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JSON/XML/KV Helpers

JSON Helpers​

UnmarshalJSON(jsonBlob string, out map[string]interface{}, targetKey string)​

UnmarshalJSON allows to unmarshal a full json object into the out map, under the targetKey key.

In most situation, the evt.Unmarshaled field will be used to store the unmarshaled json object.

filter: |
  evt.Parsed.program == "my-program"
statics:
  - parsed: json_parsed
    expression: UnmarshalJSON(evt.Line.Raw, evt.Unmarshaled, "message")
  - meta: user
    expression: evt.Unmarshaled.message.user

JsonExtract(JsonBlob, FieldName) string​

Extract the FieldName from the JsonBlob and returns it as a string. (binding on jsonparser)

JsonExtract(evt.Parsed.some_json_blob, "foo.bar[0].one_item")

JsonExtractSlice(JsonBlob, FieldName) []interface{}​

Extract the JSON array in FieldName from JsonBlob and returns it as a go slice.

Returns nil if the field does not exist or is not an array.

JsonExtractSlice(evt.Parsed.message, "params")[0]['value']['login']

any(JsonExtractSlice(evt.Parsed.message, "params"), {.key == 'user' && .value.login != ''})

JsonExtractObject(JsonBlob, FieldName) map[string]interface{}​

Extract the JSON object in FieldName from JsonBlob and returns it as a go map.

Returns nil if the field does not exist or does is not an object.

JsonExtractObject(evt.Parsed.message, "params.user")["login"]

ToJsonString(Obj) string​

Returns the JSON representation of obj

Returns an empty string if obj cannot be serialized to JSON.

ToJsonString(JsonExtractSlice(evt.Parsed.message, "params"))

XML Helpers​

XMLGetAttributeValue(xmlString string, path string, attributeName string) string​

Returns the value of attribute in the XML node identified by the XPath query path.

XMLGetAttributeValue(evt.Line.Raw, "/Event/System[1]/Provider", "Name")

XMLGetNodeValue(xmlString string, path string) string​

Returns the content of the XML node identified by the XPath query path.

XMLGetNodeValue(evt.Line.Raw, "/Event/System[1]/EventID")

Key-Value Helpers​

ParseKV(kvString string, out map[string]interface{}, targetKey string)​

Parse a key-value string (such as key=value foo=bar fu="a string" ) into the out map, under the targetKey key.

In most situation, the evt.Unmarshaled field will be used to store the object.

filter: |
  evt.Parsed.program == "my-program"
statics:
  - parsed: kv_parsed
    expression: ParseKV(evt.Line.Raw, evt.Unmarshaled, "message")
  - meta: user
    expression: evt.Unmarshaled.message.user