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ArqPackSet.m
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ArqPackSet.m
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//
// ArqPackSet.m
// Arq
//
// Created by Stefan Reitshamer on 6/22/10.
// Copyright 2010 __MyCompanyName__. All rights reserved.
//
#import "ArqPackSet.h"
#import "S3Service.h"
#import "RegexKitLite.h"
#import "DiskPackIndex.h"
#import "PackIndexEntry.h"
#import "SetNSError.h"
#import "NSErrorCodes.h"
#import "DiskPack.h"
#import "AppKeychain.h"
#import "S3AuthorizationProvider.h"
#import "NSError_extra.h"
#define MAX_RETRIES (10)
@interface ArqPackSet (internal)
- (ServerBlob *)newInternalServerBlobForSHA1:(NSString *)sha1 error:(NSError **)error;
- (NSDictionary *)doLoadPackIndexEntries:(NSError **)error;
@end
@implementation ArqPackSet
+ (NSString *)errorDomain {
return @"ArqPackSetErrorDomain";
}
+ (BOOL)cachePackSetIndexesForS3BucketName:(NSString *)theS3BucketName computerUUID:(NSString *)theComputerUUID error:(NSError **)error {
NSString *accessKeyID;
NSString *secretAccessKey;
if (![AppKeychain accessKeyID:&accessKeyID secretAccessKey:&secretAccessKey error:error]) {
return NO;
}
S3AuthorizationProvider *sap = [[[S3AuthorizationProvider alloc] initWithAccessKey:accessKeyID secretKey:secretAccessKey] autorelease];
S3Service *theS3 = [[[S3Service alloc] initWithS3AuthorizationProvider:sap useSSL:YES retryOnNetworkError:YES] autorelease];
NSString *packSetsPrefix = [NSString stringWithFormat:@"/%@/%@/packsets/", theS3BucketName, theComputerUUID];
NSArray *packPaths = [theS3 pathsWithPrefix:packSetsPrefix error:error];
if (packPaths == nil) {
return NO;
}
for (NSString *packPath in packPaths) {
NSString *pattern = [NSString stringWithFormat:@"/%@/%@/packsets/([^/]+)/(\\w+)\\.pack", theS3BucketName, theComputerUUID];
NSRange sha1Range = [packPath rangeOfRegex:pattern capture:2];
if (sha1Range.location != NSNotFound) {
NSString *packSHA1 = [packPath substringWithRange:sha1Range];
NSString *thePackSetName = [packPath substringWithRange:[packPath rangeOfRegex:pattern capture:1]];
DiskPackIndex *dpi = [[[DiskPackIndex alloc] initWithS3Service:theS3 s3BucketName:theS3BucketName computerUUID:theComputerUUID packSetName:thePackSetName packSHA1:packSHA1] autorelease];
if (![dpi makeLocal:error]) {
return NO;
}
}
}
return YES;
}
- (id)initWithS3Service:(S3Service *)theS3
s3BucketName:(NSString *)theS3BucketName
computerUUID:(NSString *)theComputerUUID
packSetName:(NSString *)thePackSetName {
if (self = [super init]) {
s3 = [theS3 retain];
s3BucketName = [theS3BucketName retain];
computerUUID = [theComputerUUID retain];
packSetName = [thePackSetName retain];
}
return self;
}
- (void)dealloc {
[s3 release];
[s3BucketName release];
[computerUUID release];
[packSetName release];
[packIndexEntries release];
[super dealloc];
}
- (NSString *)packSetName {
return packSetName;
}
- (BOOL)packSHA1:(NSString **)packSHA1 forPackedSHA1:(NSString *)packedSHA1 error:(NSError **)error {
if (packIndexEntries == nil) {
NSDictionary *entries = [self doLoadPackIndexEntries:error];
if (entries == nil) {
return NO;
}
packIndexEntries = [entries retain];
}
*packSHA1 = nil;
PackIndexEntry *pie = [packIndexEntries objectForKey:packedSHA1];
if (pie != nil) {
*packSHA1 = [pie packSHA1];
}
return YES;
}
- (ServerBlob *)newServerBlobForSHA1:(NSString *)sha1 error:(NSError **)error {
ServerBlob *sb = nil;
NSError *myError = nil;
NSUInteger i = 0;
for (i = 0; i < MAX_RETRIES; i++) {
sb = [self newInternalServerBlobForSHA1:sha1 error:&myError];
if (sb == nil) {
if ([myError isErrorWithDomain:[ArqPackSet errorDomain] code:ERROR_PACK_INDEX_ENTRY_NOT_RESOLVABLE]) {
HSLogInfo(@"pack index entry not resolvable; reloading pack index entries from disk cache");
[packIndexEntries release];
packIndexEntries = nil;
} else {
break;
}
} else {
break;
}
}
if (sb == nil) {
if ([myError isErrorWithDomain:[ArqPackSet errorDomain] code:ERROR_PACK_INDEX_ENTRY_NOT_RESOLVABLE]) {
SETNSERROR([ArqPackSet errorDomain], ERROR_NOT_FOUND, @"failed %u times to load blob for sha1 %@ from pack set %@", i, sha1, packSetName);
} else if (error != NULL) {
*error = myError;
}
}
return sb;
}
@end
@implementation ArqPackSet (internal)
- (ServerBlob *)newInternalServerBlobForSHA1:(NSString *)sha1 error:(NSError **)error {
if (packIndexEntries == nil) {
NSDictionary *entries = [self doLoadPackIndexEntries:error];
if (entries == nil) {
return nil;
}
packIndexEntries = [entries retain];
}
PackIndexEntry *pie = [packIndexEntries objectForKey:sha1];
if (pie == nil) {
SETNSERROR([ArqPackSet errorDomain], ERROR_NOT_FOUND, @"sha1 %@ not found in pack set %@", sha1, packSetName);
return NO;
}
DiskPack *diskPack = [[DiskPack alloc] initWithS3Service:s3 s3BucketName:s3BucketName computerUUID:computerUUID packSetName:packSetName packSHA1:[pie packSHA1]];
ServerBlob *sb = nil;
do {
NSError *myError = nil;
if (![diskPack makeLocal:&myError]) {
NSString *msg = [NSString stringWithFormat:@"error making disk pack %@ (pack set %@, computerUUID %@, s3BucketName %@) containing sha1 %@ local: %@", [pie packSHA1], packSetName, computerUUID, s3BucketName, sha1, [myError localizedDescription]];
HSLogError(@"%@", msg);
SETNSERROR([ArqPackSet errorDomain], ERROR_PACK_INDEX_ENTRY_NOT_RESOLVABLE, @"%@", msg);
break;
}
sb = [diskPack newServerBlobForObjectAtOffset:[pie offset] error:&myError];
if (sb == nil) {
SETNSERROR([ArqPackSet errorDomain], ERROR_PACK_INDEX_ENTRY_NOT_RESOLVABLE, @"error reading sha1 %@ from disk pack %@ (pack set %@, computerUUID %@, s3BucketName %@): %@", sha1, [pie packSHA1], packSetName, computerUUID, s3BucketName, [myError localizedDescription]);
break;
}
} while(0);
[diskPack release];
return sb;
}
- (NSDictionary *)doLoadPackIndexEntries:(NSError **)error {
NSMutableDictionary *entries = [NSMutableDictionary dictionary];
NSString *packSHA1Prefix = [NSString stringWithFormat:@"/%@/%@/packsets/%@/", s3BucketName, computerUUID, packSetName];
NSArray *packSHA1Paths = [s3 pathsWithPrefix:packSHA1Prefix error:error];
if (packSHA1Paths == nil) {
return nil;
}
for (NSString *packSHA1Path in packSHA1Paths) {
NSRange sha1Range = [packSHA1Path rangeOfRegex:@"/(\\w+)\\.pack$" capture:1];
if (sha1Range.location != NSNotFound) {
NSString *packSHA1 = [packSHA1Path substringWithRange:sha1Range];
BOOL ret = NO;
DiskPackIndex *index = [[DiskPackIndex alloc] initWithS3Service:s3 s3BucketName:s3BucketName computerUUID:computerUUID packSetName:packSetName packSHA1:packSHA1];
do {
if (![index makeLocal:error]) {
break;
}
NSArray *pies = [index allPackIndexEntries:error];
if (pies == nil) {
break;
}
HSLogDebug(@"found %u entries in s3 pack sha1 %@ packset %@ computer %@ s3bucket %@", [pies count], packSHA1, packSetName, computerUUID, s3BucketName);
for (PackIndexEntry *pie in pies) {
[entries setObject:pie forKey:[pie objectSHA1]];
}
ret = YES;
} while (0);
[index release];
if (!ret) {
return nil;
}
}
}
return entries;
}
@end