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constellation.go
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constellation.go
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package constellation
import (
"fmt"
"github.com/patrickmn/go-cache"
"time"
)
func copyBytes(b []byte) []byte {
ob := make([]byte, len(b))
copy(ob, b)
return ob
}
type Constellation struct {
node *Client
c *cache.Cache
}
func (g *Constellation) Send(data []byte, from string, to []string) (out []byte, err error) {
if len(data) > 0 {
if len(to) == 0 {
out = copyBytes(data)
} else {
var err error
out, err = g.node.SendPayload(data, from, to)
if err != nil {
return nil, err
}
}
}
g.c.Set(string(out), data, cache.DefaultExpiration)
return out, nil
}
func (g *Constellation) Receive(data []byte) ([]byte, error) {
if len(data) == 0 {
return data, nil
}
// Ignore this error since not being a recipient of
// a payload isn't an error.
// TODO: Return an error if it's anything OTHER than
// 'you are not a recipient.'
dataStr := string(data)
x, found := g.c.Get(dataStr)
if found {
return x.([]byte), nil
}
pl, _ := g.node.ReceivePayload(data)
g.c.Set(dataStr, pl, cache.DefaultExpiration)
return pl, nil
}
func New(configPath string) (*Constellation, error) {
cfg, err := LoadConfig(configPath)
if err != nil {
return nil, err
}
err = RunNode(configPath, cfg.SocketPath)
if err != nil {
return nil, err
}
n, err := NewClient(cfg.PublicKeyPath, cfg.SocketPath)
if err != nil {
return nil, err
}
return &Constellation{
node: n,
c: cache.New(5*time.Minute, 5*time.Minute),
}, nil
}
func MustNew(configPath string) *Constellation {
g, err := New(configPath)
if err != nil {
panic(fmt.Sprintf("MustNew error: %v", err))
}
return g
}
func MaybeNew(configPath string) *Constellation {
if configPath == "" {
return nil
}
return MustNew(configPath)
}