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[core] calculate backend host gw_hash at startup 

- calculate backend host gw_hash at startup
- modify hash calculation at runtime to combine xor bits
  for hash value used in balancing selection
This commit is contained in:
Glenn Strauss 2021-06-09 02:14:52 -04:00
parent af3df29ae8
commit b33d779865
2 changed files with 6 additions and 14 deletions
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19
src/gw_backend.c
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@ -841,14 +841,9 @@ static gw_host * gw_host_get(request_st * const r, gw_extension *extension, int
base_hash = gw_hash(BUF_PTR_LEN(&r->uri.authority), base_hash);
for (k = 0, ndx = -1, last_max = UINT32_MAX; k < extension->used; ++k) {
uint32_t cur_max;
host = extension->hosts[k];
if (0 == host->active_procs) continue;
/* future: hash of host->host could be cached separately, mixed in*/
cur_max = host->host
? gw_hash(BUF_PTR_LEN(host->host), base_hash)
: base_hash;
const uint32_t cur_max = base_hash ^ host->gw_hash;
if (debug) {
log_error(r->conf.errh, __FILE__, __LINE__,
@ -930,16 +925,9 @@ static gw_host * gw_host_get(request_st * const r, gw_extension *extension, int
base_hash = gw_hash(BUF_PTR_LEN(dst_addr_buf), base_hash);
for (k = 0, ndx = -1, last_max = UINT32_MAX; k < extension->used; ++k) {
unsigned long cur_max;
host = extension->hosts[k];
if (0 == host->active_procs) continue;
/* future: hash of host->host could be cached separately, mixed in*/
cur_max = host->host
? gw_hash(BUF_PTR_LEN(host->host), base_hash)
: base_hash;
cur_max += host->port;
const uint32_t cur_max = base_hash ^ host->gw_hash ^ host->port;
if (debug) {
log_error(r->conf.errh, __FILE__, __LINE__,
@ -1712,6 +1700,9 @@ int gw_set_defaults_backend(server *srv, gw_plugin_data *p, const array *a, gw_p
if (0 != gw_proc_sockaddr_init(host, proc, srv->errh)) goto error;
}
const buffer * const h = host->host ? host->host : host->unixsocket;
host->gw_hash = gw_hash(BUF_PTR_LEN(h), DJBHASH_INIT);
/* s->exts is list of exts -> hosts
* s->exts now used as combined list
* of authorizer and responder hosts (for backend maintenance)

1
src/gw_backend.h
View File

@ -122,6 +122,7 @@ typedef struct {
const buffer *host;
unsigned short port;
unsigned short family; /* sa_family_t */
uint32_t gw_hash;
/*
* Unix Domain Socket