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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| // Copyright (c) 2016-2019, Jan Cajthaml <jan.cajthaml@gmail.com> | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package metrics | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "io" | ||
| "os" | ||
| "strconv" | ||
|
|
||
| "github.com/jancajthaml-openbank/cnb-rates-batch/utils" | ||
| ) | ||
|
|
||
| // MarshalJSON serialises Metrics as json preserving uint64 | ||
| func (entity *Metrics) MarshalJSON() ([]byte, error) { | ||
| var buffer bytes.Buffer | ||
|
|
||
| buffer.WriteString("{\"daysProcessed\":") | ||
| buffer.WriteString(strconv.FormatInt(entity.daysProcessed.Count(), 10)) | ||
| buffer.WriteString(",\"monthsProcessed\":") | ||
| buffer.WriteString(strconv.FormatInt(entity.monthsProcessed.Count(), 10)) | ||
| buffer.WriteString("}") | ||
|
|
||
| return buffer.Bytes(), nil | ||
| } | ||
|
|
||
| // UnmarshalJSON unmarshal json of Metrics entity | ||
| func (entity *Metrics) UnmarshalJSON(data []byte) error { | ||
| if entity == nil { | ||
| return fmt.Errorf("cannot unmarshall to nil pointer") | ||
| } | ||
| all := struct { | ||
| DaysProcessed int64 `json:"daysProcessed"` | ||
| MonthsProcessed int64 `json:"monthsProcessed"` | ||
| }{} | ||
| err := utils.JSON.Unmarshal(data, &all) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| entity.daysProcessed.Clear() | ||
| entity.daysProcessed.Inc(all.DaysProcessed) | ||
|
|
||
| entity.monthsProcessed.Clear() | ||
| entity.monthsProcessed.Inc(all.MonthsProcessed) | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (metrics *Metrics) Persist() error { | ||
| if metrics == nil { | ||
| return fmt.Errorf("cannot persist nil reference") | ||
| } | ||
| tempFile := metrics.output + "_temp" | ||
| data, err := utils.JSON.Marshal(metrics) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| f, err := os.OpenFile(tempFile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, os.ModePerm) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer f.Close() | ||
| if _, err := f.Write(data); err != nil { | ||
| return err | ||
| } | ||
| if err := os.Rename(tempFile, metrics.output); err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (metrics *Metrics) Hydrate() error { | ||
| if metrics == nil { | ||
| return fmt.Errorf("cannot hydrate nil reference") | ||
| } | ||
| f, err := os.OpenFile(metrics.output, os.O_RDONLY, os.ModePerm) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer f.Close() | ||
| fi, err := f.Stat() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| buf := make([]byte, fi.Size()) | ||
| _, err = f.Read(buf) | ||
| if err != nil && err != io.EOF { | ||
| return err | ||
| } | ||
| err = utils.JSON.Unmarshal(buf, metrics) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } |
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