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40 lines
791 B
Go
40 lines
791 B
Go
package hash
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import (
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"github.com/nalgeon/redka/internal/core"
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"github.com/nalgeon/redka/internal/redis"
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)
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// Returns the value of a field in a hash.
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// HGET key field
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// https://redis.io/commands/hget
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type HGet struct {
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redis.BaseCmd
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Key string
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Field string
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}
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func ParseHGet(b redis.BaseCmd) (*HGet, error) {
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cmd := &HGet{BaseCmd: b}
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if len(cmd.Args()) != 2 {
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return cmd, redis.ErrInvalidArgNum
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}
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cmd.Key = string(cmd.Args()[0])
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cmd.Field = string(cmd.Args()[1])
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return cmd, nil
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}
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func (cmd *HGet) Run(w redis.Writer, red redis.Redka) (any, error) {
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val, err := red.Hash().Get(cmd.Key, cmd.Field)
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if err == core.ErrNotFound {
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w.WriteNull()
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return val, nil
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}
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if err != nil {
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w.WriteError(cmd.Error(err))
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return nil, err
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}
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w.WriteBulk(val)
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return val, nil
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}
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