigEntry) UnmarshalBinary(data []byte) error { // The goal here is to add a post-decoding operation to // decoding of a ProxyConfigEntry. The cleanest way I could // find to do so was to implement the BinaryMarshaller interface // and use a type alias to do the original round of decoding, // followed by a MapWalk of the Config to coerce everything // into JSON compatible types. type alias ProxyConfigEntry var a alias dec := codec.NewDecoderBytes(data, MsgpackHandle) if err := dec.Decode(&a); err != nil { return err } *e = ProxyConfigEntry(a) config, err := lib.MapWalk(e.Config) if err != nil { return err } e.Config = config return nil } // DecodeConfigEntry can be used to decode a ConfigEntry from a raw map value. // Currently its used in the HTTP API to decode ConfigEntry structs coming from // JSON. Unlike some of our custom binary encodings we don't have a preamble including // the kind so we will not have a concrete type to decode into. In those cases we must // first decode into a map[string]interface{} and then call this function to decode // into a concrete type. // // There is an 'api' variation of this in // command/config/write/config_write.go:newDecodeConfigEntry func DecodeConfigEntry(raw map[string]interface{}) (ConfigEntry, error) { var entry ConfigEntry kindVal, ok := raw["Kind"] if !ok { kindVal, ok = raw["kind"] } if !ok { return nil, fmt.Errorf("Payload does not contain a kind/Kind key at the top level") } if kindStr, ok := kindVal.(string); ok { newEntry, err := MakeConfigEntry(kindStr, "") if err != nil { return nil, err } entry = newEntry } else { return nil, fmt.Errorf("Kind value in payload is not a string") } var md mapstructure.Metadata decodeConf := &mapstructure.DecoderConfig{ DecodeHook: mapstructure.ComposeDecodeHookFunc( decode.HookWeakDecodeFromSlice, decode.HookTranslateKeys, mapstructure.StringToTimeDurationHookFunc(), mapstructure.StringToTimeHookFunc(time.RFC3339), ), Metadata: &md, Result: &entry, WeaklyTypedInput: true, } decoder, err := mapstructure.NewDecoder(decodeConf) if err != nil { return nil, err } if err := decoder.Decode(raw); err != nil { return nil, err } if err := validateUnusedKeys(md.Unused); err != nil { return nil, err } return entry, nil } type ConfigEntryOp string const ( ConfigEntryUpsert ConfigEntryOp = "upsert" ConfigEntryUpsertCAS ConfigEntryOp = "upsert-cas" ConfigEntryDelete ConfigEntryOp = "delete" ) // ConfigEntryRequest is used when creating/updating/deleting a ConfigEntry. type ConfigEntryRequest struct { Op ConfigEntryOp Datacenter string Entry ConfigEntry WriteRequest } func (c *ConfigEntryRequest) RequestDatacenter() string { return c.Datacenter } func (c *ConfigEntryRequest) MarshalBinary() (data []byte, err error) { // bs will grow if needed but allocate enough to avoid reallocation in common // case. bs := make([]byte, 128) enc := codec.NewEncoderBytes(&bs, MsgpackHandle) // Encode kind first err = enc.Encode(c.Entry.GetKind()) if err != nil { return nil, err } // Then actual value using alias trick to avoid infinite recursion type Alias ConfigEntryRequest err = enc.Encode(struct { *Alias }{ Alias: (*Alias)(c), }) if err != nil { return nil, err } return bs, nil } func (c *ConfigEntryRequest) UnmarshalBinary(data []byte) error { // First decode the kind prefix var kind string dec := codec.NewDecoderBytes(data, MsgpackHandle) if err := dec.Decode(&kind); err != nil { return err } // Then decode the real thing with appropriate kind of ConfigEntry entry, err := MakeConfigEntry(kind, "") if err != nil { return err } c.Entry = entry // Alias juggling to prevent infinite recursive calls back to this decode // method. type Alias ConfigEntryRequest as := struct { *Alias }{ Alias: (*Alias)(c), } if err := dec.Decode(&as); err != nil { return err } return nil } func MakeConfigEntry(kind, name string) (ConfigEntry, error) { switch kind { case ServiceDefaults: return &ServiceConfigEntry{Name: name}, nil case ProxyDefaults: return &ProxyConfigEntry{Name: name}, nil case ServiceRouter: return &ServiceRouterConfigEntry{Name: name}, nil case ServiceSplitter: return &ServiceSplitterConfigEntry{Name: name}, nil case ServiceResolver: return &ServiceResolverConfigEntry{Name: name}, nil case IngressGateway: return &IngressGatewayConfigEntry{Name: name}, nil case TerminatingGateway: return &TerminatingGatewayConfigEntry{Name: name}, nil case ServiceIntentions: return &ServiceIntentionsConfigEntry{Name: name}, nil case MeshConfig: return &MeshConfigEntry{Name: name}, nil default: return nil, fmt.Errorf("invalid config entry kind: %s", kind) } } func ValidateConfigEntryKind(kind string) bool { switch kind { case ServiceDefaults, ProxyDefaults: return true case ServiceRouter, ServiceSplitter, ServiceResolver: return true case IngressGateway, TerminatingGateway: return true case ServiceIntentions: return true default: return false } } // ConfigEntryQuery is used when requesting info about a config entry. type ConfigEntryQuery struct { Kind string Name string Datacenter string EnterpriseMeta `hcl:",squash" mapstructure:",squash"` QueryOptions } func (c *ConfigEntryQuery) RequestDatacenter() string { return c.Datacenter } func (r *ConfigEntryQuery) CacheInfo() cache.RequestInfo { info := cache.RequestInfo{ Token: r.Token, Datacenter: r.Datacenter, MinIndex: r.MinQueryIndex, Timeout: r.MaxQueryTime, MaxAge: r.MaxAge, MustRevalidate: r.MustRevalidate, } v, err := hashstructure.Hash([]interface{}{ r.Kind, r.Name, r.Filter, r.EnterpriseMeta, }, nil) if err == nil { // If there is an error, we don't set the key. A blank key forces // no cache for this request so the request is forwarded directly // to the server. info.Key = strconv.FormatUint(v, 10) } return info } // ConfigEntryListAllRequest is used when requesting to list all config entries // of a set of kinds. type ConfigEntryListAllRequest struct { // Kinds should always be set. For backwards compatibility with versions // prior to 1.9.0, if this is omitted or left empty it is assumed to mean // the subset of config entry kinds that were present in 1.8.0: // // proxy-defaults, service-defaults, service-resolver, service-splitter, // service-router, terminating-gateway, and ingress-gateway. Kinds []string Datacenter string EnterpriseMeta `hcl:",squash" mapstructure:",squash"` QueryOptions } func (r *ConfigEntryListAllRequest) RequestDatacenter() string { return r.Datacenter } // ServiceConfigRequest is used when requesting the resolved configuration // for a service. type ServiceConfigRequest struct { Name string Datacenter string // MeshGateway contains the mesh gateway configuration from the requesting proxy's registration MeshGateway MeshGatewayConfig // Mode indicates how the requesting proxy's listeners are dialed Mode ProxyMode UpstreamIDs []ServiceID // DEPRECATED // Upstreams is a list of upstream service names to use for resolving the service config // UpstreamIDs should be used instead which can encode more than just the name to // uniquely identify a service. Upstreams []string EnterpriseMeta `hcl:",squash" mapstructure:",squash"` QueryOptions } func (s *ServiceConfigRequest) RequestDatacenter() string { return s.Datacenter } func (r *ServiceConfigRequest) CacheInfo() cache.RequestInfo { info := cache.RequestInfo{ Token: r.Token, Datacenter: r.Datacenter, MinIndex: r.MinQueryIndex, Timeout: r.MaxQueryTime, MaxAge: r.MaxAge, MustRevalidate: r.MustRevalidate, } // To calculate the cache key we only hash the service name and upstream set. // We don't want ordering of the upstreams to affect the outcome so use an // anonymous struct field with hash:set behavior. Note the order of fields in // the slice would affect cache keys if we ever persist between agent restarts // and change it. v, err := hashstructure.Hash(struct { Name string EnterpriseMeta EnterpriseMeta Upstreams []string `hash:"set"` }{ Name: r.Name, EnterpriseMeta: r.EnterpriseMeta, Upstreams: r.Upstreams, }, nil) if err == nil { // If there is an error, we don't set the key. A blank key forces // no cache for this request so the request is forwarded directly // to the server. info.Key = strconv.FormatUint(v, 10) } return info } type UpstreamConfig struct { // Name is only accepted within a service-defaults config entry. Name string `json:",omitempty"` // EnterpriseMeta is only accepted within a service-defaults config entry. EnterpriseMeta `hcl:",squash" mapstructure:",squash"` // EnvoyListenerJSON is a complete override ("escape hatch") for the upstream's // listener. // // Note: This escape hatch is NOT compatible with the discovery chain and // will be ignored if a discovery chain is active. EnvoyListenerJSON string `json:",omitempty" alias:"envoy_listener_json"` // EnvoyClusterJSON is a complete override ("escape hatch") for the upstream's // cluster. The Connect client TLS certificate and context will be injected // overriding any TLS settings present. // // Note: This escape hatch is NOT compatible with the discovery chain and // will be ignored if a discovery chain is active. EnvoyClusterJSON string `json:",omitempty" alias:"envoy_cluster_json"` // Protocol describes the upstream's service protocol. Valid values are "tcp", // "http" and "grpc". Anything else is treated as tcp. The enables protocol // aware features like per-request metrics and connection pooling, tracing, // routing etc. Protocol string `json:",omitempty"` // ConnectTimeoutMs is the number of milliseconds to timeout making a new // connection to this upstream. Defaults to 5000 (5 seconds) if not set. ConnectTimeoutMs int `json:",omitempty" alias:"connect_timeout_ms"` // Limits are the set of limits that are applied to the proxy for a specific upstream of a // service instance. Limits *UpstreamLimits `json:",omitempty"` // PassiveHealthCheck configuration determines how upstream proxy instances will // be monitored for removal from the load balancing pool. PassiveHealthCheck *PassiveHealthCheck `json:",omitempty" alias:"passive_health_check"` // MeshGatewayConfig controls how Mesh Gateways are configured and used MeshGateway MeshGatewayConfig `json:",omitempty" alias:"mesh_gateway" ` } func (cfg UpstreamConfig) Clone() UpstreamConfig { cfg2 := cfg cfg2.Limits = cfg.Limits.Clone() cfg2.PassiveHealthCheck = cfg.PassiveHealthCheck.Clone() return cfg2 } func (cfg *UpstreamConfig) ServiceID() ServiceID { if cfg.Name == "" { return ServiceID{} } return NewServiceID(cfg.Name, &cfg.EnterpriseMeta) } func (cfg *UpstreamConfig) ServiceName() ServiceName { if cfg.Name == "" { return ServiceName{} } return NewServiceName(cfg.Name, &cfg.EnterpriseMeta) } func (cfg UpstreamConfig) MergeInto(dst map[string]interface{}) { // Avoid storing empty values in the map, since these can act as overrides if cfg.EnvoyListenerJSON != "" { dst["envoy_listener_json"] = cfg.EnvoyListenerJSON } if cfg.EnvoyClusterJSON != "" { dst["envoy_cluster_json"] = cfg.EnvoyClusterJSON } if cfg.Protocol != "" { dst["protocol"] = cfg.Protocol } if cfg.ConnectTimeoutMs != 0 { dst["connect_timeout_ms"] = cfg.ConnectTimeoutMs } if !cfg.MeshGateway.IsZero() { dst["mesh_gateway"] = cfg.MeshGateway } if cfg.Limits != nil { dst["limits"] = cfg.Limits } if cfg.PassiveHealthCheck != nil { dst["passive_health_check"] = cfg.PassiveHealthCheck } } func (cfg *UpstreamConfig) NormalizeWithoutName() error { return cfg.normalize(false, nil) } func (cfg *UpstreamConfig) NormalizeWithName(entMeta *EnterpriseMeta) error { return cfg.normalize(true, entMeta) } func (cfg *UpstreamConfig) normalize(named bool, entMeta *EnterpriseMeta) error { if named { // If the upstream namespace is omitted it inherits that of the enclosing // config entry. cfg.EnterpriseMeta.MergeNoWildcard(entMeta) cfg.EnterpriseMeta.Normalize() } cfg.Protocol = strings.ToLower(cfg.Protocol) if cfg.ConnectTimeoutMs < 0 { cfg.ConnectTimeoutMs = 0 } return nil } func (cfg UpstreamConfig) ValidateWithoutName() error { return cfg.validate(false) } func (cfg UpstreamConfig) ValidateWithName() error { return cfg.validate(true) } func (cfg UpstreamConfig) validate(named bool) error { if named { if cfg.Name == "" { return fmt.Errorf("Name is required") } } else { if cfg.Name != "" { return fmt.Errorf("Name must be empty") } if cfg.EnterpriseMeta.NamespaceOrEmpty() != "" { return fmt.Errorf("Namespace must be empty") } } var validationErr error if cfg.PassiveHealthCheck != nil { err := cfg.PassiveHealthCheck.Validate() if err != nil { validationErr = multierror.Append(validationErr, err) } } if cfg.Limits != nil { err := cfg.Limits.Validate() if err != nil { validationErr = multierror.Append(validationErr, err) } } return validationErr } func ParseUpstreamConfigNoDefaults(m map[string]interface{}) (UpstreamConfig, error) { var cfg UpstreamConfig config := &mapstructure.DecoderConfig{ DecodeHook: mapstructure.ComposeDecodeHookFunc( decode.HookWeakDecodeFromSlice, decode.HookTranslateKeys, mapstructure.StringToTimeDurationHookFunc(), ), Result: &cfg, WeaklyTypedInput: true, } decoder, err := mapstructure.NewDecoder(config) if err != nil { return cfg, err } if err := decoder.Decode(m); err != nil { return cfg, err } err = cfg.NormalizeWithoutName() return cfg, err } // ParseUpstreamConfig returns the UpstreamConfig parsed from an opaque map. // If an error occurs during parsing it is returned along with the default // config this allows caller to choose whether and how to report the error. func ParseUpstreamConfig(m map[string]interface{}) (UpstreamConfig, error) { cfg, err := ParseUpstreamConfigNoDefaults(m) // Set default (even if error is returned) if cfg.Protocol == "" { cfg.Protocol = "tcp" } if cfg.ConnectTimeoutMs == 0 { cfg.ConnectTimeoutMs = 5000 } return cfg, err } type PassiveHealthCheck struct { // Interval between health check analysis sweeps. Each sweep may remove // hosts or return hosts to the pool. Interval time.Duration `json:",omitempty"` // MaxFailures is the count of consecutive failures that results in a host // being removed from the pool. MaxFailures uint32 `json:",omitempty" alias:"max_failures"` } func (chk *PassiveHealthCheck) Clone() *PassiveHealthCheck { if chk == nil { return nil } chk2 := *chk return &chk2 } func (chk *PassiveHealthCheck) IsZero() bool { zeroVal := PassiveHealthCheck{} return *chk == zeroVal } func (chk PassiveHealthCheck) Validate() error { if chk.Interval < 0*time.Second { return fmt.Errorf("passive health check interval cannot be negative") } return nil } // UpstreamLimits describes the limits that are associated with a specific // upstream of a service instance. type UpstreamLimits struct { // MaxConnections is the maximum number of connections the local proxy can // make to the upstream service. MaxConnections *int `json:",omitempty" alias:"max_connections"` // MaxPendingRequests is the maximum number of requests that will be queued // waiting for an available connection. This is mostly applicable to HTTP/1.1 // clusters since all HTTP/2 requests are streamed over a single // connection. MaxPendingRequests *int `json:",omitempty" alias:"max_pending_requests"` // MaxConcurrentRequests is the maximum number of in-flight requests that will be allowed // to the upstream cluster at a point in time. This is mostly applicable to HTTP/2 // clusters since all HTTP/1.1 requests are limited by MaxConnections. MaxConcurrentRequests *int `json:",omitempty" alias:"max_concurrent_requests"` } func (ul *UpstreamLimits) Clone() *UpstreamLimits { if ul == nil { return nil } return &UpstreamLimits{ MaxConnections: intPointerCopy(ul.MaxConnections), MaxPendingRequests: intPointerCopy(ul.MaxPendingRequests), MaxConcurrentRequests: intPointerCopy(ul.MaxConcurrentRequests), } } func intPointerCopy(v *int) *int { if v == nil { return nil } v2 := *v return &v2 } func (ul *UpstreamLimits) IsZero() bool { zeroVal := UpstreamLimits{} return *ul == zeroVal } func (ul UpstreamLimits) Validate() error { if ul.MaxConnections != nil && *ul.MaxConnections < 0 { return fmt.Errorf("max connections cannot be negative") } if ul.MaxPendingRequests != nil && *ul.MaxPendingRequests < 0 { return fmt.Errorf("max pending requests cannot be negative") } if ul.MaxConcurrentRequests != nil && *ul.MaxConcurrentRequests < 0 { return fmt.Errorf("max concurrent requests cannot be negative") } return nil } type OpaqueUpstreamConfig struct { Upstream ServiceID Config map[string]interface{} } type OpaqueUpstreamConfigs []OpaqueUpstreamConfig func (configs OpaqueUpstreamConfigs) GetUpstreamConfig(sid ServiceID) (config map[string]interface{}, found bool) { for _, usconf := range configs { if usconf.Upstream.Matches(sid) { return usconf.Config, true } } return nil, false } type ServiceConfigResponse struct { ProxyConfig map[string]interface{} UpstreamConfigs map[string]map[string]interface{} UpstreamIDConfigs OpaqueUpstreamConfigs MeshGateway MeshGatewayConfig `json:",omitempty"` Expose ExposeConfig `json:",omitempty"` TransparentProxy TransparentProxyConfig `json:",omitempty"` Mode ProxyMode `json:",omitempty"` QueryMeta } func (r *ServiceConfigResponse) Reset() { r.ProxyConfig = nil r.UpstreamConfigs = nil r.MeshGateway = MeshGatewayConfig{} } // MarshalBinary writes ServiceConfigResponse as msgpack encoded. It's only here // because we need custom decoding of the raw interface{} values. func (r *ServiceConfigResponse) MarshalBinary() (data []byte, err error) { // bs will grow if needed but allocate enough to avoid reallocation in common // case. bs := make([]byte, 128) enc := codec.NewEncoderBytes(&bs, MsgpackHandle) type Alias ServiceConfigResponse if err := enc.Encode((*Alias)(r)); err != nil { return nil, err } return bs, nil } // UnmarshalBinary decodes msgpack encoded ServiceConfigResponse. It used // default msgpack encoding but fixes up the uint8 strings and other problems we // have with encoding map[string]interface{}. func (r *ServiceConfigResponse) UnmarshalBinary(data []byte) error { dec := codec.NewDecoderBytes(data, MsgpackHandle) type Alias ServiceConfigResponse var a Alias if err := dec.Decode(&a); err != nil { return err } *r = ServiceConfigResponse(a) var err error // Fix strings and maps in the returned maps r.ProxyConfig, err = lib.MapWalk(r.ProxyConfig) if err != nil { return err } for k := range r.UpstreamConfigs { r.UpstreamConfigs[k], err = lib.MapWalk(r.UpstreamConfigs[k]) if err != nil { return err } } for k := range r.UpstreamIDConfigs { r.UpstreamIDConfigs[k].Config, err = lib.MapWalk(r.UpstreamIDConfigs[k].Config) if err != nil { return err } } return nil } // ConfigEntryResponse returns a single ConfigEntry type ConfigEntryResponse struct { Entry ConfigEntry QueryMeta } func (c *ConfigEntryResponse) MarshalBinary() (data []byte, err error) { // bs will grow if needed but allocate enough to avoid reallocation in common // case. bs := make([]byte, 128) enc := codec.NewEncoderBytes(&bs, MsgpackHandle) if c.Entry != nil { if err := enc.Encode(c.Entry.GetKind()); err != nil { return nil, err } if err := enc.Encode(c.Entry); err != nil { return nil, err } } else { if err := enc.Encode(""); err != nil { return nil, err } } if err := enc.Encode(c.QueryMeta); err != nil { return nil, err } return bs, nil } func (c *ConfigEntryResponse) UnmarshalBinary(data []byte) error { dec := codec.NewDecoderBytes(data, MsgpackHandle) var kind string if err := dec.Decode(&kind); err != nil { return err } if kind != "" { entry, err := MakeConfigEntry(kind, "") if err != nil { return err } if err := dec.Decode(entry); err != nil { return err } c.Entry = entry } else { c.Entry = nil } if err := dec.Decode(&c.QueryMeta); err != nil { return err } return nil } func validateConfigEntryMeta(meta map[string]string) error { var err error if len(meta) > metaMaxKeyPairs { err = multierror.Append(err, fmt.Errorf( "Meta exceeds maximum element count %d", metaMaxKeyPairs)) } for k, v := range meta { if len(k) > metaKeyMaxLength { err = multierror.Append(err, fmt.Errorf( "Meta key %q exceeds maximum length %d", k, metaKeyMaxLength)) } if len(v) > metaValueMaxLength { err = multierror.Append(err, fmt.Errorf( "Meta value for key %q exceeds maximum length %d", k, metaValueMaxLength)) } } return err }