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out_kinesis_firehose: add support for log_key #2619

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merged 2 commits into from
Oct 1, 2020
Merged

out_kinesis_firehose: add support for log_key #2619

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1ba18a4
out_kinesis_firehose: add support for log_key
PettitWesley Sep 30, 2020
73937aa
out_kinesis_firehose: Add offsetof to config map entries
PettitWesley Oct 1, 2020
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20 changes: 20 additions & 0 deletions plugins/out_kinesis_firehose/firehose.c
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Original file line number Diff line number Diff line change
Expand Up @@ -95,6 +95,16 @@ static int cb_firehose_init(struct flb_output_instance *ins,
ctx->time_key_format = DEFAULT_TIME_KEY_FORMAT;
}

tmp = flb_output_get_property("log_key", ins);
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this assignment is not necessary if the offsetof() is used in the configmap

if (tmp) {
ctx->log_key = tmp;
}

if (ctx->log_key && ctx->time_key) {
flb_plg_error(ctx->ins, "'time_key' and 'log_key' can not be used together");
goto error;
}

tmp = flb_output_get_property("endpoint", ins);
if (tmp) {
ctx->custom_endpoint = FLB_TRUE;
Expand Down Expand Up @@ -413,6 +423,16 @@ static struct flb_config_map config_map[] = {
"Custom endpoint for the STS API."
},

{
FLB_CONFIG_MAP_STR, "log_key", NULL,
0, FLB_FALSE, 0,
"By default, the whole log record will be sent to Firehose. "
"If you specify a key name with this option, then only the value of "
"that key will be sent to Firehose. For example, if you are using "
"the Fluentd Docker log driver, you can specify `log_key log` and only "
"the log message will be sent to Firehose."
},

/* EOF */
{0}
};
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11 changes: 11 additions & 0 deletions plugins/out_kinesis_firehose/firehose_api.c
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Original file line number Diff line number Diff line change
Expand Up @@ -183,6 +183,17 @@ static int process_event(struct flb_firehose *ctx, struct flush *buf,
return 2;
}

if (ctx->log_key) {
/*
* flb_msgpack_to_json will encase the value in quotes
* We don't want that for log_key, so we ignore the first
* and last character
*/
written -= 2;
tmp_buf_ptr++; /* pass over the opening quote */
buf->tmp_buf_offset++;
}

/* is (written + 1) because we still have to append newline */
if ((written + 1) >= MAX_EVENT_SIZE) {
flb_plg_warn(ctx->ins, "[size=%zu] Discarding record which is larger than "
Expand Down