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jsonhelper.go
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jsonhelper.go
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package jsontransform
import (
"fmt"
"time"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/logp"
)
func WriteJSONKeys(event common.MapStr, keys map[string]interface{}, overwriteKeys bool, errorKey string) {
for k, v := range keys {
if overwriteKeys {
if k == "@timestamp" {
vstr, ok := v.(string)
if !ok {
logp.Err("JSON: Won't overwrite @timestamp because value is not string")
event[errorKey] = "@timestamp not overwritten (not string)"
continue
}
// @timestamp must be of format RFC3339
ts, err := time.Parse(time.RFC3339, vstr)
if err != nil {
logp.Err("JSON: Won't overwrite @timestamp because of parsing error: %v", err)
event[errorKey] = fmt.Sprintf("@timestamp not overwritten (parse error on %s)", vstr)
continue
}
event[k] = common.Time(ts)
} else if k == "type" {
vstr, ok := v.(string)
if !ok {
logp.Err("JSON: Won't overwrite type because value is not string")
event[errorKey] = "type not overwritten (not string)"
continue
}
if len(vstr) == 0 || vstr[0] == '_' {
logp.Err("JSON: Won't overwrite type because value is empty or starts with an underscore")
event[errorKey] = fmt.Sprintf("type not overwritten (invalid value [%s])", vstr)
continue
}
event[k] = vstr
} else {
event[k] = v
}
} else if _, exists := event[k]; !exists {
event[k] = v
}
}
}