[pve-devel] [PATCH manager v3] fix #3815: influxdb vmname should be string

[Markus Frank]

manager not container

On 1/28/22 11:03, Markus Frank wrote:
> InfluxDB interprets the vmname 66601 as a number and the vmname vm42 as a String.
> This leads to problematic metrics, that will be dropped by influxdb.
> Whichever comes first decides how the "schema" is defined.
>
> To change that I added a $to_quote hashmap to define which value
> shouldn't get interpreted as number.
> In this case the value of name.
>
> Change: Conversion happends in prepare_value.
>
> nodename and host are tags in InfluxDB so the only value they are able
> to contain are strings:
> https://docs.influxdata.com/influxdb/v2.1/reference/syntax/line-protocol/
>
> Signed-off-by: Markus Frank <m.frank at proxmox.com>
> ---
>   PVE/Status/InfluxDB.pm | 9 ++++++---
>   1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/PVE/Status/InfluxDB.pm b/PVE/Status/InfluxDB.pm
> index def7e2fd..63a865df 100644
> --- a/PVE/Status/InfluxDB.pm
> +++ b/PVE/Status/InfluxDB.pm
> @@ -276,6 +276,8 @@ sub test_connection {
>   sub build_influxdb_payload {
>       my ($class, $txn, $data, $ctime, $tags, $excluded, $measurement, $instance) = @_;
>   
> +    # 'abc' and '123' are both valid hostnames, that confuses influx's type detection
> +    my $to_quote = { name => 1 };
>       my @values = ();
>   
>       foreach my $key (sort keys %$data) {
> @@ -286,7 +288,7 @@ sub build_influxdb_payload {
>   	if (!ref($value) && $value ne '') {
>   	    # value is scalar
>   
> -	    if (defined(my $v = prepare_value($value))) {
> +	    if (defined(my $v = prepare_value($value, $to_quote->{$key}))) {
>   		push @values, "$key=$v";
>   	    }
>   	} elsif (ref($value) eq 'HASH') {
> @@ -331,9 +333,10 @@ sub get_recursive_values {
>   }
>   
>   sub prepare_value {
> -    my ($value) = @_;
> +    my ($value, $quote) = @_;
>   
> -    if (looks_like_number($value)) {
> +    # don't treat value like a number if quote is 1
> +    if (looks_like_number($value) && !$quote) {
>   	if (isnan($value) || isinf($value)) {
>   	    # we cannot send influxdb NaN or Inf
>   	    return undef;