Remove old store implementation.

[cumulus.git] / tarstore.h

diff --git a/tarstore.h b/tarstore.h
index 009dd90..6acee7f 100644 (file)
--- a/tarstore.h
+++ b/tarstore.h
@@ -12,11 +12,31 @@
 #include <stdint.h>
 #include <libtar.h>
 
+#include <list>
+#include <map>
+#include <set>
 #include <string>
 #include <iostream>
 #include <sstream>
 
-#include "store.h"
+#include "sha1.h"
+
+/* In memory datatype to represent key/value pairs of information, such as file
+ * metadata.  Currently implemented as map<string, string>. */
+typedef std::map<std::string, std::string> dictionary;
+
+/* IOException will be thrown if an error occurs while reading or writing in
+ * one of the I/O wrappers.  Depending upon the context; this may be fatal or
+ * not--typically, errors reading/writing the store will be serious, but errors
+ * reading an individual file are less so. */
+class IOException : public std::exception {
+private:
+    std::string error;
+public:
+    explicit IOException(const std::string &err) { error = err; }
+    virtual ~IOException() throw () { }
+    std::string getError() const { return error; }
+};
 
 /* A simple wrapper around a single TAR file to represent a segment.  Objects
  * may only be written out all at once, since the tar header must be written
@@ -28,10 +48,14 @@ public:
 
     void write_object(int id, const char *data, size_t len);
 
-private:
+    // Return an estimate of the size of the file.
+    size_t size_estimate() { return size; }
+
     void internal_write_object(const std::string &path,
                                const char *data, size_t len);
 
+private:
+    size_t size;
     std::string segment_name;
     std::ostringstream checksums;
     TAR *t;
@@ -48,7 +72,8 @@ public:
     // used to control object placement; objects with different group
     // parameters are kept in separate segments.
     std::string write_object(const char *data, size_t len,
-                             const std::string &group = "");
+                             const std::string &group = "",
+                             const std::list<std::string> &refs = norefs);
 
     // Ensure all segments have been fully written.
     void sync();
@@ -56,12 +81,24 @@ public:
 private:
     struct segment_info {
         Tarfile *file;
-        std::string name;       // UUID
-        int count;              // Objects written to this segment
+        std::string name;           // UUID
+        std::set<std::string> refs; // Other segments this one refers to
+        int count;                  // Objects written to this segment
     };
 
     std::string path;
     std::map<std::string, struct segment_info *> segments;
+
+    // An empty list which can be used as an argument to write_object to
+    // indicate that this object depends on no others.
+    static std::list<std::string> norefs;
+
+    // Ensure that all segments in the given group have been fully written.
+    void close_segment(const std::string &group);
+
+    // Parse an object reference string and return just the segment name
+    // portion.
+    std::string object_reference_to_segment(const std::string &object);
 };
 
 #endif // _LBS_TARSTORE_H