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Commit 7411ff1f authored by Alexander Alashkin's avatar Alexander Alashkin Committed by Cesanta Bot
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Drop load_balancer example 

PUBLISHED_FROM=d823db5e8b2831201e22bbdd3188e93bbbbbbb09
parent f2e7facb
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examples/Makefile
View file @ 7411ff1f
...@@ -6,7 +6,7 @@ SUBDIRS = $(sort $(dir $(wildcard ./*/))) ...@@ -6,7 +6,7 @@ SUBDIRS = $(sort $(dir $(wildcard ./*/)))
SUBDIRS:=$(filter-out ./ ./CC3200/ ./ESP8266_RTOS/ ./MSP432/ ./NXP_K64/ ./PIC32/ ./STM32F4_CC3100/ ./mbed/ ./nRF51/ ./nRF52/, $(SUBDIRS)) SUBDIRS:=$(filter-out ./ ./CC3200/ ./ESP8266_RTOS/ ./MSP432/ ./NXP_K64/ ./PIC32/ ./STM32F4_CC3100/ ./mbed/ ./nRF51/ ./nRF52/, $(SUBDIRS))
ifeq ($(OS), Windows_NT) ifeq ($(OS), Windows_NT)
SUBDIRS:=$(filter-out ./load_balancer/ ./netcat/ ./raspberry_pi_mjpeg_led/ ./captive_dns_server/, $(SUBDIRS)) SUBDIRS:=$(filter-out ./netcat/ ./raspberry_pi_mjpeg_led/ ./captive_dns_server/, $(SUBDIRS))
endif endif
.PHONY: $(SUBDIRS) .PHONY: $(SUBDIRS)
......
examples/load_balancer/Dockerfile deleted 100644 → 0
View file @ f2e7facb
FROM cesanta/mongoose
COPY load_balancer.c /mongoose/
WORKDIR /mongoose
RUN mkdir /mongoose/certs; \
sed -i 's:#include "../../mongoose.h":#include "mongoose.h":' load_balancer.c; \
cc load_balancer.c mongoose.c -o load_balancer -W -Wall -pthread -DMG_ENABLE_SSL -lssl -lcrypto
EXPOSE 8000
VOLUME ["/mongoose/certs"]
ENTRYPOINT ["/mongoose/load_balancer"]
examples/load_balancer/Makefile deleted 100644 → 0
View file @ f2e7facb
# To build with SSL under windows, do:
# wine make load_balancer.exe SSL=openssl # OpenSSL build
# wine make load_balancer.exe SSL=krypton # Krypton build
PROG = load_balancer
SOURCES = $(PROG).c ../../mongoose.c
CFLAGS = -W -Wall -pthread $(CFLAGS_EXTRA)
ifeq ($(SSL), openssl)
OPENSSL_PATH = ./openssl-0.9.8
CFLAGS_EXTRA += -DMG_ENABLE_SSL -I$(OPENSSL_PATH)/include
CFLAGS_EXTRA += /link /libpath:$(OPENSSL_PATH)/lib ssleay32.lib libeay32.lib
endif
ifeq ($(SSL), krypton)
KRYPTON_PATH = ../../../krypton
CFLAGS_EXTRA += -DMG_ENABLE_SSL $(KRYPTON_PATH)/krypton.c -I$(KRYPTON_PATH)
endif
all: $(PROG)
$(PROG): $(SOURCES)
$(CC) $(SOURCES) -o $@ $(CFLAGS)
$(PROG).exe: $(SOURCES)
cl $(SOURCES) /I.. /MD /Fe$@ /DMG_ENABLE_THREADS advapi32.lib $(CFLAGS_EXTRA)
test: $(PROG)
$(MAKE) -C ../api_server
sh unit_test.sh $$(pwd)/$(PROG)
docker-build:
docker build -t cesanta/load_balancer .
docker-push:
docker push cesanta/load_balancer
clean:
rm -rf *.gc* *.dSYM *.exe *.obj *.o a.out $(PROG)
examples/load_balancer/README.md deleted 100644 → 0
View file @ f2e7facb
# Mongoose-based HTTP load balancer
## Configuration
Load balancer is configured with command-line flags.
### Global flags
* `-p port` – TCP port to listen on. Default: 8000.
* `-l log_file` – path to the log file. Default: none.
* `-s ssl_cert` – path to SSL certificate. Default: none.
### Backend configuration
Main flag is `-b uri_prefix host_port` – it adds a new backend for a given
URI prefix. Example: `-b /stuff/ 127.0.0.1:8080` will route all requests that
start with '/stuff/' to a backend at port 8080 on localhost. There is a special
syntax for `uri_prefix` that allows you to change the URIs that get passed to
backends:
* `-b /stuff/=/ 127.0.0.1:8080` – for '/stuff/thing' backend will see '/thing'.
* `-b /stuff/=/other/ 127.0.0.1:8080` – '/stuff/thing' => '/other/thing'.
Also there are few per-backend flags that can be placed before `-b` and apply
only to the next backend:
* `-r` – instead of proxying requests load balancer will reply with 302
redirect.
* `-v vhost` – match not only URI prefix but 'Host:' header as well.
### Example
```
load_balancer -s path/to/cert.pem \
-v example.com -b /site/=/ 127.0.0.1:8080 \
-b /static/ 127.0.0.1:8081 \
-b /static/ 127.0.0.1:8082
```
In this example requests to 'example.com/site/' will be forwarded to the
backend on port 8080 with '/site' prefix stripped off and requests to
'/static/' on any virtual host will be balanced in round-robin fashion between
backends on ports 8081 and 8082.
examples/load_balancer/load_balancer.c deleted 100644 → 0
View file @ f2e7facb
/*
* Copyright (c) 2014 Cesanta Software Limited
* All rights reserved
*/
#include "../../mongoose.h"
#include <sys/queue.h>
#define MAX_IDLE_CONNS 5
#define CONN_IDLE_TIMEOUT 30
struct http_backend;
struct be_conn {
struct http_backend *be;
struct mg_connection *nc;
time_t idle_deadline;
STAILQ_ENTRY(be_conn) conns;
};
STAILQ_HEAD(be_conn_list_head, be_conn);
struct http_backend {
const char *vhost; /* NULL if any host */
const char *uri_prefix; /* URI prefix, e.g. "/api/v1/", "/static/" */
const char *uri_prefix_replacement; /* if not NULL, will replace uri_prefix in
requests to backends */
const char *host_port; /* Backend address */
int redirect; /* if true redirect instead of proxy */
int usage_counter; /* Number of times this backend was chosen */
struct be_conn_list_head conns;
int num_conns;
};
struct peer {
struct mg_connection *nc;
int64_t body_len; /* Size of the HTTP body to forward */
int64_t body_sent; /* Number of bytes already forwarded */
struct {
/* Headers have been sent, no more headers. */
unsigned int headers_sent : 1;
unsigned int keep_alive : 1;
} flags;
};
struct conn_data {
struct be_conn *be_conn; /* Chosen backend */
struct peer client; /* Client peer */
struct peer backend; /* Backend peer */
time_t last_activity;
};
static const char *s_error_500 = "HTTP/1.1 500 Failed\r\n";
static const char *s_content_len_0 = "Content-Length: 0\r\n";
static const char *s_connection_close = "Connection: close\r\n";
static const char *s_http_port = "8000";
static struct http_backend s_vhost_backends[100], s_default_backends[100];
static int s_num_vhost_backends = 0, s_num_default_backends = 0;
static int s_sig_num = 0;
static int s_backend_keepalive = 0;
static FILE *s_log_file = NULL;
#if MG_ENABLE_SSL
const char *s_ssl_cert = NULL;
#endif
static void ev_handler(struct mg_connection *nc, int ev, void *ev_data);
static void write_log(const char *fmt, ...);
static void signal_handler(int sig_num) {
signal(sig_num, signal_handler);
s_sig_num = sig_num;
}
static void send_http_err(struct mg_connection *nc, const char *err_line) {
mg_printf(nc, "%s%s%s\r\n", err_line, s_content_len_0, s_connection_close);
}
static void respond_with_error(struct conn_data *conn, const char *err_line) {
struct mg_connection *nc = conn->client.nc;
int headers_sent = conn->client.flags.headers_sent;
#ifdef DEBUG
write_log("conn=%p nc=%p respond_with_error %d\n", conn, nc, headers_sent);
#endif
if (nc == NULL) return;
if (!headers_sent) {
send_http_err(nc, err_line);
conn->client.flags.headers_sent = 1;
}
nc->flags |= MG_F_SEND_AND_CLOSE;
}
static int has_prefix(const struct mg_str *uri, const char *prefix) {
size_t prefix_len = strlen(prefix);
return uri->len >= prefix_len && memcmp(uri->p, prefix, prefix_len) == 0;
}
static int matches_vhost(const struct mg_str *host, const char *vhost) {
size_t vhost_len;
if (vhost == NULL) {
return 1;
}
vhost_len = strlen(vhost);
return host->len == vhost_len && memcmp(host->p, vhost, vhost_len) == 0;
}
static void write_log(const char *fmt, ...) {
va_list ap;
if (s_log_file != NULL) {
va_start(ap, fmt);
vfprintf(s_log_file, fmt, ap);
fflush(s_log_file);
va_end(ap);
}
}
static struct http_backend *choose_backend_from_list(
struct http_message *hm, struct http_backend *backends, int num_backends) {
int i;
struct mg_str vhost = {"", 0};
const struct mg_str *host = mg_get_http_header(hm, "host");
if (host != NULL) vhost = *host;
const char *vhost_end = vhost.p;
while (vhost_end < vhost.p + vhost.len && *vhost_end != ':') {
vhost_end++;
}
vhost.len = vhost_end - vhost.p;
struct http_backend *chosen = NULL;
for (i = 0; i < num_backends; i++) {
struct http_backend *be = &backends[i];
if (has_prefix(&hm->uri, be->uri_prefix) &&
matches_vhost(&vhost, be->vhost) &&
(chosen == NULL ||
/* Prefer most specific URI prefixes */
strlen(be->uri_prefix) > strlen(chosen->uri_prefix) ||
/* Among prefixes of the same length chose the least used. */
(strlen(be->uri_prefix) == strlen(chosen->uri_prefix) &&
be->usage_counter < chosen->usage_counter))) {
chosen = be;
}
}
return chosen;
}
static struct http_backend *choose_backend(struct http_message *hm) {
struct http_backend *chosen =
choose_backend_from_list(hm, s_vhost_backends, s_num_vhost_backends);
/* Nothing was chosen for this vhost, look for vhost == NULL backends. */
if (chosen == NULL) {
chosen = choose_backend_from_list(hm, s_default_backends,
s_num_default_backends);
}
if (chosen != NULL) chosen->usage_counter++;
return chosen;
}
static void forward_body(struct peer *src, struct peer *dst) {
struct mbuf *src_io = &src->nc->recv_mbuf;
if (src->body_sent < src->body_len) {
size_t to_send = src->body_len - src->body_sent;
if (src_io->len < to_send) {
to_send = src_io->len;
}
mg_send(dst->nc, src_io->buf, to_send);
src->body_sent += to_send;
mbuf_remove(src_io, to_send);
}
#ifdef DEBUG
write_log("forward_body %p (ka=%d) -> %p sent %d of %d\n", src->nc,
src->flags.keep_alive, dst->nc, src->body_sent, src->body_len);
#endif
}
static void forward(struct conn_data *conn, struct http_message *hm,
struct peer *src_peer, struct peer *dst_peer) {
struct mg_connection *src = src_peer->nc;
struct mg_connection *dst = dst_peer->nc;
struct mbuf *io = &src->recv_mbuf;
int i;
int is_request = (src_peer == &conn->client);
src_peer->body_len = hm->body.len;
struct http_backend *be = conn->be_conn->be;
if (is_request) {
/* Write rewritten request line. */
size_t trim_len = strlen(be->uri_prefix);
mg_printf(dst, "%.*s%s%.*s\r\n", (int) (hm->uri.p - io->buf), io->buf,
be->uri_prefix_replacement,
(int) (hm->proto.p + hm->proto.len - (hm->uri.p + trim_len)),
hm->uri.p + trim_len);
} else {
/* Reply line goes without modification */
mg_printf(dst, "%.*s %d %.*s\r\n", (int) hm->proto.len, hm->proto.p,
(int) hm->resp_code, (int) hm->resp_status_msg.len,
hm->resp_status_msg.p);
}
/* Headers. */
for (i = 0; i < MG_MAX_HTTP_HEADERS && hm->header_names[i].len > 0; i++) {
struct mg_str hn = hm->header_names[i];
struct mg_str hv = hm->header_values[i];
#if MG_ENABLE_SSL
/*
* If we terminate SSL and backend redirects to local HTTP port,
* strip protocol to let client use HTTPS.
* TODO(lsm): web page content may also contain local HTTP references,
* they need to be rewritten too.
*/
if (mg_vcasecmp(&hn, "Location") == 0 && s_ssl_cert != NULL) {
size_t hlen = strlen(be->host_port);
const char *hp = be->host_port, *p = memchr(hp, ':', hlen);
if (p == NULL) {
p = hp + hlen;
}
if (mg_ncasecmp(hv.p, "http://", 7) == 0 &&
mg_ncasecmp(hv.p + 7, hp, (p - hp)) == 0) {
mg_printf(dst, "Location: %.*s\r\n", (int) (hv.len - (7 + (p - hp))),
hv.p + 7 + (p - hp));
continue;
}
}
#endif
/* We always rewrite the connection header depending on the settings. */
if (mg_vcasecmp(&hn, "Connection") == 0) continue;
/* Don't pass chunked transfer encoding to the client */
if (mg_vcasecmp(&hn, "Transfer-encoding") == 0 &&
mg_vcasecmp(&hv, "chunked") == 0) {
continue;
}
mg_printf(dst, "%.*s: %.*s\r\n", (int) hn.len, hn.p, (int) hv.len, hv.p);
}
/* Emit the connection header. */
const char *connection_mode = "close";
if (dst_peer == &conn->backend) {
if (s_backend_keepalive) connection_mode = "keep-alive";
} else {
if (conn->client.flags.keep_alive) connection_mode = "keep-alive";
}
mg_printf(dst, "Connection: %s\r\n", connection_mode);
mg_printf(dst, "%s", "\r\n");
mbuf_remove(io, hm->body.p - hm->message.p); /* We've forwarded headers */
dst_peer->flags.headers_sent = 1;
forward_body(src_peer, dst_peer);
}
struct be_conn *get_conn(struct http_backend *be) {
if (STAILQ_EMPTY(&be->conns)) return NULL;
struct be_conn *result = STAILQ_FIRST(&be->conns);
STAILQ_REMOVE_HEAD(&be->conns, conns);
be->num_conns--;
return result;
}
/*
* choose_backend parses incoming HTTP request and routes it to the appropriate
* backend. It assumes that clients don't do HTTP pipelining, handling only
* one request request for each connection. To give a hint to backend about
* this it inserts "Connection: close" header into each forwarded request.
*/
static int connect_backend(struct conn_data *conn, struct http_message *hm) {
struct mg_connection *nc = conn->client.nc;
struct http_backend *be = choose_backend(hm);
write_log("%ld %.*s %.*s backend=%s\n", (long) time(NULL),
(int) hm->method.len, hm->method.p, (int) hm->uri.len, hm->uri.p,
be ? be->host_port : "not defined");
if (be == NULL) return 0;
if (be->redirect != 0) {
mg_printf(nc, "HTTP/1.1 302 Found\r\nLocation: %s\r\n\r\n", be->host_port);
return 1;
}
struct be_conn *bec = get_conn(be);
if (bec != NULL) {
bec->nc->handler = ev_handler;
#ifdef DEBUG
write_log("conn=%p to %p (%s) reusing bec=%p\n", conn, be, be->host_port,
bec);
#endif
} else {
bec = malloc(sizeof(*conn->be_conn));
memset(bec, 0, sizeof(*bec));
bec->nc = mg_connect(nc->mgr, be->host_port, ev_handler);
#ifdef DEBUG
write_log("conn=%p new conn to %p (%s) bec=%p\n", conn, be, be->host_port,
bec);
#endif
if (bec->nc == NULL) {
free(bec);
write_log("Connection to [%s] failed\n", be->host_port);
return 0;
}
}
bec->be = be;
conn->be_conn = bec;
conn->backend.nc = bec->nc;
conn->backend.nc->user_data = conn;
mg_set_protocol_http_websocket(conn->backend.nc);
return 1;
}
static int is_keep_alive(struct http_message *hm) {
const struct mg_str *connection_header = mg_get_http_header(hm, "Connection");
if (connection_header == NULL) {
/* HTTP/1.1 connections are keep-alive by default. */
if (mg_vcasecmp(&hm->proto, "HTTP/1.1") != 0) return 0;
} else if (mg_vcasecmp(connection_header, "keep-alive") != 0) {
return 0;
}
// We must also have Content-Length.
return mg_get_http_header(hm, "Content-Length") != NULL;
}
static void idle_backend_handler(struct mg_connection *nc, int ev,
void *ev_data) {
(void) ev_data; /* Unused. */
struct be_conn *bec = nc->user_data;
const time_t now = time(NULL);
#ifdef DEBUG
write_log("%d idle bec=%p nc=%p ev=%d deadline=%d\n", now, bec, nc, ev,
bec->idle_deadline);
#endif
switch (ev) {
case MG_EV_POLL: {
if (bec->idle_deadline > 0 && now > bec->idle_deadline) {
#ifdef DEBUG
write_log("bec=%p nc=%p closing due to idleness\n", bec, bec->nc);
#endif
bec->nc->flags |= MG_F_CLOSE_IMMEDIATELY;
}
break;
}
case MG_EV_CLOSE: {
#ifdef DEBUG
write_log("bec=%p closed\n", bec);
#endif
if (bec->idle_deadline > 0) {
STAILQ_REMOVE(&bec->be->conns, bec, be_conn, conns);
}
free(bec);
break;
}
}
}
void release_backend(struct conn_data *conn) {
/* Disassociate the backend, put back on the pool. */
struct be_conn *bec = conn->be_conn;
conn->be_conn = NULL;
if (bec->nc == NULL) {
free(bec);
memset(&conn->backend, 0, sizeof(conn->backend));
return;
}
struct http_backend *be = bec->be;
bec->nc->user_data = bec;
bec->nc->handler = idle_backend_handler;
if (conn->backend.flags.keep_alive) {
bec->idle_deadline = time(NULL) + CONN_IDLE_TIMEOUT;
STAILQ_INSERT_TAIL(&be->conns, bec, conns);
#ifdef DEBUG
write_log("bec=%p becoming idle\n", bec);
#endif
be->num_conns++;
while (be->num_conns > MAX_IDLE_CONNS) {
bec = STAILQ_FIRST(&be->conns);
STAILQ_REMOVE_HEAD(&be->conns, conns);
be->num_conns--;
bec->idle_deadline = 0;
bec->nc->flags = MG_F_CLOSE_IMMEDIATELY;
#ifdef DEBUG
write_log("bec=%p evicted\n", bec);
#endif
}
} else {
bec->idle_deadline = 0;
bec->nc->flags |= MG_F_CLOSE_IMMEDIATELY;
}
memset(&conn->backend, 0, sizeof(conn->backend));
}
static void ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
struct conn_data *conn = (struct conn_data *) nc->user_data;
const time_t now = time(NULL);
#ifdef DEBUG
write_log("%d conn=%p nc=%p ev=%d ev_data=%p bec=%p bec_nc=%p\n", now, conn,
nc, ev, ev_data, conn != NULL ? conn->be_conn : NULL,
conn != NULL && conn->be_conn != NULL ? conn->be_conn->nc : NULL);
#endif
if (conn == NULL) {
if (ev == MG_EV_ACCEPT) {
conn = calloc(1, sizeof(*conn));
if (conn == NULL) {
send_http_err(nc, s_error_500);
} else {
memset(conn, 0, sizeof(*conn));
nc->user_data = conn;
conn->client.nc = nc;
conn->client.body_len = -1;
conn->backend.body_len = -1;
conn->last_activity = now;
}
return;
} else {
if (ev != MG_EV_POLL) {
nc->flags |= MG_F_CLOSE_IMMEDIATELY;
}
return;
}
}
if (ev != MG_EV_POLL) conn->last_activity = now;
switch (ev) {
case MG_EV_HTTP_REQUEST: { /* From client */
assert(conn != NULL);
assert(conn->be_conn == NULL);
struct http_message *hm = (struct http_message *) ev_data;
conn->client.flags.keep_alive = is_keep_alive(hm);
if (!connect_backend(conn, hm)) {
respond_with_error(conn, s_error_500);
break;
}
if (conn->backend.nc == NULL) {
/* This is a redirect, we're done. */
conn->client.nc->flags |= MG_F_SEND_AND_CLOSE;
break;
}
forward(conn, hm, &conn->client, &conn->backend);
break;
}
case MG_EV_CONNECT: { /* To backend */
assert(conn != NULL);
assert(conn->be_conn != NULL);
int status = *(int *) ev_data;
if (status != 0) {
write_log("Error connecting to %s: %d (%s)\n",
conn->be_conn->be->host_port, status, strerror(status));
/* TODO(lsm): mark backend as defunct, try it later on */
respond_with_error(conn, s_error_500);
conn->be_conn->nc = NULL;
release_backend(conn);
break;
}
break;
}
case MG_EV_HTTP_REPLY: { /* From backend */
assert(conn != NULL);
struct http_message *hm = (struct http_message *) ev_data;
conn->backend.flags.keep_alive = s_backend_keepalive && is_keep_alive(hm);
forward(conn, hm, &conn->backend, &conn->client);
release_backend(conn);
if (!conn->client.flags.keep_alive) {
conn->client.nc->flags |= MG_F_SEND_AND_CLOSE;
} else {
#ifdef DEBUG
write_log("conn=%p remains open\n", conn);
#endif
}
break;
}
case MG_EV_POLL: {
assert(conn != NULL);
if (now - conn->last_activity > CONN_IDLE_TIMEOUT &&
conn->backend.nc == NULL /* not waiting for backend */) {
#ifdef DEBUG
write_log("conn=%p has been idle for too long\n", conn);
conn->client.nc->flags |= MG_F_SEND_AND_CLOSE;
#endif
}
break;
}
case MG_EV_CLOSE: {
assert(conn != NULL);
if (nc == conn->client.nc) {
#ifdef DEBUG
write_log("conn=%p nc=%p client closed, body_sent=%d\n", conn, nc,
conn->backend.body_sent);
#endif
conn->client.nc = NULL;
if (conn->backend.nc != NULL) {
conn->backend.nc->flags |= MG_F_CLOSE_IMMEDIATELY;
}
} else if (nc == conn->backend.nc) {
#ifdef DEBUG
write_log("conn=%p nc=%p backend closed\n", conn, nc);
#endif
conn->backend.nc = NULL;
if (conn->client.nc != NULL &&
(conn->backend.body_len < 0 ||
conn->backend.body_sent < conn->backend.body_len)) {
write_log("Backend %s disconnected.\n", conn->be_conn->be->host_port);
respond_with_error(conn, s_error_500);
}
}
if (conn->client.nc == NULL && conn->backend.nc == NULL) {
free(conn);
}
break;
}
}
}
static void print_usage_and_exit(const char *prog_name) {
fprintf(stderr,
"Usage: %s [-D debug_dump_file] [-p http_port] [-l log] [-k]"
#if MG_ENABLE_SSL
"[-s ssl_cert] "
#endif
"<[-r] [-v vhost] -b uri_prefix[=replacement] host_port> ... \n",
prog_name);
exit(EXIT_FAILURE);
}
int main(int argc, char *argv[]) {
struct mg_mgr mgr;
struct mg_connection *nc;
int i, redirect = 0;
const char *vhost = NULL;
mg_mgr_init(&mgr, NULL);
/* Parse command line arguments */
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-D") == 0) {
mgr.hexdump_file = argv[i + 1];
i++;
} else if (strcmp(argv[i], "-k") == 0) {
s_backend_keepalive = 1;
} else if (strcmp(argv[i], "-l") == 0 && i + 1 < argc) {
if (strcmp(argv[i + 1], "-") == 0) {
s_log_file = stdout;
} else {
s_log_file = fopen(argv[i + 1], "a");
if (s_log_file == NULL) {
perror("fopen");
exit(EXIT_FAILURE);
}
}
i++;
} else if (strcmp(argv[i], "-p") == 0) {
s_http_port = argv[i + 1];
i++;
} else if (strcmp(argv[i], "-r") == 0 && i + 1 < argc) {
redirect = 1;
} else if (strcmp(argv[i], "-v") == 0 && i + 1 < argc) {
if (strcmp(argv[i + 1], "") == 0) {
vhost = NULL;
} else {
vhost = argv[i + 1];
}
i++;
} else if (strcmp(argv[i], "-b") == 0 && i + 2 < argc) {
struct http_backend *be =
vhost != NULL ? &s_vhost_backends[s_num_vhost_backends++]
: &s_default_backends[s_num_default_backends++];
STAILQ_INIT(&be->conns);
char *r = NULL;
be->vhost = vhost;
be->uri_prefix = argv[i + 1];
be->host_port = argv[i + 2];
be->redirect = redirect;
be->uri_prefix_replacement = be->uri_prefix;
if ((r = strchr(be->uri_prefix, '=')) != NULL) {
*r = '\0';
be->uri_prefix_replacement = r + 1;
}
printf(
"Adding backend for %s%s : %s "
"[redirect=%d,prefix_replacement=%s]\n",
be->vhost == NULL ? "" : be->vhost, be->uri_prefix, be->host_port,
be->redirect, be->uri_prefix_replacement);
vhost = NULL;
redirect = 0;
i += 2;
#if MG_ENABLE_SSL
} else if (strcmp(argv[i], "-s") == 0 && i + 1 < argc) {
s_ssl_cert = argv[++i];
#endif
} else {
print_usage_and_exit(argv[0]);
}
}
/* Open listening socket */
if ((nc = mg_bind(&mgr, s_http_port, ev_handler)) == NULL) {
fprintf(stderr, "mg_bind(%s) failed\n", s_http_port);
exit(EXIT_FAILURE);
}
#if MG_ENABLE_SSL
if (s_ssl_cert != NULL) {
const char *err_str = mg_set_ssl(nc, s_ssl_cert, NULL);
if (err_str != NULL) {
fprintf(stderr, "Error loading SSL cert: %s\n", err_str);
exit(1);
}
}
#endif
mg_set_protocol_http_websocket(nc);
if (s_num_vhost_backends + s_num_default_backends == 0) {
print_usage_and_exit(argv[0]);
}
signal(SIGINT, signal_handler);
signal(SIGTERM, signal_handler);
/* Run event loop until signal is received */
printf("Starting LB on port %s\n", s_http_port);
while (s_sig_num == 0) {
mg_mgr_poll(&mgr, 1000);
}
/* Cleanup */
mg_mgr_free(&mgr);
printf("Exiting on signal %d\n", s_sig_num);
return EXIT_SUCCESS;
}
examples/load_balancer/unit_test.sh deleted 100644 → 0
View file @ f2e7facb
#!/bin/sh
PROG=$1
PORT=8002
cleanup() {
kill -9 $PID >/dev/null 2>&1
}
#set -x
trap cleanup EXIT
cleanup
$PROG -p $PORT -b /api/ 127.0.0.1:8000 &
PID=$!
# Perform api_server unit test through the load balancer by passing
# load balancer port to the unit test script
(cd ../api_server && make && sh unit_test.sh ./api_server $PORT)
exit $?
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