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eventscript: use scripts array directly, rather than separate list

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We rename ctdb_monitor_script_status to ctdb_script, and instead of
allocating them as the scripts are executed, we allocate them up front
and keep a "current" interator.

This slightly simplifies the code, though it means we only marshall up
to the last successfully run script.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>


(This used to be ctdb commit b2a300768536d10bd867a987ad4cf1c5268c44bc)
This commit is contained in:
Rusty Russell 2009-12-08 12:45:17 +10:30
parent 23e24c503c
commit 9b50f7ee67
1 changed files with 48 additions and 50 deletions
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98
ctdb/server/eventscript.c
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@ -84,13 +84,11 @@ struct ctdb_event_script_state {
const char *options;
struct timeval timeout;
struct ctdb_monitor_script_status *scripts;
struct ctdb_script_list *script_list;
struct ctdb_script *scripts, *current;
};
struct ctdb_monitor_script_status {
struct ctdb_monitor_script_status *next;
struct ctdb_script {
struct ctdb_script *next;
const char *name;
struct timeval start;
struct timeval finished;
@ -103,8 +101,7 @@ struct ctdb_monitor_script_status {
*/
static void log_event_script_output(const char *str, uint16_t len, void *p)
{
struct ctdb_monitor_script_status *script =
talloc_get_type(p, struct ctdb_monitor_script_status);
struct ctdb_script *script = talloc_get_type(p, struct ctdb_script);
script->output = talloc_asprintf_append(script->output, "%*.*s", len, len, str);
}
@ -126,7 +123,7 @@ static int32_t ctdb_control_event_script_init(struct ctdb_context *ctdb)
/* starting a new child to run a monitor event script */
static int32_t ctdb_control_event_script_start(struct ctdb_context *ctdb, const char *name)
{
struct ctdb_monitor_script_status *script;
struct ctdb_script *script;
DEBUG(DEBUG_INFO, ("event script start called : %s\n", name));
@ -135,34 +132,27 @@ static int32_t ctdb_control_event_script_start(struct ctdb_context *ctdb, const
return -1;
}
script = talloc_zero(ctdb->current_monitor, struct ctdb_monitor_script_status);
script = ctdb->current_monitor->current;
if (script == NULL) {
DEBUG(DEBUG_ERR,(__location__ " Failed to talloc ctdb_monitor_script_status for script %s\n", name));
DEBUG(DEBUG_ERR,(__location__ " current script for monitor is NULL for %s\n", name));
return -1;
}
script->next = ctdb->current_monitor->scripts;
script->name = talloc_strdup(script, name);
CTDB_NO_MEMORY(ctdb, script->name);
script->output = talloc_strdup(script, "");
CTDB_NO_MEMORY(ctdb, script->output);
script->start = timeval_current();
ctdb->current_monitor->scripts = script;
return 0;
}
/* finished a child running a monitor event script */
static int32_t ctdb_control_event_script_stop(struct ctdb_context *ctdb, int res)
{
struct ctdb_monitor_script_status *script;
struct ctdb_script *script;
if (ctdb->current_monitor == NULL) {
DEBUG(DEBUG_ERR,(__location__ " current_monitor_status_ctx is NULL when script finished\n"));
return -1;
}
script = ctdb->current_monitor->scripts;
script = ctdb->current_monitor->current;
if (script == NULL) {
DEBUG(DEBUG_ERR,(__location__ " script is NULL when the script had finished\n"));
return -1;
@ -176,18 +166,14 @@ static int32_t ctdb_control_event_script_stop(struct ctdb_context *ctdb, int res
return 0;
}
static struct ctdb_monitoring_wire *marshall_monitoring_scripts(TALLOC_CTX *mem_ctx, struct ctdb_monitoring_wire *monitoring_scripts, struct ctdb_monitor_script_status *script)
static struct ctdb_monitoring_wire *marshall_monitoring_scripts(TALLOC_CTX *mem_ctx, struct ctdb_monitoring_wire *monitoring_scripts, struct ctdb_script *script, struct ctdb_script *terminus)
{
struct ctdb_monitoring_script_wire script_wire;
size_t size;
if (script == NULL) {
if (script == terminus) {
return monitoring_scripts;
}
monitoring_scripts = marshall_monitoring_scripts(mem_ctx, monitoring_scripts, script->next);
if (monitoring_scripts == NULL) {
return NULL;
}
bzero(&script_wire, sizeof(struct ctdb_monitoring_script_wire));
strncpy(script_wire.name, script->name, MAX_SCRIPT_NAME);
@ -208,12 +194,19 @@ static struct ctdb_monitoring_wire *marshall_monitoring_scripts(TALLOC_CTX *mem_
memcpy(&monitoring_scripts->scripts[monitoring_scripts->num_scripts], &script_wire, sizeof(script_wire));
monitoring_scripts->num_scripts++;
monitoring_scripts = marshall_monitoring_scripts(mem_ctx, monitoring_scripts, script->next, terminus);
if (monitoring_scripts == NULL) {
return NULL;
}
return monitoring_scripts;
}
/* called when all event script child processes are done */
static int32_t ctdb_control_event_script_finished(struct ctdb_context *ctdb)
{
struct ctdb_script *terminus = NULL;
DEBUG(DEBUG_INFO, ("event script finished called\n"));
if (ctdb->current_monitor == NULL) {
@ -228,8 +221,13 @@ static int32_t ctdb_control_event_script_finished(struct ctdb_context *ctdb)
return -1;
}
/* only report the finished ones */
if (ctdb->current_monitor->current != NULL) {
terminus = ctdb->current_monitor->current->next;
}
ctdb->last_status->num_scripts = 0;
ctdb->last_status = marshall_monitoring_scripts(ctdb, ctdb->last_status, ctdb->current_monitor->scripts);
ctdb->last_status = marshall_monitoring_scripts(ctdb, ctdb->last_status, ctdb->current_monitor->scripts, terminus);
talloc_free(ctdb->current_monitor->scripts);
ctdb->current_monitor->scripts = NULL;
@ -256,12 +254,6 @@ struct ctdb_script_tree_item {
int error;
};
struct ctdb_script_list {
struct ctdb_script_list *next;
const char *name;
int error;
};
/* Return true if OK, otherwise set errno. */
static bool check_executable(const char *dir, const char *name)
{
@ -290,13 +282,13 @@ static bool check_executable(const char *dir, const char *name)
return true;
}
static struct ctdb_script_list *ctdb_get_script_list(struct ctdb_context *ctdb, TALLOC_CTX *mem_ctx)
static struct ctdb_script *ctdb_get_script_list(struct ctdb_context *ctdb, TALLOC_CTX *mem_ctx)
{
DIR *dir;
struct dirent *de;
struct stat st;
trbt_tree_t *tree;
struct ctdb_script_list *head, *tail, *new_item;
struct ctdb_script *head, *tail, *new_item;
TALLOC_CTX *tmp_ctx = talloc_new(ctdb);
struct ctdb_script_tree_item *tree_item;
int count;
@ -381,7 +373,7 @@ static struct ctdb_script_list *ctdb_get_script_list(struct ctdb_context *ctdb,
*/
while ((tree_item=trbt_findfirstarray32(tree, 1)) != NULL) {
new_item = talloc(tmp_ctx, struct ctdb_script_list);
new_item = talloc(tmp_ctx, struct ctdb_script);
if (new_item == NULL) {
DEBUG(DEBUG_ERR, (__location__ " Failed to allocate new list item\n"));
talloc_free(tmp_ctx);
@ -390,7 +382,13 @@ static struct ctdb_script_list *ctdb_get_script_list(struct ctdb_context *ctdb,
new_item->next = NULL;
new_item->name = talloc_steal(new_item, tree_item->name);
new_item->error = tree_item->error;
new_item->status = -tree_item->error;
new_item->output = talloc_strdup(new_item, "");
if (new_item->output == NULL) {
DEBUG(DEBUG_ERR, (__location__ " Failed to allocate new list item output\n"));
talloc_free(tmp_ctx);
return NULL;
}
if (head == NULL) {
head = new_item;
@ -488,7 +486,7 @@ static int child_run_script(struct ctdb_context *ctdb,
bool from_user,
enum ctdb_eventscript_call call,
const char *options,
struct ctdb_script_list *current)
struct ctdb_script *current)
{
char *cmdstr;
int ret;
@ -506,8 +504,8 @@ static int child_run_script(struct ctdb_context *ctdb,
DEBUG(DEBUG_INFO,("Executing event script %s\n",cmdstr));
if (current->error) {
ret = -current->error;
if (current->status) {
ret = current->status;
goto out;
}
@ -528,10 +526,10 @@ static int fork_child_for_script(struct ctdb_context *ctdb,
void (*logfn)(const char *, uint16_t, void *) = NULL;
if (!state->from_user && state->call == CTDB_EVENT_MONITOR) {
ctdb_control_event_script_start(ctdb, state->script_list->name);
ctdb_control_event_script_start(ctdb, state->current->name);
/* We need the logging destroyed after scripts, since it
* refers to them. */
mem_ctx = state->scripts->output;
mem_ctx = state->current->output;
logfn = log_event_script_output;
}
@ -542,7 +540,7 @@ static int fork_child_for_script(struct ctdb_context *ctdb,
}
if (!ctdb_fork_with_logging(mem_ctx, ctdb, logfn,
state->scripts, &state->child)) {
state->current, &state->child)) {
r = -errno;
close(state->fd[0]);
close(state->fd[1]);
@ -556,7 +554,7 @@ static int fork_child_for_script(struct ctdb_context *ctdb,
close(state->fd[0]);
set_close_on_exec(state->fd[1]);
rt = child_run_script(ctdb, state->from_user, state->call, state->options, state->script_list);
rt = child_run_script(ctdb, state->from_user, state->call, state->options, state->current);
/* We must be able to write PIPEBUF bytes at least; if this
somehow fails, the read above will be short. */
write(state->fd[1], &rt, sizeof(rt));
@ -601,10 +599,9 @@ static void ctdb_event_script_handler(struct event_context *ev, struct fd_event
}
state->child = 0;
state->script_list = state->script_list->next;
/* Aborted or finished all scripts? We're done. */
if (state->cb_status != 0 || state->script_list == NULL) {
if (state->cb_status != 0 || state->current->next == NULL) {
DEBUG(DEBUG_INFO,(__location__ " Eventscript %s %s finished with state %d\n",
call_names[state->call], state->options, state->cb_status));
@ -620,6 +617,7 @@ static void ctdb_event_script_handler(struct event_context *ev, struct fd_event
talloc_free(fde);
/* Next script! */
state->current = state->current->next;
state->cb_status = fork_child_for_script(ctdb, state);
if (state->cb_status != 0) {
if (!state->from_user && state->call == CTDB_EVENT_MONITOR) {
@ -648,10 +646,10 @@ static void ctdb_event_script_timeout(struct event_context *ev, struct timed_eve
}
if (state->call == CTDB_EVENT_MONITOR || state->call == CTDB_EVENT_STATUS) {
struct ctdb_monitor_script_status *script;
struct ctdb_script *script;
if (ctdb->current_monitor != NULL) {
script = ctdb->current_monitor->scripts;
script = ctdb->current_monitor->current;
if (script != NULL) {
script->status = state->cb_status;
}
@ -791,9 +789,9 @@ static int ctdb_event_script_callback_v(struct ctdb_context *ctdb,
DEBUG(DEBUG_INFO,(__location__ " Starting eventscript %s %s\n",
call_names[state->call], state->options));
state->script_list = ctdb_get_script_list(ctdb, state);
if (state->script_list == NULL) {
state->current = state->scripts = ctdb_get_script_list(ctdb, state);
if (state->scripts == NULL) {
talloc_free(state);
return -1;
}