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pivot.go
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pivot.go
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package pivot
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path"
"path/filepath"
"sort"
"strings"
"time"
"github.com/ghetzel/go-stockutil/fileutil"
"github.com/ghetzel/go-stockutil/log"
"github.com/ghetzel/go-stockutil/sliceutil"
"github.com/ghetzel/go-stockutil/typeutil"
"github.com/ghetzel/pivot/v3/backends"
"github.com/ghetzel/pivot/v3/dal"
"github.com/ghetzel/pivot/v3/filter"
"github.com/ghodss/yaml"
)
// create handy type aliases to avoid importing from all over the place
type Backend = backends.Backend
type Model = backends.Mapper
type Collection = dal.Collection
type Record = dal.Record
type RecordSet = dal.RecordSet
type Filter = filter.Filter
var MonitorCheckInterval = time.Duration(10) * time.Second
var NetrcFile = ``
// Create a new database connection with the given options.
func NewDatabaseWithOptions(connection string, options backends.ConnectOptions) (DB, error) {
if cs, err := dal.ParseConnectionString(connection); err == nil {
if NetrcFile != `` {
if err := cs.LoadCredentialsFromNetrc(NetrcFile); err != nil {
return nil, err
}
}
if backend, err := backends.MakeBackend(cs); err == nil {
// set indexer
if options.Indexer != `` {
if ics, err := dal.ParseConnectionString(options.Indexer); err == nil {
if NetrcFile != `` {
if err := ics.LoadCredentialsFromNetrc(NetrcFile); err != nil {
return nil, err
}
}
if err := backend.SetIndexer(ics); err != nil {
return nil, err
}
} else {
return nil, err
}
}
// TODO: add MultiIndexer if AdditionalIndexers is present
if !options.SkipInitialize {
if err := backend.Initialize(); err != nil {
return nil, err
}
}
return newdb(backend), nil
} else {
return nil, err
}
} else {
return nil, err
}
}
// Create a new database connection with the default options.
func NewDatabase(connection string) (DB, error) {
return NewDatabaseWithOptions(connection, backends.ConnectOptions{})
}
// Loads and registers a JSON-encoded array of dal.Collection objects into the given DB backend instance.
func LoadSchemataFromFile(filename string) ([]*dal.Collection, error) {
if file, err := os.Open(filename); err == nil {
var collections []*dal.Collection
var merr error
switch ext := path.Ext(filename); ext {
case `.json`:
if err := json.NewDecoder(file).Decode(&collections); err != nil {
return nil, fmt.Errorf("decode error: %v", err)
}
case `.yml`, `.yaml`:
if data, err := ioutil.ReadAll(file); err == nil {
if err := yaml.Unmarshal(data, &collections); err != nil {
return nil, fmt.Errorf("decode error: %v", err)
}
} else {
return nil, err
}
default:
return nil, nil
}
for _, collection := range collections {
merr = log.AppendError(merr, collection.Check())
}
return collections, merr
} else {
return nil, err
}
}
// Calls LoadSchemataFromFile from all *.json files in the given directory.
func ApplySchemata(fileOrDirPath string, db Backend) error {
var loadedCollections []*dal.Collection
var filenames []string
if fileutil.DirExists(fileOrDirPath) {
if fns, err := filepath.Glob(filepath.Join(fileOrDirPath, `*.json`)); err == nil {
filenames = fns
} else {
return fmt.Errorf("Cannot list directory %q: %v", fileOrDirPath, err)
}
} else if fileutil.IsNonemptyFile(fileOrDirPath) {
filenames = append(filenames, fileOrDirPath)
} else if fns, err := filepath.Glob(fileOrDirPath); err == nil {
filenames = fns
} else {
return fmt.Errorf("Cannot load schemata from %q", fileOrDirPath)
}
sort.Strings(filenames)
for _, filename := range filenames {
if collections, err := LoadSchemataFromFile(filename); err == nil {
if len(collections) == 0 {
continue
}
log.Infof("Loaded %d definitions from %v", len(collections), filename)
for _, collection := range collections {
db.RegisterCollection(collection)
loadedCollections = append(loadedCollections, collection)
}
} else {
return fmt.Errorf("Cannot load schema file %q: %v", filename, err)
}
}
for _, schema := range loadedCollections {
if _, err := db.GetCollection(schema.Name); err == nil {
continue
} else if dal.IsCollectionNotFoundErr(err) {
if err := db.CreateCollection(schema); err == nil {
log.Noticef("[%v] Created collection %q", db, schema.Name)
} else {
log.Errorf("Cannot create collection %q: %v", schema.Name, err)
}
} else {
return fmt.Errorf("Cannot verify collection %q: %v", schema.Name, err)
}
}
return nil
}
// Loads a JSON-encoded array of dal.Record objects from a file into the given DB backend instance.
func LoadFixturesFromFile(filename string, db Backend) error {
filename = fileutil.MustExpandUser(filename)
if file, err := os.Open(filename); err == nil {
commentRemover := fileutil.NewReadManipulator(file, fileutil.RemoveLinesWithPrefix(`//`, true))
defer commentRemover.Close()
var records []*dal.Record
if err := json.NewDecoder(commentRemover).Decode(&records); err == nil {
var collections []string
for _, record := range records {
// if no collection name was explicitly provided, infer it from the filename
if record.CollectionName == `` {
record.CollectionName = strings.TrimSuffix(filepath.Base(filename), filepath.Ext(filename))
}
collections = append(collections, record.CollectionName)
}
collections = sliceutil.UniqueStrings(collections)
for _, name := range collections {
if collection, err := db.GetCollection(name); err == nil {
var i int
for _, record := range records {
if record.CollectionName != name {
continue
}
var err error
if typeutil.IsArray(record.ID) {
if err := record.SetKeys(collection, dal.PersistOperation, sliceutil.Sliceify(record.ID)...); err != nil {
return fmt.Errorf("%s id %v: %v", name, record.ID, err)
}
}
if db.Exists(collection.Name, record) {
err = db.Update(collection.Name, dal.NewRecordSet(record))
} else {
err = db.Insert(collection.Name, dal.NewRecordSet(record))
}
if err != nil {
return fmt.Errorf("Cannot load collection %q, record %v: %v", name, record.ID, err)
}
i += 1
}
log.Infof("Collection %q: loaded %d records", name, i)
} else {
return fmt.Errorf("Cannot load collection %q: %v", name, err)
}
}
return nil
} else {
return fmt.Errorf("Cannot decode fixture file %q: %v", filename, err)
}
} else {
return fmt.Errorf("Cannot load fixture file %q: %v", filename, err)
}
}
// Calls LoadFixturesFromFile from all *.json files in the given directory.
func LoadFixtures(fileOrDirPath string, db Backend) error {
if fileutil.DirExists(fileOrDirPath) || strings.Contains(fileOrDirPath, `*`) {
var glob string
// if it looks like we were given a wildcard, trust it. otherwise,
// add one ourselves.
if strings.Contains(fileOrDirPath, `*`) {
glob = fileOrDirPath
} else {
glob = filepath.Join(fileOrDirPath, `*.json`)
}
if filenames, err := filepath.Glob(glob); err == nil {
sort.Strings(filenames)
for _, filename := range filenames {
if err := LoadFixturesFromFile(filename, db); err != nil {
return err
}
}
} else {
return fmt.Errorf("Cannot list directory %q: %v", fileOrDirPath, err)
}
} else if fileutil.IsNonemptyFile(fileOrDirPath) {
return LoadFixturesFromFile(fileOrDirPath, db)
} else {
return fmt.Errorf("Cannot load fixtures from %q", fileOrDirPath)
}
return nil
}
// A panicky version of backends.Backend.GetCollection
func MustGetCollection(db Backend, name string) *dal.Collection {
if collection, err := db.GetCollection(name); err == nil {
return collection
} else {
panic(fmt.Sprintf("Cannot get collection %q: %v", name, err))
}
}