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kv.c
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kv.c
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// Copyright 2021 The NATS Authors
// Licensed 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.
#include <ctype.h>
#include "natsp.h"
#include "kv.h"
#include "mem.h"
#include "util.h"
#include "js.h"
static const char *kvBucketNameTmpl = "KV_%s";
static const char *kvSubjectsTmpl = "$KV.%s.>";
static const char *kvSubjectsPreTmpl = "$KV.%s.";
#define KV_WATCH_FOR_EVER (int64_t)(0x7FFFFFFFFFFFFFFF)
#define DEFINE_BUF_FOR_SUBJECT \
char buffer[128]; \
natsBuffer buf;
#define USE_JS_PREFIX true
#define KEY_NAME_ONLY false
#define BUILD_SUBJECT(p) \
s = natsBuf_InitWithBackend(&buf, buffer, 0, sizeof(buffer)); \
if ((p) && kv->useJSPrefix) \
{ \
IFOK(s, natsBuf_Append(&buf, kv->js->opts.Prefix, -1)); \
IFOK(s, natsBuf_AppendByte(&buf, '.')); \
} \
IFOK(s, natsBuf_Append(&buf, kv->pre, -1)); \
IFOK(s, natsBuf_Append(&buf, key, -1)); \
IFOK(s, natsBuf_AppendByte(&buf, 0));
#define KV_DEFINE_LIST \
kvEntry *e = NULL; \
kvEntry *h = NULL; \
kvEntry *t = NULL; \
int n = 0; \
int64_t timeout = KV_WATCH_FOR_EVER;\
int64_t start; \
int i;
#define KV_GATHER_LIST \
start = nats_Now(); \
while (s == NATS_OK) \
{ \
s = kvWatcher_Next(&e, w, timeout); \
if (s == NATS_OK) \
{ \
if (e == NULL) \
break; \
if (t != NULL) \
t->next = e; \
else \
h = e; \
t = e; \
n++; \
timeout -= (nats_Now() - start); \
if (timeout <= 0) \
s = nats_setDefaultError(NATS_TIMEOUT); \
} \
}
//////////////////////////////////////////////////////////////////////////////
// kvStore management APIs
//////////////////////////////////////////////////////////////////////////////
natsStatus
kvConfig_Init(kvConfig *cfg)
{
if (cfg == NULL)
return nats_setDefaultError(NATS_INVALID_ARG);
memset(cfg, 0, sizeof(kvConfig));
return NATS_OK;
}
static bool
validBucketName(const char *bucket)
{
int i;
char c;
if (nats_IsStringEmpty(bucket))
return false;
for (i=0; i<(int)strlen(bucket); i++)
{
c = bucket[i];
if ((isalnum(c) == 0) && (c != '_') && (c != '-'))
return false;
}
return true;
}
static void
_freeKV(kvStore *kv)
{
jsCtx *js = NULL;
if (kv == NULL)
return;
js = kv->js;
NATS_FREE(kv->bucket);
NATS_FREE(kv->stream);
NATS_FREE(kv->pre);
natsMutex_Destroy(kv->mu);
NATS_FREE(kv);
js_release(js);
}
static void
_retainKV(kvStore *kv)
{
natsMutex_Lock(kv->mu);
kv->refs++;
natsMutex_Unlock(kv->mu);
}
static void
_releaseKV(kvStore *kv)
{
bool doFree;
if (kv == NULL)
return;
natsMutex_Lock(kv->mu);
doFree = (--(kv->refs) == 0);
natsMutex_Unlock(kv->mu);
if (doFree)
_freeKV(kv);
}
void
kvStore_Destroy(kvStore *kv)
{
_releaseKV(kv);
}
static natsStatus
_createKV(kvStore **new_kv, jsCtx *js, const char *bucket)
{
natsStatus s = NATS_OK;
kvStore *kv = NULL;
if (!validBucketName(bucket))
return nats_setError(NATS_INVALID_ARG, "%s", kvErrInvalidBucketName);
kv = (kvStore*) NATS_CALLOC(1, sizeof(kvStore));
if (kv == NULL)
return nats_setDefaultError(NATS_NO_MEMORY);
kv->refs = 1;
s = natsMutex_Create(&(kv->mu));
IF_OK_DUP_STRING(s, kv->bucket, bucket);
if ((s == NATS_OK) && (nats_asprintf(&(kv->stream), kvBucketNameTmpl, bucket) < 0))
s = nats_setDefaultError(NATS_NO_MEMORY);
if ((s == NATS_OK) && (nats_asprintf(&(kv->pre), kvSubjectsPreTmpl, bucket) < 0))
s = nats_setDefaultError(NATS_NO_MEMORY);
if (s == NATS_OK)
{
kv->useJSPrefix = (strcmp(js->opts.Prefix, jsDefaultAPIPrefix) != 0 ? true : false);
kv->js = js;
js_retain(js);
*new_kv = kv;
}
else
_freeKV(kv);
return NATS_UPDATE_ERR_STACK(s);
}
natsStatus
js_CreateKeyValue(kvStore **new_kv, jsCtx *js, kvConfig *cfg)
{
natsStatus s;
int64_t history = 1;
int64_t replicas= 1;
kvStore *kv = NULL;
char *subject= NULL;
jsStreamConfig sc;
if ((new_kv == NULL) || (js == NULL) || (cfg == NULL))
return nats_setDefaultError(NATS_INVALID_ARG);
s = _createKV(&kv, js, cfg->Bucket);
if (s != NATS_OK)
return NATS_UPDATE_ERR_STACK(s);
if (cfg->History > 0)
{
if (cfg->History > kvMaxHistory)
s = nats_setError(NATS_INVALID_ARG, "%s %d", kvErrHistoryTooLarge, kvMaxHistory);
else
history = (int64_t) cfg->History;
}
if (s == NATS_OK)
{
if (cfg->Replicas > 0)
replicas = cfg->Replicas;
if (nats_asprintf(&subject, kvSubjectsTmpl, kv->bucket) < 0)
s = nats_setDefaultError(NATS_NO_MEMORY);
}
if (s == NATS_OK)
{
jsStreamConfig_Init(&sc);
sc.Name = kv->stream;
sc.Description = cfg->Description;
sc.Subjects = (const char*[1]){subject};
sc.SubjectsLen = 1;
sc.MaxMsgsPerSubject = history;
sc.MaxBytes = cfg->MaxBytes;
sc.MaxAge = cfg->TTL;
sc.MaxMsgSize = cfg->MaxValueSize;
sc.Storage = cfg->StorageType;
sc.Replicas = replicas;
sc.AllowRollup = true;
sc.DenyDelete = true;
s = js_AddStream(NULL, js, &sc, NULL, NULL);
}
if (s == NATS_OK)
*new_kv = kv;
else
_freeKV(kv);
NATS_FREE(subject);
return NATS_UPDATE_ERR_STACK(s);
}
natsStatus
js_KeyValue(kvStore **new_kv, jsCtx *js, const char *bucket)
{
natsStatus s;
kvStore *kv = NULL;
jsStreamInfo *si = NULL;
if ((new_kv == NULL) || (js == NULL))
return nats_setDefaultError(NATS_INVALID_ARG);
s = _createKV(&kv, js, bucket);
if (s != NATS_OK)
return NATS_UPDATE_ERR_STACK(s);
s = js_GetStreamInfo(&si, js, kv->stream, NULL, NULL);
if (s == NATS_OK)
{
// Do some quick sanity checks that this is a correctly formed stream for KV.
// Max msgs per subject should be > 0.
if (si->Config->MaxMsgsPerSubject < 1)
s = nats_setError(NATS_INVALID_ARG, "%s", kvErrBadBucket);
jsStreamInfo_Destroy(si);
}
if (s == NATS_OK)
*new_kv = kv;
else
{
_freeKV(kv);
if (s == NATS_NOT_FOUND)
return s;
}
return NATS_UPDATE_ERR_STACK(s);
}
natsStatus
js_DeleteKeyValue(jsCtx *js, const char *bucket)
{
natsStatus s;
char *stream = NULL;
if (js == NULL)
return nats_setDefaultError(NATS_INVALID_ARG);
if (!validBucketName(bucket))
return nats_setError(NATS_INVALID_ARG, "%s", kvErrBadBucket);
if (nats_asprintf(&stream, kvBucketNameTmpl, bucket) < 0)
return nats_setDefaultError(NATS_NO_MEMORY);
s = js_DeleteStream(js, (const char*) stream, NULL, NULL);
NATS_FREE(stream);
return NATS_UPDATE_ERR_STACK(s);
}
//////////////////////////////////////////////////////////////////////////////
// kvStore APIs
//////////////////////////////////////////////////////////////////////////////
static bool
validKey(const char *key)
{
int i;
char c;
int last;
if (nats_IsStringEmpty(key))
return false;
last = (int) strlen(key);
for (i=0; i<last; i++)
{
c = key[i];
if ((c == '.') && ((i == 0) || (i == last-1) || (key[i-1] == '.')))
{
return false;
}
else if ((isalnum(c) == 0) && (c != '.') && (c != '_') && (c != '-')
&& (c != '/') && (c != '\\') && (c != '='))
{
return false;
}
}
return true;
}
static natsStatus
_createEntry(kvEntry **new_entry, kvStore *kv, natsMsg **msg)
{
kvEntry *e = NULL;
const char *val = NULL;
e = (kvEntry*) NATS_CALLOC(1, sizeof(kvEntry));
if (e == NULL)
return nats_setDefaultError(NATS_NO_MEMORY);
_retainKV(kv);
e->kv = kv;
e->msg = *msg;
e->key = e->msg->subject+(int)strlen(kv->pre);
if (natsMsgHeader_Get(e->msg, kvOpHeader, &val) == NATS_OK)
{
if (strcmp(val, kvOpDeleteStr) == 0)
e->op = kvOp_Delete;
else if (strcmp(val, kvOpPurgeStr) == 0)
e->op = kvOp_Purge;
}
// Indicate that we took ownership of the message
*msg = NULL;
*new_entry = e;
return NATS_OK;
}
static natsStatus
_getEntry(kvEntry **new_entry, bool *deleted, kvStore *kv, const char *key)
{
natsStatus s = NATS_OK;
natsMsg *msg = NULL;
kvEntry *e = NULL;
DEFINE_BUF_FOR_SUBJECT;
*new_entry = NULL;
*deleted = false;
if (!validKey(key))
return nats_setError(NATS_INVALID_ARG, "%s", kvErrInvalidKey);
BUILD_SUBJECT(KEY_NAME_ONLY);
IFOK(s, js_GetLastMsg(&msg, kv->js, kv->stream, natsBuf_Data(&buf), NULL, NULL));
IFOK(s, _createEntry(&e, kv, &msg));
natsBuf_Cleanup(&buf);
natsMsg_Destroy(msg);
if (s == NATS_OK)
{
if ((e->op == kvOp_Delete) || (e->op == kvOp_Purge))
*deleted = true;
*new_entry = e;
}
else
{
kvEntry_Destroy(e);
if (s == NATS_NOT_FOUND)
{
nats_clearLastError();
return s;
}
}
return NATS_UPDATE_ERR_STACK(s);
}
natsStatus
kvStore_Get(kvEntry **new_entry, kvStore *kv, const char *key)
{
natsStatus s;
bool deleted = false;
if ((new_entry == NULL) || (kv == NULL))
return nats_setDefaultError(NATS_INVALID_ARG);
s = _getEntry(new_entry, &deleted, kv, key);
if (s == NATS_OK)
{
if (deleted)
{
kvEntry_Destroy(*new_entry);
*new_entry = NULL;
return NATS_NOT_FOUND;
}
}
else if (s == NATS_NOT_FOUND)
return s;
return NATS_UPDATE_ERR_STACK(s);
}
static natsStatus
_putEntry(uint64_t *rev, kvStore *kv, jsPubOptions *po, const char *key, const void *data, int len)
{
natsStatus s = NATS_OK;
jsPubAck *pa = NULL;
jsPubAck **ppa = NULL;
DEFINE_BUF_FOR_SUBJECT;
if (rev != NULL)
{
*rev = 0;
ppa = &pa;
}
if (kv == NULL)
return nats_setDefaultError(NATS_INVALID_ARG);
if (!validKey(key))
return nats_setError(NATS_INVALID_ARG, "%s", kvErrInvalidKey);
BUILD_SUBJECT(USE_JS_PREFIX);
IFOK(s, js_Publish(ppa, kv->js, natsBuf_Data(&buf), data, len, po, NULL));
if ((s == NATS_OK) && (rev != NULL))
*rev = pa->Sequence;
natsBuf_Cleanup(&buf);
jsPubAck_Destroy(pa);
return NATS_UPDATE_ERR_STACK(s);
}
natsStatus
kvStore_Put(uint64_t *rev, kvStore *kv, const char *key, const void *data, int len)
{
natsStatus s;
s = _putEntry(rev, kv, NULL, key, data, len);
return NATS_UPDATE_ERR_STACK(s);
}
natsStatus
kvStore_PutString(uint64_t *rev, kvStore *kv, const char *key, const char *data)
{
natsStatus s;
int l = (data == NULL ? 0 : (int) strlen(data));
s = kvStore_Put(rev, kv, key, (const void*) data, l);
return NATS_UPDATE_ERR_STACK(s);
}
natsStatus
kvStore_Create(uint64_t *rev, kvStore *kv, const char *key, const void *data, int len)
{
natsStatus s;
natsStatus ls;
kvEntry *e = NULL;
bool deleted = false;
if (kv == NULL)
return nats_setDefaultError(NATS_INVALID_ARG);
s = kvStore_Update(rev, kv, key, data, len, 0);
if (s == NATS_OK)
return s;
// Since we have tombstones for DEL ops for watchers, this could be from that
// so we need to double check.
ls = _getEntry(&e, &deleted, kv, key);
if (ls == NATS_OK)
{
if (deleted)
s = kvStore_Update(rev, kv, key, data, len, kvEntry_Revision(e));
kvEntry_Destroy(e);
}
return NATS_UPDATE_ERR_STACK(s);
}
natsStatus
kvStore_CreateString(uint64_t *rev, kvStore *kv, const char *key, const char *data)
{
natsStatus s = kvStore_Create(rev, kv, key, (const void*) data, (int) strlen(data));
return NATS_UPDATE_ERR_STACK(s);
}
natsStatus
kvStore_Update(uint64_t *rev, kvStore *kv, const char *key, const void *data, int len, uint64_t last)
{
natsStatus s;
jsPubOptions po;
jsPubOptions_Init(&po);
if (last == 0)
po.ExpectNoMessage = true;
else
po.ExpectLastSubjectSeq = last;
s = _putEntry(rev, kv, &po, key, data, len);
return NATS_UPDATE_ERR_STACK(s);
}
natsStatus
kvStore_UpdateString(uint64_t *rev, kvStore *kv, const char *key, const char *data, uint64_t last)
{
natsStatus s = kvStore_Update(rev, kv, key, (const void*) data, (int) strlen(data), last);
return NATS_UPDATE_ERR_STACK(s);
}
static natsStatus
_delete(kvStore *kv, const char *key, bool purge)
{
natsStatus s;
natsMsg *msg = NULL;
DEFINE_BUF_FOR_SUBJECT;
if (kv == NULL)
return nats_setDefaultError(NATS_INVALID_ARG);
if (!validKey(key))
return nats_setError(NATS_INVALID_ARG, "%s", kvErrInvalidKey);
BUILD_SUBJECT(USE_JS_PREFIX);
IFOK(s, natsMsg_Create(&msg, natsBuf_Data(&buf), NULL, NULL, 0));
if (s == NATS_OK)
{
if (purge)
{
s = natsMsgHeader_Set(msg, kvOpHeader, kvOpPurgeStr);
IFOK(s, natsMsgHeader_Set(msg, JSMsgRollup, JSMsgRollupSubject));
}
else
{
s = natsMsgHeader_Set(msg, kvOpHeader, kvOpDeleteStr);
}
}
IFOK(s, js_PublishMsg(NULL, kv->js, msg, NULL, NULL));
natsBuf_Cleanup(&buf);
natsMsg_Destroy(msg);
return NATS_UPDATE_ERR_STACK(s);
}
natsStatus
kvStore_Delete(kvStore *kv, const char *key)
{
natsStatus s = _delete(kv, key, false);
return NATS_UPDATE_ERR_STACK(s);
}
natsStatus
kvStore_Purge(kvStore *kv, const char *key)
{
natsStatus s = _delete(kv, key, true);
return NATS_UPDATE_ERR_STACK(s);
}
natsStatus
kvStore_PurgeDeletes(kvStore *kv, kvWatchOptions *opts)
{
natsStatus s;
kvWatcher *w = NULL;
kvEntry *e = NULL;
kvEntry *h = NULL;
kvEntry *t = NULL;
natsBuffer buf;
char buffer[128];
s = kvStore_WatchAll(&w, kv, opts);
if (s != NATS_OK)
return NATS_UPDATE_ERR_STACK(s);
while (s == NATS_OK)
{
s = kvWatcher_Next(&e, w, KV_WATCH_FOR_EVER);
if (s == NATS_OK)
{
if (e == NULL)
break;
if ((e->op == kvOp_Delete) || (e->op == kvOp_Purge))
{
if (t != NULL)
t->next = e;
else
h = e;
t = e;
}
}
}
if ((s == NATS_OK) && (h != NULL))
{
jsOptions po;
jsOptions_Init(&po);
natsBuf_InitWithBackend(&buf, buffer, 0, sizeof(buffer));
// Go over the list, even when s != NATS_OK so we destroy
// each entry and don't have a memory leak.
for (; h != NULL; )
{
natsBuf_Reset(&buf);
IFOK(s, natsBuf_Append(&buf, kv->pre, -1));
IFOK(s, natsBuf_Append(&buf, h->key, -1));
IFOK(s, natsBuf_AppendByte(&buf, '\0'));
if (s == NATS_OK)
{
po.Stream.Purge.Subject = (const char*) natsBuf_Data(&buf);
s = js_PurgeStream(kv->js, kv->stream, &po, NULL);
}
e = h;
h = h->next;
kvEntry_Destroy(e);
}
}
kvWatcher_Destroy(w);
return NATS_UPDATE_ERR_STACK(s);
}
static void
_freeWatcher(kvWatcher *w)
{
kvStore *kv = NULL;
natsSubscription_Destroy(w->sub);
natsMutex_Destroy(w->mu);
kv = w->kv;
NATS_FREE(w);
_releaseKV(kv);
}
static void
_releaseWatcher(kvWatcher *w)
{
bool doFree;
if (w == NULL)
return;
natsMutex_Lock(w->mu);
doFree = (--(w->refs) == 0);
natsMutex_Unlock(w->mu);
if (doFree)
_freeWatcher(w);
}
natsStatus
kvWatchOptions_Init(kvWatchOptions *opts)
{
if (opts == NULL)
return nats_setDefaultError(NATS_INVALID_ARG);
memset(opts, 0, sizeof(kvWatchOptions));
return NATS_OK;
}
natsStatus
kvWatcher_Next(kvEntry **new_entry, kvWatcher *w, int64_t timeout)
{
natsStatus s = NATS_OK;
kvEntry *e = NULL;
int64_t start;
if ((new_entry == NULL) || (w == NULL) || (timeout <= 0))
return nats_setDefaultError(NATS_INVALID_ARG);
*new_entry = NULL;
natsMutex_Lock(w->mu);
start = nats_Now();
GET_NEXT:
if (w->stopped)
{
s = nats_setDefaultError(NATS_ILLEGAL_STATE);
}
else if (w->retMarker)
{
// Will return a NULL entry (*new_entry is initialized to NULL).
// Mark that we should no longer check/return the "init done" marker.
w->retMarker = false;
}
else
{
natsMsg *msg = NULL;
uint64_t delta= 0;
w->refs++;
natsMutex_Unlock(w->mu);
s = natsSubscription_NextMsg(&msg, w->sub, timeout);
natsMutex_Lock(w->mu);
if (w->stopped)
{
natsMutex_Unlock(w->mu);
_releaseWatcher(w);
return NATS_ILLEGAL_STATE;
}
w->refs--;
if ((s == NATS_OK) && (strlen(msg->subject) <= strlen(w->kv->pre)))
s = nats_setError(NATS_ERR, "invalid update's subject '%s'", msg->subject);
if ((s == NATS_OK) && ((nats_IsStringEmpty(msg->reply) ||
((int) strlen(msg->reply) <= jsAckPrefixLen))))
{
s = nats_setError(NATS_ERR, "unable to get metadata from '%s'", msg->reply);
}
IFOK(s, js_getMetaData(msg->reply+jsAckPrefixLen,
NULL, NULL, NULL, NULL, &(msg->seq),
NULL, &(msg->time), &delta, 3));
IFOK(s, _createEntry(&e, w->kv, &msg));
if (s == NATS_OK)
{
e->delta = delta;
// Check if done with initial values
if (!w->initDone && (delta == 0))
{
w->initDone = true;
w->retMarker = true;
}
if (w->ignoreDel && ((e->op == kvOp_Delete) || e->op == kvOp_Purge))
{
kvEntry_Destroy(e);
e = NULL;
timeout -= (nats_Now() - start);
if (timeout > 0)
goto GET_NEXT;
else
s = nats_setDefaultError(NATS_TIMEOUT);
}
}
natsMsg_Destroy(msg);
}
natsMutex_Unlock(w->mu);
if (s == NATS_OK)
*new_entry = e;
return NATS_UPDATE_ERR_STACK(s);
}
void
kvWatcher_Destroy(kvWatcher *w)
{
kvWatcher_Stop(w);
_releaseWatcher(w);
}
natsStatus
kvStore_Watch(kvWatcher **new_watcher, kvStore *kv, const char *key, kvWatchOptions *opts)
{
natsStatus s;
kvWatcher *w = NULL;
jsSubOptions so;
DEFINE_BUF_FOR_SUBJECT;
if ((new_watcher == NULL) || (kv == NULL) || nats_IsStringEmpty(key))
return nats_setDefaultError(NATS_INVALID_ARG);
*new_watcher = NULL;
w = (kvWatcher*) NATS_CALLOC(1, sizeof(kvWatcher));
if (w == NULL)
return nats_setDefaultError(NATS_NO_MEMORY);
_retainKV(kv);
w->kv = kv;
w->refs = 1;
BUILD_SUBJECT(KEY_NAME_ONLY);
IFOK(s, natsMutex_Create(&(w->mu)));
if (s == NATS_OK)
{
natsStatus ls;
natsMsg *msg = NULL;
// Check if we have anything pending.
ls = js_GetLastMsg(&msg, kv->js, kv->stream, natsBuf_Data(&buf), NULL, NULL);
if (ls == NATS_OK)
natsMsg_Destroy(msg);
else
{
nats_clearLastError();
if (ls == NATS_NOT_FOUND)
{
w->initDone = true;
w->retMarker = true;
}
}
}
// Use ordered consumer to deliver results
if (s == NATS_OK)
{
jsSubOptions_Init(&so);
so.Ordered = true;
if ((opts == NULL) || !opts->IncludeHistory)
so.Config.DeliverPolicy = js_DeliverLastPerSubject;
if (opts != NULL)
{
if (opts->MetaOnly)
so.Config.HeadersOnly = true;
if (opts->IgnoreDeletes)
w->ignoreDel = true;
}
s = js_SubscribeSync(&(w->sub), kv->js, natsBuf_Data(&buf), NULL, &so, NULL);
}
natsBuf_Cleanup(&buf);
if (s == NATS_OK)
*new_watcher = w;
else
_freeWatcher(w);
return NATS_UPDATE_ERR_STACK(s);
}
natsStatus
kvStore_WatchAll(kvWatcher **new_watcher, kvStore *kv, kvWatchOptions *opts)
{
natsStatus s = kvStore_Watch(new_watcher, kv, ">", opts);
return NATS_UPDATE_ERR_STACK(s);
}
natsStatus
kvStore_Keys(kvKeysList *list, kvStore *kv, kvWatchOptions *opts)
{
natsStatus s;
kvWatchOptions o;
kvWatcher *w = NULL;
int count = 0;
KV_DEFINE_LIST;
if (list == NULL)
return nats_setDefaultError(NATS_INVALID_ARG);
list->Keys = NULL;
*(int*)&(list->Count) = 0;
kvWatchOptions_Init(&o);
if (opts != NULL)
memcpy(&o, opts, sizeof(kvWatchOptions));
o.IgnoreDeletes = true;
o.MetaOnly = true;
if (o.Timeout > 0)
timeout = o.Timeout;
s = kvStore_WatchAll(&w, kv, &o);
if (s != NATS_OK)
return NATS_UPDATE_ERR_STACK(s);
KV_GATHER_LIST;
// Don't need the watcher anymore.
kvWatcher_Destroy(w);
// On success, create the array of keys.
if ((s == NATS_OK) && (n > 0))
{
list->Keys = (char**) NATS_CALLOC(n, sizeof(char*));
if (list->Keys == NULL)
s = nats_setDefaultError(NATS_NO_MEMORY);
}
// Transfer keys to the array (on success), and destroy
// the entries if there was an error.
for (i=0; h != NULL; i++)
{
e = h;
h = h->next;
if (s == NATS_OK)
{
DUP_STRING(s, list->Keys[i], e->key);
if (s == NATS_OK)
count++;
}
kvEntry_Destroy(e);
}
// Set the list's Count to `count`, not `n` since `count`
// will reflect the actual number of keys that have been
// properly strdup'ed.
*(int*)&(list->Count) = count;
// If there was a failure (especially when strdup'ing) keys,
// this will do the proper cleanup and re-initialize the list.
if (s != NATS_OK)
kvKeysList_Destroy(list);
return NATS_UPDATE_ERR_STACK(s);
}
void
kvKeysList_Destroy(kvKeysList *list)
{
int i;
if ((list == NULL) || (list->Keys == NULL))
return;
for (i=0; i<list->Count; i++)
NATS_FREE(list->Keys[i]);
NATS_FREE(list->Keys);
list->Keys = NULL;
*(int*)&(list->Count) = 0;
}
natsStatus
kvStore_History(kvEntryList *list, kvStore *kv, const char *key, kvWatchOptions *opts)
{
natsStatus s;
kvWatchOptions o;
kvEntry *e = NULL;
kvEntry *h = NULL;
kvEntry *t = NULL;
int n = 0;
kvWatcher *w = NULL;
int64_t timeout = KV_WATCH_FOR_EVER;
int64_t start;
int i;
if (list == NULL)
return nats_setDefaultError(NATS_INVALID_ARG);
list->Entries = NULL;
*(int*)&(list->Count) = 0;
kvWatchOptions_Init(&o);
if (opts != NULL)
memcpy(&o, opts, sizeof(kvWatchOptions));
o.IncludeHistory = true;
if (o.Timeout > 0)
timeout = o.Timeout;
s = kvStore_Watch(&w, kv, key, &o);
if (s != NATS_OK)
return NATS_UPDATE_ERR_STACK(s);
KV_GATHER_LIST;
// Don't need the watcher anymore.
kvWatcher_Destroy(w);
// On success, create the array of entries.
if ((s == NATS_OK) && (n > 0))
{
list->Entries = (kvEntry**) calloc(n, sizeof(kvEntry*));
if (list->Entries == NULL)
s = nats_setDefaultError(NATS_NO_MEMORY);
else
*(int*)&(list->Count) = n;
}
// Transfer entries to the array (on success), or destroy
// the entries if there was an error.
for (i=0; h != NULL; i++)
{
e = h;
h = h->next;
if (s == NATS_OK)
list->Entries[i] = e;
else
kvEntry_Destroy(e);
}
return NATS_UPDATE_ERR_STACK(s);
}
void