219 lines
7.0 KiB
C
219 lines
7.0 KiB
C
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/**
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* @file command_template.c
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <misc/debug.h>
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#include <ncd/modules/command_template.h>
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#define STATE_ADDING_LOCK 1
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#define STATE_ADDING 2
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#define STATE_ADDING_NEED_DELETE 3
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#define STATE_DONE 4
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#define STATE_DELETING_LOCK 5
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#define STATE_DELETING 6
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static void lock_handler (command_template_instance *o);
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static void process_handler (command_template_instance *o, int normally, uint8_t normally_exit_status);
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static void free_template (command_template_instance *o, int is_error);
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static void lock_handler (command_template_instance *o)
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{
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ASSERT(o->state == STATE_ADDING_LOCK || o->state == STATE_DELETING_LOCK)
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ASSERT(!(o->state == STATE_ADDING_LOCK) || o->do_exec)
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ASSERT(!(o->state == STATE_DELETING_LOCK) || o->undo_exec)
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if (o->state == STATE_ADDING_LOCK) {
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// start process
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if (!BProcess_Init(&o->process, o->i->params->iparams->manager, (BProcess_handler)process_handler, o, o->do_exec, CmdLine_Get(&o->do_cmdline), NULL)) {
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NCDModuleInst_Backend_Log(o->i, o->blog_channel, BLOG_ERROR, "BProcess_Init failed");
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free_template(o, 1);
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return;
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}
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// set state
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o->state = STATE_ADDING;
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} else {
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// start process
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if (!BProcess_Init(&o->process, o->i->params->iparams->manager, (BProcess_handler)process_handler, o, o->undo_exec, CmdLine_Get(&o->undo_cmdline), NULL)) {
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NCDModuleInst_Backend_Log(o->i, o->blog_channel, BLOG_ERROR, "BProcess_Init failed");
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free_template(o, 1);
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return;
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}
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// set state
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o->state = STATE_DELETING;
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}
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}
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static void process_handler (command_template_instance *o, int normally, uint8_t normally_exit_status)
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{
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ASSERT(o->state == STATE_ADDING || o->state == STATE_ADDING_NEED_DELETE || o->state == STATE_DELETING)
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// release lock
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BEventLockJob_Release(&o->elock_job);
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// free process
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BProcess_Free(&o->process);
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if (!normally || normally_exit_status != 0) {
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NCDModuleInst_Backend_Log(o->i, o->blog_channel, BLOG_ERROR, "command failed");
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free_template(o, 1);
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return;
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}
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switch (o->state) {
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case STATE_ADDING: {
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// set state
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o->state = STATE_DONE;
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// signal up
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NCDModuleInst_Backend_Up(o->i);
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} break;
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case STATE_ADDING_NEED_DELETE: {
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if (o->undo_exec) {
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// wait for lock
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BEventLockJob_Wait(&o->elock_job);
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// set state
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o->state = STATE_DELETING_LOCK;
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} else {
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free_template(o, 0);
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return;
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}
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} break;
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case STATE_DELETING: {
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// finish
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free_template(o, 0);
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return;
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} break;
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}
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}
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void command_template_new (command_template_instance *o, NCDModuleInst *i, const struct NCDModuleInst_new_params *params, command_template_build_cmdline build_cmdline, command_template_free_func free_func, void *user, int blog_channel, BEventLock *elock)
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{
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// init arguments
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o->i = i;
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o->free_func = free_func;
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o->user = user;
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o->blog_channel = blog_channel;
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// build do command
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if (!build_cmdline(o->i, params->args, 0, &o->do_exec, &o->do_cmdline)) {
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NCDModuleInst_Backend_Log(o->i, o->blog_channel, BLOG_ERROR, "build_cmdline do callback failed");
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goto fail0;
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}
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// build undo command
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if (!build_cmdline(o->i, params->args, 1, &o->undo_exec, &o->undo_cmdline)) {
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NCDModuleInst_Backend_Log(o->i, o->blog_channel, BLOG_ERROR, "build_cmdline undo callback failed");
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goto fail1;
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}
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// init lock job
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BEventLockJob_Init(&o->elock_job, elock, (BEventLock_handler)lock_handler, o);
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if (o->do_exec) {
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// wait for lock
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BEventLockJob_Wait(&o->elock_job);
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// set state
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o->state = STATE_ADDING_LOCK;
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} else {
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// set state
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o->state = STATE_DONE;
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// signal up
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NCDModuleInst_Backend_Up(o->i);
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}
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return;
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fail1:
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if (o->do_exec) {
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free(o->do_exec);
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CmdLine_Free(&o->do_cmdline);
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}
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fail0:
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o->free_func(o->user, 1);
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}
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static void free_template (command_template_instance *o, int is_error)
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{
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// free lock job
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BEventLockJob_Free(&o->elock_job);
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// free undo command
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if (o->undo_exec) {
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free(o->undo_exec);
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CmdLine_Free(&o->undo_cmdline);
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}
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// free do command
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if (o->do_exec) {
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free(o->do_exec);
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CmdLine_Free(&o->do_cmdline);
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}
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// call free function
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o->free_func(o->user, is_error);
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}
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void command_template_die (command_template_instance *o)
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{
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ASSERT(o->state == STATE_ADDING_LOCK || o->state == STATE_ADDING || o->state == STATE_DONE)
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switch (o->state) {
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case STATE_ADDING_LOCK: {
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free_template(o, 0);
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return;
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} break;
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case STATE_ADDING: {
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// set state
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o->state = STATE_ADDING_NEED_DELETE;
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} break;
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case STATE_DONE: {
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if (o->undo_exec) {
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// wait for lock
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BEventLockJob_Wait(&o->elock_job);
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// set state
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o->state = STATE_DELETING_LOCK;
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} else {
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free_template(o, 0);
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return;
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}
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} break;
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}
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}
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