Quelle mod_logio.c Sprache: C

/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License.  You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

/*
* Written by Bojan Smojver <bojan rexursive.com>.
*/

#include "apr_strings.h"
#include "apr_lib.h"
#include "apr_hash.h"
#include "apr_optional.h"

#define APR_WANT_STRFUNC
#include "apr_want.h"

#include "ap_config.h"
#include "mod_log_config.h"
#include "httpd.h"
#include "http_core.h"
#include "http_config.h"
#include "http_connection.h"
#include "http_protocol.h"
#include "http_request.h"

module AP_MODULE_DECLARE_DATA logio_module;

static const char logio_filter_name[] = "LOG_INPUT_OUTPUT";
static const char logio_ttfb_filter_name[] = "LOGIO_TTFB_OUT";

/*
* Logging of input and output config...
*/

typedef struct logio_config_t {
    apr_off_t bytes_in;
    apr_off_t bytes_out;
    apr_off_t bytes_last_request;
} logio_config_t;

typedef struct logio_dirconf_t {
    unsigned int track_ttfb:1;
} logio_dirconf_t;

typedef struct logio_req_t {
    apr_time_t ttfb;
} logio_req_t;

/*
* Optional function for the core to add to bytes_out
*/

static void ap_logio_add_bytes_out(conn_rec *c, apr_off_t bytes)
{
    logio_config_t *cf = ap_get_module_config(c->conn_config, &logio_module);
    cf->bytes_out += bytes;
}

/*
* Optional function for modules to adjust bytes_in
*/

static void ap_logio_add_bytes_in(conn_rec *c, apr_off_t bytes)
{
    logio_config_t *cf = ap_get_module_config(c->conn_config, &logio_module);

    cf->bytes_in += bytes;
}

/*
* Optional function to get total byte count of last request for
* ap_increment_counts.
*/

static apr_off_t ap_logio_get_last_bytes(conn_rec *c)
{
    logio_config_t *cf = ap_get_module_config(c->conn_config, &logio_module);

    return cf->bytes_last_request;
}

/*
* Format items...
*/

static const char *log_bytes_in(request_rec *r, char *a)
{
    logio_config_t *cf = ap_get_module_config(r->connection->conn_config,
                                              &logio_module);

    return apr_off_t_toa(r->pool, cf->bytes_in);
}

static const char *log_bytes_out(request_rec *r, char *a)
{
    logio_config_t *cf = ap_get_module_config(r->connection->conn_config,
                                              &logio_module);

    return apr_off_t_toa(r->pool, cf->bytes_out);
}

static const char *log_bytes_combined(request_rec *r, char *a)
{
    logio_config_t *cf = ap_get_module_config(r->connection->conn_config,
                                              &logio_module);

    return apr_off_t_toa(r->pool, cf->bytes_out + cf->bytes_in);
}

static const char *log_ttfb(request_rec *r, char *a)
{
    logio_req_t *rconf = ap_get_module_config(r->request_config,
                                           &logio_module);

    if (!rconf || !rconf->ttfb) {
        return "-";
    }

    return apr_psprintf(r->pool, "%" APR_TIME_T_FMT, rconf->ttfb);
}
/*
* Reset counters after logging...
*/

static int logio_transaction(request_rec *r)
{
    logio_config_t *cf = ap_get_module_config(r->connection->conn_config,
                                              &logio_module);

    /* need to save byte count of last request for ap_increment_counts */
    cf->bytes_last_request = cf->bytes_in + cf->bytes_out;
    cf->bytes_in = cf->bytes_out = 0;

    return OK;
}

/*
* Logging of input filter...
*/

static apr_status_t logio_in_filter(ap_filter_t *f,
                                    apr_bucket_brigade *bb,
                                    ap_input_mode_t mode,
                                    apr_read_type_e block,
                                    apr_off_t readbytes)
{
    apr_off_t length;
    apr_status_t status;
    logio_config_t *cf = ap_get_module_config(f->c->conn_config, &logio_module);

    status = ap_get_brigade(f->next, bb, mode, block, readbytes);

    apr_brigade_length (bb, 0, &length);

    if (length > 0)
        cf->bytes_in += length;

    return status;
}

/*
* The hooks...
*/

static int logio_pre_conn(conn_rec *c, void *csd)
{
    logio_config_t *cf = apr_pcalloc(c->pool, sizeof(*cf));

    ap_set_module_config(c->conn_config, &logio_module, cf);

    ap_add_input_filter(logio_filter_name, NULL, NULL, c);

    return OK;
}

static int logio_pre_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp)
{
    APR_OPTIONAL_FN_TYPE(ap_register_log_handler) *log_pfn_register;

    log_pfn_register = APR_RETRIEVE_OPTIONAL_FN(ap_register_log_handler);

    if (log_pfn_register) {
        log_pfn_register(p, "I", log_bytes_in, 0);
        log_pfn_register(p, "O", log_bytes_out, 0);
        log_pfn_register(p, "S", log_bytes_combined, 0);
        log_pfn_register(p, "^FB", log_ttfb, 0);
    }

    return OK;
}

static apr_status_t logio_ttfb_filter(ap_filter_t *f, apr_bucket_brigade *b)
{
    request_rec *r = f->r;
    logio_dirconf_t *conf = ap_get_module_config(r->per_dir_config,
                                                 &logio_module);
    if (conf && conf->track_ttfb) {
        logio_req_t *rconf = ap_get_module_config(r->request_config,
                                                  &logio_module);
        if (rconf == NULL) {
            rconf = apr_pcalloc(r->pool, sizeof(logio_req_t));
            rconf->ttfb = apr_time_now() - r->request_time;
            ap_set_module_config(r->request_config, &logio_module, rconf);
        }
    }
    ap_remove_output_filter(f);
    return ap_pass_brigade(f->next, b);
}

static void logio_insert_filter(request_rec * r)
{
    logio_dirconf_t *conf = ap_get_module_config(r->per_dir_config,
                                                 &logio_module);
    if (conf->track_ttfb) {
        ap_add_output_filter(logio_ttfb_filter_name, NULL, r, r->connection);
    }
}

static const char *logio_track_ttfb(cmd_parms *cmd, void *in_dir_config, int arg)
{
    logio_dirconf_t *dir_config = in_dir_config;
    dir_config->track_ttfb = arg;
    return NULL;
}

static void *create_logio_dirconf (apr_pool_t *p, char *dummy)
{
    logio_dirconf_t *new =
        (logio_dirconf_t *) apr_pcalloc(p, sizeof(logio_dirconf_t));
    return (void *) new;
}

static const command_rec logio_cmds[] = {
    AP_INIT_FLAG ("LogIOTrackTTFB", logio_track_ttfb, NULL, OR_ALL,
                  "Set to 'ON' to enable tracking time to first byte"),
    {NULL}
};

static void register_hooks(apr_pool_t *p)
{
    static const char *pre[] = { "mod_log_config.c", NULL };

    ap_hook_pre_connection(logio_pre_conn, NULL, NULL, APR_HOOK_MIDDLE);
    ap_hook_pre_config(logio_pre_config, NULL, NULL, APR_HOOK_REALLY_FIRST);
    ap_hook_log_transaction(logio_transaction, pre, NULL, APR_HOOK_MIDDLE);

    ap_register_input_filter(logio_filter_name, logio_in_filter, NULL,
                             AP_FTYPE_NETWORK - 1);

    ap_hook_insert_filter(logio_insert_filter, NULL, NULL, APR_HOOK_LAST);
    ap_register_output_filter(logio_ttfb_filter_name, logio_ttfb_filter, NULL,
                              AP_FTYPE_RESOURCE);

    APR_REGISTER_OPTIONAL_FN(ap_logio_add_bytes_out);
    APR_REGISTER_OPTIONAL_FN(ap_logio_add_bytes_in);
    APR_REGISTER_OPTIONAL_FN(ap_logio_get_last_bytes);
}

AP_DECLARE_MODULE(logio) =
{
    STANDARD20_MODULE_STUFF,
    create_logio_dirconf,       /* create per-dir config */
    NULL,                       /* merge per-dir config */
    NULL,                       /* server config */
    NULL,                       /* merge server config */
    logio_cmds,                 /* command apr_table_t */
    register_hooks              /* register hooks */
};

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