package config import ( "crypto/tls" "fmt" "net" "reflect" "strings" "time" "github.com/hashicorp/consul/agent/structs" "github.com/hashicorp/consul/api" "github.com/hashicorp/consul/lib" "github.com/hashicorp/consul/tlsutil" "github.com/hashicorp/consul/types" "golang.org/x/time/rate" ) // RuntimeConfig specifies the configuration the consul agent actually // uses. Is is derived from one or more Config structures which can come // from files, flags and/or environment variables. type RuntimeConfig struct { // non-user configurable values AEInterval time.Duration // ACLDisabledTTL is used by clients to determine how long they will // wait to check again with the servers if they discover ACLs are not // enabled. (not user configurable) // // hcl: acl_disabled_ttl = "duration" ACLDisabledTTL time.Duration CheckDeregisterIntervalMin time.Duration CheckReapInterval time.Duration SegmentLimit int SegmentNameLimit int SyncCoordinateRateTarget float64 SyncCoordinateIntervalMin time.Duration Revision string Version string VersionPrerelease string // consul config ConsulCoordinateUpdateMaxBatches int ConsulCoordinateUpdateBatchSize int ConsulCoordinateUpdatePeriod time.Duration ConsulRaftElectionTimeout time.Duration ConsulRaftHeartbeatTimeout time.Duration ConsulRaftLeaderLeaseTimeout time.Duration ConsulServerHealthInterval time.Duration // ACLAgentMasterToken is a special token that has full read and write // privileges for this agent, and can be used to call agent endpoints // when no servers are available. // // hcl: acl_agent_master_token = string ACLAgentMasterToken string // ACLAgentToken is the default token used to make requests for the agent // itself, such as for registering itself with the catalog. If not // configured, the 'acl_token' will be used. // // hcl: acl_agent_token = string ACLAgentToken string // ACLDatacenter is the central datacenter that holds authoritative // ACL records. This must be the same for the entire cluster. // If this is not set, ACLs are not enabled. Off by default. // // hcl: acl_datacenter = string ACLDatacenter string // ACLDefaultPolicy is used to control the ACL interaction when // there is no defined policy. This can be "allow" which means // ACLs are used to black-list, or "deny" which means ACLs are // white-lists. // // hcl: acl_default_policy = ("allow"|"deny") ACLDefaultPolicy string // ACLDownPolicy is used to control the ACL interaction when we cannot // reach the ACLDatacenter and the token is not in the cache. // There are the following modes: // * allow - Allow all requests // * deny - Deny all requests // * extend-cache - Ignore the cache expiration, and allow cached // ACL's to be used to service requests. This // is the default. If the ACL is not in the cache, // this acts like deny. // * async-cache - Same behaviour as extend-cache, but perform ACL // Lookups asynchronously when cache TTL is expired. // // hcl: acl_down_policy = ("allow"|"deny"|"extend-cache"|"async-cache") ACLDownPolicy string // ACLEnforceVersion8 is used to gate a set of ACL policy features that // are opt-in prior to Consul 0.8 and opt-out in Consul 0.8 and later. // // hcl: acl_enforce_version_8 = (true|false) ACLEnforceVersion8 bool // ACLEnableKeyListPolicy is used to opt-in to the "list" policy added to // KV ACLs in Consul 1.0. // // See https://www.consul.io/docs/guides/acl.html#list-policy-for-keys for // more details. // // hcl: acl_enable_key_list_policy = (true|false) ACLEnableKeyListPolicy bool // ACLMasterToken is used to bootstrap the ACL system. It should be specified // on the servers in the ACLDatacenter. When the leader comes online, it ensures // that the Master token is available. This provides the initial token. // // hcl: acl_master_token = string ACLMasterToken string // ACLReplicationToken is used to fetch ACLs from the ACLDatacenter in // order to replicate them locally. Setting this to a non-empty value // also enables replication. Replication is only available in datacenters // other than the ACLDatacenter. // // hcl: acl_replication_token = string ACLReplicationToken string // ACLTTL is used to control the time-to-live of cached ACLs . This has // a major impact on performance. By default, it is set to 30 seconds. // // hcl: acl_ttl = "duration" ACLTTL time.Duration // ACLToken is the default token used to make requests if a per-request // token is not provided. If not configured the 'anonymous' token is used. // // hcl: acl_token = string ACLToken string // AutopilotCleanupDeadServers enables the automatic cleanup of dead servers when new ones // are added to the peer list. Defaults to true. // // hcl: autopilot { cleanup_dead_servers = (true|false) } AutopilotCleanupDeadServers bool // AutopilotDisableUpgradeMigration will disable Autopilot's upgrade migration // strategy of waiting until enough newer-versioned servers have been added to the // cluster before promoting them to voters. (Enterprise-only) // // hcl: autopilot { disable_upgrade_migration = (true|false) AutopilotDisableUpgradeMigration bool // AutopilotLastContactThreshold is the limit on the amount of time a server can go // without leader contact before being considered unhealthy. // // hcl: autopilot { last_contact_threshold = "duration" } AutopilotLastContactThreshold time.Duration // AutopilotMaxTrailingLogs is the amount of entries in the Raft Log that a server can // be behind before being considered unhealthy. The value must be positive. // // hcl: autopilot { max_trailing_logs = int } AutopilotMaxTrailingLogs int // AutopilotRedundancyZoneTag is the Meta tag to use for separating servers // into zones for redundancy. If left blank, this feature will be disabled. // (Enterprise-only) // // hcl: autopilot { redundancy_zone_tag = string } AutopilotRedundancyZoneTag string // AutopilotServerStabilizationTime is the minimum amount of time a server must be // in a stable, healthy state before it can be added to the cluster. Only // applicable with Raft protocol version 3 or higher. // // hcl: autopilot { server_stabilization_time = "duration" } AutopilotServerStabilizationTime time.Duration // AutopilotUpgradeVersionTag is the node tag to use for version info when // performing upgrade migrations. If left blank, the Consul version will be used. // // (Enterprise-only) // // hcl: autopilot { upgrade_version_tag = string } AutopilotUpgradeVersionTag string // DNSAllowStale is used to enable lookups with stale // data. This gives horizontal read scalability since // any Consul server can service the query instead of // only the leader. // // hcl: dns_config { allow_stale = (true|false) } DNSAllowStale bool // DNSARecordLimit is used to limit the maximum number of DNS Resource // Records returned in the ANSWER section of a DNS response for A or AAAA // records for both UDP and TCP queries. // // This is not normally useful and will be limited based on the querying // protocol, however systems that implemented §6 Rule 9 in RFC3484 // may want to set this to `1` in order to subvert §6 Rule 9 and // re-obtain the effect of randomized resource records (i.e. each // answer contains only one IP, but the IP changes every request). // RFC3484 sorts answers in a deterministic order, which defeats the // purpose of randomized DNS responses. This RFC has been obsoleted // by RFC6724 and restores the desired behavior of randomized // responses, however a large number of Linux hosts using glibc(3) // implemented §6 Rule 9 and may need this option (e.g. CentOS 5-6, // Debian Squeeze, etc). // // hcl: dns_config { a_record_limit = int } DNSARecordLimit int // DNSDisableCompression is used to control whether DNS responses are // compressed. In Consul 0.7 this was turned on by default and this // config was added as an opt-out. // // hcl: dns_config { disable_compression = (true|false) } DNSDisableCompression bool // DNSDomain is the DNS domain for the records. Should end with a dot. // Defaults to "consul." // // hcl: domain = string // flag: -domain string DNSDomain string // DNSEnableTruncate is used to enable setting the truncate // flag for UDP DNS queries. This allows unmodified // clients to re-query the consul server using TCP // when the total number of records exceeds the number // returned by default for UDP. // // hcl: dns_config { enable_truncate = (true|false) } DNSEnableTruncate bool // DNSMaxStale is used to bound how stale of a result is // accepted for a DNS lookup. This can be used with // AllowStale to limit how old of a value is served up. // If the stale result exceeds this, another non-stale // stale read is performed. // // hcl: dns_config { max_stale = "duration" } DNSMaxStale time.Duration // DNSNodeTTL provides the TTL value for a node query. // // hcl: dns_config { node_ttl = "duration" } DNSNodeTTL time.Duration // DNSOnlyPassing is used to determine whether to filter nodes // whose health checks are in any non-passing state. By // default, only nodes in a critical state are excluded. // // hcl: dns_config { only_passing = "duration" } DNSOnlyPassing bool // DNSRecursorTimeout specifies the timeout in seconds // for Consul's internal dns client used for recursion. // This value is used for the connection, read and write timeout. // // hcl: dns_config { recursor_timeout = "duration" } DNSRecursorTimeout time.Duration // DNSServiceTTL provides the TTL value for a service // query for given service. The "*" wildcard can be used // to set a default for all services. // // hcl: dns_config { service_ttl = map[string]"duration" } DNSServiceTTL map[string]time.Duration // DNSUDPAnswerLimit is used to limit the maximum number of DNS Resource // Records returned in the ANSWER section of a DNS response for UDP // responses without EDNS support (limited to 512 bytes). // This parameter is deprecated, if you want to limit the number of // records returned by A or AAAA questions, please use DNSARecordLimit // instead. // // hcl: dns_config { udp_answer_limit = int } DNSUDPAnswerLimit int // DNSNodeMetaTXT controls whether DNS queries will synthesize // TXT records for the node metadata and add them when not specifically // request (query type = TXT). If unset this will default to true DNSNodeMetaTXT bool // DNSRecursors can be set to allow the DNS servers to recursively // resolve non-consul domains. // // hcl: recursors = []string // flag: -recursor string [-recursor string] DNSRecursors []string // HTTPBlockEndpoints is a list of endpoint prefixes to block in the // HTTP API. Any requests to these will get a 403 response. // // hcl: http_config { block_endpoints = []string } HTTPBlockEndpoints []string // HTTPResponseHeaders are used to add HTTP header response fields to the HTTP API responses. // // hcl: http_config { response_headers = map[string]string } HTTPResponseHeaders map[string]string // Embed Telemetry Config Telemetry lib.TelemetryConfig // Datacenter is the datacenter this node is in. Defaults to "dc1". // // Datacenter is exposed via /v1/agent/self from here and // used in lots of places like CLI commands. Treat this as an interface // that must be stable. // // hcl: datacenter = string // flag: -datacenter string Datacenter string // Defines the maximum stale value for discovery path. Defauls to "0s". // Discovery paths are /v1/heath/ paths // // If not set to 0, it will try to perform stale read and perform only a // consistent read whenever the value is too old. // hcl: discovery_max_stale = "duration" DiscoveryMaxStale time.Duration // Node name is the name we use to advertise. Defaults to hostname. // // NodeName is exposed via /v1/agent/self from here and // used in lots of places like CLI commands. Treat this as an interface // that must be stable. // // hcl: node_name = string // flag: -node string NodeName string // AdvertiseAddrLAN is the address we use for advertising our Serf, and // Consul RPC IP. The address can be specified as an ip address or as a // go-sockaddr template which resolves to a single ip address. If not // specified, the bind address is used. // // hcl: advertise_addr = string AdvertiseAddrLAN *net.IPAddr // AdvertiseAddrWAN is the address we use for advertising our Serf, and // Consul RPC IP. The address can be specified as an ip address or as a // go-sockaddr template which resolves to a single ip address. If not // specified, the bind address is used. // // hcl: advertise_addr_wan = string AdvertiseAddrWAN *net.IPAddr // BindAddr is used to control the address we bind to. // If not specified, the first private IP we find is used. // This controls the address we use for cluster facing // services (Gossip, Server RPC) // // The value can be either an ip address or a go-sockaddr // template which resolves to a single ip address. // // hcl: bind_addr = string // flag: -bind string BindAddr *net.IPAddr // Bootstrap is used to bring up the first Consul server, and // permits that node to elect itself leader // // hcl: bootstrap = (true|false) // flag: -bootstrap Bootstrap bool // BootstrapExpect tries to automatically bootstrap the Consul cluster, by // having servers wait to bootstrap until enough servers join, and then // performing the bootstrap process automatically. They will disable their // automatic bootstrap process if they detect any servers that are part of // an existing cluster, so it's safe to leave this set to a non-zero value. // // hcl: bootstrap_expect = int // flag: -bootstrap-expect=int BootstrapExpect int // CAFile is a path to a certificate authority file. This is used with // VerifyIncoming or VerifyOutgoing to verify the TLS connection. // // hcl: ca_file = string CAFile string // CAPath is a path to a directory of certificate authority files. This is // used with VerifyIncoming or VerifyOutgoing to verify the TLS connection. // // hcl: ca_path = string CAPath string // CertFile is used to provide a TLS certificate that is used for serving // TLS connections. Must be provided to serve TLS connections. // // hcl: cert_file = string CertFile string // CheckUpdateInterval controls the interval on which the output of a health check // is updated if there is no change to the state. For example, a check in a steady // state may run every 5 second generating a unique output (timestamp, etc), forcing // constant writes. This allows Consul to defer the write for some period of time, // reducing the write pressure when the state is steady. // // See also: DiscardCheckOutput // // hcl: check_update_interval = "duration" CheckUpdateInterval time.Duration // Checks contains the provided check definitions. // // hcl: checks = [ // { // id = string // name = string // notes = string // service_id = string // token = string // status = string // script = string // args = string // http = string // header = map[string][]string // method = string // tcp = string // interval = string // docker_container_id = string // shell = string // tls_skip_verify = (true|false) // timeout = "duration" // ttl = "duration" // deregister_critical_service_after = "duration" // }, // ... // ] Checks []*structs.CheckDefinition // ClientAddrs contains the list of ip addresses the DNS, HTTP and HTTPS // endpoints will bind to if the endpoints are enabled (ports > 0) and the // addresses are not overwritten. // // The ip addresses must be provided as a space separated list of ip // addresses and go-sockaddr templates. // // Client addresses cannot contain UNIX socket addresses since a socket // cannot be shared across multiple endpoints (no ports). To use UNIX // sockets configure it in 'addresses'. // // hcl: client_addr = string // flag: -client string ClientAddrs []*net.IPAddr // ConnectEnabled opts the agent into connect. It should be set on all clients // and servers in a cluster for correct connect operation. ConnectEnabled bool // ConnectProxyBindMinPort is the inclusive start of the range of ports // allocated to the agent for starting proxy listeners on where no explicit // port is specified. ConnectProxyBindMinPort int // ConnectProxyBindMaxPort is the inclusive end of the range of ports // allocated to the agent for starting proxy listeners on where no explicit // port is specified. ConnectProxyBindMaxPort int // ConnectProxyAllowManagedRoot is true if Consul can execute managed // proxies when running as root (EUID == 0). ConnectProxyAllowManagedRoot bool // ConnectProxyAllowManagedAPIRegistration enables managed proxy registration // via the agent HTTP API. If this is false, only file configurations // can be used. ConnectProxyAllowManagedAPIRegistration bool // ConnectProxyDefaultExecMode is used where a registration doesn't include an // exec_mode. Defaults to daemon. ConnectProxyDefaultExecMode string // ConnectProxyDefaultDaemonCommand is used to start proxy in exec_mode = // daemon if not specified at registration time. ConnectProxyDefaultDaemonCommand []string // ConnectProxyDefaultScriptCommand is used to start proxy in exec_mode = // script if not specified at registration time. ConnectProxyDefaultScriptCommand []string // ConnectProxyDefaultConfig is merged with any config specified at // registration time to allow global control of defaults. ConnectProxyDefaultConfig map[string]interface{} // ConnectCAProvider is the type of CA provider to use with Connect. ConnectCAProvider string // ConnectCAConfig is the config to use for the CA provider. ConnectCAConfig map[string]interface{} // ConnectTestDisableManagedProxies is not exposed to public config but us // used by TestAgent to prevent self-executing the test binary in the // background if a managed proxy is created for a test. The only place we // actually want to test processes really being spun up and managed is in // `agent/proxy` and it does it at a lower level. Note that this still allows // registering managed proxies via API and other methods, and still creates // all the agent state for them, just doesn't actually start external // processes up. ConnectTestDisableManagedProxies bool // DNSAddrs contains the list of TCP and UDP addresses the DNS server will // bind to. If the DNS endpoint is disabled (ports.dns <= 0) the list is // empty. // // The ip addresses are taken from 'addresses.dns' which should contain a // space separated list of ip addresses and/or go-sockaddr templates. // // If 'addresses.dns' was not provided the 'client_addr' addresses are // used. // // The DNS server cannot be bound to UNIX sockets. // // hcl: client_addr = string addresses { dns = string } ports { dns = int } DNSAddrs []net.Addr // DNSPort is the port the DNS server listens on. The default is 8600. // Setting this to a value <= 0 disables the endpoint. // // hcl: ports { dns = int } // flags: -dns-port int DNSPort int // DataDir is the path to the directory where the local state is stored. // // hcl: data_dir = string // flag: -data-dir string DataDir string // DevMode enables a fast-path mode of operation to bring up an in-memory // server with minimal configuration. Useful for developing Consul. // // flag: -dev DevMode bool // DisableAnonymousSignature is used to turn off the anonymous signature // send with the update check. This is used to deduplicate messages. // // hcl: disable_anonymous_signature = (true|false) DisableAnonymousSignature bool // DisableCoordinates controls features related to network coordinates. // // hcl: disable_coordinates = (true|false) DisableCoordinates bool // DisableHostNodeID will prevent Consul from using information from the // host to generate a node ID, and will cause Consul to generate a // random ID instead. // // hcl: disable_host_node_id = (true|false) // flag: -disable-host-node-id DisableHostNodeID bool // DisableHTTPUnprintableCharFilter will bypass the filter preventing HTTP // URLs from containing unprintable chars. This filter was added in 1.0.3 as a // response to a vulnerability report. Disabling this is never recommended in // general however some users who have keys written in older versions of // Consul may use this to temporarily disable the filter such that they can // delete those keys again! We do not recommend leaving it disabled long term. // // hcl: disable_http_unprintable_char_filter DisableHTTPUnprintableCharFilter bool // DisableKeyringFile disables writing the keyring to a file. // // hcl: disable_keyring_file = (true|false) // flag: -disable-keyring-file DisableKeyringFile bool // DisableRemoteExec is used to turn off the remote execution // feature. This is for security to prevent unknown scripts from running. // // hcl: disable_remote_exec = (true|false) DisableRemoteExec bool // DisableUpdateCheck is used to turn off the automatic update and // security bulletin checking. // // hcl: disable_update_check = (true|false) DisableUpdateCheck bool // DiscardCheckOutput is used to turn off storing and comparing the // output of health checks. This reduces the write rate on the server // for checks with highly volatile output. (reloadable) // // See also: CheckUpdateInterval // // hcl: discard_check_output = (true|false) DiscardCheckOutput bool // EnableACLReplication is used to turn on ACL replication when using // /v1/agent/token/acl_replication_token to introduce the token, instead // of setting acl_replication_token in the config. Setting the token via // config will also set this to true for backward compatibility. // // hcl: enable_acl_replication = (true|false) // todo(fs): rename to ACLEnableReplication EnableACLReplication bool // EnableAgentTLSForChecks is used to apply the agent's TLS settings in // order to configure the HTTP client used for health checks. Enabling // this allows HTTP checks to present a client certificate and verify // the server using the same TLS configuration as the agent (CA, cert, // and key). EnableAgentTLSForChecks bool // EnableDebug is used to enable various debugging features. // // hcl: enable_debug = (true|false) EnableDebug bool // EnableScriptChecks controls whether health checks which execute // scripts are enabled. This includes regular script checks and Docker // checks. // // hcl: enable_script_checks = (true|false) // flag: -enable-script-checks EnableScriptChecks bool // EnableSyslog is used to also tee all the logs over to syslog. Only supported // on linux and OSX. Other platforms will generate an error. // // hcl: enable_syslog = (true|false) // flag: -syslog EnableSyslog bool // EnableUI enables the statically-compiled assets for the Consul web UI and // serves them at the default /ui/ endpoint automatically. // // hcl: enable_ui = (true|false) // flag: -ui EnableUI bool // EncryptKey contains the encryption key to use for the Serf communication. // // hcl: encrypt = string // flag: -encrypt string EncryptKey string // EncryptVerifyIncoming enforces incoming gossip encryption and can be // used to upshift to encrypted gossip on a running cluster. // // hcl: encrypt_verify_incoming = (true|false) EncryptVerifyIncoming bool // EncryptVerifyOutgoing enforces outgoing gossip encryption and can be // used to upshift to encrypted gossip on a running cluster. // // hcl: encrypt_verify_outgoing = (true|false) EncryptVerifyOutgoing bool // HTTPAddrs contains the list of TCP addresses and UNIX sockets the HTTP // server will bind to. If the HTTP endpoint is disabled (ports.http <= 0) // the list is empty. // // The addresses are taken from 'addresses.http' which should contain a // space separated list of ip addresses, UNIX socket paths and/or // go-sockaddr templates. UNIX socket paths must be written as // 'unix://', e.g. 'unix:///var/run/consul-http.sock'. // // If 'addresses.http' was not provided the 'client_addr' addresses are // used. // // hcl: client_addr = string addresses { http = string } ports { http = int } HTTPAddrs []net.Addr // HTTPPort is the port the HTTP server listens on. The default is 8500. // Setting this to a value <= 0 disables the endpoint. // // hcl: ports { http = int } // flags: -http-port int HTTPPort int // HTTPSAddrs contains the list of TCP addresses and UNIX sockets the HTTPS // server will bind to. If the HTTPS endpoint is disabled (ports.https <= // 0) the list is empty. // // The addresses are taken from 'addresses.https' which should contain a // space separated list of ip addresses, UNIX socket paths and/or // go-sockaddr templates. UNIX socket paths must be written as // 'unix://', e.g. 'unix:///var/run/consul-https.sock'. // // If 'addresses.https' was not provided the 'client_addr' addresses are // used. // // hcl: client_addr = string addresses { https = string } ports { https = int } HTTPSAddrs []net.Addr // HTTPSPort is the port the HTTP server listens on. The default is -1. // Setting this to a value <= 0 disables the endpoint. // // hcl: ports { https = int } HTTPSPort int // KeyFile is used to provide a TLS key that is used for serving TLS // connections. Must be provided to serve TLS connections. // // hcl: key_file = string KeyFile string // LeaveDrainTime is used to wait after a server has left the LAN Serf // pool for RPCs to drain and new requests to be sent to other servers. // // hcl: performance { leave_drain_time = "duration" } LeaveDrainTime time.Duration // LeaveOnTerm controls if Serf does a graceful leave when receiving // the TERM signal. Defaults true on clients, false on servers. (reloadable) // // hcl: leave_on_terminate = (true|false) LeaveOnTerm bool // LogLevel is the level of the logs to write. Defaults to "INFO". // // hcl: log_level = string LogLevel string // Node ID is a unique ID for this node across space and time. Defaults // to a randomly-generated ID that persists in the data-dir. // // todo(fs): don't we have a requirement for this to be a UUID in a specific format? // // hcl: node_id = string // flag: -node-id string NodeID types.NodeID // NodeMeta contains metadata key/value pairs. These are excluded from JSON output // because they can be reloaded and might be stale when shown from the // config instead of the local state. // todo(fs): should the sanitizer omit them from output as well since they could be stale? // // hcl: node_meta = map[string]string // flag: -node-meta "key:value" -node-meta "key:value" ... NodeMeta map[string]string // NonVotingServer is whether this server will act as a non-voting member // of the cluster to help provide read scalability. (Enterprise-only) // // hcl: non_voting_server = (true|false) // flag: -non-voting-server NonVotingServer bool // PidFile is the file to store our PID in. // // hcl: pid_file = string PidFile string // RPCAdvertiseAddr is the TCP address Consul advertises for its RPC endpoint. // By default this is the bind address on the default RPC Server port. If the // advertise address is specified then it is used. // // hcl: bind_addr = string advertise_addr = string ports { server = int } RPCAdvertiseAddr *net.TCPAddr // RPCBindAddr is the TCP address Consul will bind to for its RPC endpoint. // By default this is the bind address on the default RPC Server port. // // hcl: bind_addr = string ports { server = int } RPCBindAddr *net.TCPAddr // RPCHoldTimeout is how long an RPC can be "held" before it is errored. // This is used to paper over a loss of leadership by instead holding RPCs, // so that the caller experiences a slow response rather than an error. // This period is meant to be long enough for a leader election to take // place, and a small jitter is applied to avoid a thundering herd. // // hcl: performance { rpc_hold_timeout = "duration" } RPCHoldTimeout time.Duration // RPCRateLimit and RPCMaxBurst control how frequently RPC calls are allowed // to happen. In any large enough time interval, rate limiter limits the // rate to RPCRate tokens per second, with a maximum burst size of // RPCMaxBurst events. As a special case, if RPCRate == Inf (the infinite // rate), RPCMaxBurst is ignored. // // See https://en.wikipedia.org/wiki/Token_bucket for more about token // buckets. // // hcl: limit { rpc_rate = (float64|MaxFloat64) rpc_max_burst = int } RPCRateLimit rate.Limit RPCMaxBurst int // RPCProtocol is the Consul protocol version to use. // // hcl: protocol = int RPCProtocol int // RaftProtocol sets the Raft protocol version to use on this server. // Defaults to 3. // // hcl: raft_protocol = int RaftProtocol int // RaftSnapshotThreshold sets the minimum threshold of raft commits after which // a snapshot is created. Defaults to 8192 // // hcl: raft_snapshot_threshold = int RaftSnapshotThreshold int // RaftSnapshotInterval sets the interval to use when checking whether to create // a new snapshot. Defaults to 5 seconds. // hcl: raft_snapshot_threshold = int RaftSnapshotInterval time.Duration // ReconnectTimeoutLAN specifies the amount of time to wait to reconnect with // another agent before deciding it's permanently gone. This can be used to // control the time it takes to reap failed nodes from the cluster. // // hcl: reconnect_timeout = "duration" ReconnectTimeoutLAN time.Duration // ReconnectTimeoutWAN specifies the amount of time to wait to reconnect with // another agent before deciding it's permanently gone. This can be used to // control the time it takes to reap failed nodes from the cluster. // // hcl: reconnect_timeout = "duration" ReconnectTimeoutWAN time.Duration // RejoinAfterLeave controls our interaction with the cluster after leave. // When set to false (default), a leave causes Consul to not rejoin // the cluster until an explicit join is received. If this is set to // true, we ignore the leave, and rejoin the cluster on start. // // hcl: rejoin_after_leave = (true|false) // flag: -rejoin RejoinAfterLeave bool // RetryJoinIntervalLAN specifies the amount of time to wait in between join // attempts on agent start. The minimum allowed value is 1 second and // the default is 30s. // // hcl: retry_join = "duration" RetryJoinIntervalLAN time.Duration // RetryJoinIntervalWAN specifies the amount of time to wait in between join // attempts on agent start. The minimum allowed value is 1 second and // the default is 30s. // // hcl: retry_join_wan = "duration" RetryJoinIntervalWAN time.Duration // RetryJoinLAN is a list of addresses and/or go-discover expressions to // join with retry enabled. See // https://www.consul.io/docs/agent/options.html#cloud-auto-joining for // details. // // hcl: retry_join = []string // flag: -retry-join string -retry-join string RetryJoinLAN []string // RetryJoinMaxAttemptsLAN specifies the maximum number of times to retry // joining a host on startup. This is useful for cases where we know the // node will be online eventually. // // hcl: retry_max = int // flag: -retry-max int RetryJoinMaxAttemptsLAN int // RetryJoinMaxAttemptsWAN specifies the maximum number of times to retry // joining a host on startup. This is useful for cases where we know the // node will be online eventually. // // hcl: retry_max_wan = int // flag: -retry-max-wan int RetryJoinMaxAttemptsWAN int // RetryJoinWAN is a list of addresses and/or go-discover expressions to // join -wan with retry enabled. See // https://www.consul.io/docs/agent/options.html#cloud-auto-joining for // details. // // hcl: retry_join_wan = []string // flag: -retry-join-wan string -retry-join-wan string RetryJoinWAN []string // SegmentName is the network segment for this client to join. // (Enterprise-only) // // hcl: segment = string SegmentName string // Segments is the list of network segments for this server to // initialize. // // hcl: segment = [ // { // # name is the name of the segment // name = string // // # bind is the bind ip address for this segment. // bind = string // // # port is the bind port for this segment. // port = int // // # advertise is the advertise ip address for this segment. // # Defaults to the bind address if not set. // advertise = string // // # rpc_listener controls whether or not to bind a separate // # RPC listener to the bind address. // rpc_listener = (true|false) // }, // ... // ] Segments []structs.NetworkSegment // SerfAdvertiseAddrLAN is the TCP address which is used for advertising // the LAN Gossip pool for both client and server. The address is the // combination of AdvertiseAddrLAN and the SerfPortLAN. If the advertise // address is not given the bind address is used. // // hcl: bind_addr = string advertise_addr = string ports { serf_lan = int } SerfAdvertiseAddrLAN *net.TCPAddr // SerfAdvertiseAddrWAN is the TCP address which is used for advertising // the WAN Gossip pool on the server only. The address is the combination // of AdvertiseAddrWAN and the SerfPortWAN. If the advertise address is not // given the bind address is used. // // hcl: bind_addr = string advertise_addr_wan = string ports { serf_wan = int } SerfAdvertiseAddrWAN *net.TCPAddr // SerfBindAddrLAN is the address to bind the Serf LAN TCP and UDP // listeners to. The ip address is either the default bind address or the // 'serf_lan' address which can be either an ip address or a go-sockaddr // template which resolves to a single ip address. // // hcl: bind_addr = string serf_lan = string ports { serf_lan = int } // flag: -serf-lan string SerfBindAddrLAN *net.TCPAddr // SerfBindAddrWAN is the address to bind the Serf WAN TCP and UDP // listeners to. The ip address is either the default bind address or the // 'serf_wan' address which can be either an ip address or a go-sockaddr // template which resolves to a single ip address. // // hcl: bind_addr = string serf_wan = string ports { serf_wan = int } // flag: -serf-wan string SerfBindAddrWAN *net.TCPAddr // SerfPortLAN is the port used for the LAN Gossip pool for both client and server. // The default is 8301. // // hcl: ports { serf_lan = int } SerfPortLAN int // SerfPortWAN is the port used for the WAN Gossip pool for the server only. // The default is 8302. // // hcl: ports { serf_wan = int } SerfPortWAN int // GossipLANGossipInterval is the interval between sending messages that need // to be gossiped that haven't been able to piggyback on probing messages. // If this is set to zero, non-piggyback gossip is disabled. By lowering // this value (more frequent) gossip messages are propagated across // the cluster more quickly at the expense of increased bandwidth. This // configuration only applies to LAN gossip communications // // The default is: 200ms // // hcl: gossip_lan { gossip_interval = duration} GossipLANGossipInterval time.Duration // GossipLANGossipNodes is the number of random nodes to send gossip messages to // per GossipInterval. Increasing this number causes the gossip messages to // propagate across the cluster more quickly at the expense of increased // bandwidth. This configuration only applies to LAN gossip communications // // The default is: 3 // // hcl: gossip_lan { gossip_nodes = int } GossipLANGossipNodes int // GossipLANProbeInterval is the interval between random node probes. Setting // this lower (more frequent) will cause the memberlist cluster to detect // failed nodes more quickly at the expense of increased bandwidth usage. // This configuration only applies to LAN gossip communications // // The default is: 1s // // hcl: gossip_lan { probe_interval = duration } GossipLANProbeInterval time.Duration // GossipLANProbeTimeout is the timeout to wait for an ack from a probed node // before assuming it is unhealthy. This should be set to 99-percentile // of RTT (round-trip time) on your network. This configuration // only applies to the LAN gossip communications // // The default is: 500ms // // hcl: gossip_lan { probe_timeout = duration } GossipLANProbeTimeout time.Duration // GossipLANSuspicionMult is the multiplier for determining the time an // inaccessible node is considered suspect before declaring it dead. This // configuration only applies to LAN gossip communications // // The actual timeout is calculated using the formula: // // SuspicionTimeout = SuspicionMult * log(N+1) * ProbeInterval // // This allows the timeout to scale properly with expected propagation // delay with a larger cluster size. The higher the multiplier, the longer // an inaccessible node is considered part of the cluster before declaring // it dead, giving that suspect node more time to refute if it is indeed // still alive. // // The default is: 4 // // hcl: gossip_lan { suspicion_mult = int } GossipLANSuspicionMult int // GossipLANRetransmitMult is the multiplier for the number of retransmissions // that are attempted for messages broadcasted over gossip. This // configuration only applies to LAN gossip communications. The actual // count of retransmissions is calculated using the formula: // // Retransmits = RetransmitMult * log(N+1) // // This allows the retransmits to scale properly with cluster size. The // higher the multiplier, the more likely a failed broadcast is to converge // at the expense of increased bandwidth. // // The default is: 4 // // hcl: gossip_lan { retransmit_mult = int } GossipLANRetransmitMult int // GossipWANGossipInterval is the interval between sending messages that need // to be gossiped that haven't been able to piggyback on probing messages. // If this is set to zero, non-piggyback gossip is disabled. By lowering // this value (more frequent) gossip messages are propagated across // the cluster more quickly at the expense of increased bandwidth. This // configuration only applies to WAN gossip communications // // The default is: 200ms // // hcl: gossip_wan { gossip_interval = duration} GossipWANGossipInterval time.Duration // GossipWANGossipNodes is the number of random nodes to send gossip messages to // per GossipInterval. Increasing this number causes the gossip messages to // propagate across the cluster more quickly at the expense of increased // bandwidth. This configuration only applies to WAN gossip communications // // The default is: 3 // // hcl: gossip_wan { gossip_nodes = int } GossipWANGossipNodes int // GossipWANProbeInterval is the interval between random node probes. Setting // this lower (more frequent) will cause the memberlist cluster to detect // failed nodes more quickly at the expense of increased bandwidth usage. // This configuration only applies to WAN gossip communications // // The default is: 1s // // hcl: gossip_wan { probe_interval = duration } GossipWANProbeInterval time.Duration // GossipWANProbeTimeout is the timeout to wait for an ack from a probed node // before assuming it is unhealthy. This should be set to 99-percentile // of RTT (round-trip time) on your network. This configuration // only applies to the WAN gossip communications // // The default is: 500ms // // hcl: gossip_wan { probe_timeout = duration } GossipWANProbeTimeout time.Duration // GossipWANSuspicionMult is the multiplier for determining the time an // inaccessible node is considered suspect before declaring it dead. This // configuration only applies to WAN gossip communications // // The actual timeout is calculated using the formula: // // SuspicionTimeout = SuspicionMult * log(N+1) * ProbeInterval // // This allows the timeout to scale properly with expected propagation // delay with a larger cluster size. The higher the multiplier, the longer // an inaccessible node is considered part of the cluster before declaring // it dead, giving that suspect node more time to refute if it is indeed // still alive. // // The default is: 4 // // hcl: gossip_wan { suspicion_mult = int } GossipWANSuspicionMult int // GossipWANRetransmitMult is the multiplier for the number of retransmissions // that are attempted for messages broadcasted over gossip. This // configuration only applies to WAN gossip communications. The actual // count of retransmissions is calculated using the formula: // // Retransmits = RetransmitMult * log(N+1) // // This allows the retransmits to scale properly with cluster size. The // higher the multiplier, the more likely a failed broadcast is to converge // at the expense of increased bandwidth. // // The default is: 4 // // hcl: gossip_wan { retransmit_mult = int } GossipWANRetransmitMult int // ServerMode controls if this agent acts like a Consul server, // or merely as a client. Servers have more state, take part // in leader election, etc. // // hcl: server = (true|false) // flag: -server ServerMode bool // ServerName is used with the TLS certificates to ensure the name we // provide matches the certificate. // // hcl: server_name = string ServerName string // ServerPort is the port the RPC server will bind to. // The default is 8300. // // hcl: ports { server = int } ServerPort int // Services contains the provided service definitions: // // hcl: services = [ // { // id = string // name = string // tags = []string // address = string // check = { check definition } // checks = [ { check definition}, ... ] // token = string // enable_tag_override = (true|false) // }, // ... // ] Services []*structs.ServiceDefinition // Minimum Session TTL. // // hcl: session_ttl_min = "duration" SessionTTLMin time.Duration // SkipLeaveOnInt controls if Serf skips a graceful leave when // receiving the INT signal. Defaults false on clients, true on // servers. (reloadable) // // hcl: skip_leave_on_interrupt = (true|false) SkipLeaveOnInt bool // StartJoinLAN is a list of addresses to attempt to join -wan when the // agent starts. If Serf is unable to communicate with any of these // addresses, then the agent will error and exit. // // hcl: start_join = []string // flag: -join string -join string StartJoinAddrsLAN []string // StartJoinWAN is a list of addresses to attempt to join -wan when the // agent starts. If Serf is unable to communicate with any of these // addresses, then the agent will error and exit. // // hcl: start_join_wan = []string // flag: -join-wan string -join-wan string StartJoinAddrsWAN []string // SyslogFacility is used to control where the syslog messages go // By default, goes to LOCAL0 // // hcl: syslog_facility = string SyslogFacility string // TLSCipherSuites is used to specify the list of supported ciphersuites. // // The values should be a list of the following values: // // TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305 // TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305 // TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 // TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 // TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 // TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 // TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 // TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA // TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 // TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA // TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA // TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA // TLS_RSA_WITH_AES_128_GCM_SHA256 // TLS_RSA_WITH_AES_256_GCM_SHA384 // TLS_RSA_WITH_AES_128_CBC_SHA256 // TLS_RSA_WITH_AES_128_CBC_SHA // TLS_RSA_WITH_AES_256_CBC_SHA // TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA // TLS_RSA_WITH_3DES_EDE_CBC_SHA // TLS_RSA_WITH_RC4_128_SHA // TLS_ECDHE_RSA_WITH_RC4_128_SHA // TLS_ECDHE_ECDSA_WITH_RC4_128_SHA // // todo(fs): IMHO, we should also support the raw 0xNNNN values from // todo(fs): https://golang.org/pkg/crypto/tls/#pkg-constants // todo(fs): since they are standardized by IANA. // // hcl: tls_cipher_suites = []string TLSCipherSuites []uint16 // TLSMinVersion is used to set the minimum TLS version used for TLS // connections. Should be either "tls10", "tls11", or "tls12". // // hcl: tls_min_version = string TLSMinVersion string // TLSPreferServerCipherSuites specifies whether to prefer the server's // cipher suite over the client cipher suites. // // hcl: tls_prefer_server_cipher_suites = (true|false) TLSPreferServerCipherSuites bool // TaggedAddresses are used to publish a set of addresses for // for a node, which can be used by the remote agent. We currently // populate only the "wan" tag based on the SerfWan advertise address, // but this structure is here for possible future features with other // user-defined tags. The "wan" tag will be used by remote agents if // they are configured with TranslateWANAddrs set to true. // // hcl: tagged_addresses = map[string]string TaggedAddresses map[string]string // TranslateWANAddrs controls whether or not Consul should prefer // the "wan" tagged address when doing lookups in remote datacenters. // See TaggedAddresses below for more details. // // hcl: translate_wan_addrs = (true|false) TranslateWANAddrs bool // UIDir is the directory containing the Web UI resources. // If provided, the UI endpoints will be enabled. // // hcl: ui_dir = string // flag: -ui-dir string UIDir string // UnixSocketGroup contains the group of the file permissions when // Consul binds to UNIX sockets. // // hcl: unix_sockets { group = string } UnixSocketGroup string // UnixSocketMode contains the mode of the file permissions when // Consul binds to UNIX sockets. // // hcl: unix_sockets { mode = string } UnixSocketMode string // UnixSocketUser contains the user of the file permissions when // Consul binds to UNIX sockets. // // hcl: unix_sockets { user = string } UnixSocketUser string // VerifyIncoming is used to verify the authenticity of incoming // connections. This means that TCP requests are forbidden, only allowing // for TLS. TLS connections must match a provided certificate authority. // This can be used to force client auth. // // hcl: verify_incoming = (true|false) VerifyIncoming bool // VerifyIncomingHTTPS is used to verify the authenticity of incoming HTTPS // connections. This means that TCP requests are forbidden, only allowing // for TLS. TLS connections must match a provided certificate authority. // This can be used to force client auth. // // hcl: verify_incoming_https = (true|false) VerifyIncomingHTTPS bool // VerifyIncomingRPC is used to verify the authenticity of incoming RPC // connections. This means that TCP requests are forbidden, only allowing // for TLS. TLS connections must match a provided certificate authority. // This can be used to force client auth. // // hcl: verify_incoming_rpc = (true|false) VerifyIncomingRPC bool // VerifyOutgoing is used to verify the authenticity of outgoing // connections. This means that TLS requests are used. TLS connections must // match a provided certificate authority. This is used to verify // authenticity of server nodes. // // hcl: verify_outgoing = (true|false) VerifyOutgoing bool // VerifyServerHostname is used to enable hostname verification of servers. // This ensures that the certificate presented is valid for // server... This prevents a compromised client from // being restarted as a server, and then intercepting request traffic as // well as being added as a raft peer. This should be enabled by default // with VerifyOutgoing, but for legacy reasons we cannot break existing // clients. // // hcl: verify_server_hostname = (true|false) VerifyServerHostname bool // Watches are used to monitor various endpoints and to invoke a // handler to act appropriately. These are managed entirely in the // agent layer using the standard APIs. // // See https://www.consul.io/docs/agent/watches.html for details. // // hcl: watches = [ // { type=string ... }, // { type=string ... }, // ... // ] // Watches []map[string]interface{} } // IncomingHTTPSConfig returns the TLS configuration for HTTPS // connections to consul. func (c *RuntimeConfig) IncomingHTTPSConfig() (*tls.Config, error) { tc := &tlsutil.Config{ VerifyIncoming: c.VerifyIncoming || c.VerifyIncomingHTTPS, VerifyOutgoing: c.VerifyOutgoing, CAFile: c.CAFile, CAPath: c.CAPath, CertFile: c.CertFile, KeyFile: c.KeyFile, NodeName: c.NodeName, ServerName: c.ServerName, TLSMinVersion: c.TLSMinVersion, CipherSuites: c.TLSCipherSuites, PreferServerCipherSuites: c.TLSPreferServerCipherSuites, } return tc.IncomingTLSConfig() } func (c *RuntimeConfig) apiAddresses(maxPerType int) (unixAddrs, httpAddrs, httpsAddrs []string) { if len(c.HTTPSAddrs) > 0 { for i, addr := range c.HTTPSAddrs { if maxPerType < 1 || i < maxPerType { httpsAddrs = append(httpsAddrs, addr.String()) } else { break } } } if len(c.HTTPAddrs) > 0 { unix_count := 0 http_count := 0 for _, addr := range c.HTTPAddrs { switch addr.(type) { case *net.UnixAddr: if maxPerType < 1 || unix_count < maxPerType { unixAddrs = append(unixAddrs, addr.String()) unix_count += 1 } default: if maxPerType < 1 || http_count < maxPerType { httpAddrs = append(httpAddrs, addr.String()) http_count += 1 } } } } return } func (c *RuntimeConfig) ClientAddress() (unixAddr, httpAddr, httpsAddr string) { unixAddrs, httpAddrs, httpsAddrs := c.apiAddresses(0) if len(unixAddrs) > 0 { unixAddr = "unix://" + unixAddrs[0] } http_any := "" if len(httpAddrs) > 0 { for _, addr := range httpAddrs { host, port, err := net.SplitHostPort(addr) if err != nil { continue } if host == "0.0.0.0" || host == "::" { if http_any == "" { if host == "0.0.0.0" { http_any = net.JoinHostPort("127.0.0.1", port) } else { http_any = net.JoinHostPort("::1", port) } } continue } httpAddr = addr break } if httpAddr == "" && http_any != "" { httpAddr = http_any } } https_any := "" if len(httpsAddrs) > 0 { for _, addr := range httpsAddrs { host, port, err := net.SplitHostPort(addr) if err != nil { continue } if host == "0.0.0.0" || host == "::" { if https_any == "" { if host == "0.0.0.0" { https_any = net.JoinHostPort("127.0.0.1", port) } else { https_any = net.JoinHostPort("::1", port) } } continue } httpsAddr = addr break } if httpsAddr == "" && https_any != "" { httpsAddr = https_any } } return } func (c *RuntimeConfig) APIConfig(includeClientCerts bool) (*api.Config, error) { cfg := &api.Config{ Datacenter: c.Datacenter, TLSConfig: api.TLSConfig{InsecureSkipVerify: !c.VerifyOutgoing}, } unixAddr, httpAddr, httpsAddr := c.ClientAddress() if httpsAddr != "" { cfg.Address = httpsAddr cfg.Scheme = "https" cfg.TLSConfig.CAFile = c.CAFile cfg.TLSConfig.CAPath = c.CAPath cfg.TLSConfig.Address = httpsAddr if includeClientCerts { cfg.TLSConfig.CertFile = c.CertFile cfg.TLSConfig.KeyFile = c.KeyFile } } else if httpAddr != "" { cfg.Address = httpAddr cfg.Scheme = "http" } else if unixAddr != "" { cfg.Address = unixAddr // this should be ignored - however we are still talking http over a unix socket // so it makes sense to set it like this cfg.Scheme = "http" } else { return nil, fmt.Errorf("No suitable client address can be found") } return cfg, nil } // Sanitized returns a JSON/HCL compatible representation of the runtime // configuration where all fields with potential secrets had their // values replaced by 'hidden'. In addition, network addresses and // time.Duration values are formatted to improve readability. func (c *RuntimeConfig) Sanitized() map[string]interface{} { return sanitize("rt", reflect.ValueOf(c)).Interface().(map[string]interface{}) } // isSecret determines whether a field name represents a field which // may contain a secret. func isSecret(name string) bool { name = strings.ToLower(name) return strings.Contains(name, "key") || strings.Contains(name, "token") || strings.Contains(name, "secret") } // cleanRetryJoin sanitizes the go-discover config strings key=val key=val... // by scrubbing the individual key=val combinations. func cleanRetryJoin(a string) string { var fields []string for _, f := range strings.Fields(a) { if isSecret(f) { kv := strings.SplitN(f, "=", 2) fields = append(fields, kv[0]+"=hidden") } else { fields = append(fields, f) } } return strings.Join(fields, " ") } func sanitize(name string, v reflect.Value) reflect.Value { typ := v.Type() switch { // check before isStruct and isPtr case isNetAddr(typ): if v.IsNil() { return reflect.ValueOf("") } switch x := v.Interface().(type) { case *net.TCPAddr: return reflect.ValueOf("tcp://" + x.String()) case *net.UDPAddr: return reflect.ValueOf("udp://" + x.String()) case *net.UnixAddr: return reflect.ValueOf("unix://" + x.String()) case *net.IPAddr: return reflect.ValueOf(x.IP.String()) default: return v } // check before isNumber case isDuration(typ): x := v.Interface().(time.Duration) return reflect.ValueOf(x.String()) case isString(typ): if strings.HasPrefix(name, "RetryJoinLAN[") || strings.HasPrefix(name, "RetryJoinWAN[") { x := v.Interface().(string) return reflect.ValueOf(cleanRetryJoin(x)) } if isSecret(name) { return reflect.ValueOf("hidden") } return v case isNumber(typ) || isBool(typ): return v case isPtr(typ): if v.IsNil() { return v } return sanitize(name, v.Elem()) case isStruct(typ): m := map[string]interface{}{} for i := 0; i < typ.NumField(); i++ { key := typ.Field(i).Name m[key] = sanitize(key, v.Field(i)).Interface() } return reflect.ValueOf(m) case isArray(typ) || isSlice(typ): ma := make([]interface{}, 0) for i := 0; i < v.Len(); i++ { ma = append(ma, sanitize(fmt.Sprintf("%s[%d]", name, i), v.Index(i)).Interface()) } return reflect.ValueOf(ma) case isMap(typ): m := map[string]interface{}{} for _, k := range v.MapKeys() { key := k.String() m[key] = sanitize(key, v.MapIndex(k)).Interface() } return reflect.ValueOf(m) default: return v } } func isDuration(t reflect.Type) bool { return t == reflect.TypeOf(time.Second) } func isMap(t reflect.Type) bool { return t.Kind() == reflect.Map } func isNetAddr(t reflect.Type) bool { return t.Implements(reflect.TypeOf((*net.Addr)(nil)).Elem()) } func isPtr(t reflect.Type) bool { return t.Kind() == reflect.Ptr } func isArray(t reflect.Type) bool { return t.Kind() == reflect.Array } func isSlice(t reflect.Type) bool { return t.Kind() == reflect.Slice } func isString(t reflect.Type) bool { return t.Kind() == reflect.String } func isStruct(t reflect.Type) bool { return t.Kind() == reflect.Struct } func isBool(t reflect.Type) bool { return t.Kind() == reflect.Bool } func isNumber(t reflect.Type) bool { return isInt(t) || isUint(t) || isFloat(t) || isComplex(t) } func isInt(t reflect.Type) bool { return t.Kind() == reflect.Int || t.Kind() == reflect.Int8 || t.Kind() == reflect.Int16 || t.Kind() == reflect.Int32 || t.Kind() == reflect.Int64 } func isUint(t reflect.Type) bool { return t.Kind() == reflect.Uint || t.Kind() == reflect.Uint8 || t.Kind() == reflect.Uint16 || t.Kind() == reflect.Uint32 || t.Kind() == reflect.Uint64 } func isFloat(t reflect.Type) bool { return t.Kind() == reflect.Float32 || t.Kind() == reflect.Float64 } func isComplex(t reflect.Type) bool { return t.Kind() == reflect.Complex64 || t.Kind() == reflect.Complex128 }