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// Package state records which Multicase vouchers have been sent, so a
// re-run of the same or an overlapping export does not book them twice.
// Accounted's idempotency keys expire after 24 hours; this file does not.
package state
import (
"encoding/json"
"errors"
"io/fs"
"os"
"path/filepath"
"time"
)
type Record struct {
CompanyID string `json:"company_id"`
EntryID string `json:"entry_id"`
Status string `json:"status"` // "draft" or "posted"
VoucherSeries string `json:"voucher_series,omitempty"`
VoucherNumber int `json:"voucher_number,omitempty"`
Hash string `json:"hash"`
UpdatedAt time.Time `json:"updated_at"`
}
type File struct {
path string
Entries map[string]Record `json:"entries"`
}
func Load(path string) (*File, error) {
f := &File{path: path, Entries: map[string]Record{}}
b, err := os.ReadFile(path)
if errors.Is(err, fs.ErrNotExist) {
return f, nil
}
if err != nil {
return nil, err
}
if err := json.Unmarshal(b, f); err != nil {
return nil, err
}
if f.Entries == nil {
f.Entries = map[string]Record{}
}
return f, nil
}
func key(companyID, sourceID string) string {
return companyID + "/" + sourceID
}
func (f *File) Get(companyID, sourceID string) (Record, bool) {
r, ok := f.Entries[key(companyID, sourceID)]
return r, ok
}
// Put stores the record and writes the file, so progress survives a crash
// halfway through a run.
func (f *File) Put(sourceID string, r Record) error {
r.UpdatedAt = time.Now().UTC()
f.Entries[key(r.CompanyID, sourceID)] = r
b, err := json.MarshalIndent(f, "", " ")
if err != nil {
return err
}
tmp, err := os.CreateTemp(filepath.Dir(f.path), ".state-*")
if err != nil {
return err
}
defer os.Remove(tmp.Name())
if _, err := tmp.Write(b); err != nil {
tmp.Close()
return err
}
if err := tmp.Close(); err != nil {
return err
}
return os.Rename(tmp.Name(), f.path)
}
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