forked from RediSearch/redisearch-go
/
autocomplete.go
181 lines (154 loc) · 4.25 KB
/
autocomplete.go
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package redisearch
import (
"strconv"
"github.com/gomodule/redigo/redis"
)
// Autocompleter implements a redisearch auto-completer API
type Autocompleter struct {
name string
pool *redis.Pool
}
// NewAutocompleter creates a new Autocompleter with the given pool and key name
func NewAutocompleterFromPool(pool *redis.Pool, name string) *Autocompleter {
return &Autocompleter{name: name, pool: pool}
}
// NewAutocompleter creates a new Autocompleter with the given host and key name
func NewAutocompleter(addr, name string) *Autocompleter {
return &Autocompleter{
pool: redis.NewPool(func() (redis.Conn, error) {
return redis.Dial("tcp", addr)
}, maxConns),
name: name,
}
}
// Delete deletes the Autocompleter key for this AC
func (a *Autocompleter) Delete() error {
conn := a.pool.Get()
defer conn.Close()
_, err := conn.Do("DEL", a.name)
return err
}
// AddTerms pushes new term suggestions to the index
func (a *Autocompleter) AddTerms(terms ...Suggestion) error {
conn := a.pool.Get()
defer conn.Close()
i := 0
for _, term := range terms {
args := redis.Args{a.name, term.Term, term.Score}
if term.Payload != "" {
args = append(args, "PAYLOAD", term.Payload)
}
if err := conn.Send("FT.SUGADD", args...); err != nil {
return err
}
i++
}
if err := conn.Flush(); err != nil {
return err
}
for i > 0 {
if _, err := conn.Receive(); err != nil {
return err
}
i--
}
return nil
}
// AddTerms pushes new term suggestions to the index
func (a *Autocompleter) DeleteTerms(terms ...Suggestion) error {
conn := a.pool.Get()
defer conn.Close()
i := 0
for _, term := range terms {
args := redis.Args{a.name, term.Term}
if err := conn.Send("FT.SUGDEL", args...); err != nil {
return err
}
i++
}
if err := conn.Flush(); err != nil {
return err
}
for i > 0 {
if _, err := conn.Receive(); err != nil {
return err
}
i--
}
return nil
}
// AddTerms pushes new term suggestions to the index
func (a *Autocompleter) Length() (len int64, err error) {
conn := a.pool.Get()
defer conn.Close()
len, err = redis.Int64(conn.Do("FT.SUGLEN", a.name))
return
}
// Suggest gets completion suggestions from the Autocompleter dictionary to the given prefix.
// If fuzzy is set, we also complete for prefixes that are in 1 Levenshten distance from the
// given prefix
//
// Deprecated: Please use SuggestOpts() instead
func (a *Autocompleter) Suggest(prefix string, num int, fuzzy bool) (ret []Suggestion, err error) {
conn := a.pool.Get()
defer conn.Close()
seropts := DefaultSuggestOptions
seropts.Num = num
seropts.Fuzzy = fuzzy
args, inc := a.Serialize(prefix, seropts)
vals, err := redis.Strings(conn.Do("FT.SUGGET", args...))
if err != nil {
return nil, err
}
ret = ProcessSugGetVals(vals, inc, true, false)
return
}
// SuggestOpts gets completion suggestions from the Autocompleter dictionary to the given prefix.
// SuggestOptions are passed allowing you specify if the returned values contain a payload, and scores.
// If SuggestOptions.Fuzzy is set, we also complete for prefixes that are in 1 Levenshtein distance from the
// given prefix
func (a *Autocompleter) SuggestOpts(prefix string, opts SuggestOptions) (ret []Suggestion, err error) {
conn := a.pool.Get()
defer conn.Close()
args, inc := a.Serialize(prefix, opts)
vals, err := redis.Strings(conn.Do("FT.SUGGET", args...))
if err != nil {
return nil, err
}
ret = ProcessSugGetVals(vals, inc, opts.WithScores, opts.WithPayloads)
return
}
func (a *Autocompleter) Serialize(prefix string, opts SuggestOptions) (redis.Args, int) {
inc := 1
args := redis.Args{a.name, prefix, "MAX", opts.Num}
if opts.Fuzzy {
args = append(args, "FUZZY")
}
if opts.WithScores {
args = append(args, "WITHSCORES")
inc++
}
if opts.WithPayloads {
args = append(args, "WITHPAYLOADS")
inc++
}
return args, inc
}
func ProcessSugGetVals(vals []string, inc int, WithScores, WithPayloads bool) (ret []Suggestion) {
ret = make([]Suggestion, 0, len(vals)/inc)
for i := 0; i < len(vals); i += inc {
suggestion := Suggestion{Term: vals[i]}
if WithScores {
score, err := strconv.ParseFloat(vals[i+1], 64)
if err != nil {
continue
}
suggestion.Score = score
}
if WithPayloads {
suggestion.Payload = vals[i+(inc-1)]
}
ret = append(ret, suggestion)
}
return
}