Import the storage application.
This is a small abstraction layer on top of mnesia. It simplifies table management and addition of replicas and nodes. Some things to add in the near future: * Removing nodes from a mnesia cluster is not supported. * Observability and event handling is missing. While it's possible to perform the aformentioned functions with the mnesia own APIs, adding some simplifications for day to day management may be a good idea. However, the library is already used in another project and it's good enough for an initial use. It will be extended if and when required.main
absc
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.PHONY: all clean
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all:
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${MAKE} -C src
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clean:
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${MAKE} -C src clean
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{application, storage,
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[{description, "Cluster storage server"},
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{vsn, "1.0.0"},
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{modules, [
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storage_app,
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storage,
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storage_supervisor
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]},
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{registered, [
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storage,
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storage_supervisor
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]},
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{applications, [
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kernel,
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stdlib,
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mnesia
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]},
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{mod, {storage_app, []}},
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{start_phases, []}
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]}.
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%
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% Copyright (c) 2024 Andrea Biscuola <a@abiscuola.com>
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%
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% Permission to use, copy, modify, and distribute this software for any
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% purpose with or without fee is hereby granted, provided that the above
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% copyright notice and this permission notice appear in all copies.
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%
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% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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%
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-record(object, {key :: term(),
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value :: term(),
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metadata = [] :: list({atom(), term()})}).
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{".gmi", "text/gemini"}.
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{".gmni", "text/gemini"}.
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{".atom", "application/atom+xml"}.
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{".woff", "application/font-woff"}.
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{".jar", "application/java-archive"}.
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{".war", "application/java-archive"}.
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{".ear", "application/java-archive"}.
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{".js", "application/javascript"}.
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{".json", "application/json"}.
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{".hqx", "application/mac-binhex40"}.
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{".doc", "application/msword"}.
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{".bin", "application/octet-stream"}.
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{".exe", "application/octet-stream"}.
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{".dll", "application/octet-stream"}.
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{".deb", "application/octet-stream"}.
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{".dmg", "application/octet-stream"}.
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{".fs", "application/octet-stream"}.
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{".iso", "application/octet-stream"}.
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{".img", "application/octet-stream"}.
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{".msi", "application/octet-stream"}.
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{".msp", "application/octet-stream"}.
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{".msm", "application/octet-stream"}.
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{".pdf", "application/pdf"}.
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{".ps", "application/postscript"}.
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{".eps", "application/postscript"}.
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{".ai", "application/postscript"}.
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{".rss", "application/rss+xml"}.
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{".rtf", "application/rtf"}.
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{".m3u8", "application/vnd.apple.mpegurl"}.
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{".kml", "application/vnd.google-earth.kml+xml"}.
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{".kmz", "application/vnd.google-earth.kmz"}.
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{".xls", "application/vnd.ms-excel"}.
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{".eot", "application/vnd.ms-fontobject"}.
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{".ppt", "application/vnd.ms-powerpoint"}.
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{".odc", "application/vnd.oasis.opendocument.chart"}.
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{".otc", "application/vnd.oasis.opendocument.chart-template"}.
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{".odb", "application/vnd.oasis.opendocument.database"}.
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{".odf", "application/vnd.oasis.opendocument.formula"}.
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{".otf", "application/vnd.oasis.opendocument.formula-template"}.
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{".odg", "application/vnd.oasis.opendocument.graphics"}.
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{".otg", "application/vnd.oasis.opendocument.graphics-template"}.
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{".odi", "application/vnd.oasis.opendocument.image"}.
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{".oti", "application/vnd.oasis.opendocument.image-template"}.
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{".odp", "application/vnd.oasis.opendocument.presentation"}.
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{".otp", "application/vnd.oasis.opendocument.presentation-template"}.
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{".ods", "application/vnd.oasis.opendocument.spreadsheet"}.
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{".ots", "application/vnd.oasis.opendocument.spreadsheet-template"}.
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{".odt", "application/vnd.oasis.opendocument.text"}.
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{".odm", "application/vnd.oasis.opendocument.text-master"}.
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{".ott", "application/vnd.oasis.opendocument.text-template"}.
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{".oth", "application/vnd.oasis.opendocument.text-web"}.
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{".wmlc", "application/vnd.wap.wmlc"}.
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{".7z", "application/x-7z-compressed"}.
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{".cco", "application/x-cocoa"}.
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{".jardiff", "application/x-java-archive-diff"}.
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{".jnlp", "application/x-java-jnlp-file"}.
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{".run", "application/x-makeself"}.
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{".pac", "application/x-ns-proxy-autoconfig"}.
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{".pl", "application/x-perl"}.
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{".pm", "application/x-perl"}.
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{".prc", "application/x-pilot"}.
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{".pdb", "application/x-pilot"}.
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{".rar", "application/x-rar-compressed"}.
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{".rpm", "application/x-redhat-package-manager"}.
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{".sea", "application/x-sea"}.
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{".swf", "application/x-shockwave-flash"}.
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{".sit", "application/x-stuffit"}.
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{".tcl", "application/x-tcl"}.
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{".tk", "application/x-tcl"}.
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{".der", "application/x-x509-ca-cert"}.
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{".pem", "application/x-x509-ca-cert"}.
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{".crt", "application/x-x509-ca-cert"}.
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{".xpi", "application/x-xpinstall"}.
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{".xhtml", "application/xhtml+xml"}.
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{".zip", "application/zip"}.
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{".ez", "application/zip"}.
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{".au", "audio/basic"}.
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{".snd", "audio/basic"}.
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{".mid", "audio/midi"}.
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{".midi", "audio/midi"}.
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{".kar", "audio/midi"}.
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{".mp3", "audio/mpeg"}.
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{".ogg", "audio/ogg"}.
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{".m4a", "audio/x-m4a"}.
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{".ra", "audio/x-realaudio"}.
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{".gif", "image/gif"}.
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{".jpeg", "image/jpeg"}.
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{".jpg", "image/jpeg"}.
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{".png", "image/png"}.
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{".svg", "image/svg+xml"}.
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{".svgz", "image/svg+xml"}.
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{".tif", "image/tiff"}.
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{".tiff", "image/tiff"}.
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{".wbmp", "image/vnd.wap.wbmp"}.
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{".webp", "image/webp"}.
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{".ico", "image/x-icon"}.
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{".jng", "image/x-jng"}.
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{".bmp", "image/x-ms-bmp"}.
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{".css", "text/css"}.
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{".html", "text/html"}.
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{".htm", "text/html"}.
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{".shtml", "text/html"}.
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{".mml", "text/mathml"}.
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{".txt", "text/plain"}.
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{".jad", "text/vnd.sun.j2me.app-descriptor"}.
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{".wml", "text/vnd.wap.wml"}.
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{".htc", "text/x-component"}.
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{".xml", "text/xml"}.
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{".3gpp", "video/3gpp"}.
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{".3gp", "video/3gpp"}.
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{".ts", "video/mp2t"}.
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{".mp4", "video/mp4"}.
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{".mpeg", "video/mpeg"}.
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{".mpg", "video/mpeg"}.
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{".mov", "video/quicktime"}.
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{".webm", "video/webm"}.
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{".flv", "video/x-flv"}.
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{".m4v", "video/x-m4v"}.
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{".mkv", "video/x-matroska"}.
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{".mng", "video/x-mng"}.
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{".asx", "video/x-ms-asf"}.
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{".asf", "video/x-ms-asf"}.
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{".wmv", "video/x-ms-wmv"}.
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{".avi", "video/x-msvideo"}.
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@ -0,0 +1,19 @@
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.PHONY: all
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.SUFFIXES: .erl .beam
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ERLC?= erlc -server
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ERLOPTS+= -I ../include
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OBJS= storage.beam storage_app.beam
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OBJS+= storage_supervisor.beam
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all: ${OBJS}
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.erl.beam:
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${ERLC} ${ERLOPTS} ${ERLFLAGS} $<
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clean:
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rm -f *.beam
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@ -0,0 +1,820 @@
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%
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% Copyright (c) 2024 Andrea Biscuola <a@abiscuola.com>
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%
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% Permission to use, copy, modify, and distribute this software for any
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% purpose with or without fee is hereby granted, provided that the above
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% copyright notice and this permission notice appear in all copies.
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%
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|
% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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|
% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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%
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-module(storage).
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-moduledoc """
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Object storage module
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This module provide functions to interact with the storage application.
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Functionalities includes reading and writing records, creating and
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deleting buckets and managing their size and replication across a
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cluster.
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Objects stored in a bucket are defined as:
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```
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-record(object, {key :: term(),
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value :: term(),
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tags = [] :: list(term()),
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metadata = [] :: list({term(), term()})}).
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```
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To import the object definition in your module, include the "storage.hrl"
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file:
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```
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-include_lib("storage/include/storage.hrl").
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```
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""".
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-behaviour(gen_server).
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% Server start function
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-export([start_link/0]).
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% Public bucket operation functions
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-export([add_node/1, add_replica/2, add_replica/3,
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create/1, create/2, create/3,
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delete_replica/2, grow/1, grow/2, grow/3,
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move/3, remove/1, remove/2, shrink/1,
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shrink/2]).
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% Public record operation functions
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-export([delete/2, list/2, read/2, write/3, write/4]).
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% Module callbacks
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-export([code_change/3,
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init/1,
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handle_call/3,
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handle_cast/2,
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handle_info/2,
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terminate/2]).
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-include_lib("stdlib/include/qlc.hrl").
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-include_lib("storage/include/storage.hrl").
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-define(MIMEFILE, "/mimes.txt").
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-define(DEFMIME, "application/octect-stream").
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-type object() :: #object{}.
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-type metadata() :: [{atom(), term()}].
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-export_type([object/0, metadata/0]).
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-record(mime, {ext, mtype}).
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%
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% Start functions.
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%
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start_link() ->
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gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
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%
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% Buckets management functions.
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%
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-doc """
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Add a node to the storage cluster.
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Spec:
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```
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-spec add_node(Node) -> ok | {error, Reason} when
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Node :: atom(),
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Reason :: term().
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```
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Example:
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```
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add_node('b@piwa').
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ok
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```
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Bootstrap and add the node `b@piwa` to the storage cluster.
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""".
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-spec add_node(Node) -> ok | {error, Reason} when
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Node :: atom(),
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Reason :: term().
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add_node(Node) ->
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gen_server:call(?MODULE, {node, Node}).
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-doc """
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Create a replica of the given `Bucket` on `Node`.
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Spec:
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```
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-spec add_replica(Bucket, Node, Type) -> ok | {error, Reason} when
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Bucket :: atom(),
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Node :: atom(),
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Type :: disc_copies | disc_only_copies | ram_copies,
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Reason :: term().
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```
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`Type` determines the kind of replica the destination node will manage,
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be it on disc, RAM, or both. The possible values for `Type` means:
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- ram_copies: the replica will be kept only in RAM on the destination node.
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- disc_copies: the replica will be in RAM and also on disc.
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- disc_only_copies: the replica will reside on disc only.
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|
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Example:
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|
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Add a disk-only replica of the bucket "objects", on the node "pri@lab":
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```
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add_replica(objects, 'pri@lab', disc_only_copies).
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ok
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|
```
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||||||
|
""".
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-spec add_replica(Bucket, Node, Type) -> ok | {error, Reason} when
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Bucket :: atom(),
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Node :: atom(),
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Type :: disc_copies | disc_only_copies | ram_copies,
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Reason :: term().
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add_replica(Bucket, Node, Type) ->
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gen_server:call(?MODULE, {replica, Bucket, Node, Type}).
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|
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-doc """
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|
Same as:
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|
|
||||||
|
```
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add_replica(Bucket, Node, disc_only_copies).
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|
```
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||||||
|
""".
|
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-spec add_replica(Bucket, Node) -> ok | {error, Reason} when
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|
Bucket :: atom(),
|
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|
Node :: atom(),
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|
Reason :: term().
|
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|
|
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add_replica(Bucket, Node) ->
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gen_server:call(?MODULE, {replica, Bucket, Node, disc_only_copies}).
|
||||||
|
|
||||||
|
-doc """
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|
Same as
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|
|
||||||
|
```
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||||||
|
create(Bucket, [node()], disc_only_copies).
|
||||||
|
```
|
||||||
|
""".
|
||||||
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-spec create(Bucket) -> ok | {error, Reason} when
|
||||||
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Bucket :: atom(),
|
||||||
|
Reason :: term().
|
||||||
|
|
||||||
|
create(Bucket) ->
|
||||||
|
gen_server:call(?MODULE, {create, Bucket, [node()], disc_only_copies}).
|
||||||
|
|
||||||
|
-doc """
|
||||||
|
Same as
|
||||||
|
|
||||||
|
```
|
||||||
|
create(Bucket, Nodes, disc_only_copies).
|
||||||
|
```
|
||||||
|
""".
|
||||||
|
-spec create(Bucket, Nodes) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Nodes :: [atom()],
|
||||||
|
Reason :: term().
|
||||||
|
|
||||||
|
create(Bucket, Nodes) ->
|
||||||
|
gen_server:call(?MODULE, {create, Bucket, Nodes, disc_only_copies}).
|
||||||
|
|
||||||
|
-doc """
|
||||||
|
Create a new `Bucket` on the specified list of `Nodes`.
|
||||||
|
|
||||||
|
Spec:
|
||||||
|
|
||||||
|
```
|
||||||
|
-spec create(Bucket, Nodes, Type) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Nodes :: [atom()],
|
||||||
|
Type :: ram_copies | disc_copies | disc_only_copies,
|
||||||
|
Reason :: term().
|
||||||
|
```
|
||||||
|
|
||||||
|
The possible values for `Type` means:
|
||||||
|
|
||||||
|
- ram_copies: all the bucket copies will be kept only in RAM
|
||||||
|
- disc_copies: all the bucket copies will be kept in RAM and also on disc.
|
||||||
|
- disc_only_copies: all the bucket copies will be kept on disc only.
|
||||||
|
|
||||||
|
The bucket will be created with the default size of 2GB, and a replica
|
||||||
|
will be setup between the given nodes.
|
||||||
|
|
||||||
|
Example:
|
||||||
|
|
||||||
|
```
|
||||||
|
create(objects, ['lab1@pri', 'lab2@sec'], disc_only_copies).
|
||||||
|
ok
|
||||||
|
```
|
||||||
|
|
||||||
|
Creates the bucket "objects", of 2GB, on 'lab1@pri' and setup a replica
|
||||||
|
on 'lab2@sec'. Both the copies will be on disk only.
|
||||||
|
|
||||||
|
If you have different needs, create a single bucket instance and then
|
||||||
|
add replicas of it calling the `add_replica/3` function.
|
||||||
|
""".
|
||||||
|
-spec create(Bucket, Nodes, Type) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Nodes :: [atom()],
|
||||||
|
Type :: ram_copies | disc_copies | disc_only_copies,
|
||||||
|
Reason :: term().
|
||||||
|
|
||||||
|
create(Bucket, Nodes, Type) ->
|
||||||
|
gen_server:call(?MODULE, {create, Bucket, Nodes, Type}).
|
||||||
|
|
||||||
|
-doc """
|
||||||
|
Delete a bucket replica.
|
||||||
|
|
||||||
|
Spec:
|
||||||
|
|
||||||
|
```
|
||||||
|
-spec delete_replica(Bucket, Node) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Node :: atom(),
|
||||||
|
Reason :: term().
|
||||||
|
```
|
||||||
|
|
||||||
|
Delete the `Bucket` replica from the given `Node`.
|
||||||
|
""".
|
||||||
|
-spec delete_replica(Bucket, Node) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Node :: atom(),
|
||||||
|
Reason :: term().
|
||||||
|
|
||||||
|
delete_replica(Bucket, Node) ->
|
||||||
|
gen_server:call(?MODULE, {delete_replica, Bucket, Node}).
|
||||||
|
|
||||||
|
-doc """
|
||||||
|
Same as:
|
||||||
|
|
||||||
|
```
|
||||||
|
grow(Bucket, [node()], 1).
|
||||||
|
```
|
||||||
|
""".
|
||||||
|
-spec grow(Bucket) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Reason :: term().
|
||||||
|
|
||||||
|
grow(Bucket) ->
|
||||||
|
gen_server:call(?MODULE, {grow, Bucket, [node()], 1}).
|
||||||
|
|
||||||
|
-doc """
|
||||||
|
Same as:
|
||||||
|
|
||||||
|
```
|
||||||
|
grow(Bucket, Nodes, 1).
|
||||||
|
```
|
||||||
|
""".
|
||||||
|
-spec grow(Bucket, Nodes) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Nodes :: [atom()],
|
||||||
|
Reason :: term().
|
||||||
|
|
||||||
|
grow(Bucket, Nodes) ->
|
||||||
|
gen_server:call(?MODULE, {grow, Bucket, Nodes, 1}).
|
||||||
|
|
||||||
|
-doc """
|
||||||
|
Add additional partitions to a bucket.
|
||||||
|
|
||||||
|
Spec:
|
||||||
|
|
||||||
|
```
|
||||||
|
-spec grow(Bucket, Nodes, Num) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Nodes :: [atom()],
|
||||||
|
Num :: pos_integer(),
|
||||||
|
Reason :: term().
|
||||||
|
```
|
||||||
|
|
||||||
|
`Num` is the number of partitions to add to theexisting `Bucket`. Every
|
||||||
|
added partition, will increase the bucket size by 2GB.
|
||||||
|
That is, the total size increase of the bucket will be `Num` * 2GB.
|
||||||
|
|
||||||
|
The created partitions are going to be replicated on the given list of `Nodes`,
|
||||||
|
with priority given to nodes based on the order of the list.
|
||||||
|
|
||||||
|
Example:
|
||||||
|
|
||||||
|
Assuming the "objects" bucket exists:
|
||||||
|
|
||||||
|
```
|
||||||
|
grow(objects, ['lab1@pri', 'lab2@sec'], 4]).
|
||||||
|
ok
|
||||||
|
```
|
||||||
|
|
||||||
|
Adds 4 new partitions to the "objects" bucket, on 'lab1@pri', replicating
|
||||||
|
them on 'lab2@sec' with a total size increase of 4 * 2GB = 8GB.
|
||||||
|
""".
|
||||||
|
-spec grow(Bucket, Nodes, Num) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Nodes :: [atom()],
|
||||||
|
Num :: pos_integer(),
|
||||||
|
Reason :: term().
|
||||||
|
|
||||||
|
grow(Bucket, Nodes, Num) ->
|
||||||
|
gen_server:call(?MODULE, {grow, Bucket, Nodes, Num}).
|
||||||
|
|
||||||
|
-doc """
|
||||||
|
Move a bucket replica copy between nodes.
|
||||||
|
|
||||||
|
Spec:
|
||||||
|
|
||||||
|
```
|
||||||
|
-spec move(Bucket, Source, Dest) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Source :: atom(),
|
||||||
|
Dest :: atom(),
|
||||||
|
Reason :: term().
|
||||||
|
```
|
||||||
|
|
||||||
|
The copy of `Bucket` living on `Source`, will be moved to `Dest` and deleted
|
||||||
|
from the source node once the operation is completed.
|
||||||
|
""".
|
||||||
|
-spec move(Bucket, Source, Dest) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Source :: atom(),
|
||||||
|
Dest :: atom(),
|
||||||
|
Reason :: term().
|
||||||
|
|
||||||
|
move(Bucket, Source, Dest) ->
|
||||||
|
gen_server:call(?MODULE, {move, Bucket, Source, Dest}).
|
||||||
|
|
||||||
|
-doc """
|
||||||
|
Delete the given `Bucket` and all it's replicas.
|
||||||
|
|
||||||
|
Spec:
|
||||||
|
|
||||||
|
```
|
||||||
|
-spec remove(Bucket) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Reason :: term().
|
||||||
|
```
|
||||||
|
""".
|
||||||
|
-spec remove(Bucket) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Reason :: term().
|
||||||
|
|
||||||
|
remove(Bucket) ->
|
||||||
|
gen_server:call(?MODULE, {remove, Bucket}).
|
||||||
|
|
||||||
|
-doc """
|
||||||
|
Delete the replica of the given `Bucket` from Node.
|
||||||
|
|
||||||
|
Spec:
|
||||||
|
|
||||||
|
```
|
||||||
|
-spec remove(Bucket, Node) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Node :: atom(),
|
||||||
|
Reason :: term().
|
||||||
|
```
|
||||||
|
""".
|
||||||
|
-spec remove(Bucket, Node) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Node :: atom(),
|
||||||
|
Reason :: term().
|
||||||
|
|
||||||
|
remove(Bucket, Node) ->
|
||||||
|
gen_server:call(?MODULE, {remove, Bucket, Node}).
|
||||||
|
|
||||||
|
-doc """
|
||||||
|
Same as:
|
||||||
|
|
||||||
|
```
|
||||||
|
shrink(Bucket, 1).
|
||||||
|
""".
|
||||||
|
-spec shrink(Bucket) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Reason :: term().
|
||||||
|
|
||||||
|
shrink(Bucket) ->
|
||||||
|
gen_server:call(?MODULE, {shrink, Bucket, 1}).
|
||||||
|
|
||||||
|
-doc """
|
||||||
|
Delete bucket partitions.
|
||||||
|
|
||||||
|
Spec:
|
||||||
|
|
||||||
|
```
|
||||||
|
-spec shrink(Bucket, Num) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Num :: pos_integer(),
|
||||||
|
Reason :: term().
|
||||||
|
```
|
||||||
|
|
||||||
|
Remove `Num` partitions from the given `Bucket`. Objects stored
|
||||||
|
on the deleted partitions are moved to the remaining ones automatically.
|
||||||
|
|
||||||
|
Removing partitions will shrink the total bucket size of 2GB * `Num`.
|
||||||
|
|
||||||
|
Example:
|
||||||
|
|
||||||
|
```
|
||||||
|
shrink(objects, 6).
|
||||||
|
ok
|
||||||
|
```
|
||||||
|
|
||||||
|
Removes 6 partitions from the "objects" bucket, reducing it's size by
|
||||||
|
2GB * 6 = 12GB.
|
||||||
|
""".
|
||||||
|
-spec shrink(Bucket, Num) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Num :: pos_integer(),
|
||||||
|
Reason :: term().
|
||||||
|
|
||||||
|
shrink(Bucket, Num) ->
|
||||||
|
gen_server:call(?MODULE, {shrink, Bucket, Num}).
|
||||||
|
|
||||||
|
%
|
||||||
|
% Record operation functions.
|
||||||
|
%
|
||||||
|
|
||||||
|
-doc """
|
||||||
|
Delete an object from a bucket.
|
||||||
|
|
||||||
|
Spec:
|
||||||
|
|
||||||
|
```
|
||||||
|
-spec delete(Bucket, Key) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Key :: term(),
|
||||||
|
Reason :: term().
|
||||||
|
```
|
||||||
|
|
||||||
|
""".
|
||||||
|
-spec delete(Bucket, Key) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Key :: term(),
|
||||||
|
Reason :: term().
|
||||||
|
|
||||||
|
delete(Bucket, Key) ->
|
||||||
|
gen_server:call(?MODULE, {delete, Bucket, Key}).
|
||||||
|
|
||||||
|
-doc """
|
||||||
|
Spec:
|
||||||
|
|
||||||
|
```
|
||||||
|
-spec list(Bucket, Metadata) -> {ok, Records} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Metadata :: metadata(),
|
||||||
|
Records :: [object()].
|
||||||
|
```
|
||||||
|
Read a list of objects from a bucket.
|
||||||
|
|
||||||
|
Returned objects are the ones tagged with `all` the tags in the tags
|
||||||
|
list of it's metadata field.
|
||||||
|
|
||||||
|
Example:
|
||||||
|
|
||||||
|
```
|
||||||
|
{ok, Objs} = list(objects, [{tags, [foo, bar]}]).
|
||||||
|
Objs.
|
||||||
|
[#object{key = o1,
|
||||||
|
tags = [foo, bar],
|
||||||
|
value = {ipse, dixit},
|
||||||
|
metadata = [{tags, [foo, bar]},{mime, 'application/octect-stream'}]
|
||||||
|
}, #object{key = o2,
|
||||||
|
tags = [foo, bar],
|
||||||
|
value = 42,
|
||||||
|
metadata = [{tags, [foo, bar]},{mime, 'application/octect-stream'}]
|
||||||
|
}
|
||||||
|
]
|
||||||
|
|
||||||
|
""".
|
||||||
|
-spec list(Bucket, Metadata) -> {ok, Records} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Metadata :: metadata(),
|
||||||
|
Records :: [object()].
|
||||||
|
|
||||||
|
list(Bucket, Metadata) ->
|
||||||
|
gen_server:call(?MODULE, {list, Bucket, Metadata}).
|
||||||
|
|
||||||
|
-doc """
|
||||||
|
Read an object from a bucket.
|
||||||
|
|
||||||
|
Spec:
|
||||||
|
|
||||||
|
```
|
||||||
|
-spec read(Bucket, Key) -> {ok, Record} | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Key :: term(),
|
||||||
|
Record :: [object()],
|
||||||
|
Reason :: term().
|
||||||
|
```
|
||||||
|
|
||||||
|
Example:
|
||||||
|
|
||||||
|
```
|
||||||
|
{ok, [R]} = read(objects, foo).
|
||||||
|
R.
|
||||||
|
#object{key = o1,value = {ipse, dixit},
|
||||||
|
metadata = [{tags, [foo, bar]},{mime, 'application/octet-stream'}]}
|
||||||
|
```
|
||||||
|
""".
|
||||||
|
-spec read(Bucket, Key) -> {ok, Record} | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Key :: term(),
|
||||||
|
Record :: [object()],
|
||||||
|
Reason :: term().
|
||||||
|
|
||||||
|
read(Bucket, Key) ->
|
||||||
|
gen_server:call(?MODULE, {read, Bucket, Key}).
|
||||||
|
|
||||||
|
-doc """
|
||||||
|
Same as:
|
||||||
|
|
||||||
|
```
|
||||||
|
write(Bucket, Key, Term, []).
|
||||||
|
```
|
||||||
|
|
||||||
|
""".
|
||||||
|
-spec write(Bucket, Key, Term) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Key :: term(),
|
||||||
|
Term :: term(),
|
||||||
|
Reason :: term().
|
||||||
|
|
||||||
|
write(Bucket, Key, Term) ->
|
||||||
|
gen_server:call(?MODULE, {write, Bucket, Key, Term}).
|
||||||
|
|
||||||
|
-doc """
|
||||||
|
Store an object in a provided bucket.
|
||||||
|
|
||||||
|
Spec:
|
||||||
|
|
||||||
|
```
|
||||||
|
-spec write(Bucket, Key, Term, Metadata) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Key :: term(),
|
||||||
|
Term :: term(),
|
||||||
|
Metadata :: metadata(),
|
||||||
|
Reason :: term().
|
||||||
|
```
|
||||||
|
|
||||||
|
Store an object identified by `Key` with value `Term` in `Bucket`. The
|
||||||
|
key must be unique and writing an object with the same key as an
|
||||||
|
existing one will cause an update of the existing object.
|
||||||
|
|
||||||
|
`Metadata` represent additional data attached to the stored object,
|
||||||
|
useful when later searching for objects using `list/2`.
|
||||||
|
|
||||||
|
Example:
|
||||||
|
|
||||||
|
```
|
||||||
|
write(objects, hello, world, [{tags, [blog, post]}]).
|
||||||
|
ok
|
||||||
|
```
|
||||||
|
|
||||||
|
Store an object identified by the key "hello" in the "objects" bucket,
|
||||||
|
tagged with the atoms `blog` and `post` in it's metadata.
|
||||||
|
""".
|
||||||
|
-spec write(Bucket, Key, Term, Metadata) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Key :: term(),
|
||||||
|
Term :: term(),
|
||||||
|
Metadata :: metadata(),
|
||||||
|
Reason :: term().
|
||||||
|
|
||||||
|
write(Bucket, Key, Term, Metadata) ->
|
||||||
|
gen_server:call(?MODULE, {write, Bucket, Key, Term, Metadata}).
|
||||||
|
|
||||||
|
%
|
||||||
|
% Module callbacks.
|
||||||
|
%
|
||||||
|
|
||||||
|
code_change(_OldVsn, N, _Extra) -> {ok, N}.
|
||||||
|
|
||||||
|
init([]) ->
|
||||||
|
process_flag(trap_exit, true),
|
||||||
|
|
||||||
|
mnesia:create_table(mime, [{attributes, record_info(fields, mime)},
|
||||||
|
{ram_copies, [node()]}, {local_content, true}]),
|
||||||
|
|
||||||
|
F= fun() ->
|
||||||
|
{ok, App} = application:get_application(?MODULE),
|
||||||
|
{ok, M} = file:consult(lists:append(code:priv_dir(App), ?MIMEFILE)),
|
||||||
|
|
||||||
|
[mnesia:write(#mime{ext = E, mtype = T}) || {E, T} <- M]
|
||||||
|
end,
|
||||||
|
|
||||||
|
mnesia:transaction(F),
|
||||||
|
|
||||||
|
{ok, 0}.
|
||||||
|
|
||||||
|
terminate(_Reason, _N) ->
|
||||||
|
mnesia:delete_table(mime),
|
||||||
|
ok.
|
||||||
|
|
||||||
|
%
|
||||||
|
% Bucket operations callbacks.
|
||||||
|
%
|
||||||
|
|
||||||
|
handle_call({node, Node}, _From, State) ->
|
||||||
|
ok = rpc:call(Node, mnesia, start, []),
|
||||||
|
{ok, _} = mnesia:change_config(extra_db_nodes, [Node]),
|
||||||
|
case mnesia:change_table_copy_type(schema, Node, disc_copies) of
|
||||||
|
{atomic, ok} -> {reply, ok, State};
|
||||||
|
{aborted, Reason} -> {reply, {error, Reason}, State}
|
||||||
|
end;
|
||||||
|
|
||||||
|
handle_call({create, Bucket, Nodes, Type}, _From, State) ->
|
||||||
|
mnesia:create_table(Bucket, [{attributes, record_info(fields, object)},
|
||||||
|
{Type, Nodes}, {record_name, object}]),
|
||||||
|
|
||||||
|
case mnesia:change_table_frag(Bucket, {activate, []}) of
|
||||||
|
{atomic, ok} -> {reply, ok, State};
|
||||||
|
{aborted, Reason} -> {reply, {error, Reason}, State}
|
||||||
|
end;
|
||||||
|
|
||||||
|
handle_call({delete_replica, Bucket, Node}, _From, State) ->
|
||||||
|
case mnesia:del_table_copy(Bucket, Node) of
|
||||||
|
{atomic, _} -> {reply, ok, State};
|
||||||
|
{aborted, Reason} -> {reply, {error, Reason}, State}
|
||||||
|
end;
|
||||||
|
|
||||||
|
handle_call({grow, Bucket, Nodes, Num}, _From, State) ->
|
||||||
|
case grow_bucket(Bucket, Nodes, Num) of
|
||||||
|
ok -> {reply, ok, State};
|
||||||
|
{error, Reason} -> {reply, {error, Reason}, State}
|
||||||
|
end;
|
||||||
|
|
||||||
|
handle_call({move, Bucket, Source, Dest}, _From, State) ->
|
||||||
|
case mnesia:move_table_copy(Bucket, Source, Dest) of
|
||||||
|
{atomic, ok} -> {reply, ok, State};
|
||||||
|
{aborted, Reason} -> {reply, {error, Reason}, State}
|
||||||
|
end;
|
||||||
|
|
||||||
|
handle_call({remove, Bucket}, _From, State) ->
|
||||||
|
case mnesia:delete_table(Bucket) of
|
||||||
|
{atomic, ok} -> {reply, ok, State};
|
||||||
|
{aborted, Reason} -> {reply, {error, Reason}, State}
|
||||||
|
end;
|
||||||
|
|
||||||
|
handle_call({remove, Bucket, Node}, _From, State) ->
|
||||||
|
case mnesia:del_table_copy(Bucket, Node) of
|
||||||
|
{atomic, ok} -> {reply, ok, State};
|
||||||
|
{aborted, Reason} -> {reply, {error, Reason}, State}
|
||||||
|
end;
|
||||||
|
|
||||||
|
handle_call({replica, Bucket, Node, Type}, _From, State) ->
|
||||||
|
case mnesia:add_table_copy(Bucket, Node, Type) of
|
||||||
|
{atomic, _} -> {reply, ok, State};
|
||||||
|
{aborted, Reason} -> {reply, {error, Reason}, State}
|
||||||
|
end;
|
||||||
|
|
||||||
|
handle_call({shrink, Bucket, Num}, _From, State) ->
|
||||||
|
case shrink_bucket(Bucket, Num) of
|
||||||
|
ok -> {reply, ok, State};
|
||||||
|
{error, Reason} -> {reply, {error, Reason}, State}
|
||||||
|
end;
|
||||||
|
|
||||||
|
%
|
||||||
|
% Record operation callbacks.
|
||||||
|
%
|
||||||
|
|
||||||
|
%
|
||||||
|
% Read callbacks.
|
||||||
|
%
|
||||||
|
|
||||||
|
handle_call({list, Bucket, Metadata}, _From, State) ->
|
||||||
|
case search(Bucket, Metadata) of
|
||||||
|
{ok, Records} -> {reply, {ok, Records}, State};
|
||||||
|
{error, Reason} -> {reply, {error, Reason}, State}
|
||||||
|
end;
|
||||||
|
|
||||||
|
handle_call({read, Bucket, Key}, _From, State) ->
|
||||||
|
F = fun() ->
|
||||||
|
mnesia:read(Bucket, Key)
|
||||||
|
end,
|
||||||
|
|
||||||
|
case mnesia:transaction(F) of
|
||||||
|
{atomic, R} -> {reply, {ok, R}, State};
|
||||||
|
{aborted, Reason} -> {reply, {error, Reason}, State}
|
||||||
|
end;
|
||||||
|
|
||||||
|
%
|
||||||
|
% Write callbacks.
|
||||||
|
%
|
||||||
|
|
||||||
|
handle_call({delete, Bucket, Key}, _From, State) ->
|
||||||
|
F = fun() ->
|
||||||
|
mnesia:delete({Bucket, Key})
|
||||||
|
end,
|
||||||
|
|
||||||
|
case mnesia:transaction(F) of
|
||||||
|
{atomic, ok} -> {reply, ok, State};
|
||||||
|
{aborted, Reason} -> {reply, {error, Reason}, State}
|
||||||
|
end;
|
||||||
|
|
||||||
|
handle_call({write, Bucket, Key, Term}, _From, State) ->
|
||||||
|
handle_call({write, Bucket, Key, Term, []}, _From, State);
|
||||||
|
|
||||||
|
handle_call({write, Bucket, Key, Term, Metadata}, _From, State) ->
|
||||||
|
Ex = filename:extension(Key),
|
||||||
|
|
||||||
|
F = fun() ->
|
||||||
|
M = case mnesia:read(mime, Ex) of
|
||||||
|
[] -> ?DEFMIME;
|
||||||
|
[Mt] -> Mt#mime.mtype
|
||||||
|
end,
|
||||||
|
|
||||||
|
R = #object{key = Key, value = Term, metadata = lists:flatten([{mime, M}, Metadata])},
|
||||||
|
mnesia:write(Bucket, R, write)
|
||||||
|
end,
|
||||||
|
|
||||||
|
case mnesia:transaction(F) of
|
||||||
|
{atomic, _} -> {reply, ok, State};
|
||||||
|
{aborted, Reason} -> {reply, {error, Reason}, State}
|
||||||
|
end.
|
||||||
|
|
||||||
|
handle_cast(_Msg, State) -> {noreply, State}.
|
||||||
|
|
||||||
|
handle_info(_Info, State) -> {noreply, State}.
|
||||||
|
|
||||||
|
%
|
||||||
|
% Private functions.
|
||||||
|
%
|
||||||
|
|
||||||
|
-spec grow_bucket(Bucket, Nodes, Num) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Nodes :: [atom()],
|
||||||
|
Num :: pos_integer(),
|
||||||
|
Reason :: term().
|
||||||
|
|
||||||
|
grow_bucket(_Bucket, _Nodes, 0) -> ok;
|
||||||
|
grow_bucket(Bucket, Nodes, Num) when is_integer(Num) ->
|
||||||
|
case mnesia:change_table_frag(Bucket, {add_frag, Nodes}) of
|
||||||
|
{atomic, ok} ->
|
||||||
|
grow_bucket(Bucket, Nodes, Num - 1);
|
||||||
|
{aborted, Reason} ->
|
||||||
|
{error, Reason}
|
||||||
|
end.
|
||||||
|
|
||||||
|
-spec shrink_bucket(Bucket, Num) -> ok | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Num :: pos_integer(),
|
||||||
|
Reason :: term().
|
||||||
|
|
||||||
|
shrink_bucket(_Bucket, 0) -> ok;
|
||||||
|
shrink_bucket(Bucket, Num) when is_integer(Num) ->
|
||||||
|
case mnesia:change_table_frag(Bucket, del_frag) of
|
||||||
|
{atomic, ok} ->
|
||||||
|
shrink_bucket(Bucket, Num - 1);
|
||||||
|
{aborted, Reason} ->
|
||||||
|
{error, Reason}
|
||||||
|
end.
|
||||||
|
|
||||||
|
-spec search(Bucket, Metadata) -> {ok, Objects} | {error, Reason} when
|
||||||
|
Bucket :: atom(),
|
||||||
|
Metadata :: metadata(),
|
||||||
|
Objects :: [object()],
|
||||||
|
Reason :: term().
|
||||||
|
|
||||||
|
search(Bucket, Metadata) ->
|
||||||
|
Q = qlc:q([X || X <- mnesia:table(Bucket), filter(Metadata, X#object.metadata)]),
|
||||||
|
|
||||||
|
F = fun() ->
|
||||||
|
qlc:e(Q)
|
||||||
|
end,
|
||||||
|
|
||||||
|
case mnesia:transaction(F) of
|
||||||
|
{atomic, L} -> {ok, L};
|
||||||
|
{aborted, Reason} -> {error, Reason}
|
||||||
|
end.
|
||||||
|
|
||||||
|
%
|
||||||
|
% A record is reported if and only if it contains all the key-value
|
||||||
|
% pairs passed in the M list.
|
||||||
|
%
|
||||||
|
% As a nice side effect, passing an empty metadata list `[]`, return
|
||||||
|
% the record itself. Useful to list all ther records in a specific table.
|
||||||
|
%
|
||||||
|
filter([], _M) -> true;
|
||||||
|
filter([H | T], M) ->
|
||||||
|
{K, V} = H,
|
||||||
|
|
||||||
|
case lists:keyfind(K, 1, M) of
|
||||||
|
false -> false;
|
||||||
|
{_Key, Val} ->
|
||||||
|
if
|
||||||
|
Val =:= V -> filter(T, M);
|
||||||
|
true -> false
|
||||||
|
end
|
||||||
|
end.
|
||||||
|
|
@ -0,0 +1,25 @@
|
||||||
|
%
|
||||||
|
% Copyright (c) 2024 Andrea Biscuola <a@abiscuola.com>
|
||||||
|
%
|
||||||
|
% Permission to use, copy, modify, and distribute this software for any
|
||||||
|
% purpose with or without fee is hereby granted, provided that the above
|
||||||
|
% copyright notice and this permission notice appear in all copies.
|
||||||
|
%
|
||||||
|
% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
||||||
|
% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
||||||
|
% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
||||||
|
% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
||||||
|
% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
||||||
|
% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
||||||
|
% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
||||||
|
%
|
||||||
|
-module(storage_app).
|
||||||
|
-behaviour(application).
|
||||||
|
|
||||||
|
-export([start/2,
|
||||||
|
stop/1]).
|
||||||
|
|
||||||
|
start(_Type, StartArgs) ->
|
||||||
|
storage_supervisor:start_link(StartArgs).
|
||||||
|
|
||||||
|
stop(_State) -> ok.
|
||||||
|
|
@ -0,0 +1,31 @@
|
||||||
|
%
|
||||||
|
% Copyright (c) 2024 Andrea Biscuola <a@abiscuola.com>
|
||||||
|
%
|
||||||
|
% Permission to use, copy, modify, and distribute this software for any
|
||||||
|
% purpose with or without fee is hereby granted, provided that the above
|
||||||
|
% copyright notice and this permission notice appear in all copies.
|
||||||
|
%
|
||||||
|
% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
||||||
|
% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
||||||
|
% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
||||||
|
% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
||||||
|
% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
||||||
|
% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
||||||
|
% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
||||||
|
%
|
||||||
|
-module(storage_supervisor).
|
||||||
|
-behaviour(supervisor).
|
||||||
|
|
||||||
|
-export([start/0,
|
||||||
|
start_link/1,
|
||||||
|
init/1]).
|
||||||
|
|
||||||
|
start() ->
|
||||||
|
spawn(fun() -> supervisor:start_link({local, ?MODULE}, ?MODULE, _Arg = []) end).
|
||||||
|
|
||||||
|
start_link(Args) ->
|
||||||
|
supervisor:start_link({local, ?MODULE}, ?MODULE, Args).
|
||||||
|
|
||||||
|
init([]) ->
|
||||||
|
{ok, {{one_for_one, 3, 10}, [{tag1, {storage, start_link, []}, permanent,
|
||||||
|
10000, worker, [storage]}]}}.
|
||||||
Loading…
Reference in New Issue