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/** |
| 2 |
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* This file is part of the CernVM File System. |
| 3 |
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* |
| 4 |
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* A demo external cache plugin. All data is stored in std::string. Feature- |
| 5 |
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* complete but quite inefficient. |
| 6 |
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*/ |
| 7 |
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| 8 |
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#define __STDC_FORMAT_MACROS |
| 9 |
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| 10 |
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#include <alloca.h> |
| 11 |
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#include <fcntl.h> |
| 12 |
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#include <inttypes.h> |
| 13 |
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#include <stdint.h> |
| 14 |
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#include <sys/types.h> |
| 15 |
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#include <sys/wait.h> |
| 16 |
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#include <unistd.h> |
| 17 |
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| 18 |
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#include <cassert> |
| 19 |
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#include <cstdio> |
| 20 |
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#include <cstring> |
| 21 |
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#include <ctime> |
| 22 |
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#include <map> |
| 23 |
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#include <string> |
| 24 |
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#include <vector> |
| 25 |
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| 26 |
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#include "libcvmfs_cache.h" |
| 27 |
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| 28 |
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using namespace std; // NOLINT |
| 29 |
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| 30 |
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struct Object { |
| 31 |
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struct cvmcache_hash id; |
| 32 |
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string data; |
| 33 |
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cvmcache_object_type type; |
| 34 |
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int32_t refcnt; |
| 35 |
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string description; |
| 36 |
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}; |
| 37 |
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| 38 |
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struct TxnInfo { |
| 39 |
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struct cvmcache_hash id; |
| 40 |
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Object partial_object; |
| 41 |
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}; |
| 42 |
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| 43 |
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struct Listing { |
| 44 |
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✗ |
Listing() : type(CVMCACHE_OBJECT_REGULAR), pos(0), elems(NULL) { } |
| 45 |
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cvmcache_object_type type; |
| 46 |
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uint64_t pos; |
| 47 |
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vector<Object> *elems; |
| 48 |
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}; |
| 49 |
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| 50 |
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struct ComparableHash { |
| 51 |
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ComparableHash() { memset(&hash, 0, sizeof(hash)); } |
| 52 |
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✗ |
explicit ComparableHash(const struct cvmcache_hash &h) : hash(h) { } |
| 53 |
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struct cvmcache_hash hash; |
| 54 |
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✗ |
bool operator<(const ComparableHash &other) const { |
| 55 |
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✗ |
return cvmcache_hash_cmp(const_cast<cvmcache_hash *>(&(this->hash)), |
| 56 |
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✗ |
const_cast<cvmcache_hash *>(&(other.hash))) |
| 57 |
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✗ |
< 0; |
| 58 |
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} |
| 59 |
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}; |
| 60 |
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| 61 |
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map<uint64_t, TxnInfo> transactions; |
| 62 |
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map<ComparableHash, Object> storage; |
| 63 |
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map<uint64_t, Listing> listings; |
| 64 |
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map<std::string, cvmcache_breadcrumb> breadcrumbs; |
| 65 |
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| 66 |
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struct cvmcache_context *ctx; |
| 67 |
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| 68 |
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✗ |
static int null_chrefcnt(struct cvmcache_hash *id, int32_t change_by) { |
| 69 |
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✗ |
const ComparableHash h(*id); |
| 70 |
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✗ |
if (storage.find(h) == storage.end()) |
| 71 |
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✗ |
return CVMCACHE_STATUS_NOENTRY; |
| 72 |
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| 73 |
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✗ |
Object obj = storage[h]; |
| 74 |
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✗ |
obj.refcnt += change_by; |
| 75 |
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if (obj.refcnt < 0) |
| 76 |
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return CVMCACHE_STATUS_BADCOUNT; |
| 77 |
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storage[h] = obj; |
| 78 |
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✗ |
return CVMCACHE_STATUS_OK; |
| 79 |
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} |
| 80 |
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| 81 |
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| 82 |
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✗ |
static int null_obj_info(struct cvmcache_hash *id, |
| 83 |
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struct cvmcache_object_info *info) { |
| 84 |
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✗ |
const ComparableHash h(*id); |
| 85 |
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✗ |
if (storage.find(h) == storage.end()) |
| 86 |
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return CVMCACHE_STATUS_NOENTRY; |
| 87 |
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| 88 |
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✗ |
const Object obj = storage[h]; |
| 89 |
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✗ |
info->size = obj.data.length(); |
| 90 |
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info->type = obj.type; |
| 91 |
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info->pinned = obj.refcnt > 0; |
| 92 |
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✗ |
info->description = strdup(obj.description.c_str()); |
| 93 |
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✗ |
return CVMCACHE_STATUS_OK; |
| 94 |
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} |
| 95 |
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| 96 |
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| 97 |
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✗ |
static int null_pread(struct cvmcache_hash *id, |
| 98 |
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uint64_t offset, |
| 99 |
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uint32_t *size, |
| 100 |
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unsigned char *buffer) { |
| 101 |
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✗ |
const ComparableHash h(*id); |
| 102 |
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✗ |
string data = storage[h].data; |
| 103 |
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✗ |
if (offset > data.length()) |
| 104 |
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✗ |
return CVMCACHE_STATUS_OUTOFBOUNDS; |
| 105 |
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const unsigned nbytes = |
| 106 |
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✗ |
std::min(*size, static_cast<uint32_t>(data.length() - offset)); |
| 107 |
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✗ |
memcpy(buffer, data.data() + offset, nbytes); |
| 108 |
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✗ |
*size = nbytes; |
| 109 |
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✗ |
return CVMCACHE_STATUS_OK; |
| 110 |
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} |
| 111 |
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| 112 |
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| 113 |
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✗ |
static int null_start_txn(struct cvmcache_hash *id, |
| 114 |
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uint64_t txn_id, |
| 115 |
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struct cvmcache_object_info *info) { |
| 116 |
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✗ |
Object partial_object; |
| 117 |
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✗ |
partial_object.id = *id; |
| 118 |
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✗ |
partial_object.type = info->type; |
| 119 |
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✗ |
partial_object.refcnt = 1; |
| 120 |
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✗ |
if (info->description != NULL) |
| 121 |
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✗ |
partial_object.description = string(info->description); |
| 122 |
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✗ |
TxnInfo txn; |
| 123 |
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✗ |
txn.id = *id; |
| 124 |
|
✗ |
txn.partial_object = partial_object; |
| 125 |
|
✗ |
transactions[txn_id] = txn; |
| 126 |
|
✗ |
return CVMCACHE_STATUS_OK; |
| 127 |
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} |
| 128 |
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| 129 |
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| 130 |
|
✗ |
static int null_write_txn(uint64_t txn_id, |
| 131 |
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unsigned char *buffer, |
| 132 |
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uint32_t size) { |
| 133 |
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✗ |
TxnInfo txn = transactions[txn_id]; |
| 134 |
|
✗ |
txn.partial_object.data += string(reinterpret_cast<char *>(buffer), size); |
| 135 |
|
✗ |
transactions[txn_id] = txn; |
| 136 |
|
✗ |
return CVMCACHE_STATUS_OK; |
| 137 |
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} |
| 138 |
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| 139 |
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| 140 |
|
✗ |
static int null_commit_txn(uint64_t txn_id) { |
| 141 |
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✗ |
const TxnInfo txn = transactions[txn_id]; |
| 142 |
|
✗ |
const ComparableHash h(txn.id); |
| 143 |
|
✗ |
storage[h] = txn.partial_object; |
| 144 |
|
✗ |
transactions.erase(txn_id); |
| 145 |
|
✗ |
return CVMCACHE_STATUS_OK; |
| 146 |
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} |
| 147 |
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| 148 |
|
✗ |
static int null_abort_txn(uint64_t txn_id) { |
| 149 |
|
✗ |
transactions.erase(txn_id); |
| 150 |
|
✗ |
return CVMCACHE_STATUS_OK; |
| 151 |
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} |
| 152 |
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| 153 |
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✗ |
static int null_info(struct cvmcache_info *info) { |
| 154 |
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✗ |
info->size_bytes = uint64_t(-1); |
| 155 |
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✗ |
info->used_bytes = info->pinned_bytes = 0; |
| 156 |
|
✗ |
for (map<ComparableHash, Object>::const_iterator i = storage.begin(), |
| 157 |
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✗ |
i_end = storage.end(); |
| 158 |
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✗ |
i != i_end; |
| 159 |
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✗ |
++i) { |
| 160 |
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info->used_bytes += i->second.data.length(); |
| 161 |
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✗ |
if (i->second.refcnt > 0) |
| 162 |
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✗ |
info->pinned_bytes += i->second.data.length(); |
| 163 |
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} |
| 164 |
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info->no_shrink = 0; |
| 165 |
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✗ |
return CVMCACHE_STATUS_OK; |
| 166 |
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} |
| 167 |
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| 168 |
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✗ |
static int null_shrink(uint64_t shrink_to, uint64_t *used) { |
| 169 |
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struct cvmcache_info info; |
| 170 |
|
✗ |
null_info(&info); |
| 171 |
|
✗ |
*used = info.used_bytes; |
| 172 |
|
✗ |
if (info.used_bytes <= shrink_to) |
| 173 |
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✗ |
return CVMCACHE_STATUS_OK; |
| 174 |
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| 175 |
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// Volatile objects |
| 176 |
|
✗ |
for (map<ComparableHash, Object>::iterator i = storage.begin(), |
| 177 |
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✗ |
i_end = storage.end(); |
| 178 |
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✗ |
i != i_end;) { |
| 179 |
|
✗ |
if ((i->second.refcnt > 0) |
| 180 |
|
✗ |
|| (i->second.type != CVMCACHE_OBJECT_VOLATILE)) { |
| 181 |
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✗ |
++i; |
| 182 |
|
✗ |
continue; |
| 183 |
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} |
| 184 |
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✗ |
const unsigned length = i->second.data.length(); |
| 185 |
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✗ |
const map<ComparableHash, Object>::iterator delete_me = i++; |
| 186 |
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✗ |
storage.erase(delete_me); |
| 187 |
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✗ |
info.used_bytes -= length; |
| 188 |
|
✗ |
if (info.used_bytes <= shrink_to) { |
| 189 |
|
✗ |
*used = info.used_bytes; |
| 190 |
|
✗ |
return CVMCACHE_STATUS_OK; |
| 191 |
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} |
| 192 |
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} |
| 193 |
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// All other objects |
| 194 |
|
✗ |
for (map<ComparableHash, Object>::iterator i = storage.begin(), |
| 195 |
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✗ |
i_end = storage.end(); |
| 196 |
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✗ |
i != i_end;) { |
| 197 |
|
✗ |
if (i->second.refcnt > 0) { |
| 198 |
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✗ |
++i; |
| 199 |
|
✗ |
continue; |
| 200 |
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} |
| 201 |
|
✗ |
const unsigned length = i->second.data.length(); |
| 202 |
|
✗ |
const map<ComparableHash, Object>::iterator delete_me = i++; |
| 203 |
|
✗ |
storage.erase(delete_me); |
| 204 |
|
✗ |
info.used_bytes -= length; |
| 205 |
|
✗ |
if (info.used_bytes <= shrink_to) { |
| 206 |
|
✗ |
*used = info.used_bytes; |
| 207 |
|
✗ |
return CVMCACHE_STATUS_OK; |
| 208 |
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} |
| 209 |
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} |
| 210 |
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|
| 211 |
|
✗ |
*used = info.used_bytes; |
| 212 |
|
✗ |
return CVMCACHE_STATUS_PARTIAL; |
| 213 |
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} |
| 214 |
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| 215 |
|
✗ |
static int null_listing_begin(uint64_t lst_id, enum cvmcache_object_type type) { |
| 216 |
|
✗ |
Listing lst; |
| 217 |
|
✗ |
lst.type = type; |
| 218 |
|
✗ |
lst.elems = new vector<Object>(); |
| 219 |
|
✗ |
for (map<ComparableHash, Object>::const_iterator i = storage.begin(), |
| 220 |
|
✗ |
i_end = storage.end(); |
| 221 |
|
✗ |
i != i_end; |
| 222 |
|
✗ |
++i) { |
| 223 |
|
✗ |
lst.elems->push_back(i->second); |
| 224 |
|
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} |
| 225 |
|
✗ |
listings[lst_id] = lst; |
| 226 |
|
✗ |
return CVMCACHE_STATUS_OK; |
| 227 |
|
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} |
| 228 |
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|
| 229 |
|
✗ |
static int null_listing_next(int64_t listing_id, |
| 230 |
|
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struct cvmcache_object_info *item) { |
| 231 |
|
✗ |
Listing lst = listings[listing_id]; |
| 232 |
|
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do { |
| 233 |
|
✗ |
if (lst.pos >= lst.elems->size()) |
| 234 |
|
✗ |
return CVMCACHE_STATUS_OUTOFBOUNDS; |
| 235 |
|
|
|
| 236 |
|
✗ |
vector<Object> *elems = lst.elems; |
| 237 |
|
✗ |
if ((*elems)[lst.pos].type == lst.type) { |
| 238 |
|
✗ |
item->id = (*elems)[lst.pos].id; |
| 239 |
|
✗ |
item->size = (*elems)[lst.pos].data.length(); |
| 240 |
|
✗ |
item->type = (*elems)[lst.pos].type; |
| 241 |
|
✗ |
item->pinned = (*elems)[lst.pos].refcnt > 0; |
| 242 |
|
✗ |
item->description = (*elems)[lst.pos].description.empty() |
| 243 |
|
✗ |
? NULL |
| 244 |
|
✗ |
: strdup((*elems)[lst.pos].description.c_str()); |
| 245 |
|
✗ |
break; |
| 246 |
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} |
| 247 |
|
✗ |
lst.pos++; |
| 248 |
|
✗ |
} while (true); |
| 249 |
|
✗ |
lst.pos++; |
| 250 |
|
✗ |
listings[listing_id] = lst; |
| 251 |
|
✗ |
return CVMCACHE_STATUS_OK; |
| 252 |
|
|
} |
| 253 |
|
|
|
| 254 |
|
✗ |
static int null_listing_end(int64_t listing_id) { |
| 255 |
|
✗ |
delete listings[listing_id].elems; |
| 256 |
|
✗ |
listings.erase(listing_id); |
| 257 |
|
✗ |
return CVMCACHE_STATUS_OK; |
| 258 |
|
|
} |
| 259 |
|
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|
| 260 |
|
✗ |
static int null_breadcrumb_store(const char *fqrn, |
| 261 |
|
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const cvmcache_breadcrumb *breadcrumb) { |
| 262 |
|
✗ |
breadcrumbs[fqrn] = *breadcrumb; |
| 263 |
|
✗ |
return CVMCACHE_STATUS_OK; |
| 264 |
|
|
} |
| 265 |
|
|
|
| 266 |
|
✗ |
static int null_breadcrumb_load(const char *fqrn, |
| 267 |
|
|
cvmcache_breadcrumb *breadcrumb) { |
| 268 |
|
|
const map<std::string, cvmcache_breadcrumb>::const_iterator itr = |
| 269 |
|
✗ |
breadcrumbs.find(fqrn); |
| 270 |
|
✗ |
if (itr == breadcrumbs.end()) |
| 271 |
|
✗ |
return CVMCACHE_STATUS_NOENTRY; |
| 272 |
|
✗ |
*breadcrumb = itr->second; |
| 273 |
|
✗ |
return CVMCACHE_STATUS_OK; |
| 274 |
|
|
} |
| 275 |
|
|
|
| 276 |
|
✗ |
static void Usage(const char *progname) { |
| 277 |
|
✗ |
printf("%s <config file>\n", progname); |
| 278 |
|
|
} |
| 279 |
|
|
|
| 280 |
|
|
|
| 281 |
|
✗ |
int main(int argc, char **argv) { |
| 282 |
|
✗ |
if (argc < 2) { |
| 283 |
|
✗ |
Usage(argv[0]); |
| 284 |
|
✗ |
return 1; |
| 285 |
|
|
} |
| 286 |
|
|
|
| 287 |
|
✗ |
cvmcache_init_global(); |
| 288 |
|
|
|
| 289 |
|
✗ |
cvmcache_option_map *options = cvmcache_options_init(); |
| 290 |
|
✗ |
if (cvmcache_options_parse(options, argv[1]) != 0) { |
| 291 |
|
✗ |
printf("cannot parse options file %s\n", argv[1]); |
| 292 |
|
✗ |
return 1; |
| 293 |
|
|
} |
| 294 |
|
✗ |
char *locator = cvmcache_options_get(options, "CVMFS_CACHE_PLUGIN_LOCATOR"); |
| 295 |
|
✗ |
if (locator == NULL) { |
| 296 |
|
✗ |
printf("CVMFS_CACHE_PLUGIN_LOCATOR missing\n"); |
| 297 |
|
✗ |
cvmcache_options_fini(options); |
| 298 |
|
✗ |
return 1; |
| 299 |
|
|
} |
| 300 |
|
✗ |
char *test_mode = cvmcache_options_get(options, "CVMFS_CACHE_PLUGIN_TEST"); |
| 301 |
|
|
|
| 302 |
|
✗ |
if (!test_mode) |
| 303 |
|
✗ |
cvmcache_spawn_watchdog(NULL); |
| 304 |
|
|
|
| 305 |
|
|
struct cvmcache_callbacks callbacks; |
| 306 |
|
✗ |
memset(&callbacks, 0, sizeof(callbacks)); |
| 307 |
|
✗ |
callbacks.cvmcache_chrefcnt = null_chrefcnt; |
| 308 |
|
✗ |
callbacks.cvmcache_obj_info = null_obj_info; |
| 309 |
|
✗ |
callbacks.cvmcache_pread = null_pread; |
| 310 |
|
✗ |
callbacks.cvmcache_start_txn = null_start_txn; |
| 311 |
|
✗ |
callbacks.cvmcache_write_txn = null_write_txn; |
| 312 |
|
✗ |
callbacks.cvmcache_commit_txn = null_commit_txn; |
| 313 |
|
✗ |
callbacks.cvmcache_abort_txn = null_abort_txn; |
| 314 |
|
✗ |
callbacks.cvmcache_info = null_info; |
| 315 |
|
✗ |
callbacks.cvmcache_shrink = null_shrink; |
| 316 |
|
✗ |
callbacks.cvmcache_listing_begin = null_listing_begin; |
| 317 |
|
✗ |
callbacks.cvmcache_listing_next = null_listing_next; |
| 318 |
|
✗ |
callbacks.cvmcache_listing_end = null_listing_end; |
| 319 |
|
✗ |
callbacks.cvmcache_breadcrumb_store = null_breadcrumb_store; |
| 320 |
|
✗ |
callbacks.cvmcache_breadcrumb_load = null_breadcrumb_load; |
| 321 |
|
✗ |
callbacks.capabilities = CVMCACHE_CAP_ALL_V2; |
| 322 |
|
|
|
| 323 |
|
✗ |
ctx = cvmcache_init(&callbacks); |
| 324 |
|
✗ |
const int retval = cvmcache_listen(ctx, locator); |
| 325 |
|
✗ |
if (!retval) { |
| 326 |
|
✗ |
fprintf(stderr, "failed to listen on %s\n", locator); |
| 327 |
|
✗ |
return 1; |
| 328 |
|
|
} |
| 329 |
|
|
|
| 330 |
|
✗ |
if (test_mode) { |
| 331 |
|
|
// Daemonize, print out PID |
| 332 |
|
|
pid_t pid; |
| 333 |
|
|
int statloc; |
| 334 |
|
✗ |
if ((pid = fork()) == 0) { |
| 335 |
|
✗ |
if ((pid = fork()) == 0) { |
| 336 |
|
✗ |
const int null_read = open("/dev/null", O_RDONLY); |
| 337 |
|
✗ |
const int null_write = open("/dev/null", O_WRONLY); |
| 338 |
|
✗ |
assert((null_read >= 0) && (null_write >= 0)); |
| 339 |
|
✗ |
int retval = dup2(null_read, 0); |
| 340 |
|
✗ |
assert(retval == 0); |
| 341 |
|
✗ |
retval = dup2(null_write, 1); |
| 342 |
|
✗ |
assert(retval == 1); |
| 343 |
|
✗ |
retval = dup2(null_write, 2); |
| 344 |
|
✗ |
assert(retval == 2); |
| 345 |
|
✗ |
close(null_read); |
| 346 |
|
✗ |
close(null_write); |
| 347 |
|
|
} else { |
| 348 |
|
✗ |
assert(pid > 0); |
| 349 |
|
✗ |
printf("%d\n", pid); |
| 350 |
|
✗ |
fflush(stdout); |
| 351 |
|
✗ |
fsync(1); |
| 352 |
|
✗ |
_exit(0); |
| 353 |
|
|
} |
| 354 |
|
|
} else { |
| 355 |
|
✗ |
assert(pid > 0); |
| 356 |
|
✗ |
waitpid(pid, &statloc, 0); |
| 357 |
|
✗ |
_exit(0); |
| 358 |
|
|
} |
| 359 |
|
|
} |
| 360 |
|
|
|
| 361 |
|
✗ |
printf("Listening for cvmfs clients on %s\n", locator); |
| 362 |
|
✗ |
printf("NOTE: this process needs to run as user cvmfs\n\n"); |
| 363 |
|
|
|
| 364 |
|
|
// Starts the I/O processing thread |
| 365 |
|
✗ |
cvmcache_process_requests(ctx, 0); |
| 366 |
|
|
|
| 367 |
|
✗ |
if (test_mode) |
| 368 |
|
|
while (true) |
| 369 |
|
✗ |
sleep(1); |
| 370 |
|
|
|
| 371 |
|
✗ |
if (!cvmcache_is_supervised()) { |
| 372 |
|
✗ |
printf("Press <R ENTER> to ask clients to release nested catalogs\n"); |
| 373 |
|
✗ |
printf("Press <Ctrl+D> to quit\n"); |
| 374 |
|
|
while (true) { |
| 375 |
|
|
char buf; |
| 376 |
|
✗ |
const int retval = read(fileno(stdin), &buf, 1); |
| 377 |
|
✗ |
if (retval != 1) |
| 378 |
|
✗ |
break; |
| 379 |
|
✗ |
if (buf == 'R') { |
| 380 |
|
✗ |
printf(" ... asking clients to release nested catalogs\n"); |
| 381 |
|
✗ |
cvmcache_ask_detach(ctx); |
| 382 |
|
|
} |
| 383 |
|
|
} |
| 384 |
|
✗ |
cvmcache_terminate(ctx); |
| 385 |
|
|
} |
| 386 |
|
|
|
| 387 |
|
✗ |
cvmcache_wait_for(ctx); |
| 388 |
|
✗ |
printf(" ... good bye\n"); |
| 389 |
|
|
|
| 390 |
|
✗ |
cvmcache_options_free(locator); |
| 391 |
|
✗ |
cvmcache_options_fini(options); |
| 392 |
|
✗ |
cvmcache_terminate_watchdog(); |
| 393 |
|
✗ |
cvmcache_cleanup_global(); |
| 394 |
|
✗ |
return 0; |
| 395 |
|
|
} |
| 396 |
|
|
|