Integrate TLDK with NGINX

Created a clone of nginx (from https://github.com/nginx/nginx)
to demonstrate and benchmark TLDK library integrated with real
world application.
A new nginx module is created and and BSD socket-like API is implemented
on top of native TLDK API.
Note, that right now only minimalistic subset of socket-like API is provided:
- accept
- close
- readv
- recv
- writev
so only limited nginx functionality is available for a moment.

Change-Id: Ie1efe9349a0538da4348a48fb8306cbf636b5a92
Signed-off-by: Mohammad Abdul Awal <mohammad.abdul.awal@intel.com>
Signed-off-by: Reshma Pattan <reshma.pattan@intel.com>
Signed-off-by: Remy Horton <remy.horton@intel.com>
Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>

1 files changed, 244 insertions, 0 deletions

diff --git a/app/nginx/src/stream/ngx_stream_split_clients_module.c b/app/nginx/src/stream/ngx_stream_split_clients_module.c
new file mode 100644
index 0000000..af6c8a1
--- /dev/null
+++ b/app/nginx/src/stream/ngx_stream_split_clients_module.c
@@ -0,0 +1,244 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ * Copyright (C) Nginx, Inc.
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_stream.h>
+
+
+typedef struct {
+    uint32_t                      percent;
+    ngx_stream_variable_value_t   value;
+} ngx_stream_split_clients_part_t;
+
+
+typedef struct {
+    ngx_stream_complex_value_t    value;
+    ngx_array_t                   parts;
+} ngx_stream_split_clients_ctx_t;
+
+
+static char *ngx_conf_split_clients_block(ngx_conf_t *cf, ngx_command_t *cmd,
+    void *conf);
+static char *ngx_stream_split_clients(ngx_conf_t *cf, ngx_command_t *dummy,
+    void *conf);
+
+static ngx_command_t  ngx_stream_split_clients_commands[] = {
+
+    { ngx_string("split_clients"),
+      NGX_STREAM_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_TAKE2,
+      ngx_conf_split_clients_block,
+      NGX_STREAM_MAIN_CONF_OFFSET,
+      0,
+      NULL },
+
+      ngx_null_command
+};
+
+
+static ngx_stream_module_t  ngx_stream_split_clients_module_ctx = {
+    NULL,                                  /* preconfiguration */
+    NULL,                                  /* postconfiguration */
+
+    NULL,                                  /* create main configuration */
+    NULL,                                  /* init main configuration */
+
+    NULL,                                  /* create server configuration */
+    NULL                                   /* merge server configuration */
+};
+
+
+ngx_module_t  ngx_stream_split_clients_module = {
+    NGX_MODULE_V1,
+    &ngx_stream_split_clients_module_ctx,  /* module context */
+    ngx_stream_split_clients_commands,     /* module directives */
+    NGX_STREAM_MODULE,                     /* module type */
+    NULL,                                  /* init master */
+    NULL,                                  /* init module */
+    NULL,                                  /* init process */
+    NULL,                                  /* init thread */
+    NULL,                                  /* exit thread */
+    NULL,                                  /* exit process */
+    NULL,                                  /* exit master */
+    NGX_MODULE_V1_PADDING
+};
+
+
+static ngx_int_t
+ngx_stream_split_clients_variable(ngx_stream_session_t *s,
+    ngx_stream_variable_value_t *v, uintptr_t data)
+{
+    ngx_stream_split_clients_ctx_t *ctx =
+                                       (ngx_stream_split_clients_ctx_t *) data;
+
+    uint32_t                          hash;
+    ngx_str_t                         val;
+    ngx_uint_t                        i;
+    ngx_stream_split_clients_part_t  *part;
+
+    *v = ngx_stream_variable_null_value;
+
+    if (ngx_stream_complex_value(s, &ctx->value, &val) != NGX_OK) {
+        return NGX_OK;
+    }
+
+    hash = ngx_murmur_hash2(val.data, val.len);
+
+    part = ctx->parts.elts;
+
+    for (i = 0; i < ctx->parts.nelts; i++) {
+
+        ngx_log_debug2(NGX_LOG_DEBUG_STREAM, s->connection->log, 0,
+                       "stream split: %uD %uD", hash, part[i].percent);
+
+        if (hash < part[i].percent || part[i].percent == 0) {
+            *v = part[i].value;
+            return NGX_OK;
+        }
+    }
+
+    return NGX_OK;
+}
+
+
+static char *
+ngx_conf_split_clients_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
+{
+    char                                *rv;
+    uint32_t                             sum, last;
+    ngx_str_t                           *value, name;
+    ngx_uint_t                           i;
+    ngx_conf_t                           save;
+    ngx_stream_variable_t               *var;
+    ngx_stream_split_clients_ctx_t      *ctx;
+    ngx_stream_split_clients_part_t     *part;
+    ngx_stream_compile_complex_value_t   ccv;
+
+    ctx = ngx_pcalloc(cf->pool, sizeof(ngx_stream_split_clients_ctx_t));
+    if (ctx == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    value = cf->args->elts;
+
+    ngx_memzero(&ccv, sizeof(ngx_stream_compile_complex_value_t));
+
+    ccv.cf = cf;
+    ccv.value = &value[1];
+    ccv.complex_value = &ctx->value;
+
+    if (ngx_stream_compile_complex_value(&ccv) != NGX_OK) {
+        return NGX_CONF_ERROR;
+    }
+
+    name = value[2];
+
+    if (name.data[0] != '$') {
+        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                           "invalid variable name \"%V\"", &name);
+        return NGX_CONF_ERROR;
+    }
+
+    name.len--;
+    name.data++;
+
+    var = ngx_stream_add_variable(cf, &name, NGX_STREAM_VAR_CHANGEABLE);
+    if (var == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    var->get_handler = ngx_stream_split_clients_variable;
+    var->data = (uintptr_t) ctx;
+
+    if (ngx_array_init(&ctx->parts, cf->pool, 2,
+                       sizeof(ngx_stream_split_clients_part_t))
+        != NGX_OK)
+    {
+        return NGX_CONF_ERROR;
+    }
+
+    save = *cf;
+    cf->ctx = ctx;
+    cf->handler = ngx_stream_split_clients;
+    cf->handler_conf = conf;
+
+    rv = ngx_conf_parse(cf, NULL);
+
+    *cf = save;
+
+    if (rv != NGX_CONF_OK) {
+        return rv;
+    }
+
+    sum = 0;
+    last = 0;
+    part = ctx->parts.elts;
+
+    for (i = 0; i < ctx->parts.nelts; i++) {
+        sum = part[i].percent ? sum + part[i].percent : 10000;
+        if (sum > 10000) {
+            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                               "percent total is greater than 100%%");
+            return NGX_CONF_ERROR;
+        }
+
+        if (part[i].percent) {
+            last += part[i].percent * (uint64_t) 0xffffffff / 10000;
+            part[i].percent = last;
+        }
+    }
+
+    return rv;
+}
+
+
+static char *
+ngx_stream_split_clients(ngx_conf_t *cf, ngx_command_t *dummy, void *conf)
+{
+    ngx_int_t                         n;
+    ngx_str_t                        *value;
+    ngx_stream_split_clients_ctx_t   *ctx;
+    ngx_stream_split_clients_part_t  *part;
+
+    ctx = cf->ctx;
+    value = cf->args->elts;
+
+    part = ngx_array_push(&ctx->parts);
+    if (part == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    if (value[0].len == 1 && value[0].data[0] == '*') {
+        part->percent = 0;
+
+    } else {
+        if (value[0].len == 0 || value[0].data[value[0].len - 1] != '%') {
+            goto invalid;
+        }
+
+        n = ngx_atofp(value[0].data, value[0].len - 1, 2);
+        if (n == NGX_ERROR || n == 0) {
+            goto invalid;
+        }
+
+        part->percent = (uint32_t) n;
+    }
+
+    part->value.len = value[1].len;
+    part->value.valid = 1;
+    part->value.no_cacheable = 0;
+    part->value.not_found = 0;
+    part->value.data = value[1].data;
+
+    return NGX_CONF_OK;
+
+invalid:
+
+    ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                       "invalid percent value \"%V\"", &value[0]);
+    return NGX_CONF_ERROR;
+}