package agent import ( "encoding/base64" "encoding/json" "fmt" "io" "net" "os" "path/filepath" "sort" "strings" "time" "github.com/hashicorp/consul/consul" "github.com/hashicorp/consul/lib" "github.com/hashicorp/consul/watch" "github.com/mitchellh/mapstructure" ) // Ports is used to simplify the configuration by // providing default ports, and allowing the addresses // to only be specified once type PortConfig struct { DNS int // DNS Query interface HTTP int // HTTP API HTTPS int // HTTPS API RPC int // CLI RPC SerfLan int `mapstructure:"serf_lan"` // LAN gossip (Client + Server) SerfWan int `mapstructure:"serf_wan"` // WAN gossip (Server only) Server int // Server internal RPC } // AddressConfig is used to provide address overrides // for specific services. By default, either ClientAddress // or ServerAddress is used. type AddressConfig struct { DNS string // DNS Query interface HTTP string // HTTP API HTTPS string // HTTPS API RPC string // CLI RPC } type AdvertiseAddrsConfig struct { SerfLan *net.TCPAddr `mapstructure:"-"` SerfLanRaw string `mapstructure:"serf_lan"` SerfWan *net.TCPAddr `mapstructure:"-"` SerfWanRaw string `mapstructure:"serf_wan"` RPC *net.TCPAddr `mapstructure:"-"` RPCRaw string `mapstructure:"rpc"` } // DNSConfig is used to fine tune the DNS sub-system. // It can be used to control cache values, and stale // reads type DNSConfig struct { // NodeTTL provides the TTL value for a node query NodeTTL time.Duration `mapstructure:"-"` NodeTTLRaw string `mapstructure:"node_ttl" json:"-"` // ServiceTTL provides the TTL value for a service // query for given service. The "*" wildcard can be used // to set a default for all services. ServiceTTL map[string]time.Duration `mapstructure:"-"` ServiceTTLRaw map[string]string `mapstructure:"service_ttl" json:"-"` // AllowStale 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. AllowStale bool `mapstructure:"allow_stale"` // EnableTruncate 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. EnableTruncate bool `mapstructure:"enable_truncate"` // UDPAnswerLimit is used to limit the maximum number of DNS Resource // Records returned in the ANSWER section of a DNS response. 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). UDPAnswerLimit int `mapstructure:"udp_answer_limit"` // MaxStale 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. MaxStale time.Duration `mapstructure:"-"` MaxStaleRaw string `mapstructure:"max_stale" json:"-"` // OnlyPassing 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. OnlyPassing bool `mapstructure:"only_passing"` // DisableCompression 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. DisableCompression bool `mapstructure:"disable_compression"` } // Performance is used to tune the performance of Consul's subsystems. type Performance struct { // RaftMultiplier is an integer multiplier used to scale Raft timing // parameters: HeartbeatTimeout, ElectionTimeout, and LeaderLeaseTimeout. RaftMultiplier uint `mapstructure:"raft_multiplier"` } // Telemetry is the telemetry configuration for the server type Telemetry struct { // StatsiteAddr is the address of a statsite instance. If provided, // metrics will be streamed to that instance. StatsiteAddr string `mapstructure:"statsite_address"` // StatsdAddr is the address of a statsd instance. If provided, // metrics will be sent to that instance. StatsdAddr string `mapstructure:"statsd_address"` // StatsitePrefix is the prefix used to write stats values to. By // default this is set to 'consul'. StatsitePrefix string `mapstructure:"statsite_prefix"` // DisableHostname will disable hostname prefixing for all metrics DisableHostname bool `mapstructure:"disable_hostname"` // DogStatsdAddr is the address of a dogstatsd instance. If provided, // metrics will be sent to that instance DogStatsdAddr string `mapstructure:"dogstatsd_addr"` // DogStatsdTags are the global tags that should be sent with each packet to dogstatsd // It is a list of strings, where each string looks like "my_tag_name:my_tag_value" DogStatsdTags []string `mapstructure:"dogstatsd_tags"` // Circonus: see https://github.com/circonus-labs/circonus-gometrics // for more details on the various configuration options. // Valid configuration combinations: // - CirconusAPIToken // metric management enabled (search for existing check or create a new one) // - CirconusSubmissionUrl // metric management disabled (use check with specified submission_url, // broker must be using a public SSL certificate) // - CirconusAPIToken + CirconusCheckSubmissionURL // metric management enabled (use check with specified submission_url) // - CirconusAPIToken + CirconusCheckID // metric management enabled (use check with specified id) // CirconusAPIToken is a valid API Token used to create/manage check. If provided, // metric management is enabled. // Default: none CirconusAPIToken string `mapstructure:"circonus_api_token" json:"-"` // CirconusAPIApp is an app name associated with API token. // Default: "consul" CirconusAPIApp string `mapstructure:"circonus_api_app"` // CirconusAPIURL is the base URL to use for contacting the Circonus API. // Default: "https://api.circonus.com/v2" CirconusAPIURL string `mapstructure:"circonus_api_url"` // CirconusSubmissionInterval is the interval at which metrics are submitted to Circonus. // Default: 10s CirconusSubmissionInterval string `mapstructure:"circonus_submission_interval"` // CirconusCheckSubmissionURL is the check.config.submission_url field from a // previously created HTTPTRAP check. // Default: none CirconusCheckSubmissionURL string `mapstructure:"circonus_submission_url"` // CirconusCheckID is the check id (not check bundle id) from a previously created // HTTPTRAP check. The numeric portion of the check._cid field. // Default: none CirconusCheckID string `mapstructure:"circonus_check_id"` // CirconusCheckForceMetricActivation will force enabling metrics, as they are encountered, // if the metric already exists and is NOT active. If check management is enabled, the default // behavior is to add new metrics as they are encoutered. If the metric already exists in the // check, it will *NOT* be activated. This setting overrides that behavior. // Default: "false" CirconusCheckForceMetricActivation string `mapstructure:"circonus_check_force_metric_activation"` // CirconusCheckInstanceID serves to uniquely identify the metrics coming from this "instance". // It can be used to maintain metric continuity with transient or ephemeral instances as // they move around within an infrastructure. // Default: hostname:app CirconusCheckInstanceID string `mapstructure:"circonus_check_instance_id"` // CirconusCheckSearchTag is a special tag which, when coupled with the instance id, helps to // narrow down the search results when neither a Submission URL or Check ID is provided. // Default: service:app (e.g. service:consul) CirconusCheckSearchTag string `mapstructure:"circonus_check_search_tag"` // CirconusBrokerID is an explicit broker to use when creating a new check. The numeric portion // of broker._cid. If metric management is enabled and neither a Submission URL nor Check ID // is provided, an attempt will be made to search for an existing check using Instance ID and // Search Tag. If one is not found, a new HTTPTRAP check will be created. // Default: use Select Tag if provided, otherwise, a random Enterprise Broker associated // with the specified API token or the default Circonus Broker. // Default: none CirconusBrokerID string `mapstructure:"circonus_broker_id"` // CirconusBrokerSelectTag is a special tag which will be used to select a broker when // a Broker ID is not provided. The best use of this is to as a hint for which broker // should be used based on *where* this particular instance is running. // (e.g. a specific geo location or datacenter, dc:sfo) // Default: none CirconusBrokerSelectTag string `mapstructure:"circonus_broker_select_tag"` } // Config is the configuration that can be set for an Agent. // Some of this is configurable as CLI flags, but most must // be set using a configuration file. type Config struct { // DevMode enables a fast-path mode of operation to bring up an in-memory // server with minimal configuration. Useful for developing Consul. DevMode bool `mapstructure:"-"` // Performance is used to tune the performance of Consul's subsystems. Performance Performance `mapstructure:"performance"` // Bootstrap is used to bring up the first Consul server, and // permits that node to elect itself leader Bootstrap bool `mapstructure:"bootstrap"` // BootstrapExpect tries to automatically bootstrap the Consul cluster, // by withholding peers until enough servers join. BootstrapExpect int `mapstructure:"bootstrap_expect"` // Server controls if this agent acts like a Consul server, // or merely as a client. Servers have more state, take part // in leader election, etc. Server bool `mapstructure:"server"` // Datacenter is the datacenter this node is in. Defaults to dc1 Datacenter string `mapstructure:"datacenter"` // DataDir is the directory to store our state in DataDir string `mapstructure:"data_dir"` // DNSRecursors can be set to allow the DNS servers to recursively // resolve non-consul domains. It is deprecated, and merges into the // recursors array. DNSRecursor string `mapstructure:"recursor"` // DNSRecursors can be set to allow the DNS servers to recursively // resolve non-consul domains DNSRecursors []string `mapstructure:"recursors"` // DNS configuration DNSConfig DNSConfig `mapstructure:"dns_config"` // Domain is the DNS domain for the records. Defaults to "consul." Domain string `mapstructure:"domain"` // Encryption key to use for the Serf communication EncryptKey string `mapstructure:"encrypt" json:"-"` // LogLevel is the level of the logs to putout LogLevel string `mapstructure:"log_level"` // Node name is the name we use to advertise. Defaults to hostname. NodeName string `mapstructure:"node_name"` // ClientAddr is used to control the address we bind to for // client services (DNS, HTTP, HTTPS, RPC) ClientAddr string `mapstructure:"client_addr"` // 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) BindAddr string `mapstructure:"bind_addr"` // AdvertiseAddr is the address we use for advertising our Serf, // and Consul RPC IP. If not specified, bind address is used. AdvertiseAddr string `mapstructure:"advertise_addr"` // AdvertiseAddrs configuration AdvertiseAddrs AdvertiseAddrsConfig `mapstructure:"advertise_addrs"` // AdvertiseAddrWan is the address we use for advertising our // Serf WAN IP. If not specified, the general advertise address is used. AdvertiseAddrWan string `mapstructure:"advertise_addr_wan"` // TranslateWanAddrs controls whether or not Consul should prefer // the "wan" tagged address when doing lookups in remote datacenters. // See TaggedAddresses below for more details. TranslateWanAddrs bool `mapstructure:"translate_wan_addrs"` // Port configurations Ports PortConfig // Address configurations Addresses AddressConfig // Tagged addresses. These 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. TaggedAddresses map[string]string // LeaveOnTerm controls if Serf does a graceful leave when receiving // the TERM signal. Defaults false. This can be changed on reload. LeaveOnTerm bool `mapstructure:"leave_on_terminate"` // SkipLeaveOnInt controls if Serf skips a graceful leave when // receiving the INT signal. Defaults false on clients, true on // servers. This can be changed on reload. SkipLeaveOnInt *bool `mapstructure:"skip_leave_on_interrupt"` Telemetry Telemetry `mapstructure:"telemetry"` // Protocol is the Consul protocol version to use. Protocol int `mapstructure:"protocol"` // EnableDebug is used to enable various debugging features EnableDebug bool `mapstructure:"enable_debug"` // 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. VerifyIncoming bool `mapstructure:"verify_incoming"` // 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. VerifyOutgoing bool `mapstructure:"verify_outgoing"` // 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. VerifyServerHostname bool `mapstructure:"verify_server_hostname"` // CAFile is a path to a certificate authority file. This is used with VerifyIncoming // or VerifyOutgoing to verify the TLS connection. CAFile string `mapstructure:"ca_file"` // CertFile is used to provide a TLS certificate that is used for serving TLS connections. // Must be provided to serve TLS connections. CertFile string `mapstructure:"cert_file"` // KeyFile is used to provide a TLS key that is used for serving TLS connections. // Must be provided to serve TLS connections. KeyFile string `mapstructure:"key_file"` // ServerName is used with the TLS certificates to ensure the name we // provide matches the certificate ServerName string `mapstructure:"server_name"` // StartJoin is a list of addresses to attempt to join when the // agent starts. If Serf is unable to communicate with any of these // addresses, then the agent will error and exit. StartJoin []string `mapstructure:"start_join"` // 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. StartJoinWan []string `mapstructure:"start_join_wan"` // RetryJoin is a list of addresses to join with retry enabled. RetryJoin []string `mapstructure:"retry_join"` // RetryMaxAttempts 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. RetryMaxAttempts int `mapstructure:"retry_max"` // RetryInterval 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. RetryInterval time.Duration `mapstructure:"-" json:"-"` RetryIntervalRaw string `mapstructure:"retry_interval"` // RetryJoinWan is a list of addresses to join -wan with retry enabled. RetryJoinWan []string `mapstructure:"retry_join_wan"` // RetryMaxAttemptsWan specifies the maximum number of times to retry joining a // -wan host on startup. This is useful for cases where we know the node will be // online eventually. RetryMaxAttemptsWan int `mapstructure:"retry_max_wan"` // RetryIntervalWan specifies the amount of time to wait in between join // -wan attempts on agent start. The minimum allowed value is 1 second and // the default is 30s. RetryIntervalWan time.Duration `mapstructure:"-" json:"-"` RetryIntervalWanRaw string `mapstructure:"retry_interval_wan"` // ReconnectTimeout* specify 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. ReconnectTimeoutLan time.Duration `mapstructure:"-"` ReconnectTimeoutLanRaw string `mapstructure:"reconnect_timeout"` ReconnectTimeoutWan time.Duration `mapstructure:"-"` ReconnectTimeoutWanRaw string `mapstructure:"reconnect_timeout_wan"` // EnableUi enables the statically-compiled assets for the Consul web UI and // serves them at the default /ui/ endpoint automatically. EnableUi bool `mapstructure:"ui"` // UiDir is the directory containing the Web UI resources. // If provided, the UI endpoints will be enabled. UiDir string `mapstructure:"ui_dir"` // PidFile is the file to store our PID in PidFile string `mapstructure:"pid_file"` // EnableSyslog is used to also tee all the logs over to syslog. Only supported // on linux and OSX. Other platforms will generate an error. EnableSyslog bool `mapstructure:"enable_syslog"` // SyslogFacility is used to control where the syslog messages go // By default, goes to LOCAL0 SyslogFacility string `mapstructure:"syslog_facility"` // 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. RejoinAfterLeave bool `mapstructure:"rejoin_after_leave"` // 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. CheckUpdateInterval time.Duration `mapstructure:"-"` CheckUpdateIntervalRaw string `mapstructure:"check_update_interval" json:"-"` // CheckReapInterval controls the interval on which we will look for // failed checks and reap their associated services, if so configured. CheckReapInterval time.Duration `mapstructure:"-"` // CheckDeregisterIntervalMin is the smallest allowed interval to set // a check's DeregisterCriticalServiceAfter value to. CheckDeregisterIntervalMin time.Duration `mapstructure:"-"` // 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. ACLToken string `mapstructure:"acl_token" json:"-"` // 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. ACLMasterToken string `mapstructure:"acl_master_token" json:"-"` // 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. ACLDatacenter string `mapstructure:"acl_datacenter"` // 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. ACLTTL time.Duration `mapstructure:"-"` ACLTTLRaw string `mapstructure:"acl_ttl"` // 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. ACLDefaultPolicy string `mapstructure:"acl_default_policy"` // ACLDownPolicy is used to control the ACL interaction when we cannot // reach the ACLDatacenter and the token is not in the cache. // There are two modes: // * 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. ACLDownPolicy string `mapstructure:"acl_down_policy"` // 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. ACLReplicationToken string `mapstructure:"acl_replication_token" json:"-"` // 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. Watches []map[string]interface{} `mapstructure:"watches"` // DisableRemoteExec is used to turn off the remote execution // feature. This is for security to prevent unknown scripts from running. DisableRemoteExec bool `mapstructure:"disable_remote_exec"` // DisableUpdateCheck is used to turn off the automatic update and // security bulletin checking. DisableUpdateCheck bool `mapstructure:"disable_update_check"` // DisableAnonymousSignature is used to turn off the anonymous signature // send with the update check. This is used to deduplicate messages. DisableAnonymousSignature bool `mapstructure:"disable_anonymous_signature"` // HTTPAPIResponseHeaders are used to add HTTP header response fields to the HTTP API responses. HTTPAPIResponseHeaders map[string]string `mapstructure:"http_api_response_headers"` // AtlasInfrastructure is the name of the infrastructure we belong to. e.g. hashicorp/stage AtlasInfrastructure string `mapstructure:"atlas_infrastructure"` // AtlasToken is our authentication token from Atlas AtlasToken string `mapstructure:"atlas_token" json:"-"` // AtlasACLToken is applied to inbound requests if no other token // is provided. This takes higher precedence than the ACLToken. // Without this, the ACLToken is used. If that is not specified either, // then the 'anonymous' token is used. This can be set to 'anonymous' // to reduce the Atlas privileges to below that of the ACLToken. AtlasACLToken string `mapstructure:"atlas_acl_token" json:"-"` // AtlasJoin controls if Atlas will attempt to auto-join the node // to it's cluster. Requires Atlas integration. AtlasJoin bool `mapstructure:"atlas_join"` // AtlasEndpoint is the SCADA endpoint used for Atlas integration. If // empty, the defaults from the provider are used. AtlasEndpoint string `mapstructure:"atlas_endpoint"` // AEInterval controls the anti-entropy interval. This is how often // the agent attempts to reconcile its local state with the server's // representation of our state. Defaults to every 60s. AEInterval time.Duration `mapstructure:"-" json:"-"` // DisableCoordinates controls features related to network coordinates. DisableCoordinates bool `mapstructure:"disable_coordinates"` // SyncCoordinateRateTarget controls the rate for sending network // coordinates to the server, in updates per second. This is the max rate // that the server supports, so we scale our interval based on the size // of the cluster to try to achieve this in aggregate at the server. SyncCoordinateRateTarget float64 `mapstructure:"-" json:"-"` // SyncCoordinateIntervalMin sets the minimum interval that coordinates // will be sent to the server. We scale the interval based on the cluster // size, but below a certain interval it doesn't make sense send them any // faster. SyncCoordinateIntervalMin time.Duration `mapstructure:"-" json:"-"` // Checks holds the provided check definitions Checks []*CheckDefinition `mapstructure:"-" json:"-"` // Services holds the provided service definitions Services []*ServiceDefinition `mapstructure:"-" json:"-"` // ConsulConfig can either be provided or a default one created ConsulConfig *consul.Config `mapstructure:"-" json:"-"` // Revision is the GitCommit this maps to Revision string `mapstructure:"-"` // Version is the release version number Version string `mapstructure:"-"` // VersionPrerelease is a label for pre-release builds VersionPrerelease string `mapstructure:"-"` // WatchPlans contains the compiled watches WatchPlans []*watch.WatchPlan `mapstructure:"-" json:"-"` // UnixSockets is a map of socket configuration data UnixSockets UnixSocketConfig `mapstructure:"unix_sockets"` // Minimum Session TTL SessionTTLMin time.Duration `mapstructure:"-"` SessionTTLMinRaw string `mapstructure:"session_ttl_min"` // Reap controls automatic reaping of child processes, useful if running // as PID 1 in a Docker container. This defaults to nil which will make // Consul reap only if it detects it's running as PID 1. If non-nil, // then this will be used to decide if reaping is enabled. Reap *bool `mapstructure:"reap"` } // Bool is used to initialize bool pointers in struct literals. func Bool(b bool) *bool { return &b } // UnixSocketPermissions contains information about a unix socket, and // implements the FilePermissions interface. type UnixSocketPermissions struct { Usr string `mapstructure:"user"` Grp string `mapstructure:"group"` Perms string `mapstructure:"mode"` } func (u UnixSocketPermissions) User() string { return u.Usr } func (u UnixSocketPermissions) Group() string { return u.Grp } func (u UnixSocketPermissions) Mode() string { return u.Perms } func (s *Telemetry) GoString() string { return fmt.Sprintf("*%#v", *s) } // UnixSocketConfig stores information about various unix sockets which // Consul creates and uses for communication. type UnixSocketConfig struct { UnixSocketPermissions `mapstructure:",squash"` } // unixSocketAddr tests if a given address describes a domain socket, // and returns the relevant path part of the string if it is. func unixSocketAddr(addr string) (string, bool) { if !strings.HasPrefix(addr, "unix://") { return "", false } return strings.TrimPrefix(addr, "unix://"), true } type dirEnts []os.FileInfo // DefaultConfig is used to return a sane default configuration func DefaultConfig() *Config { return &Config{ Bootstrap: false, BootstrapExpect: 0, Server: false, Datacenter: consul.DefaultDC, Domain: "consul.", LogLevel: "INFO", ClientAddr: "127.0.0.1", BindAddr: "0.0.0.0", Ports: PortConfig{ DNS: 8600, HTTP: 8500, HTTPS: -1, RPC: 8400, SerfLan: consul.DefaultLANSerfPort, SerfWan: consul.DefaultWANSerfPort, Server: 8300, }, DNSConfig: DNSConfig{ UDPAnswerLimit: 3, MaxStale: 5 * time.Second, }, Telemetry: Telemetry{ StatsitePrefix: "consul", }, SyslogFacility: "LOCAL0", Protocol: consul.ProtocolVersion2Compatible, CheckUpdateInterval: 5 * time.Minute, CheckDeregisterIntervalMin: time.Minute, CheckReapInterval: 30 * time.Second, AEInterval: time.Minute, DisableCoordinates: false, // SyncCoordinateRateTarget is set based on the rate that we want // the server to handle as an aggregate across the entire cluster. // If you update this, you'll need to adjust CoordinateUpdate* in // the server-side config accordingly. SyncCoordinateRateTarget: 64.0, // updates / second SyncCoordinateIntervalMin: 15 * time.Second, ACLTTL: 30 * time.Second, ACLDownPolicy: "extend-cache", ACLDefaultPolicy: "allow", RetryInterval: 30 * time.Second, RetryIntervalWan: 30 * time.Second, } } // DevConfig is used to return a set of configuration to use for dev mode. func DevConfig() *Config { conf := DefaultConfig() conf.DevMode = true conf.LogLevel = "DEBUG" conf.Server = true conf.EnableDebug = true conf.DisableAnonymousSignature = true conf.EnableUi = true conf.BindAddr = "127.0.0.1" return conf } // EncryptBytes returns the encryption key configured. func (c *Config) EncryptBytes() ([]byte, error) { return base64.StdEncoding.DecodeString(c.EncryptKey) } // ClientListener is used to format a listener for a // port on a ClientAddr func (c *Config) ClientListener(override string, port int) (net.Addr, error) { var addr string if override != "" { addr = override } else { addr = c.ClientAddr } if path, ok := unixSocketAddr(addr); ok { return &net.UnixAddr{Name: path, Net: "unix"}, nil } ip := net.ParseIP(addr) if ip == nil { return nil, fmt.Errorf("Failed to parse IP: %v", addr) } return &net.TCPAddr{IP: ip, Port: port}, nil } // DecodeConfig reads the configuration from the given reader in JSON // format and decodes it into a proper Config structure. func DecodeConfig(r io.Reader) (*Config, error) { var raw interface{} var result Config dec := json.NewDecoder(r) if err := dec.Decode(&raw); err != nil { return nil, err } // Check the result type if obj, ok := raw.(map[string]interface{}); ok { // Check for a "services", "service" or "check" key, meaning // this is actually a definition entry if sub, ok := obj["services"]; ok { if list, ok := sub.([]interface{}); ok { for _, srv := range list { service, err := DecodeServiceDefinition(srv) if err != nil { return nil, err } result.Services = append(result.Services, service) } } } if sub, ok := obj["service"]; ok { service, err := DecodeServiceDefinition(sub) if err != nil { return nil, err } result.Services = append(result.Services, service) } if sub, ok := obj["checks"]; ok { if list, ok := sub.([]interface{}); ok { for _, chk := range list { check, err := DecodeCheckDefinition(chk) if err != nil { return nil, err } result.Checks = append(result.Checks, check) } } } if sub, ok := obj["check"]; ok { check, err := DecodeCheckDefinition(sub) if err != nil { return nil, err } result.Checks = append(result.Checks, check) } // A little hacky but upgrades the old stats config directives to the new way if sub, ok := obj["statsd_addr"]; ok && result.Telemetry.StatsdAddr == "" { result.Telemetry.StatsdAddr = sub.(string) } if sub, ok := obj["statsite_addr"]; ok && result.Telemetry.StatsiteAddr == "" { result.Telemetry.StatsiteAddr = sub.(string) } if sub, ok := obj["statsite_prefix"]; ok && result.Telemetry.StatsitePrefix == "" { result.Telemetry.StatsitePrefix = sub.(string) } if sub, ok := obj["dogstatsd_addr"]; ok && result.Telemetry.DogStatsdAddr == "" { result.Telemetry.DogStatsdAddr = sub.(string) } if sub, ok := obj["dogstatsd_tags"].([]interface{}); ok && len(result.Telemetry.DogStatsdTags) == 0 { result.Telemetry.DogStatsdTags = make([]string, len(sub)) for i := range sub { result.Telemetry.DogStatsdTags[i] = sub[i].(string) } } } // Decode var md mapstructure.Metadata msdec, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{ Metadata: &md, Result: &result, }) if err != nil { return nil, err } if err := msdec.Decode(raw); err != nil { return nil, err } // Check unused fields and verify that no bad configuration options were // passed to Consul. There are a few additional fields which don't directly // use mapstructure decoding, so we need to account for those as well. These // telemetry-related fields used to be available as top-level keys, so they // are here for backward compatibility with the old format. allowedKeys := []string{ "service", "services", "check", "checks", "statsd_addr", "statsite_addr", "statsite_prefix", "dogstatsd_addr", "dogstatsd_tags", } var unused []string for _, field := range md.Unused { if !lib.StrContains(allowedKeys, field) { unused = append(unused, field) } } if len(unused) > 0 { return nil, fmt.Errorf("Config has invalid keys: %s", strings.Join(unused, ",")) } // Handle time conversions if raw := result.DNSConfig.NodeTTLRaw; raw != "" { dur, err := time.ParseDuration(raw) if err != nil { return nil, fmt.Errorf("NodeTTL invalid: %v", err) } result.DNSConfig.NodeTTL = dur } if raw := result.DNSConfig.MaxStaleRaw; raw != "" { dur, err := time.ParseDuration(raw) if err != nil { return nil, fmt.Errorf("MaxStale invalid: %v", err) } result.DNSConfig.MaxStale = dur } if len(result.DNSConfig.ServiceTTLRaw) != 0 { if result.DNSConfig.ServiceTTL == nil { result.DNSConfig.ServiceTTL = make(map[string]time.Duration) } for service, raw := range result.DNSConfig.ServiceTTLRaw { dur, err := time.ParseDuration(raw) if err != nil { return nil, fmt.Errorf("ServiceTTL %s invalid: %v", service, err) } result.DNSConfig.ServiceTTL[service] = dur } } if raw := result.CheckUpdateIntervalRaw; raw != "" { dur, err := time.ParseDuration(raw) if err != nil { return nil, fmt.Errorf("CheckUpdateInterval invalid: %v", err) } result.CheckUpdateInterval = dur } if raw := result.ACLTTLRaw; raw != "" { dur, err := time.ParseDuration(raw) if err != nil { return nil, fmt.Errorf("ACL TTL invalid: %v", err) } result.ACLTTL = dur } if raw := result.RetryIntervalRaw; raw != "" { dur, err := time.ParseDuration(raw) if err != nil { return nil, fmt.Errorf("RetryInterval invalid: %v", err) } result.RetryInterval = dur } if raw := result.RetryIntervalWanRaw; raw != "" { dur, err := time.ParseDuration(raw) if err != nil { return nil, fmt.Errorf("RetryIntervalWan invalid: %v", err) } result.RetryIntervalWan = dur } const reconnectTimeoutMin = 8 * time.Hour if raw := result.ReconnectTimeoutLanRaw; raw != "" { dur, err := time.ParseDuration(raw) if err != nil { return nil, fmt.Errorf("ReconnectTimeoutLan invalid: %v", err) } if dur < reconnectTimeoutMin { return nil, fmt.Errorf("ReconnectTimeoutLan must be >= %s", reconnectTimeoutMin.String()) } result.ReconnectTimeoutLan = dur } if raw := result.ReconnectTimeoutWanRaw; raw != "" { dur, err := time.ParseDuration(raw) if err != nil { return nil, fmt.Errorf("ReconnectTimeoutWan invalid: %v", err) } if dur < reconnectTimeoutMin { return nil, fmt.Errorf("ReconnectTimeoutWan must be >= %s", reconnectTimeoutMin.String()) } result.ReconnectTimeoutWan = dur } // Merge the single recursor if result.DNSRecursor != "" { result.DNSRecursors = append(result.DNSRecursors, result.DNSRecursor) } if raw := result.SessionTTLMinRaw; raw != "" { dur, err := time.ParseDuration(raw) if err != nil { return nil, fmt.Errorf("Session TTL Min invalid: %v", err) } result.SessionTTLMin = dur } if result.AdvertiseAddrs.SerfLanRaw != "" { addr, err := net.ResolveTCPAddr("tcp", result.AdvertiseAddrs.SerfLanRaw) if err != nil { return nil, fmt.Errorf("AdvertiseAddrs.SerfLan is invalid: %v", err) } result.AdvertiseAddrs.SerfLan = addr } if result.AdvertiseAddrs.SerfWanRaw != "" { addr, err := net.ResolveTCPAddr("tcp", result.AdvertiseAddrs.SerfWanRaw) if err != nil { return nil, fmt.Errorf("AdvertiseAddrs.SerfWan is invalid: %v", err) } result.AdvertiseAddrs.SerfWan = addr } if result.AdvertiseAddrs.RPCRaw != "" { addr, err := net.ResolveTCPAddr("tcp", result.AdvertiseAddrs.RPCRaw) if err != nil { return nil, fmt.Errorf("AdvertiseAddrs.RPC is invalid: %v", err) } result.AdvertiseAddrs.RPC = addr } // Enforce the max Raft multiplier. if result.Performance.RaftMultiplier > consul.MaxRaftMultiplier { return nil, fmt.Errorf("Performance.RaftMultiplier must be <= %d", consul.MaxRaftMultiplier) } return &result, nil } // DecodeServiceDefinition is used to decode a service definition func DecodeServiceDefinition(raw interface{}) (*ServiceDefinition, error) { rawMap, ok := raw.(map[string]interface{}) if !ok { goto AFTER_FIX } // If no 'tags', handle the deprecated 'tag' value. if _, ok := rawMap["tags"]; !ok { if tag, ok := rawMap["tag"]; ok { rawMap["tags"] = []interface{}{tag} } } for k, v := range rawMap { switch strings.ToLower(k) { case "check": if err := FixupCheckType(v); err != nil { return nil, err } case "checks": chkTypes, ok := v.([]interface{}) if !ok { goto AFTER_FIX } for _, chkType := range chkTypes { if err := FixupCheckType(chkType); err != nil { return nil, err } } } } AFTER_FIX: var md mapstructure.Metadata var result ServiceDefinition msdec, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{ Metadata: &md, Result: &result, }) if err != nil { return nil, err } if err := msdec.Decode(raw); err != nil { return nil, err } return &result, nil } func FixupCheckType(raw interface{}) error { var ttlKey, intervalKey, timeoutKey string const deregisterKey = "DeregisterCriticalServiceAfter" // Handle decoding of time durations rawMap, ok := raw.(map[string]interface{}) if !ok { return nil } for k, v := range rawMap { switch strings.ToLower(k) { case "ttl": ttlKey = k case "interval": intervalKey = k case "timeout": timeoutKey = k case "deregister_critical_service_after": rawMap[deregisterKey] = v delete(rawMap, k) case "service_id": rawMap["serviceid"] = v delete(rawMap, k) case "docker_container_id": rawMap["DockerContainerID"] = v delete(rawMap, k) } } if ttl, ok := rawMap[ttlKey]; ok { ttlS, ok := ttl.(string) if ok { if dur, err := time.ParseDuration(ttlS); err != nil { return err } else { rawMap[ttlKey] = dur } } } if interval, ok := rawMap[intervalKey]; ok { intervalS, ok := interval.(string) if ok { if dur, err := time.ParseDuration(intervalS); err != nil { return err } else { rawMap[intervalKey] = dur } } } if timeout, ok := rawMap[timeoutKey]; ok { timeoutS, ok := timeout.(string) if ok { if dur, err := time.ParseDuration(timeoutS); err != nil { return err } else { rawMap[timeoutKey] = dur } } } if deregister, ok := rawMap[deregisterKey]; ok { timeoutS, ok := deregister.(string) if ok { if dur, err := time.ParseDuration(timeoutS); err != nil { return err } else { rawMap[deregisterKey] = dur } } } return nil } // DecodeCheckDefinition is used to decode a check definition func DecodeCheckDefinition(raw interface{}) (*CheckDefinition, error) { if err := FixupCheckType(raw); err != nil { return nil, err } var md mapstructure.Metadata var result CheckDefinition msdec, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{ Metadata: &md, Result: &result, }) if err != nil { return nil, err } if err := msdec.Decode(raw); err != nil { return nil, err } return &result, nil } // MergeConfig merges two configurations together to make a single new // configuration. func MergeConfig(a, b *Config) *Config { var result Config = *a // Propagate non-default performance settings if b.Performance.RaftMultiplier > 0 { result.Performance.RaftMultiplier = b.Performance.RaftMultiplier } // Copy the strings if they're set if b.Bootstrap { result.Bootstrap = true } if b.BootstrapExpect != 0 { result.BootstrapExpect = b.BootstrapExpect } if b.Datacenter != "" { result.Datacenter = b.Datacenter } if b.DataDir != "" { result.DataDir = b.DataDir } // Copy the dns recursors result.DNSRecursors = make([]string, 0, len(a.DNSRecursors)+len(b.DNSRecursors)) result.DNSRecursors = append(result.DNSRecursors, a.DNSRecursors...) result.DNSRecursors = append(result.DNSRecursors, b.DNSRecursors...) if b.Domain != "" { result.Domain = b.Domain } if b.EncryptKey != "" { result.EncryptKey = b.EncryptKey } if b.LogLevel != "" { result.LogLevel = b.LogLevel } if b.Protocol > 0 { result.Protocol = b.Protocol } if b.NodeName != "" { result.NodeName = b.NodeName } if b.ClientAddr != "" { result.ClientAddr = b.ClientAddr } if b.BindAddr != "" { result.BindAddr = b.BindAddr } if b.AdvertiseAddr != "" { result.AdvertiseAddr = b.AdvertiseAddr } if b.AdvertiseAddrWan != "" { result.AdvertiseAddrWan = b.AdvertiseAddrWan } if b.TranslateWanAddrs == true { result.TranslateWanAddrs = true } if b.AdvertiseAddrs.SerfLan != nil { result.AdvertiseAddrs.SerfLan = b.AdvertiseAddrs.SerfLan result.AdvertiseAddrs.SerfLanRaw = b.AdvertiseAddrs.SerfLanRaw } if b.AdvertiseAddrs.SerfWan != nil { result.AdvertiseAddrs.SerfWan = b.AdvertiseAddrs.SerfWan result.AdvertiseAddrs.SerfWanRaw = b.AdvertiseAddrs.SerfWanRaw } if b.AdvertiseAddrs.RPC != nil { result.AdvertiseAddrs.RPC = b.AdvertiseAddrs.RPC result.AdvertiseAddrs.RPCRaw = b.AdvertiseAddrs.RPCRaw } if b.Server == true { result.Server = b.Server } if b.LeaveOnTerm == true { result.LeaveOnTerm = true } if b.SkipLeaveOnInt != nil { result.SkipLeaveOnInt = b.SkipLeaveOnInt } if b.Telemetry.DisableHostname == true { result.Telemetry.DisableHostname = true } if b.Telemetry.StatsdAddr != "" { result.Telemetry.StatsdAddr = b.Telemetry.StatsdAddr } if b.Telemetry.StatsiteAddr != "" { result.Telemetry.StatsiteAddr = b.Telemetry.StatsiteAddr } if b.Telemetry.StatsitePrefix != "" { result.Telemetry.StatsitePrefix = b.Telemetry.StatsitePrefix } if b.Telemetry.DogStatsdAddr != "" { result.Telemetry.DogStatsdAddr = b.Telemetry.DogStatsdAddr } if b.Telemetry.DogStatsdTags != nil { result.Telemetry.DogStatsdTags = b.Telemetry.DogStatsdTags } if b.Telemetry.CirconusAPIToken != "" { result.Telemetry.CirconusAPIToken = b.Telemetry.CirconusAPIToken } if b.Telemetry.CirconusAPIApp != "" { result.Telemetry.CirconusAPIApp = b.Telemetry.CirconusAPIApp } if b.Telemetry.CirconusAPIURL != "" { result.Telemetry.CirconusAPIURL = b.Telemetry.CirconusAPIURL } if b.Telemetry.CirconusCheckSubmissionURL != "" { result.Telemetry.CirconusCheckSubmissionURL = b.Telemetry.CirconusCheckSubmissionURL } if b.Telemetry.CirconusSubmissionInterval != "" { result.Telemetry.CirconusSubmissionInterval = b.Telemetry.CirconusSubmissionInterval } if b.Telemetry.CirconusCheckID != "" { result.Telemetry.CirconusCheckID = b.Telemetry.CirconusCheckID } if b.Telemetry.CirconusCheckForceMetricActivation != "" { result.Telemetry.CirconusCheckForceMetricActivation = b.Telemetry.CirconusCheckForceMetricActivation } if b.Telemetry.CirconusCheckInstanceID != "" { result.Telemetry.CirconusCheckInstanceID = b.Telemetry.CirconusCheckInstanceID } if b.Telemetry.CirconusCheckSearchTag != "" { result.Telemetry.CirconusCheckSearchTag = b.Telemetry.CirconusCheckSearchTag } if b.Telemetry.CirconusBrokerID != "" { result.Telemetry.CirconusBrokerID = b.Telemetry.CirconusBrokerID } if b.Telemetry.CirconusBrokerSelectTag != "" { result.Telemetry.CirconusBrokerSelectTag = b.Telemetry.CirconusBrokerSelectTag } if b.EnableDebug { result.EnableDebug = true } if b.VerifyIncoming { result.VerifyIncoming = true } if b.VerifyOutgoing { result.VerifyOutgoing = true } if b.VerifyServerHostname { result.VerifyServerHostname = true } if b.CAFile != "" { result.CAFile = b.CAFile } if b.CertFile != "" { result.CertFile = b.CertFile } if b.KeyFile != "" { result.KeyFile = b.KeyFile } if b.ServerName != "" { result.ServerName = b.ServerName } if b.Checks != nil { result.Checks = append(result.Checks, b.Checks...) } if b.Services != nil { result.Services = append(result.Services, b.Services...) } if b.Ports.DNS != 0 { result.Ports.DNS = b.Ports.DNS } if b.Ports.HTTP != 0 { result.Ports.HTTP = b.Ports.HTTP } if b.Ports.HTTPS != 0 { result.Ports.HTTPS = b.Ports.HTTPS } if b.Ports.RPC != 0 { result.Ports.RPC = b.Ports.RPC } if b.Ports.SerfLan != 0 { result.Ports.SerfLan = b.Ports.SerfLan } if b.Ports.SerfWan != 0 { result.Ports.SerfWan = b.Ports.SerfWan } if b.Ports.Server != 0 { result.Ports.Server = b.Ports.Server } if b.Addresses.DNS != "" { result.Addresses.DNS = b.Addresses.DNS } if b.Addresses.HTTP != "" { result.Addresses.HTTP = b.Addresses.HTTP } if b.Addresses.HTTPS != "" { result.Addresses.HTTPS = b.Addresses.HTTPS } if b.Addresses.RPC != "" { result.Addresses.RPC = b.Addresses.RPC } if b.EnableUi { result.EnableUi = true } if b.UiDir != "" { result.UiDir = b.UiDir } if b.PidFile != "" { result.PidFile = b.PidFile } if b.EnableSyslog { result.EnableSyslog = true } if b.RejoinAfterLeave { result.RejoinAfterLeave = true } if b.RetryMaxAttempts != 0 { result.RetryMaxAttempts = b.RetryMaxAttempts } if b.RetryInterval != 0 { result.RetryInterval = b.RetryInterval } if b.RetryMaxAttemptsWan != 0 { result.RetryMaxAttemptsWan = b.RetryMaxAttemptsWan } if b.RetryIntervalWan != 0 { result.RetryIntervalWan = b.RetryIntervalWan } if b.ReconnectTimeoutLan != 0 { result.ReconnectTimeoutLan = b.ReconnectTimeoutLan result.ReconnectTimeoutLanRaw = b.ReconnectTimeoutLanRaw } if b.ReconnectTimeoutWan != 0 { result.ReconnectTimeoutWan = b.ReconnectTimeoutWan result.ReconnectTimeoutWanRaw = b.ReconnectTimeoutWanRaw } if b.DNSConfig.NodeTTL != 0 { result.DNSConfig.NodeTTL = b.DNSConfig.NodeTTL } if len(b.DNSConfig.ServiceTTL) != 0 { if result.DNSConfig.ServiceTTL == nil { result.DNSConfig.ServiceTTL = make(map[string]time.Duration) } for service, dur := range b.DNSConfig.ServiceTTL { result.DNSConfig.ServiceTTL[service] = dur } } if b.DNSConfig.AllowStale { result.DNSConfig.AllowStale = true } if b.DNSConfig.UDPAnswerLimit != 0 { result.DNSConfig.UDPAnswerLimit = b.DNSConfig.UDPAnswerLimit } if b.DNSConfig.EnableTruncate { result.DNSConfig.EnableTruncate = true } if b.DNSConfig.MaxStale != 0 { result.DNSConfig.MaxStale = b.DNSConfig.MaxStale } if b.DNSConfig.OnlyPassing { result.DNSConfig.OnlyPassing = true } if b.DNSConfig.DisableCompression { result.DNSConfig.DisableCompression = true } if b.CheckUpdateIntervalRaw != "" || b.CheckUpdateInterval != 0 { result.CheckUpdateInterval = b.CheckUpdateInterval } if b.SyslogFacility != "" { result.SyslogFacility = b.SyslogFacility } if b.ACLToken != "" { result.ACLToken = b.ACLToken } if b.ACLMasterToken != "" { result.ACLMasterToken = b.ACLMasterToken } if b.ACLDatacenter != "" { result.ACLDatacenter = b.ACLDatacenter } if b.ACLTTLRaw != "" { result.ACLTTL = b.ACLTTL result.ACLTTLRaw = b.ACLTTLRaw } if b.ACLDownPolicy != "" { result.ACLDownPolicy = b.ACLDownPolicy } if b.ACLDefaultPolicy != "" { result.ACLDefaultPolicy = b.ACLDefaultPolicy } if b.ACLReplicationToken != "" { result.ACLReplicationToken = b.ACLReplicationToken } if len(b.Watches) != 0 { result.Watches = append(result.Watches, b.Watches...) } if len(b.WatchPlans) != 0 { result.WatchPlans = append(result.WatchPlans, b.WatchPlans...) } if b.DisableRemoteExec { result.DisableRemoteExec = true } if b.DisableUpdateCheck { result.DisableUpdateCheck = true } if b.DisableAnonymousSignature { result.DisableAnonymousSignature = true } if b.UnixSockets.Usr != "" { result.UnixSockets.Usr = b.UnixSockets.Usr } if b.UnixSockets.Grp != "" { result.UnixSockets.Grp = b.UnixSockets.Grp } if b.UnixSockets.Perms != "" { result.UnixSockets.Perms = b.UnixSockets.Perms } if b.AtlasInfrastructure != "" { result.AtlasInfrastructure = b.AtlasInfrastructure } if b.AtlasToken != "" { result.AtlasToken = b.AtlasToken } if b.AtlasACLToken != "" { result.AtlasACLToken = b.AtlasACLToken } if b.AtlasJoin { result.AtlasJoin = true } if b.AtlasEndpoint != "" { result.AtlasEndpoint = b.AtlasEndpoint } if b.DisableCoordinates { result.DisableCoordinates = true } if b.SessionTTLMinRaw != "" { result.SessionTTLMin = b.SessionTTLMin result.SessionTTLMinRaw = b.SessionTTLMinRaw } if len(b.HTTPAPIResponseHeaders) != 0 { if result.HTTPAPIResponseHeaders == nil { result.HTTPAPIResponseHeaders = make(map[string]string) } for field, value := range b.HTTPAPIResponseHeaders { result.HTTPAPIResponseHeaders[field] = value } } // Copy the start join addresses result.StartJoin = make([]string, 0, len(a.StartJoin)+len(b.StartJoin)) result.StartJoin = append(result.StartJoin, a.StartJoin...) result.StartJoin = append(result.StartJoin, b.StartJoin...) // Copy the start join addresses result.StartJoinWan = make([]string, 0, len(a.StartJoinWan)+len(b.StartJoinWan)) result.StartJoinWan = append(result.StartJoinWan, a.StartJoinWan...) result.StartJoinWan = append(result.StartJoinWan, b.StartJoinWan...) // Copy the retry join addresses result.RetryJoin = make([]string, 0, len(a.RetryJoin)+len(b.RetryJoin)) result.RetryJoin = append(result.RetryJoin, a.RetryJoin...) result.RetryJoin = append(result.RetryJoin, b.RetryJoin...) // Copy the retry join -wan addresses result.RetryJoinWan = make([]string, 0, len(a.RetryJoinWan)+len(b.RetryJoinWan)) result.RetryJoinWan = append(result.RetryJoinWan, a.RetryJoinWan...) result.RetryJoinWan = append(result.RetryJoinWan, b.RetryJoinWan...) if b.Reap != nil { result.Reap = b.Reap } return &result } // ReadConfigPaths reads the paths in the given order to load configurations. // The paths can be to files or directories. If the path is a directory, // we read one directory deep and read any files ending in ".json" as // configuration files. func ReadConfigPaths(paths []string) (*Config, error) { result := new(Config) for _, path := range paths { f, err := os.Open(path) if err != nil { return nil, fmt.Errorf("Error reading '%s': %s", path, err) } fi, err := f.Stat() if err != nil { f.Close() return nil, fmt.Errorf("Error reading '%s': %s", path, err) } if !fi.IsDir() { config, err := DecodeConfig(f) f.Close() if err != nil { return nil, fmt.Errorf("Error decoding '%s': %s", path, err) } result = MergeConfig(result, config) continue } contents, err := f.Readdir(-1) f.Close() if err != nil { return nil, fmt.Errorf("Error reading '%s': %s", path, err) } // Sort the contents, ensures lexical order sort.Sort(dirEnts(contents)) for _, fi := range contents { // Don't recursively read contents if fi.IsDir() { continue } // If it isn't a JSON file, ignore it if !strings.HasSuffix(fi.Name(), ".json") { continue } // If the config file is empty, ignore it if fi.Size() == 0 { continue } subpath := filepath.Join(path, fi.Name()) f, err := os.Open(subpath) if err != nil { return nil, fmt.Errorf("Error reading '%s': %s", subpath, err) } config, err := DecodeConfig(f) f.Close() if err != nil { return nil, fmt.Errorf("Error decoding '%s': %s", subpath, err) } result = MergeConfig(result, config) } } return result, nil } // Implement the sort interface for dirEnts func (d dirEnts) Len() int { return len(d) } func (d dirEnts) Less(i, j int) bool { return d[i].Name() < d[j].Name() } func (d dirEnts) Swap(i, j int) { d[i], d[j] = d[j], d[i] }