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journal2clickhouse: coerce things that look like strings back to strings

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There's binary data sometimes, but on the whole I don't care about preserving
it properly (sorry), so let's just coerce it to a string if it is supposed to
go into a "proper" field.
This commit is contained in:
Luke Granger-Brown 2022-01-01 16:30:38 +00:00
parent 7e848a2622
commit 086f5fe597
1 changed files with 56 additions and 5 deletions
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61
go/journal2clickhouse/journal2clickhouse.go
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@ -185,11 +185,49 @@ func insertIntoClickhouse(ctx context.Context, chAddr string, rows []interface{}
return doInsert(ctx, chAddr, "logger.systemd_scrape", mostRecentRows)
}
func coerceToByteSlice(n []interface{}) ([]byte, bool) {
// Fast fail.
nInt, isInt := n[0].(int)
nFloat, isFloat := n[0].(float64)
_, isByte := n[0].(byte)
if !isInt && !isByte && !isFloat {
return nil, false
} else if isInt && (nInt >= 256 || nInt < 0) {
return nil, false
} else if isFloat && float64(byte(nFloat)) != nFloat {
return nil, false
}
out := make([]byte, len(n))
for idx, vInterface := range n {
vInt, okInt := vInterface.(int)
vByte, okByte := vInterface.(byte)
vFloat, okFloat := vInterface.(float64)
switch {
case okInt:
if vInt >= 256 || vInt < 0 {
return nil, false
}
out[idx] = byte(vInt)
case okByte:
out[idx] = vByte
case okFloat:
out[idx] = byte(vFloat)
if float64(out[idx]) != vFloat {
return nil, false
}
default:
return nil, false
}
}
return out, true
}
func parseLog(d map[string]interface{}) (map[string]interface{}, error) {
data := make(map[string]interface{})
extraData := make(map[string]interface{})
msgID := fmt.Sprintf("_HOSTNAME: %v; __REALTIME_TIMESTAMP: %v; MESSAGE: %v", data["_HOSTNAME"], data["__REALTIME_TIMESTAMP"], data["MESSAGE"])
msgID := fmt.Sprintf("_HOSTNAME: %v; __REALTIME_TIMESTAMP: %v; __CURSOR: %v; MESSAGE: %v", d["_HOSTNAME"], d["__REALTIME_TIMESTAMP"], d["__CURSOR"], d["MESSAGE"])
for origField, newField := range fieldMap {
v, ok := d[origField]
@ -199,10 +237,23 @@ func parseLog(d map[string]interface{}) (map[string]interface{}, error) {
// Check if this is a slice...
if vs, ok := v.([]interface{}); ok {
// extraData gets all values after the first one, we keep the first one.
log.Printf("[%v] origField %v newField %v got a repeated message; keeping only the first element", msgID, origField, newField)
extraData[origField] = vs[1:]
v = vs[0]
// This might be a []byte, though.
vbytes, ok := coerceToByteSlice(vs)
if ok {
v = string(vbytes)
} else {
// extraData gets all values after the first one, we keep the first one.
log.Printf("[%v] origField %v newField %v got a repeated message; keeping only the first element", msgID, origField, newField)
extraData[origField] = vs[1:]
v = vs[0]
}
}
if vs, ok := v.([]interface{}); ok {
// It's possible we had a [][]byte, so now coerce this again.
vbytes, ok := coerceToByteSlice(vs)
if ok {
v = string(vbytes)
}
}
transformer := fieldTransform[newField]