Parser processor #4551
Parser processor #4551
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plugins/processors/parser/parser.go
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| // holds a default sample config | ||
| var SampleConfig = ` | ||
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| ## specify the name of the field[s] whose value will be parsed |
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Double space the sample config and remove the empty line on line 20.
plugins/processors/parser/parser.go
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| for _, metric := range metrics { | ||
| for _, key := range p.parseFields { | ||
| value := metric.Fields()[key] |
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It might not matter, but we could probably do if value, ok := metric.Fields()[key]; ok { here, to ensure there is a field value for the key.
Enhance tests Ensure useable by telegraf
plugins/processors/parser/parser.go
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| ) | ||
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| type Parser struct { | ||
| Config parsers.Config `toml:"config"` |
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Use an embedded field for the parsers.Config:
type Parser struct {
parsers.Config `toml:"config"`
This should make it so you can specify the options directly on the Parser object, similar to how it is set in input plugins:
[[processors.parser]]
parse_fields = ["message"]
original = "merge"
data_format = "json"
tag_keys = ["verb", "request"]
plugins/processors/parser/parser.go
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| } | ||
| sMetrics := []telegraf.Metric{} | ||
| for _, key := range p.ParseFields { | ||
| if value, ok := metric.Fields()[key]; ok { |
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Don't use .Fields() since it allocates a new map, (I really need to add a comment suggesting that it not be used). Instead use .FieldList(). You will probably want to reorder the loops since it think ParseFields should always be shorter than Fields.
plugins/processors/parser/parser.go
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| sMetrics := []telegraf.Metric{} | ||
| for _, key := range p.ParseFields { | ||
| if value, ok := metric.Fields()[key]; ok { | ||
| strVal := fmt.Sprintf("%v", value) |
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If it's not a string then log a warning and skip.
plugins/processors/parser/parser.go
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| log.Printf("E! [processors.parser] could not parse field %v: %v", key, err) | ||
| switch p.Original { | ||
| case "keep": | ||
| return metrics |
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This doesn't seem right... don't we need to parse all fields before we can return?
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Good catch, the tests missed this.
plugins/processors/parser/parser.go
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| case "keep": | ||
| return metrics | ||
| case "merge": | ||
| nMetrics = metrics |
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I'm all confused by the variable names: rMetric, sMetric, nMetric. Can you try to improve these? The Metric part is less interesting than the r, s, n parts, since we can easily lookup the type.
plugins/processors/parser/parser.go
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| } | ||
| sMetrics = append(sMetrics, nMetrics...) | ||
| } else { | ||
| fmt.Println("key not found", key) |
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I would probably ignore this situation to allow fields to be optional.
plugins/processors/parser/parser.go
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| } | ||
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| func (p Parser) setName(name string, metrics ...telegraf.Metric) []telegraf.Metric { | ||
| if len(metrics) == 0 { |
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Don't need this, if you remove it then it will just range over nothing and return metrics.
plugins/processors/parser/parser.go
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| return nil | ||
| } | ||
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| rMetric := metrics[0] |
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This seems like a problem if more than one metric is passed in to Apply. Secretly this never happens but the interface doesn't promise this.
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More than one metric does get passed into this function, it is intended for all the tags and fields to get merged down to the first metric
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More than one metric does get passed into this function, it is intended for all the tags and fields to get merged down to the first metric
danielnelson
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closes #4427