micro/runtime/runtime.go

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// Package runtime is a service runtime manager
package runtime
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import (
"errors"
"time"
"github.com/unistack-org/micro/v3/metadata"
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)
var (
// ErrAlreadyExists error
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ErrAlreadyExists = errors.New("already exists")
)
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// Runtime is a service runtime manager
type Runtime interface {
// Init initializes runtime
Init(...Option) error
// Create registers a service
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Create(*Service, ...CreateOption) error
// Read returns the service
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Read(...ReadOption) ([]*Service, error)
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// Update the service in place
Update(*Service, ...UpdateOption) error
// Remove a service
Delete(*Service, ...DeleteOption) error
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// Logs returns the logs for a service
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Logs(*Service, ...LogsOption) (Logs, error)
// Start starts the runtime
Start() error
// Stop shuts down the runtime
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Stop() error
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// String describes runtime
String() string
}
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// Logs returns a log stream
type Logs interface {
// Error retuns error
Error() error
// Chan return chan log
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Chan() chan Log
// Stop stops the log stream
Stop() error
}
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// Log is a log message
type Log struct {
// Metadata holds metadata
Metadata metadata.Metadata
// Message holds the message
Message string
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}
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// Scheduler is a runtime service scheduler
type Scheduler interface {
// Notify publishes schedule events
Notify() (<-chan Event, error)
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// Close stops the scheduler
Close() error
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}
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// EventType defines schedule event
type EventType int
const (
// Create is emitted when a new build has been craeted
Create EventType = iota
// Update is emitted when a new update become available
Update
// Delete is emitted when a build has been deleted
Delete
)
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// String returns human readable event type
func (t EventType) String() string {
switch t {
case Create:
return "create"
case Delete:
return "delete"
case Update:
return "update"
default:
return "unknown"
}
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}
// Event is notification event
type Event struct {
// Timestamp of event
Timestamp time.Time
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// Service the event relates to
Service *Service
// Options to use when processing the event
Options *CreateOptions
// ID of the event
ID string
// Type is event type
Type EventType
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}
// Service is runtime service
type Service struct {
// Metadata stores metadata
Metadata metadata.Metadata
// Name of the service
Name string
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// Version of the service
Version string
// Name of the service
Source string
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}
// Resources which are allocated to a serivce
type Resources struct {
// CPU is the maximum amount of CPU the service will be allocated (unit millicpu)
// e.g. 0.25CPU would be passed as 250
CPU int
// Mem is the maximum amount of memory the service will be allocated (unit mebibyte)
// e.g. 128 MiB of memory would be passed as 128
Mem int
// Disk is the maximum amount of disk space the service will be allocated (unit mebibyte)
// e.g. 128 MiB of memory would be passed as 128
Disk int
}