From: Brian Warner Date: Fri, 9 Oct 2009 20:04:46 +0000 (-0700) Subject: webapi.txt: document t=set_children, other small edits X-Git-Tag: trac-4100~26 X-Git-Url: https://git.rkrishnan.org/%5B/%5D%20/uri/using.html?a=commitdiff_plain;h=f03e87d081ad56768bfafdb95f2e50d37bbdc78d;p=tahoe-lafs%2Ftahoe-lafs.git webapi.txt: document t=set_children, other small edits --- diff --git a/docs/frontends/webapi.txt b/docs/frontends/webapi.txt index 199e4b28..4bbd7541 100644 --- a/docs/frontends/webapi.txt +++ b/docs/frontends/webapi.txt @@ -284,7 +284,7 @@ Now that we know how to build URLs that refer to files and directories in a Tahoe virtual filesystem, what sorts of operations can we do with those URLs? This section contains a catalog of GET, PUT, DELETE, and POST operations that can be performed on these URLs. This set of operations are aimed at programs -that use HTTP to communicate with a Tahoe node. The next section describes +that use HTTP to communicate with a Tahoe node. A later section describes operations that are intended for web browsers. === Reading A File === @@ -440,16 +440,17 @@ GET /uri/$DIRCAP/[SUBDIRS../]FILENAME?t=json "linkcrtime": 1202777696.7564139, "linkmotime": 1202777696.7564139, } } } ], - "subdir": [ "dirnode", { - "rw_uri": rwuri, - "ro_uri": rouri, - "metadata": { - "ctime": 1202778102.7589991, - "mtime": 1202778111.2160511, - "tahoe": { - "linkcrtime": 1202777696.7564139, - "linkmotime": 1202777696.7564139, - } } } ] } } ] + "subdir": [ "dirnode", { + "rw_uri": rwuri, + "ro_uri": rouri, + "metadata": { + "ctime": 1202778102.7589991, + "mtime": 1202778111.2160511, + "tahoe": { + "linkcrtime": 1202777696.7564139, + "linkmotime": 1202777696.7564139, + } } } ] + } } ] In the above example, note how 'children' is a dictionary in which the keys are child names and the values depend upon whether the child is a file or a @@ -474,15 +475,15 @@ GET /uri/$DIRCAP/[SUBDIRS../]FILENAME?t=json Starting in Tahoe v1.4.0, the 'linkmotime'/'linkcrtime' keys in the 'tahoe' sub-dict are also populated. - The reason we added the new values in Tahoe v1.4.0 is that there is an - undocumented API (search the source code for 'set_children') which you can - use to overwrite the values of the 'mtime'/'ctime' pair, and this - set_children API is used by the "tahoe backup" command (both in Tahoe v1.3.0 - and in Tahoe v1.4.0) to set the 'mtime' and 'ctime' values when backing up - files from a local filesystem into the Tahoe filesystem. As of Tahoe v1.4.0, - the set_children API cannot be used to set anything under the 'tahoe' key of - the metadata dict -- if you include 'tahoe' keys in your 'metadata' arguments - then it will silently ignore those keys. + The reason we added the new values in Tahoe v1.4.0 is that there is a + "set_children" API (described below) which you can use to overwrite the + values of the 'mtime'/'ctime' pair, and this API is used by the "tahoe + backup" command (both in Tahoe v1.3.0 and in Tahoe v1.4.0) to set the + 'mtime' and 'ctime' values when backing up files from a local filesystem + into the Tahoe filesystem. As of Tahoe v1.4.0, the set_children API cannot + be used to set anything under the 'tahoe' key of the metadata dict -- if + you include 'tahoe' keys in your 'metadata' arguments then it will silently + ignore those keys. Therefore, if the 'tahoe' sub-dict is present, you can rely on the 'linkcrtime' and 'linkmotime' values therein to have the semantics described @@ -577,6 +578,39 @@ PUT /uri/$DIRCAP/[SUBDIRS../]CHILDNAME?t=uri "false", "f", and "0" are synonyms for "False", and the parameter is case-insensitive. +=== Adding multiple files or directories to a parent directory at once === + +POST /uri/$DIRCAP/[SUBDIRS..]?t=set_children + + This command adds multiple children to a directory in a single operation. + It reads the request body and interprets it as a JSON-encoded description + of the child names and read/write-caps that should be added. + + The body should be a JSON-encoded dictionary, in the same format as the + "children" value returned by the "GET /uri/$DIRCAP?t=json" operation + described above. In this format, each key is a child names, and the + corresponding value is a tuple of (type, childinfo). "type" is ignored, and + "childinfo" is a dictionary that contains "rw_uri", "ro_uri", and + "metadata" keys. You can take the output of "GET /uri/$DIRCAP1?t=json" and + use it as the input to "POST /uri/$DIRCAP2?t=set_children" to make DIR2 + look very much like DIR1. + + When the set_children request contains a child name that already exists in + the target directory, this command defaults to overwriting that child with + the new value (both child cap and metadata, but if the JSON data does not + contain a "metadata" key, the old child's metadata is preserved). The + command takes a boolean "overwrite=" query argument to control this + behavior. If you use "?t=set_children&overwrite=false", then an attempt to + replace an existing child will instead cause an error. + + Any "tahoe" key in the new child's "metadata" value is ignored. Any + existing "tahoe" metadata is preserved. The metadata["tahoe"] value is + reserved for metadata generated by the tahoe node itself. The only two keys + currently placed here are "linkcrtime" and "linkmotime". For details, see + the section above entitled "Get Information About A File Or Directory (as + JSON)", in the "About the metadata" subsection. + + === Deleting a File or Directory === DELETE /uri/$DIRCAP/[SUBDIRS../]CHILDNAME @@ -609,7 +643,9 @@ DELETE /uri/$DIRCAP/[SUBDIRS../]CHILDNAME This section describes the HTTP operations that provide support for humans running a web browser. Most of these operations use HTML forms that use POST -to drive the Tahoe node. +to drive the Tahoe node. This section is intended for HTML authors who want +to write web pages that contain forms and buttons which manipulate the Tahoe +filesystem. Note that for all POST operations, the arguments listed can be provided either as URL query arguments or as form body fields. URL query arguments are