310 lines
8.0 KiB
C
310 lines
8.0 KiB
C
/*
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* mod_scgi - connect to SCGI backends for generating response content
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*
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* Author:
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* Copyright (c) 2013 Stefan Bühler
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*/
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#include <lighttpd/base.h>
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#include <lighttpd/plugin_core.h>
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#include <lighttpd/backends.h>
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#include <lighttpd/stream_http_response.h>
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LI_API gboolean mod_scgi_init(liModules *mods, liModule *mod);
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LI_API gboolean mod_scgi_free(liModules *mods, liModule *mod);
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typedef struct scgi_connection scgi_connection;
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typedef struct scgi_context scgi_context;
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struct scgi_context {
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gint refcount;
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liBackendPool *pool;
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GString *socket_str;
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};
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struct scgi_connection {
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scgi_context *ctx;
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liBackendConnection *bcon;
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gpointer simple_socket_data;
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};
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/**********************************************************************************/
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static gboolean append_key_value_pair(GByteArray *a, const gchar *key, size_t keylen, const gchar *val, size_t valuelen) {
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const guint8 z = 0;
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g_byte_array_append(a, (const guint8*) key, keylen);
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g_byte_array_append(a, &z, 1);
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g_byte_array_append(a, (const guint8*) val, valuelen);
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g_byte_array_append(a, &z, 1);
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return TRUE;
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}
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static void cgi_add_cb(gpointer param, const gchar *key, size_t keylen, const gchar *val, size_t valuelen) {
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GByteArray *a = (GByteArray*) param;
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append_key_value_pair(a, key, keylen, val, valuelen);
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}
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static void scgi_send_env(liVRequest *vr, liChunkQueue *out) {
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GByteArray *buf = g_byte_array_sized_new(0);
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liEnvironmentDup *envdup;
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GString *tmp = vr->wrk->tmp_str;
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GString *env_scgi_value;
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g_assert(vr->request.content_length >= 0);
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envdup = li_environment_make_dup(&vr->env);
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env_scgi_value = li_environment_dup_pop(envdup, CONST_STR_LEN("SCGI"));
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li_environment_dup2cgi(vr, envdup, cgi_add_cb, buf);
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if (NULL != env_scgi_value) {
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append_key_value_pair(buf, CONST_STR_LEN("SCGI"), GSTR_LEN(env_scgi_value));
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} else {
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append_key_value_pair(buf, CONST_STR_LEN("SCGI"), CONST_STR_LEN("1"));
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}
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g_string_printf(tmp, "%u:", buf->len);
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li_chunkqueue_append_mem(out, GSTR_LEN(tmp));
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{
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const guint8 c = ',';
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g_byte_array_append(buf, &c, 1);
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}
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li_chunkqueue_append_bytearr(out, buf);
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}
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/**********************************************************************************/
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static void scgi_backend_free(liBackendPool *bpool) {
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liBackendConfig *config = (liBackendConfig*) bpool->config;
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li_sockaddr_clear(&config->sock_addr);
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g_slice_free(liBackendConfig, config);
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}
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static liBackendCallbacks scgi_backend_cbs = {
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/* backend_detach_thread */ NULL,
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/* backend_attach_thread */ NULL,
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/* backend_new */ NULL,
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/* backend_close */ NULL,
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scgi_backend_free
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};
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static scgi_context* scgi_context_new(liServer *srv, GString *dest_socket) {
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liSocketAddress saddr;
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scgi_context* ctx;
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liBackendConfig *config;
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saddr = li_sockaddr_from_string(dest_socket, 0);
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if (NULL == saddr.addr) {
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ERROR(srv, "Invalid socket address '%s'", dest_socket->str);
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return NULL;
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}
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config = g_slice_new0(liBackendConfig);
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config->callbacks = &scgi_backend_cbs;
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config->sock_addr = saddr;
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config->max_connections = 0;
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config->idle_timeout = 5;
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config->connect_timeout = 5;
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config->wait_timeout = 5;
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config->disable_time = 0;
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config->max_requests = 1;
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config->watch_for_close = TRUE;
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ctx = g_slice_new0(scgi_context);
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ctx->refcount = 1;
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ctx->pool = li_backend_pool_new(config);
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ctx->socket_str = g_string_new_len(GSTR_LEN(dest_socket));
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return ctx;
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}
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static void scgi_context_release(scgi_context *ctx) {
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if (!ctx) return;
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LI_FORCE_ASSERT(g_atomic_int_get(&ctx->refcount) > 0);
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if (g_atomic_int_dec_and_test(&ctx->refcount)) {
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li_backend_pool_free(ctx->pool);
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g_string_free(ctx->socket_str, TRUE);
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g_slice_free(scgi_context, ctx);
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}
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}
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static void scgi_context_acquire(scgi_context *ctx) {
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LI_FORCE_ASSERT(g_atomic_int_get(&ctx->refcount) > 0);
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g_atomic_int_inc(&ctx->refcount);
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}
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static void scgi_io_cb(liIOStream *stream, liIOStreamEvent event) {
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scgi_connection *con = stream->data;
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liWorker *wrk = li_worker_from_iostream(stream);
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li_stream_simple_socket_io_cb_with_context(stream, event, &con->simple_socket_data);
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switch (event) {
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case LI_IOSTREAM_DESTROY:
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li_stream_simple_socket_close(stream, FALSE);
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li_event_io_set_fd(&con->bcon->watcher, -1);
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li_backend_put(wrk, con->ctx->pool, con->bcon, TRUE);
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con->bcon = NULL;
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scgi_context_release(con->ctx);
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g_slice_free(scgi_connection, con);
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stream->data = NULL;
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return;
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default:
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break;
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}
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if ((NULL == stream->stream_in.out || stream->stream_in.out->is_closed) &&
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!(NULL == stream->stream_out.out || stream->stream_out.out->is_closed)) {
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stream->stream_out.out->is_closed = TRUE;
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li_stream_again_later(&stream->stream_out);
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}
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}
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static void scgi_connection_new(liVRequest *vr, liBackendConnection *bcon, scgi_context *ctx) {
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scgi_connection* scon = g_slice_new0(scgi_connection);
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liIOStream *iostream;
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liStream *outplug;
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liStream *http_out;
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scgi_context_acquire(ctx);
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scon->ctx = ctx;
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scon->bcon = bcon;
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iostream = li_iostream_new(vr->wrk, li_event_io_fd(&bcon->watcher), scgi_io_cb, scon);
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/* insert scgi header before actual data */
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outplug = li_stream_plug_new(&vr->wrk->loop);
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li_stream_connect(outplug, &iostream->stream_out);
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scgi_send_env(vr, outplug->out);
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li_stream_notify_later(outplug);
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http_out = li_stream_http_response_handle(&iostream->stream_in, vr, TRUE, FALSE, FALSE);
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li_vrequest_handle_indirect(vr, NULL);
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li_vrequest_indirect_connect(vr, outplug, http_out);
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li_iostream_release(iostream);
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li_stream_release(outplug);
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li_stream_release(http_out);
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}
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/**********************************************************************************/
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static liHandlerResult scgi_handle_abort(liVRequest *vr, gpointer param, gpointer context) {
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scgi_context *ctx = (scgi_context*) param;
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liBackendWait *bwait = context;
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if (bwait != NULL) {
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li_backend_wait_stop(vr, ctx->pool, &bwait);
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}
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return LI_HANDLER_GO_ON;
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}
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static liHandlerResult scgi_handle(liVRequest *vr, gpointer param, gpointer *context) {
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liBackendWait *bwait = (liBackendWait*) *context;
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liBackendConnection *bcon = NULL;
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scgi_context *ctx = (scgi_context*) param;
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liBackendResult bres;
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if (li_vrequest_is_handled(vr)) return LI_HANDLER_GO_ON;
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LI_VREQUEST_WAIT_FOR_REQUEST_BODY(vr);
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if (vr->request.content_length < 0) {
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VR_ERROR(vr, "%s", "scgi can't handle progressive uploads. enable request body buffering!");
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return LI_HANDLER_ERROR;
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}
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bres = li_backend_get(vr, ctx->pool, &bcon, &bwait);
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*context = bwait;
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switch (bres) {
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case LI_BACKEND_SUCCESS:
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LI_FORCE_ASSERT(NULL == bwait);
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LI_FORCE_ASSERT(NULL != bcon);
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break;
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case LI_BACKEND_WAIT:
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LI_FORCE_ASSERT(NULL != bwait);
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return LI_HANDLER_WAIT_FOR_EVENT;
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case LI_BACKEND_TIMEOUT:
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li_vrequest_backend_dead(vr);
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return LI_HANDLER_GO_ON;
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}
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scgi_connection_new(vr, bcon, ctx);
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return LI_HANDLER_GO_ON;
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}
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static void scgi_free(liServer *srv, gpointer param) {
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scgi_context *ctx = (scgi_context*) param;
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UNUSED(srv);
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scgi_context_release(ctx);
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}
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static liAction* scgi_create(liServer *srv, liWorker *wrk, liPlugin* p, liValue *val, gpointer userdata) {
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scgi_context *ctx;
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UNUSED(wrk); UNUSED(userdata); UNUSED(p);
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val = li_value_get_single_argument(val);
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if (LI_VALUE_STRING != li_value_type(val)) {
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ERROR(srv, "%s", "scgi expects a string as parameter");
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return FALSE;
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}
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ctx = scgi_context_new(srv, val->data.string);
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if (NULL == ctx) return NULL;
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return li_action_new_function(scgi_handle, scgi_handle_abort, scgi_free, ctx);
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}
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static const liPluginOption options[] = {
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{ NULL, 0, 0, NULL }
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};
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static const liPluginAction actions[] = {
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{ "scgi", scgi_create, NULL },
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{ NULL, NULL, NULL }
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};
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static const liPluginSetup setups[] = {
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{ NULL, NULL, NULL }
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};
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static void plugin_init(liServer *srv, liPlugin *p, gpointer userdata) {
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UNUSED(srv); UNUSED(userdata);
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p->options = options;
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p->actions = actions;
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p->setups = setups;
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}
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gboolean mod_scgi_init(liModules *mods, liModule *mod) {
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MODULE_VERSION_CHECK(mods);
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mod->config = li_plugin_register(mods->main, "mod_scgi", plugin_init, NULL);
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return mod->config != NULL;
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}
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gboolean mod_scgi_free(liModules *mods, liModule *mod) {
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if (mod->config)
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li_plugin_free(mods->main, mod->config);
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return TRUE;
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}
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