consul

Documentation

Index

• Constants
• type AgentAPI
• type AllocRegistration
  • func (a *AllocRegistration) NumChecks() int
  • func (a *AllocRegistration) NumServices() int
• type CatalogAPI
• type ChecksAPI
• type MockAgent
  • func NewMockAgent() *MockAgent
  • func (c *MockAgent) CheckDeregister(checkID string) error
  • func (c *MockAgent) CheckRegister(check *api.AgentCheckRegistration) error
  • func (c *MockAgent) CheckRegs() []*api.AgentCheckRegistration
  • func (c *MockAgent) Checks() (map[string]*api.AgentCheck, error)
  • func (c *MockAgent) Self() (map[string]map[string]interface{}, error)
  • func (c *MockAgent) ServiceDeregister(serviceID string) error
  • func (c *MockAgent) ServiceRegister(service *api.AgentServiceRegistration) error
  • func (c *MockAgent) Services() (map[string]*api.AgentService, error)
  • func (c *MockAgent) SetStatus(s string) string
  • func (c *MockAgent) UpdateTTL(id string, output string, status string) error
• type MockCatalog
  • func NewMockCatalog(l log.Logger) *MockCatalog
  • func (m *MockCatalog) Datacenters() ([]string, error)
  • func (m *MockCatalog) Service(service, tag string, q *api.QueryOptions) ([]*api.CatalogService, *api.QueryMeta, error)
• type ServiceClient
  • func NewServiceClient(consulClient AgentAPI, logger log.Logger, isNomadClient bool) *ServiceClient
  • func (c *ServiceClient) AllocRegistrations(allocID string) (*AllocRegistration, error)
  • func (c *ServiceClient) RegisterAgent(role string, services []*structs.Service) error
  • func (c *ServiceClient) RegisterTask(task *TaskServices) error
  • func (c *ServiceClient) RemoveTask(task *TaskServices)
  • func (c *ServiceClient) Run()
  • func (c *ServiceClient) Shutdown() error
  • func (c *ServiceClient) UpdateTask(old, newTask *TaskServices) error
• type ServiceRegistration
• type TaskRegistration
• type TaskRestarter
• type TaskServices
  • func NewTaskServices(alloc *structs.Allocation, task *structs.Task, restarter TaskRestarter, ...) *TaskServices
  • func (t *TaskServices) Copy() *TaskServices

Constants

const (

	// DefaultQueryWaitDuration is the max duration the Consul Agent will
	// spend waiting for a response from a Consul Query.
	DefaultQueryWaitDuration = 2 * time.Second

	// ServiceTagHTTP is the tag assigned to HTTP services
	ServiceTagHTTP = "http"

	// ServiceTagRPC is the tag assigned to RPC services
	ServiceTagRPC = "rpc"

	// ServiceTagSerf is the tag assigned to Serf services
	ServiceTagSerf = "serf"
)

Types

type AgentAPI

type AgentAPI interface {
	Services() (map[string]*api.AgentService, error)
	Checks() (map[string]*api.AgentCheck, error)
	CheckRegister(check *api.AgentCheckRegistration) error
	CheckDeregister(checkID string) error
	Self() (map[string]map[string]interface{}, error)
	ServiceRegister(service *api.AgentServiceRegistration) error
	ServiceDeregister(serviceID string) error
	UpdateTTL(id, output, status string) error
}

AgentAPI is the consul/api.Agent API used by Nomad.

type AllocRegistration

type AllocRegistration struct {
	// Tasks maps the name of a task to its registered services and checks
	Tasks map[string]*TaskRegistration
}

AllocRegistration holds the status of services registered for a particular allocations by task.

func (*AllocRegistration) NumChecks

func (a *AllocRegistration) NumChecks() int

NumChecks returns the number of registered checks

func (*AllocRegistration) NumServices

func (a *AllocRegistration) NumServices() int

NumServices returns the number of registered services

type CatalogAPI

type CatalogAPI interface {
	Datacenters() ([]string, error)
	Service(service, tag string, q *api.QueryOptions) ([]*api.CatalogService, *api.QueryMeta, error)
}

CatalogAPI is the consul/api.Catalog API used by Nomad.

type ChecksAPI

type ChecksAPI interface {
	// Checks returns a list of all checks.
	Checks() (map[string]*api.AgentCheck, error)
}

ChecksAPI is the part of the Consul API the checkWatcher requires.

type MockAgent

type MockAgent struct {
	// contains filtered or unexported fields
}

MockAgent is a fake in-memory Consul backend for ServiceClient.

func NewMockAgent

func NewMockAgent() *MockAgent

NewMockAgent that returns all checks as passing.

func (*MockAgent) CheckDeregister

func (c *MockAgent) CheckDeregister(checkID string) error

func (*MockAgent) CheckRegister

func (c *MockAgent) CheckRegister(check *api.AgentCheckRegistration) error

func (*MockAgent) CheckRegs

func (c *MockAgent) CheckRegs() []*api.AgentCheckRegistration

CheckRegs returns the raw AgentCheckRegistrations registered with this mock agent.

func (*MockAgent) Checks

func (c *MockAgent) Checks() (map[string]*api.AgentCheck, error)

Checks implements the Agent API Checks method.

func (*MockAgent) Self

func (c *MockAgent) Self() (map[string]map[string]interface{}, error)

func (*MockAgent) ServiceDeregister

func (c *MockAgent) ServiceDeregister(serviceID string) error

func (*MockAgent) ServiceRegister

func (c *MockAgent) ServiceRegister(service *api.AgentServiceRegistration) error

func (*MockAgent) Services

func (c *MockAgent) Services() (map[string]*api.AgentService, error)

func (*MockAgent) SetStatus

func (c *MockAgent) SetStatus(s string) string

SetStatus that Checks() should return. Returns old status value.

func (*MockAgent) UpdateTTL

func (c *MockAgent) UpdateTTL(id string, output string, status string) error

type MockCatalog

type MockCatalog struct {
	// contains filtered or unexported fields
}

MockCatalog can be used for testing where the CatalogAPI is needed.

func NewMockCatalog

func NewMockCatalog(l log.Logger) *MockCatalog

func (*MockCatalog) Datacenters

func (m *MockCatalog) Datacenters() ([]string, error)

func (*MockCatalog) Service

func (m *MockCatalog) Service(service, tag string, q *api.QueryOptions) ([]*api.CatalogService, *api.QueryMeta, error)

type ServiceClient

type ServiceClient struct {
	// contains filtered or unexported fields
}

ServiceClient handles task and agent service registration with Consul.

func NewServiceClient

func NewServiceClient(consulClient AgentAPI, logger log.Logger, isNomadClient bool) *ServiceClient

NewServiceClient creates a new Consul ServiceClient from an existing Consul API Client, logger and takes whether the client is being used by a Nomad Client agent. When being used by a Nomad client, this Consul client reconciles all services and checks created by Nomad on behalf of running tasks.

func (*ServiceClient) AllocRegistrations

func (c *ServiceClient) AllocRegistrations(allocID string) (*AllocRegistration, error)

AllocRegistrations returns the registrations for the given allocation. If the allocation has no reservations, the response is a nil object.

func (*ServiceClient) RegisterAgent

func (c *ServiceClient) RegisterAgent(role string, services []*structs.Service) error

RegisterAgent registers Nomad agents (client or server). The Service.PortLabel should be a literal port to be parsed with SplitHostPort. Script checks are not supported and will return an error. Registration is asynchronous.

Agents will be deregistered when Shutdown is called.

func (*ServiceClient) RegisterTask

func (c *ServiceClient) RegisterTask(task *TaskServices) error

RegisterTask with Consul. Adds all service entries and checks to Consul. If exec is nil and a script check exists an error is returned.

If the service IP is set it used as the address in the service registration. Checks will always use the IP from the Task struct (host's IP).

Actual communication with Consul is done asynchronously (see Run).

func (*ServiceClient) RemoveTask

func (c *ServiceClient) RemoveTask(task *TaskServices)

RemoveTask from Consul. Removes all service entries and checks.

Actual communication with Consul is done asynchronously (see Run).

func (*ServiceClient) Run

func (c *ServiceClient) Run()

Run the Consul main loop which retries operations against Consul. It should be called exactly once.

func (*ServiceClient) Shutdown

func (c *ServiceClient) Shutdown() error

Shutdown the Consul client. Update running task registrations and deregister agent from Consul. On first call blocks up to shutdownWait before giving up on syncing operations.

func (*ServiceClient) UpdateTask

func (c *ServiceClient) UpdateTask(old, newTask *TaskServices) error

UpdateTask in Consul. Does not alter the service if only checks have changed.

DriverNetwork must not change between invocations for the same allocation.

type ServiceRegistration

type ServiceRegistration struct {

	// Service is the AgentService registered in Consul.
	Service *api.AgentService

	// Checks is the status of the registered checks.
	Checks []*api.AgentCheck
	// contains filtered or unexported fields
}

ServiceRegistration holds the status of a registered Consul Service and its Checks.

type TaskRegistration

type TaskRegistration struct {
	Services map[string]*ServiceRegistration
}

TaskRegistration holds the status of services registered for a particular task.

type TaskRestarter

type TaskRestarter interface {
	Restart(ctx context.Context, event *structs.TaskEvent, failure bool) error
}

TaskRestarter allows the checkWatcher to restart tasks.

type TaskServices

type TaskServices struct {
	AllocID string

	// Name of the task
	Name string

	// Canary indicates whether or not the allocation is a canary
	Canary bool

	// Restarter allows restarting the task depending on the task's
	// check_restart stanzas.
	Restarter TaskRestarter

	// Services and checks to register for the task.
	Services []*structs.Service

	// Networks from the task's resources stanza.
	Networks structs.Networks

	// DriverExec is the script executor for the task's driver.
	DriverExec interfaces.ScriptExecutor

	// DriverNetwork is the network specified by the driver and may be nil.
	DriverNetwork *drivers.DriverNetwork
}

func NewTaskServices

func NewTaskServices(alloc *structs.Allocation, task *structs.Task, restarter TaskRestarter, exec interfaces.ScriptExecutor, net *drivers.DriverNetwork) *TaskServices

func (*TaskServices) Copy

func (t *TaskServices) Copy() *TaskServices

Copy method for easing tests