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Stream: split_clients module.
This commit is contained in:
Vladimir Homutov
parent
bb790f5d30
commit
6c2b086d0e
10
auto/modules
10
auto/modules
@ -1054,6 +1054,16 @@ if [ $STREAM != NO ]; then
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. auto/module
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fi
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if [ $STREAM_SPLIT_CLIENTS = YES ]; then
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ngx_module_name=ngx_stream_split_clients_module
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ngx_module_deps=
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ngx_module_srcs=src/stream/ngx_stream_split_clients_module.c
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ngx_module_libs=
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ngx_module_link=$STREAM_SPLIT_CLIENTS
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. auto/module
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fi
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if [ $STREAM_RETURN = YES ]; then
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ngx_module_name=ngx_stream_return_module
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ngx_module_deps=
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@ -120,6 +120,7 @@ STREAM_ACCESS=YES
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STREAM_GEO=YES
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STREAM_GEOIP=NO
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STREAM_MAP=YES
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STREAM_SPLIT_CLIENTS=YES
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STREAM_RETURN=YES
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STREAM_UPSTREAM_HASH=YES
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STREAM_UPSTREAM_LEAST_CONN=YES
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@ -303,6 +304,8 @@ use the \"--with-mail_ssl_module\" option instead"
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--without-stream_access_module) STREAM_ACCESS=NO ;;
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--without-stream_geo_module) STREAM_GEO=NO ;;
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--without-stream_map_module) STREAM_MAP=NO ;;
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--without-stream_split_clients_module)
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STREAM_SPLIT_CLIENTS=NO ;;
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--without-stream_return_module) STREAM_RETURN=NO ;;
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--without-stream_upstream_hash_module)
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STREAM_UPSTREAM_HASH=NO ;;
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@ -506,6 +509,8 @@ cat << END
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--without-stream_access_module disable ngx_stream_access_module
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--without-stream_geo_module disable ngx_stream_geo_module
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--without-stream_map_module disable ngx_stream_map_module
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--without-stream_split_clients_module
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disable ngx_stream_split_clients_module
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--without-stream_return_module disable ngx_stream_return_module
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--without-stream_upstream_hash_module
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disable ngx_stream_upstream_hash_module
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244
src/stream/ngx_stream_split_clients_module.c
Normal file
244
src/stream/ngx_stream_split_clients_module.c
Normal file
@ -0,0 +1,244 @@
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/*
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* Copyright (C) Igor Sysoev
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* Copyright (C) Nginx, Inc.
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_stream.h>
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typedef struct {
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uint32_t percent;
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ngx_stream_variable_value_t value;
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} ngx_stream_split_clients_part_t;
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typedef struct {
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ngx_stream_complex_value_t value;
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ngx_array_t parts;
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} ngx_stream_split_clients_ctx_t;
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static char *ngx_conf_split_clients_block(ngx_conf_t *cf, ngx_command_t *cmd,
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void *conf);
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static char *ngx_stream_split_clients(ngx_conf_t *cf, ngx_command_t *dummy,
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void *conf);
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static ngx_command_t ngx_stream_split_clients_commands[] = {
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{ ngx_string("split_clients"),
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NGX_STREAM_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_TAKE2,
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ngx_conf_split_clients_block,
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NGX_STREAM_MAIN_CONF_OFFSET,
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0,
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NULL },
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ngx_null_command
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};
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static ngx_stream_module_t ngx_stream_split_clients_module_ctx = {
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NULL, /* preconfiguration */
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NULL, /* postconfiguration */
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NULL, /* create main configuration */
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NULL, /* init main configuration */
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NULL, /* create server configuration */
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NULL /* merge server configuration */
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};
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ngx_module_t ngx_stream_split_clients_module = {
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NGX_MODULE_V1,
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&ngx_stream_split_clients_module_ctx, /* module context */
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ngx_stream_split_clients_commands, /* module directives */
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NGX_STREAM_MODULE, /* module type */
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NULL, /* init master */
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NULL, /* init module */
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NULL, /* init process */
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NULL, /* init thread */
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NULL, /* exit thread */
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NULL, /* exit process */
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NULL, /* exit master */
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NGX_MODULE_V1_PADDING
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};
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static ngx_int_t
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ngx_stream_split_clients_variable(ngx_stream_session_t *s,
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ngx_stream_variable_value_t *v, uintptr_t data)
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{
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ngx_stream_split_clients_ctx_t *ctx =
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(ngx_stream_split_clients_ctx_t *) data;
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uint32_t hash;
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ngx_str_t val;
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ngx_uint_t i;
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ngx_stream_split_clients_part_t *part;
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*v = ngx_stream_variable_null_value;
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if (ngx_stream_complex_value(s, &ctx->value, &val) != NGX_OK) {
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return NGX_OK;
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}
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hash = ngx_murmur_hash2(val.data, val.len);
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part = ctx->parts.elts;
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for (i = 0; i < ctx->parts.nelts; i++) {
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ngx_log_debug2(NGX_LOG_DEBUG_STREAM, s->connection->log, 0,
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"stream split: %uD %uD", hash, part[i].percent);
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if (hash < part[i].percent || part[i].percent == 0) {
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*v = part[i].value;
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return NGX_OK;
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}
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}
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return NGX_OK;
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}
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static char *
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ngx_conf_split_clients_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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{
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char *rv;
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uint32_t sum, last;
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ngx_str_t *value, name;
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ngx_uint_t i;
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ngx_conf_t save;
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ngx_stream_variable_t *var;
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ngx_stream_split_clients_ctx_t *ctx;
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ngx_stream_split_clients_part_t *part;
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ngx_stream_compile_complex_value_t ccv;
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ctx = ngx_pcalloc(cf->pool, sizeof(ngx_stream_split_clients_ctx_t));
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if (ctx == NULL) {
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return NGX_CONF_ERROR;
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}
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value = cf->args->elts;
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ngx_memzero(&ccv, sizeof(ngx_stream_compile_complex_value_t));
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ccv.cf = cf;
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ccv.value = &value[1];
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ccv.complex_value = &ctx->value;
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if (ngx_stream_compile_complex_value(&ccv) != NGX_OK) {
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return NGX_CONF_ERROR;
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}
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name = value[2];
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if (name.data[0] != '$') {
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ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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"invalid variable name \"%V\"", &name);
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return NGX_CONF_ERROR;
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}
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name.len--;
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name.data++;
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var = ngx_stream_add_variable(cf, &name, NGX_STREAM_VAR_CHANGEABLE);
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if (var == NULL) {
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return NGX_CONF_ERROR;
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}
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var->get_handler = ngx_stream_split_clients_variable;
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var->data = (uintptr_t) ctx;
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if (ngx_array_init(&ctx->parts, cf->pool, 2,
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sizeof(ngx_stream_split_clients_part_t))
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!= NGX_OK)
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{
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return NGX_CONF_ERROR;
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}
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save = *cf;
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cf->ctx = ctx;
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cf->handler = ngx_stream_split_clients;
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cf->handler_conf = conf;
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rv = ngx_conf_parse(cf, NULL);
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*cf = save;
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if (rv != NGX_CONF_OK) {
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return rv;
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}
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sum = 0;
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last = 0;
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part = ctx->parts.elts;
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for (i = 0; i < ctx->parts.nelts; i++) {
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sum = part[i].percent ? sum + part[i].percent : 10000;
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if (sum > 10000) {
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ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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"percent total is greater than 100%%");
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return NGX_CONF_ERROR;
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}
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if (part[i].percent) {
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last += part[i].percent * (uint64_t) 0xffffffff / 10000;
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part[i].percent = last;
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}
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}
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return rv;
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}
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static char *
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ngx_stream_split_clients(ngx_conf_t *cf, ngx_command_t *dummy, void *conf)
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{
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ngx_int_t n;
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ngx_str_t *value;
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ngx_stream_split_clients_ctx_t *ctx;
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ngx_stream_split_clients_part_t *part;
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ctx = cf->ctx;
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value = cf->args->elts;
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part = ngx_array_push(&ctx->parts);
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if (part == NULL) {
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return NGX_CONF_ERROR;
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}
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if (value[0].len == 1 && value[0].data[0] == '*') {
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part->percent = 0;
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} else {
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if (value[0].len == 0 || value[0].data[value[0].len - 1] != '%') {
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goto invalid;
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}
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n = ngx_atofp(value[0].data, value[0].len - 1, 2);
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if (n == NGX_ERROR || n == 0) {
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goto invalid;
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}
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part->percent = (uint32_t) n;
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}
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part->value.len = value[1].len;
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part->value.valid = 1;
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part->value.no_cacheable = 0;
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part->value.not_found = 0;
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part->value.data = value[1].data;
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return NGX_CONF_OK;
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invalid:
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ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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"invalid percent value \"%V\"", &value[0]);
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return NGX_CONF_ERROR;
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}
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