forked from ghetzel/pivot
/
redis.go
426 lines (353 loc) · 10.1 KB
/
redis.go
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package backends
import (
"encoding/json"
"fmt"
"strings"
"sync"
"time"
"github.com/ghetzel/go-stockutil/maputil"
"github.com/ghetzel/go-stockutil/sliceutil"
"github.com/ghetzel/go-stockutil/stringutil"
"github.com/ghetzel/go-stockutil/utils"
"github.com/ghetzel/pivot/dal"
"github.com/ghetzel/pivot/filter"
"github.com/gomodule/redigo/redis"
)
var redisDefaultKeyPrefix = `pivot.`
var redisDefaultPingTimeout = 5 * time.Second
var redisDefaultCommandTimeout = 20 * time.Second
type RedisBackend struct {
Backend
cs dal.ConnectionString
pool *redis.Pool
registeredCollections sync.Map
indexer Indexer
keyPrefix string
timeout time.Duration
cmdTimeout time.Duration
}
func NewRedisBackend(connection dal.ConnectionString) Backend {
return &RedisBackend{
cs: connection,
keyPrefix: redisDefaultKeyPrefix,
timeout: redisDefaultPingTimeout,
}
}
func (self *RedisBackend) String() string {
return `redis`
}
func (self *RedisBackend) GetConnectionString() *dal.ConnectionString {
return &self.cs
}
func (self *RedisBackend) Ping(timeout time.Duration) error {
errchan := make(chan error)
go func() {
if _, err := self.run(`PING`); err == nil {
errchan <- nil
} else {
errchan <- fmt.Errorf("Backend unavailable: %v", err)
}
}()
select {
case err := <-errchan:
return err
case <-time.After(timeout):
return fmt.Errorf("Backend unavailable: timed out after waiting %v", timeout)
}
}
func (self *RedisBackend) RegisterCollection(collection *dal.Collection) {
self.registeredCollections.Store(collection.Name, collection)
}
func (self *RedisBackend) SetIndexer(indexConnString dal.ConnectionString) error {
if indexer, err := MakeIndexer(indexConnString); err == nil {
self.indexer = indexer
return nil
} else {
return err
}
}
func (self *RedisBackend) Initialize() error {
if self.cs.HasOpt(`prefix`) {
self.keyPrefix = self.cs.OptString(`prefix`, ``)
}
self.timeout = self.cs.OptDuration(`timeout`, redisDefaultPingTimeout)
self.cmdTimeout = self.cs.OptDuration(`callTimeout`, redisDefaultCommandTimeout)
if err := self.connect(); err != nil {
return err
}
if self.cs.OptBool(`autoregister`, DefaultAutoregister) {
if err := self.refreshCollections(); err != nil {
return err
}
}
if self.indexer != nil {
if err := self.indexer.IndexInitialize(self); err != nil {
return err
}
}
return self.Ping(self.timeout)
}
func (self *RedisBackend) Insert(name string, recordset *dal.RecordSet) error {
return self.upsert(true, name, recordset)
}
func (self *RedisBackend) Exists(name string, id interface{}) bool {
if i, err := redis.Int(self.run(`EXISTS`, self.key(name, id))); err == nil && i == 1 {
return true
} else {
return false
}
}
func (self *RedisBackend) Retrieve(name string, id interface{}, fields ...string) (*dal.Record, error) {
if collection, err := self.GetCollection(name); err == nil {
if dbfields, err := redis.Strings(self.run(`HGETALL`, self.key(collection.Name, id))); err == nil {
record := dal.NewRecord(id)
for _, pair := range sliceutil.Chunks(dbfields, 2) {
if len(pair) == 2 {
fieldName := fmt.Sprintf("%v", pair[0])
fieldValue := fmt.Sprintf("%v", pair[1])
if len(fields) == 0 || sliceutil.ContainsString(fields, fieldName) {
if value, err := self.decode(collection, fieldName, fieldValue); err == nil {
record.Set(fieldName, value)
}
}
}
}
if collection.IdentityFieldType != dal.StringType {
record.ID = stringutil.Autotype(record.ID)
}
// do this AFTER populating the record's fields from the database
if err := record.Populate(record, collection); err != nil {
return nil, err
}
return record, nil
} else {
return nil, err
}
} else {
return nil, err
}
}
func (self *RedisBackend) Update(name string, recordset *dal.RecordSet, target ...string) error {
return self.upsert(false, name, recordset)
}
func (self *RedisBackend) Delete(name string, ids ...interface{}) error {
if collection, err := self.GetCollection(name); err == nil {
var merr error
for _, id := range ids {
if _, err := self.run(`DEL`, self.key(collection.Name, id)); err != nil {
merr = utils.AppendError(merr, err)
}
}
return merr
} else {
return err
}
}
func (self *RedisBackend) WithSearch(collection *dal.Collection, filters ...*filter.Filter) Indexer {
return self.indexer
}
func (self *RedisBackend) WithAggregator(collection *dal.Collection) Aggregator {
return nil
}
func (self *RedisBackend) ListCollections() ([]string, error) {
return maputil.StringKeys(&self.registeredCollections), nil
}
func (self *RedisBackend) CreateCollection(definition *dal.Collection) error {
// write the schema definition to the schema key
if data, err := json.Marshal(definition); err == nil {
schemaKey := self.key(definition.Name, `__schema__`)
if out, err := redis.String(self.run(
`SET`,
schemaKey,
data,
`NX`,
)); err != nil {
return err
} else if out != `OK` {
return fmt.Errorf("Collection %q already exists", definition.Name)
}
self.RegisterCollection(definition)
return nil
} else {
return err
}
}
func (self *RedisBackend) DeleteCollection(name string) error {
if keys, err := redis.Strings(self.run(`KEYS`, self.key(name, `*`))); err == nil {
var merr error
for _, key := range keys {
if _, err := self.run(`DEL`, key); err != nil {
merr = utils.AppendError(merr, err)
}
}
return merr
} else {
return err
}
}
func (self *RedisBackend) GetCollection(name string) (*dal.Collection, error) {
if collectionI, ok := self.registeredCollections.Load(name); ok {
return collectionI.(*dal.Collection), nil
} else {
return nil, dal.CollectionNotFound
}
}
func (self *RedisBackend) Flush() error {
return nil
}
func (self *RedisBackend) key(collection string, id interface{}) string {
k := self.keyPrefix
if dataset := self.cs.Dataset(); dataset != `` {
k += dataset + `.`
}
k += collection
if id != nil {
k += fmt.Sprintf(":%v", id)
}
return k
}
func (self *RedisBackend) upsert(create bool, collectionName string, recordset *dal.RecordSet) error {
if collection, err := self.GetCollection(collectionName); err == nil {
var merr error
for _, record := range recordset.Records {
if r, err := collection.MakeRecord(record); err == nil {
record = r
} else {
return err
}
var key string = self.key(collectionName, record.ID)
var args []interface{}
for key, value := range record.Fields {
if encoded, err := self.encode(collection, key, value); err == nil {
if encoded != `` {
args = append(args, key)
args = append(args, encoded)
}
}
}
if len(args) > 0 {
if create && self.Exists(collectionName, record.ID) {
return fmt.Errorf("Record %q already exists", record.ID)
}
args = append([]interface{}{key}, args...)
if _, err := self.run(`HMSET`, args...); err != nil {
merr = utils.AppendError(merr, err)
}
}
}
if search := self.WithSearch(collection); search != nil {
if err := search.Index(collection, recordset); err != nil {
merr = utils.AppendError(merr, err)
}
}
return merr
} else {
return err
}
}
func (self *RedisBackend) encode(collection *dal.Collection, key string, value interface{}) (string, error) {
if field, ok := collection.GetField(key); ok {
var encoded string
switch field.Type {
case dal.ObjectType:
if data, err := json.Marshal(value); err == nil {
encoded = string(data)
} else {
return ``, err
}
default:
if enc, err := stringutil.ToString(value); err == nil {
encoded = enc
} else {
return ``, err
}
}
return encoded, nil
} else {
return ``, nil
}
}
func (self *RedisBackend) decode(collection *dal.Collection, key string, value string) (interface{}, error) {
if field, ok := collection.GetField(key); ok {
switch field.Type {
case dal.ObjectType:
var out map[string]interface{}
if err := json.Unmarshal([]byte(value), &out); err == nil {
return out, nil
} else {
return nil, err
}
default:
return field.ConvertValue(value)
}
} else {
return nil, fmt.Errorf("No such field %q", key)
}
}
func (self *RedisBackend) refreshCollections() error {
if schemata, err := redis.Strings(self.run(`KEYS`, self.key(`*`, `__schema__`))); err == nil {
var merr error
for _, key := range schemata {
merr = utils.AppendError(merr, self.refreshCollection(key))
}
return merr
} else {
return err
}
}
func (self *RedisBackend) refreshCollection(schemaKey string) error {
if _, err := self.GetCollection(self.collectionNameFromKey(schemaKey)); err == dal.CollectionNotFound {
if schemadef, err := redis.Bytes(self.run(`GET`, schemaKey)); err == nil {
var collection dal.Collection
if err := json.Unmarshal(schemadef, &collection); err == nil {
self.RegisterCollection(&collection)
return nil
} else {
return err
}
} else {
return err
}
} else {
return nil
}
}
func (self *RedisBackend) collectionNameFromKey(key string) string {
parts := strings.Split(key, `.`)
if len(parts) > 1 {
return parts[len(parts)-2]
} else {
return ``
}
}
// wraps the process of borrowing a connection from the pool and running a command
func (self *RedisBackend) run(cmd string, args ...interface{}) (interface{}, error) {
if conn := self.pool.Get(); conn != nil {
defer conn.Close()
querylog.Debugf("[%v] %v %v", self, cmd, strings.Join(sliceutil.Stringify(args), ` `))
return redis.DoWithTimeout(conn, self.cmdTimeout, cmd, args...)
} else {
return nil, fmt.Errorf("Failed to borrow Redis connection")
}
}
func (self *RedisBackend) connect() error {
self.pool = &redis.Pool{
MaxIdle: 3,
MaxActive: 1024,
Dial: func() (redis.Conn, error) {
options := []redis.DialOption{
redis.DialKeepAlive(self.timeout),
redis.DialConnectTimeout(self.timeout),
}
if _, p, ok := self.cs.Credentials(); ok {
options = append(options, redis.DialPassword(p))
}
return redis.Dial(
self.cs.Protocol(`tcp`),
self.cs.Host(),
options...,
)
},
}
return nil
}