BUG/MINOR: contrib/prometheus-exporter: Don't use channel_htx_recv_max()

The function htx_free_data_space() must be used intead. Otherwise, if there are
some output data not already forwarded, the maximum amount of data that may be
inserted into the buffer may be greater than what we can really insert.

This patch must be backported to 2.0.

diff --git a/contrib/prometheus-exporter/service-prometheus.c b/contrib/prometheus-exporter/service-prometheus.c
index c55233727bef71b08a962520cf0bc1081fa46719..60de8b41867c80918c305d7a5a26b300215bfc06 100644 (file)
--- a/contrib/prometheus-exporter/service-prometheus.c
+++ b/contrib/prometheus-exporter/service-prometheus.c
@@ -1214,7 +1214,7 @@ static int promex_dump_global_metrics(struct appctx *appctx, struct htx *htx)
        struct field metric;
        struct channel *chn = si_ic(appctx->owner);
        struct ist out = ist2(trash.area, 0);
-       size_t max = channel_htx_recv_max(chn, htx);
+       size_t max = htx_free_data_space(htx);
        int ret = 1;
 
 #ifdef USE_OPENSSL
@@ -1427,7 +1427,7 @@ static int promex_dump_front_metrics(struct appctx *appctx, struct htx *htx)
        struct field metric;
        struct channel *chn = si_ic(appctx->owner);
        struct ist out = ist2(trash.area, 0);
-       size_t max = channel_htx_recv_max(chn, htx);
+       size_t max = htx_free_data_space(htx);
        int ret = 1;
 
        while (appctx->st2 && appctx->st2 < ST_F_TOTAL_FIELDS) {
@@ -1605,7 +1605,7 @@ static int promex_dump_back_metrics(struct appctx *appctx, struct htx *htx)
        struct field metric;
        struct channel *chn = si_ic(appctx->owner);
        struct ist out = ist2(trash.area, 0);
-       size_t max = channel_htx_recv_max(chn, htx);
+       size_t max = htx_free_data_space(htx);
        int ret = 1;
        uint32_t weight;
 
@@ -1824,7 +1824,7 @@ static int promex_dump_srv_metrics(struct appctx *appctx, struct htx *htx)
        struct field metric;
        struct channel *chn = si_ic(appctx->owner);
        struct ist out = ist2(trash.area, 0);
-       size_t max = channel_htx_recv_max(chn, htx);
+       size_t max = htx_free_data_space(htx);
        int ret = 1;
        uint32_t weight;