An easy way to write and read golang data structures to disk to be used as a cache.
To allow my CLIs that load data from the network to conserve them for some times for consecutive usage. eg. fetching a list of Namespaces from a Kubernetes cluster, this is an information that don't change very often and i can reuse the data between different stateless command usage.
using the method GetIfMaxAge(string, time.Duration) will not return the data if older than time.Duration
Check the examples .
package main
import (
"github.com/kandros/diskcache"
"github.com/sanity-io/litter"
"github.com/spf13/afero"
)
func main() {
fs := afero.NewOsFs()
dc := diskcache.New(fs, "mytest")
type a struct {
Name string
}
aa := a{Name: "jaga"}
dc.Set("mydata", aa)
bb := &a{} /* Name: "" */
litter.Dump(bb)
err := dc.Get("mydata", bb)
if err != nil {
litter.Dump(err.Error())
return
}
litter.Dump(bb) /* Name: "jaga" */
}
package main
import (
"time"
"github.com/kandros/diskcache"
"github.com/sanity-io/litter"
"github.com/spf13/afero"
)
func main() {
fs := afero.NewOsFs()
dc := diskcache.New(fs, "mytest")
type a struct {
Name string
}
aa := a{Name: "jaga"}
dc.Set("my_data_with_max_age", aa)
bb := &a{}
litter.Dump(bb)
time.Sleep(3)
err := dc.GetIfMaxAge("mydata", bb, 1*time.Second)
litter.Dump(err.Error()) /* expired */
}
- https://github.com/spf13/afero to have a testable filesystem in memory
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