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/
datastore.go
126 lines (103 loc) · 2.81 KB
/
datastore.go
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package datastore
import (
"fmt"
"net"
"code.cloudfoundry.org/filelock"
"code.cloudfoundry.org/silk/lib/serial"
)
//go:generate counterfeiter -o ../fakes/file_locker.go --fake-name FileLocker . FileLocker
type FileLocker interface {
filelock.FileLocker
}
//go:generate counterfeiter -o ../fakes/locked_file.go --fake-name LockedFile . LockedFile
type LockedFile interface {
filelock.LockedFile
}
//go:generate counterfeiter -o ../fakes/datastore.go --fake-name Datastore . Datastore
type Datastore interface {
Add(handle, ip string, metadata map[string]interface{}) error
Delete(handle string) (Container, error)
ReadAll() (map[string]Container, error)
}
type Container struct {
Handle string `json:"handle"`
IP string `json:"ip"`
Metadata map[string]interface{} `json:"metadata"`
}
type Store struct {
Serializer serial.Serializer
LockerNew func(filePath string) filelock.FileLocker
}
func validate(handle, ip string) error {
if handle == "" {
return fmt.Errorf("invalid handle")
}
if net.ParseIP(ip) == nil {
return fmt.Errorf("invalid ip: %v", ip)
}
return nil
}
func (c *Store) Add(filePath, handle, ip string, metadata map[string]interface{}) error {
if err := validate(handle, ip); err != nil {
return err
}
locker := c.LockerNew(filePath)
file, err := locker.Open()
if err != nil {
return fmt.Errorf("open lock: %s", err)
}
defer file.Close()
pool := make(map[string]Container)
err = c.Serializer.DecodeAll(file, &pool)
if err != nil {
return fmt.Errorf("decoding file: %s", err)
}
pool[handle] = Container{
Handle: handle,
IP: ip,
Metadata: metadata,
}
err = c.Serializer.EncodeAndOverwrite(file, pool)
if err != nil {
return fmt.Errorf("encode and overwrite: %s", err)
}
return nil
}
func (c *Store) Delete(filePath, handle string) (Container, error) {
deleted := Container{}
if handle == "" {
return deleted, fmt.Errorf("invalid handle")
}
locker := c.LockerNew(filePath)
file, err := locker.Open()
if err != nil {
return deleted, fmt.Errorf("open lock: %s", err)
}
defer file.Close()
pool := make(map[string]Container)
err = c.Serializer.DecodeAll(file, &pool)
if err != nil {
return deleted, fmt.Errorf("decoding file: %s", err)
}
deleted = pool[handle]
delete(pool, handle)
err = c.Serializer.EncodeAndOverwrite(file, pool)
if err != nil {
return deleted, fmt.Errorf("encode and overwrite: %s", err)
}
return deleted, nil
}
func (c *Store) ReadAll(filePath string) (map[string]Container, error) {
locker := c.LockerNew(filePath)
file, err := locker.Open()
if err != nil {
return nil, fmt.Errorf("open lock: %s", err)
}
defer file.Close()
pool := make(map[string]Container)
err = c.Serializer.DecodeAll(file, &pool)
if err != nil {
return nil, fmt.Errorf("decoding file: %s", err)
}
return pool, nil
}