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storage_json.go
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/
storage_json.go
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package main
import (
"fmt"
"log"
scribble "github.com/nanobox-io/golang-scribble"
)
const (
// Collection identifier for JSON collection about Metric
Collection = "metrics"
// DefaultPathStorageJSON is a default path to storage JSON
// when the STORAGE_URL env/config is not set
DefaultPathStorageJSON = "./data/"
)
// StorageJSON is the data storage layer using JSON file
type StorageJSON struct {
db *scribble.Driver
}
// NewStorageJSON create a new driver to storage JSON in file
func NewStorageJSON(location string) (*StorageJSON, error) {
var err error
stg := new(StorageJSON)
if len(location) < 1 {
location = DefaultPathStorageJSON
}
stg.db, err = scribble.New(location, nil)
if err != nil {
return nil, err
}
return stg, nil
}
func getFileNameJSON(metric Metric) string {
timestampFormat := "20060102_150405.000"
timeOfMetric := metric.Timestamp.Format(timestampFormat)
name := metric.Prefix
if len(name) < 1 {
name = metric.Hostname
}
return fmt.Sprintf("%s_%s", name, timeOfMetric)
}
// SaveMetric save a new metric
func (s *StorageJSON) SaveMetric(metric Metric) error {
log.Printf("metric: %+v\n", metric)
filename := getFileNameJSON(metric)
if err := s.db.Write(Collection, filename, metric); err != nil {
return err
}
return nil
}
// SaveItem save a new metric with SaveMetric
func (s *StorageJSON) SaveItem(metric Metric) error {
return s.SaveMetric(metric)
}
// ItemExists check with item exist
// not implemented to JSON, only function signature
func (s *StorageJSON) ItemExists(metric Metric) (found bool) {
return found
}