open-consul/api/config_entry.go

529 lines
18 KiB
Go

package api
import (
"bytes"
"encoding/json"
"fmt"
"io"
"strconv"
"strings"
"time"
"github.com/mitchellh/mapstructure"
)
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"
ExportedServices string = "exported-services"
ProxyConfigGlobal string = "global"
MeshConfigMesh string = "mesh"
)
type ConfigEntry interface {
GetKind() string
GetName() string
GetPartition() string
GetNamespace() string
GetMeta() map[string]string
GetCreateIndex() uint64
GetModifyIndex() uint64
}
type MeshGatewayMode string
const (
// MeshGatewayModeDefault represents no specific mode and should
// be used to indicate that a different layer of the configuration
// chain should take precedence
MeshGatewayModeDefault MeshGatewayMode = ""
// MeshGatewayModeNone represents that the Upstream Connect connections
// should be direct and not flow through a mesh gateway.
MeshGatewayModeNone MeshGatewayMode = "none"
// MeshGatewayModeLocal represents that the Upstream Connect connections
// should be made to a mesh gateway in the local datacenter.
MeshGatewayModeLocal MeshGatewayMode = "local"
// MeshGatewayModeRemote represents that the Upstream Connect connections
// should be made to a mesh gateway in a remote datacenter.
MeshGatewayModeRemote MeshGatewayMode = "remote"
)
// MeshGatewayConfig controls how Mesh Gateways are used for upstream Connect
// services
type MeshGatewayConfig struct {
// Mode is the mode that should be used for the upstream connection.
Mode MeshGatewayMode `json:",omitempty"`
}
type ProxyMode string
const (
// ProxyModeDefault represents no specific mode and should
// be used to indicate that a different layer of the configuration
// chain should take precedence
ProxyModeDefault ProxyMode = ""
// ProxyModeTransparent represents that inbound and outbound application
// traffic is being captured and redirected through the proxy.
ProxyModeTransparent ProxyMode = "transparent"
// ProxyModeDirect represents that the proxy's listeners must be dialed directly
// by the local application and other proxies.
ProxyModeDirect ProxyMode = "direct"
)
type TransparentProxyConfig struct {
// The port of the listener where outbound application traffic is being redirected to.
OutboundListenerPort int `json:",omitempty" alias:"outbound_listener_port"`
// DialedDirectly indicates whether transparent proxies can dial this proxy instance directly.
// The discovery chain is not considered when dialing a service instance directly.
// This setting is useful when addressing stateful services, such as a database cluster with a leader node.
DialedDirectly bool `json:",omitempty" alias:"dialed_directly"`
}
// ExposeConfig describes HTTP paths to expose through Envoy outside of Connect.
// Users can expose individual paths and/or all HTTP/GRPC paths for checks.
type ExposeConfig struct {
// Checks defines whether paths associated with Consul checks will be exposed.
// This flag triggers exposing all HTTP and GRPC check paths registered for the service.
Checks bool `json:",omitempty"`
// Paths is the list of paths exposed through the proxy.
Paths []ExposePath `json:",omitempty"`
}
type ExposePath struct {
// ListenerPort defines the port of the proxy's listener for exposed paths.
ListenerPort int `json:",omitempty" alias:"listener_port"`
// Path is the path to expose through the proxy, ie. "/metrics."
Path string `json:",omitempty"`
// LocalPathPort is the port that the service is listening on for the given path.
LocalPathPort int `json:",omitempty" alias:"local_path_port"`
// Protocol describes the upstream's service protocol.
// Valid values are "http" and "http2", defaults to "http"
Protocol string `json:",omitempty"`
// ParsedFromCheck is set if this path was parsed from a registered check
ParsedFromCheck bool
}
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"`
}
type UpstreamConfig struct {
// Name is only accepted within a service-defaults config entry.
Name string `json:",omitempty"`
// Partition is only accepted within a service-defaults config entry.
Partition string `json:",omitempty"`
// Namespace is only accepted within a service-defaults config entry.
Namespace string `json:",omitempty"`
// 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" `
}
// DestinationConfig represents a virtual service, i.e. one that is external to Consul
type DestinationConfig struct {
// Addresses of the endpoint; hostname or IP
Addresses []string `json:",omitempty"`
// Port allowed within this endpoint
Port int `json:",omitempty"`
}
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 `alias:"max_failures"`
// EnforcingConsecutive5xx is the % chance that a host will be actually ejected
// when an outlier status is detected through consecutive 5xx.
// This setting can be used to disable ejection or to ramp it up slowly.
EnforcingConsecutive5xx uint32 `json:",omitempty" alias:"enforcing_consecutive_5xx"`
}
// 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 `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 `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 `alias:"max_concurrent_requests"`
}
type ServiceConfigEntry struct {
Kind string
Name string
Partition string `json:",omitempty"`
Namespace string `json:",omitempty"`
Protocol string `json:",omitempty"`
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"`
Destination *DestinationConfig `json:",omitempty"`
MaxInboundConnections int `json:",omitempty" alias:"max_inbound_connections"`
Meta map[string]string `json:",omitempty"`
CreateIndex uint64
ModifyIndex uint64
}
func (s *ServiceConfigEntry) GetKind() string { return s.Kind }
func (s *ServiceConfigEntry) GetName() string { return s.Name }
func (s *ServiceConfigEntry) GetPartition() string { return s.Partition }
func (s *ServiceConfigEntry) GetNamespace() string { return s.Namespace }
func (s *ServiceConfigEntry) GetMeta() map[string]string { return s.Meta }
func (s *ServiceConfigEntry) GetCreateIndex() uint64 { return s.CreateIndex }
func (s *ServiceConfigEntry) GetModifyIndex() uint64 { return s.ModifyIndex }
type ProxyConfigEntry struct {
Kind string
Name string
Partition string `json:",omitempty"`
Namespace string `json:",omitempty"`
Mode ProxyMode `json:",omitempty"`
TransparentProxy *TransparentProxyConfig `json:",omitempty" alias:"transparent_proxy"`
Config map[string]interface{} `json:",omitempty"`
MeshGateway MeshGatewayConfig `json:",omitempty" alias:"mesh_gateway"`
Expose ExposeConfig `json:",omitempty"`
Meta map[string]string `json:",omitempty"`
CreateIndex uint64
ModifyIndex uint64
}
func (p *ProxyConfigEntry) GetKind() string { return p.Kind }
func (p *ProxyConfigEntry) GetName() string { return p.Name }
func (p *ProxyConfigEntry) GetPartition() string { return p.Partition }
func (p *ProxyConfigEntry) GetNamespace() string { return p.Namespace }
func (p *ProxyConfigEntry) GetMeta() map[string]string { return p.Meta }
func (p *ProxyConfigEntry) GetCreateIndex() uint64 { return p.CreateIndex }
func (p *ProxyConfigEntry) GetModifyIndex() uint64 { return p.ModifyIndex }
func makeConfigEntry(kind, name string) (ConfigEntry, error) {
switch kind {
case ServiceDefaults:
return &ServiceConfigEntry{Kind: kind, Name: name}, nil
case ProxyDefaults:
return &ProxyConfigEntry{Kind: kind, Name: name}, nil
case ServiceRouter:
return &ServiceRouterConfigEntry{Kind: kind, Name: name}, nil
case ServiceSplitter:
return &ServiceSplitterConfigEntry{Kind: kind, Name: name}, nil
case ServiceResolver:
return &ServiceResolverConfigEntry{Kind: kind, Name: name}, nil
case IngressGateway:
return &IngressGatewayConfigEntry{Kind: kind, Name: name}, nil
case TerminatingGateway:
return &TerminatingGatewayConfigEntry{Kind: kind, Name: name}, nil
case ServiceIntentions:
return &ServiceIntentionsConfigEntry{Kind: kind, Name: name}, nil
case MeshConfig:
return &MeshConfigEntry{}, nil
case ExportedServices:
return &ExportedServicesConfigEntry{Name: name}, nil
default:
return nil, fmt.Errorf("invalid config entry kind: %s", kind)
}
}
func MakeConfigEntry(kind, name string) (ConfigEntry, error) {
return makeConfigEntry(kind, name)
}
// DecodeConfigEntry will decode the result of using json.Unmarshal of a config
// entry into a map[string]interface{}.
//
// Important caveats:
//
// - This will NOT work if the map[string]interface{} was produced using HCL
// decoding as that requires more extensive parsing to work around the issues
// with map[string][]interface{} that arise.
//
// - This will only decode fields using their camel case json field
// representations.
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")
}
decodeConf := &mapstructure.DecoderConfig{
DecodeHook: mapstructure.ComposeDecodeHookFunc(
mapstructure.StringToTimeDurationHookFunc(),
mapstructure.StringToTimeHookFunc(time.RFC3339),
),
Result: &entry,
WeaklyTypedInput: true,
}
decoder, err := mapstructure.NewDecoder(decodeConf)
if err != nil {
return nil, err
}
return entry, decoder.Decode(raw)
}
func DecodeConfigEntryFromJSON(data []byte) (ConfigEntry, error) {
var raw map[string]interface{}
if err := json.Unmarshal(data, &raw); err != nil {
return nil, err
}
return DecodeConfigEntry(raw)
}
func decodeConfigEntrySlice(raw []map[string]interface{}) ([]ConfigEntry, error) {
var entries []ConfigEntry
for _, rawEntry := range raw {
entry, err := DecodeConfigEntry(rawEntry)
if err != nil {
return nil, err
}
entries = append(entries, entry)
}
return entries, nil
}
// ConfigEntries can be used to query the Config endpoints
type ConfigEntries struct {
c *Client
}
// Config returns a handle to the Config endpoints
func (c *Client) ConfigEntries() *ConfigEntries {
return &ConfigEntries{c}
}
func (conf *ConfigEntries) Get(kind string, name string, q *QueryOptions) (ConfigEntry, *QueryMeta, error) {
if kind == "" || name == "" {
return nil, nil, fmt.Errorf("Both kind and name parameters must not be empty")
}
entry, err := makeConfigEntry(kind, name)
if err != nil {
return nil, nil, err
}
r := conf.c.newRequest("GET", fmt.Sprintf("/v1/config/%s/%s", kind, name))
r.setQueryOptions(q)
rtt, resp, err := conf.c.doRequest(r)
if err != nil {
return nil, nil, err
}
defer closeResponseBody(resp)
if err := requireOK(resp); err != nil {
return nil, nil, err
}
qm := &QueryMeta{}
parseQueryMeta(resp, qm)
qm.RequestTime = rtt
if err := decodeBody(resp, entry); err != nil {
return nil, nil, err
}
return entry, qm, nil
}
func (conf *ConfigEntries) List(kind string, q *QueryOptions) ([]ConfigEntry, *QueryMeta, error) {
if kind == "" {
return nil, nil, fmt.Errorf("The kind parameter must not be empty")
}
r := conf.c.newRequest("GET", fmt.Sprintf("/v1/config/%s", kind))
r.setQueryOptions(q)
rtt, resp, err := conf.c.doRequest(r)
if err != nil {
return nil, nil, err
}
defer closeResponseBody(resp)
if err := requireOK(resp); err != nil {
return nil, nil, err
}
qm := &QueryMeta{}
parseQueryMeta(resp, qm)
qm.RequestTime = rtt
var raw []map[string]interface{}
if err := decodeBody(resp, &raw); err != nil {
return nil, nil, err
}
entries, err := decodeConfigEntrySlice(raw)
if err != nil {
return nil, nil, err
}
return entries, qm, nil
}
func (conf *ConfigEntries) Set(entry ConfigEntry, w *WriteOptions) (bool, *WriteMeta, error) {
return conf.set(entry, nil, w)
}
func (conf *ConfigEntries) CAS(entry ConfigEntry, index uint64, w *WriteOptions) (bool, *WriteMeta, error) {
return conf.set(entry, map[string]string{"cas": strconv.FormatUint(index, 10)}, w)
}
func (conf *ConfigEntries) set(entry ConfigEntry, params map[string]string, w *WriteOptions) (bool, *WriteMeta, error) {
r := conf.c.newRequest("PUT", "/v1/config")
r.setWriteOptions(w)
for param, value := range params {
r.params.Set(param, value)
}
r.obj = entry
rtt, resp, err := conf.c.doRequest(r)
if err != nil {
return false, nil, err
}
defer closeResponseBody(resp)
if err := requireOK(resp); err != nil {
return false, nil, err
}
var buf bytes.Buffer
if _, err := io.Copy(&buf, resp.Body); err != nil {
return false, nil, fmt.Errorf("Failed to read response: %v", err)
}
res := strings.Contains(buf.String(), "true")
wm := &WriteMeta{RequestTime: rtt}
return res, wm, nil
}
func (conf *ConfigEntries) Delete(kind string, name string, w *WriteOptions) (*WriteMeta, error) {
_, wm, err := conf.delete(kind, name, nil, w)
return wm, err
}
// DeleteCAS performs a Check-And-Set deletion of the given config entry, and
// returns true if it was successful. If the provided index no longer matches
// the entry's ModifyIndex (i.e. it was modified by another process) then the
// operation will fail and return false.
func (conf *ConfigEntries) DeleteCAS(kind, name string, index uint64, w *WriteOptions) (bool, *WriteMeta, error) {
return conf.delete(kind, name, map[string]string{"cas": strconv.FormatUint(index, 10)}, w)
}
func (conf *ConfigEntries) delete(kind, name string, params map[string]string, w *WriteOptions) (bool, *WriteMeta, error) {
if kind == "" || name == "" {
return false, nil, fmt.Errorf("Both kind and name parameters must not be empty")
}
r := conf.c.newRequest("DELETE", fmt.Sprintf("/v1/config/%s/%s", kind, name))
r.setWriteOptions(w)
for param, value := range params {
r.params.Set(param, value)
}
rtt, resp, err := conf.c.doRequest(r)
if err != nil {
return false, nil, err
}
defer closeResponseBody(resp)
if err := requireOK(resp); err != nil {
return false, nil, err
}
var buf bytes.Buffer
if _, err := io.Copy(&buf, resp.Body); err != nil {
return false, nil, fmt.Errorf("Failed to read response: %v", err)
}
res := strings.Contains(buf.String(), "true")
wm := &WriteMeta{RequestTime: rtt}
return res, wm, nil
}