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start with New(uri) constructor for #6
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,13 +1,17 @@ | ||
| module github.com/go-pkgz/lcw | ||
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| require ( | ||
| github.com/alicebob/gopher-json v0.0.0-20180125190556-5a6b3ba71ee6 // indirect | ||
| github.com/alicebob/miniredis v2.5.0+incompatible | ||
| github.com/davecgh/go-spew v1.1.1 // indirect | ||
| github.com/go-redis/redis/v7 v7.0.0-beta.4 | ||
| github.com/gomodule/redigo v2.0.0+incompatible // indirect | ||
| github.com/hashicorp/go-multierror v1.0.0 | ||
| github.com/hashicorp/golang-lru v0.5.0 | ||
| github.com/patrickmn/go-cache v2.1.0+incompatible | ||
| github.com/pkg/errors v0.8.1 | ||
| github.com/stretchr/testify v1.3.0 | ||
| github.com/yuin/gopher-lua v0.0.0-20190514113301-1cd887cd7036 // indirect | ||
| ) | ||
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| go 1.13 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| package lcw | ||
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| import ( | ||
| "github.com/go-redis/redis/v7" | ||
| "github.com/hashicorp/go-multierror" | ||
| "github.com/pkg/errors" | ||
| "net/url" | ||
| "strconv" | ||
| "time" | ||
| ) | ||
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| // 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) | ||
| } | ||
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| query := u.Query() | ||
| opts, err := optionsFromQuery(query) | ||
| if err != nil { | ||
| return nil, errors.Wrapf(err, "parse uri options %s", uri) | ||
| } | ||
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| switch u.Scheme { | ||
| case "redis": | ||
| db, err := strconv.Atoi(query.Get("db")) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| client := redis.NewClient(&redis.Options{ | ||
| Addr: u.Host + ":" + u.Path, | ||
| DB: db, | ||
| //TODO: add minimal list os useful params for redis client | ||
| }) | ||
| res, err := NewRedisCache(client, 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) | ||
| } | ||
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| func optionsFromQuery(q url.Values) (opts []Option, err error) { | ||
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| errs := new(multierror.Error) | ||
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| if v := q.Get("max_val_size"); v != "" { | ||
| vv, e := strconv.Atoi(v) | ||
| if e != nil { | ||
| errs = multierror.Append(errs, errors.Wrapf(err, "max_val_size query param %s", v)) | ||
| } else { | ||
| opts = append(opts, MaxValSize(vv)) | ||
| } | ||
| } | ||
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| if v := q.Get("max_key_size"); v != "" { | ||
| vv, e := strconv.Atoi(v) | ||
| if e != nil { | ||
| errs = multierror.Append(errs, errors.Wrapf(err, "max_key_size query param %s", v)) | ||
| } else { | ||
| opts = append(opts, MaxKeySize(vv)) | ||
| } | ||
| } | ||
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| if v := q.Get("max_keys"); v != "" { | ||
| vv, e := strconv.Atoi(v) | ||
| if e != nil { | ||
| errs = multierror.Append(errs, errors.Wrapf(err, "max_keys query param %s", v)) | ||
| } else { | ||
| opts = append(opts, MaxKeys(vv)) | ||
| } | ||
| } | ||
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| if v := q.Get("max_cache_size"); v != "" { | ||
| vv, e := strconv.ParseInt(v, 10, 64) | ||
| if e != nil { | ||
| errs = multierror.Append(errs, errors.Wrapf(err, "max_cache_size query param %s", v)) | ||
| } else { | ||
| opts = append(opts, MaxCacheSize(vv)) | ||
| } | ||
| } | ||
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| if v := q.Get("ttl"); v != "" { | ||
| vv, e := time.ParseDuration(v) | ||
| if e != nil { | ||
| errs = multierror.Append(errs, errors.Wrapf(err, "ttl query param %s", v)) | ||
| } else { | ||
| opts = append(opts, TTL(vv)) | ||
| } | ||
| } | ||
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| return opts, errs.ErrorOrNil() | ||
| } |