/
url.go
133 lines (114 loc) · 3.17 KB
/
url.go
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package lcw
import (
"net/url"
"strconv"
"time"
"github.com/go-redis/redis/v7"
"github.com/hashicorp/go-multierror"
"github.com/pkg/errors"
)
// New parses uri and makes any of supported caches
// supported URIs:
// - redis://<ip>:<port>?db=123&max_keys=10
// - mem://lru?max_keys=10&max_cache_size=1024
// - mem://expirable?ttl=30s&max_val_size=100
// - nop://
func New(uri string) (LoadingCache, error) {
u, err := url.Parse(uri)
if err != nil {
return nil, errors.Wrapf(err, "parse cache uri %s", uri)
}
query := u.Query()
opts, err := optionsFromQuery(query)
if err != nil {
return nil, errors.Wrapf(err, "parse uri options %s", uri)
}
switch u.Scheme {
case "redis":
redisOpts, err := redisOptionsFromURL(u)
if err != nil {
return nil, err
}
res, err := NewRedisCache(redis.NewClient(redisOpts), opts...)
return res, errors.Wrapf(err, "make redis for %s", uri)
case "mem":
switch u.Hostname() {
case "lru":
return NewLruCache(opts...)
case "expirable":
return NewExpirableCache(opts...)
default:
return nil, errors.Errorf("unsupported mem cache type %s", u.Hostname())
}
case "nop":
return NewNopCache(), nil
}
return nil, errors.Errorf("unsupported cache type %s", u.Scheme)
}
func optionsFromQuery(q url.Values) (opts []Option, err error) {
errs := new(multierror.Error)
if v := q.Get("max_val_size"); v != "" {
vv, e := strconv.Atoi(v)
if e != nil {
errs = multierror.Append(errs, errors.Wrapf(e, "max_val_size query param %s", v))
} else {
opts = append(opts, MaxValSize(vv))
}
}
if v := q.Get("max_key_size"); v != "" {
vv, e := strconv.Atoi(v)
if e != nil {
errs = multierror.Append(errs, errors.Wrapf(e, "max_key_size query param %s", v))
} else {
opts = append(opts, MaxKeySize(vv))
}
}
if v := q.Get("max_keys"); v != "" {
vv, e := strconv.Atoi(v)
if e != nil {
errs = multierror.Append(errs, errors.Wrapf(e, "max_keys query param %s", v))
} else {
opts = append(opts, MaxKeys(vv))
}
}
if v := q.Get("max_cache_size"); v != "" {
vv, e := strconv.ParseInt(v, 10, 64)
if e != nil {
errs = multierror.Append(errs, errors.Wrapf(e, "max_cache_size query param %s", v))
} else {
opts = append(opts, MaxCacheSize(vv))
}
}
if v := q.Get("ttl"); v != "" {
vv, e := time.ParseDuration(v)
if e != nil {
errs = multierror.Append(errs, errors.Wrapf(e, "ttl query param %s", v))
} else {
opts = append(opts, TTL(vv))
}
}
return opts, errs.ErrorOrNil()
}
func redisOptionsFromURL(u *url.URL) (*redis.Options, error) {
query := u.Query()
db, err := strconv.Atoi(query.Get("db"))
if err != nil {
return nil, errors.Wrapf(err, "db from %s", u)
}
res := &redis.Options{
Addr: u.Hostname() + ":" + u.Port(),
DB: db,
Password: query.Get("password"),
Network: query.Get("network"),
}
if dialTimeout, err := time.ParseDuration(query.Get("dial_timeout")); err == nil {
res.DialTimeout = dialTimeout
}
if readTimeout, err := time.ParseDuration(query.Get("read_timeout")); err == nil {
res.ReadTimeout = readTimeout
}
if writeTimeout, err := time.ParseDuration(query.Get("write_timeout")); err == nil {
res.WriteTimeout = writeTimeout
}
return res, nil
}