CN110929194A - Abstract algorithm-based static resource file cache control method and system - Google Patents
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Abstract
The file name and the reference address of the static resource file are modified into a new name and a new reference address related to the summary information before a system application program is issued by calculating the summary information of the static resource file, so that a browser can load the latest resource after the application program is issued, and system errors caused by browser caching are prevented. While avoiding the disadvantages of existing solutions.
Description
Technical Field
The disclosure relates to the technical field related to computer technology, in particular to a static resource file cache control method and system based on an abstract algorithm.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In the information system with the B/S structure, a browser caches static resources, requested resource files are stored in a local file system of a user, and when the user accesses the same resource files again, the browser does not need to acquire data from a server, but directly reads the cache on the local files, so that the access of pages is accelerated. However, the versions of the browser are numerous, the caching mechanisms are different, and the latest file cannot be guaranteed to be obtained from the server. Meanwhile, different servers handle different caching mechanisms, and the latest resource file cannot be acquired under a specific condition of the browser, so that the system is abnormal in function.
The existing solution for browser caching includes:
1. and adding an instruction which is not cached in the corresponding header information of the server, thereby preventing the browser from caching the file.
2. The URL of the static resource file is changed, a random or time-based variable parameter is added, and the browser considers that a new resource is requested when the parameter changes, thereby obtaining the latest version.
3. And dynamically loading the resource of the latest version at the browser end through the script in cooperation with the version number of the version control tool.
The inventors have found that the above prior art solutions have problems in that:
1. adding an uncached instruction in the service response header can cause the browser to uncache under any condition, and even if the static resource file is not changed, the browser can request again, so that the loading time of the page and the network traffic load are increased.
2. The scheme can update files as required by changing the static resource URL and adding variable parameters, but when the files are updated, the browser can replace the old files, and when the HTML page and the resource files need to be updated simultaneously, errors can be caused by different updating sequences. Meanwhile, the individual browser clients regard the resource URLs with added parameters as dynamic resources, which results in the inability to cache and performance burden.
3. The method is characterized in that resources of the latest version are dynamically loaded at a browser end through the combination of a script and the version number of a version control tool, a special front-end script is required, and version management and a code version management tool are bound, so that if the version tool is switched, the conflict of the version number can be caused.
Disclosure of Invention
The method comprises the steps of calculating abstract information of the static resource file, modifying the file name and the reference address of the static resource file into a new name and a new reference address related to the abstract information before a system application program is released, and enabling a browser to load the latest resource after the application program is released so as to prevent system errors caused by browser caching. While avoiding the disadvantages of existing solutions.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
one or more embodiments provide a static resource file cache control method based on a summarization algorithm, including the following steps:
step 1, establishing a processed address lookup table for storing reference addresses of static resource files, and extracting reference files of the static resource files from application program deployment files to be issued;
step 2, matching and searching the contents of all the reference files according to the configured rules, and finding out all the static resource reference addresses needing to be processed in the reference files;
step 3, setting the static resource reference addresses to be processed as the reference addresses of the current to-be-processed static resource files in sequence, searching whether the reference addresses of the current to-be-processed static resource files exist in a processed address lookup table, if so, executing step 5, otherwise, executing the next step;
step 4, searching for the referenced static resource file according to the reference address of the current static resource file to be processed, calculating the MD5 value of the searched static resource file according to a summary algorithm, renaming the static resource file obtained by searching according to the MD5 value obtained by calculation to obtain a new file name, and adding a key value pair consisting of the address of the original file and the new address in a processed lookup table;
and 5, with the reference address of the current to-be-processed static resource file as a key, finding the address of the new file in the processed lookup table, updating the reference address in the reference file into the address of the new file, and updating the application program deployment file to be released.
A static resource file cache control system based on a summarization algorithm comprises:
a lookup table establishment module: the method comprises the steps of establishing a processed address lookup table used for storing reference addresses of static resource files;
the reference file extraction module: the reference file is used for extracting the static resource file from the application program deployment file to be issued;
the static resource reference address extraction module: the system comprises a configuration file, a processing module and a processing module, wherein the configuration file is used for matching and searching the contents of all reference files according to a configured rule and finding out all static resource reference addresses needing to be processed in the reference files;
a judging module: setting the static resource reference addresses to be processed as the reference addresses of the current to-be-processed static resource files in sequence, searching whether the reference addresses of the current to-be-processed static resource files exist in a processed address lookup table, and if so, turning to an updating module; otherwise, go to the renaming module of static resource file;
static resource file renaming module: searching for a referenced static resource file according to a reference address of a current static resource file to be processed, calculating an MD5 value of the searched static resource file according to a summary algorithm, renaming the static resource file obtained by searching according to an MD5 value obtained by calculation to obtain a new file name, and adding a key value pair consisting of an address of an original file and a new address in a processed lookup table;
an update module: and taking the reference address of the current to-be-processed static resource file as a key, finding the address of the new file in the processed lookup table, updating the reference address in the reference file into the address of the new file, and updating the application program deployment file to be released.
An electronic device comprising a memory and a processor and computer instructions stored on the memory and executed on the processor, the computer instructions, when executed by the processor, performing the steps of the above method.
A computer readable storage medium storing computer instructions which, when executed by a processor, perform the steps of the above method.
Compared with the prior art, the beneficial effect of this disclosure is:
(1) the method and the device make full use of the cache mechanism of the browser, and only when the content of the static resource file changes, the abstract value calculated by the abstract algorithm changes, and a new resource file name is generated. When the file is not updated, the resource file name is not changed, and the browser can directly read the cache to accelerate the loading speed.
(2) The method and the device use the new file name as the trigger condition of resource updating, and cannot cover the cache of the original version, so errors caused by the updating sequence cannot occur in the file switching process.
(3) The abstract algorithm adopted by the method has extremely low collision probability, so that the file names generated by processing cannot be the same as long as the file contents are inconsistent, and the scheme does not depend on other version control tools, thereby greatly simplifying the complexity of file version control and avoiding collision.
(4) In the method adopted by the disclosure, the speed is increased by adopting a multi-thread parallel processing mode in the file processing process. The efficiency is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure.
FIG. 1 is a flow chart of a method of example 1 of the present disclosure;
fig. 2 is a system block diagram of embodiment 2 of the present disclosure.
The specific implementation mode is as follows:
the present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments in the present disclosure may be combined with each other. The embodiments will be described in detail below with reference to the accompanying drawings.
In the technical solutions disclosed in one or more embodiments, as shown in fig. 1, a method for controlling caching of a network static resource file based on a digest algorithm, where before an application program is released, a server processes a deployment file of the static file, includes the following steps:
step 1, establishing a processed address lookup table for storing reference addresses of static resource files, and extracting reference files of the static resource files from application program deployment files to be issued;
step 2, matching and searching the content of the reference file according to the configured rule, and finding out all static resource reference addresses needing to be processed in the reference file;
step 3, setting the static resource reference addresses to be processed as the reference addresses of the current to-be-processed static resource files in sequence, searching whether the reference addresses of the current to-be-processed static resource files exist in a processed address lookup table, if so, executing step 5, otherwise, executing the next step;
step 4, searching for the referenced static resource file according to the reference address of the current static resource file to be processed, calculating the MD5 value of the searched static resource file according to a summary algorithm, renaming the static resource file obtained by searching according to the MD5 value obtained by calculation to obtain a new file name, and adding a key value pair consisting of the address of the original file and the new address in a processed lookup table; i.e. the original file address is used as a key and the new address is used as a value, which is put into the processed look-up table.
And 5, with the reference address of the current to-be-processed static resource file as a key, finding the address of the new file in the processed lookup table, and updating the reference address in the reference file into the address of the new file.
Through the steps, before the application program is released, the file name and the reference address of the static file in the reference file are updated according to the MD5 value, when the browser accesses, the static file can be found to be a new static file, the reference address is different from the file name cached by the browser, the browser downloads and caches the static file as a new file, and the static file is improved from a server side, so that the problem existing in the existing caching mechanism is solved.
In step 1, the step of extracting the reference file of the static resource file from the application deployment file to be published further includes a step of decompressing: decompressing the application program deployment file to be issued by adopting a multithreading parallel processing mode; the data can be decompressed into a temporary folder of a processing machine, and the performance of a multi-core CPU can be fully utilized due to the adoption of multi-thread parallel processing in the decompression process.
And 2, matching and searching the contents of all the reference files according to the configured rules, and finding out all the static resource reference addresses needing to be processed in the reference files.
The configured rule is description of static resource addresses in the reference file, regular expressions can be adopted, files can be matched through the regular expression method, and required contents and positions can be found, such as [0-9] matching numbers, [ a-z ] matching lowercase letters and the like.
In step 2, the reference file may be a plurality of files, typically an HTML file or a JSP file, where each reference file includes a plurality of static resource reference addresses.
Matching the content of all reference files may match each reference file in turn. To achieve the sequential processing of all the cited files, the following steps can be taken: and scanning the decompressed files, searching for the reference files of the static resource files, and storing all the reference files needing to be processed by establishing a file queue to be processed.
In some embodiments, renaming the static resource file obtained by searching according to the MD5 value obtained by calculation in step 4, and obtaining the new file name may specifically be: the MD5 value is added to the original file name to form the new file name. For example: the original file name is xxx.js, the new file name obtained by calculating the MD5 value to be 8d7584ca08a82d4d017c07a25ef4a219 after treatment is xxx.8d7584ca08a82d4d017c07a25ef4a219.js, and the original file is renamed to be the new file name. By naming the files by the MD5 value obtained based on the abstract algorithm, when the contents of the files are different, the obtained file names are different, and the identification degree of whether the contents of the updated static resource files are changed or not can be improved.
After the step 5, compressing the file into a file in an original format, which may specifically include the following steps: 1) and saving the modified reference file.
2) After all the reference files are processed, the temporary files can be repackaged into files in the original format at the designated positions.
In the case of the example 2, the following examples are given,
the embodiment provides a static resource file cache control system based on a digest algorithm, which includes:
a lookup table establishment module: the method comprises the steps of establishing a processed address lookup table used for storing reference addresses of static resource files;
the reference file extraction module: the reference file is used for extracting the static resource file from the application program deployment file to be issued;
the static resource reference address extraction module: the system comprises a configuration file, a processing module and a processing module, wherein the configuration file is used for matching and searching the contents of all reference files according to a configured rule and finding out all static resource reference addresses needing to be processed in the reference files;
a judging module: setting the static resource reference addresses to be processed as the reference addresses of the current to-be-processed static resource files in sequence, searching whether the reference addresses of the current to-be-processed static resource files exist in a processed address lookup table, and if so, turning to an updating module; otherwise, go to the renaming module of static resource file;
static resource file renaming module: searching for a referenced static resource file according to a reference address of a current static resource file to be processed, calculating an MD5 value of the searched static resource file according to a summary algorithm, renaming the static resource file obtained by searching according to an MD5 value obtained by calculation to obtain a new file name, and adding a key value pair consisting of an address of an original file and a new address in a processed lookup table;
an update module: and taking the reference address of the current to-be-processed static resource file as a key, finding the address of the new file in the processed lookup table, updating the reference address in the reference file into the address of the new file, and updating the application program deployment file to be released.
Example 3
The present embodiment provides an electronic device comprising a memory and a processor, and computer instructions stored on the memory and executed on the processor, wherein the computer instructions, when executed by the processor, perform the steps of the method of embodiment 1.
Example 4
This embodiment provides a computer-readable storage medium storing computer instructions that, when executed by a processor, perform the steps of the method of embodiment 1.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (10)
1. A static resource file cache control method based on an abstract algorithm is characterized by comprising the following steps:
step 1, establishing a processed address lookup table for storing reference addresses of static resource files, and extracting reference files of the static resource files from application program deployment files to be issued;
step 2, matching and searching the contents of all the reference files according to the configured rules, and finding out all the static resource reference addresses needing to be processed in the reference files;
step 3, setting the static resource reference addresses to be processed as the reference addresses of the current to-be-processed static resource files in sequence, searching whether the reference addresses of the current to-be-processed static resource files exist in a processed address lookup table, if so, executing step 5, otherwise, executing the next step;
step 4, searching for the referenced static resource file according to the reference address of the current static resource file to be processed, calculating the MD5 value of the searched static resource file according to a summary algorithm, renaming the static resource file obtained by searching according to the MD5 value obtained by calculation to obtain a new file name, and adding a key value pair consisting of the address of the original file and the new address in a processed lookup table;
and 5, with the reference address of the current to-be-processed static resource file as a key, finding the address of the new file in the processed lookup table, updating the reference address in the reference file into the address of the new file, and updating the application program deployment file to be released.
2. The method for controlling the caching of the static resource files based on the digest algorithm according to claim 1, wherein: renaming the static resource file obtained by searching according to the MD5 value obtained by calculation in step 4, wherein the new file name obtained may specifically be: the MD5 value is added to the original file name to form the new file name.
3. The method for controlling the caching of the static resource files based on the digest algorithm according to claim 1, wherein: in step 1, the step of extracting the reference file of the static resource file from the application deployment file to be published further includes a step of decompressing: and decompressing the application program deployment file to be issued by adopting a multithreading parallel processing mode.
4. The method for controlling the caching of the static resource files based on the digest algorithm according to claim 1, wherein: the reference file is multiple, and each reference file comprises multiple static resource reference addresses.
5. The method for controlling the caching of the static resource files based on the digest algorithm according to claim 1, wherein: the matching search of the contents of all the reference files in the step 2 can sequentially match and search each reference file: and establishing a file queue to be processed for storing all the reference files needing to be processed.
6. The method for controlling the caching of the static resource files based on the digest algorithm according to claim 1, wherein: and (5) processing the reference address of the static resource file to be processed in the steps 3 to 5 by adopting a multithreading parallel processing mode.
7. The method for controlling the caching of the static resource files based on the digest algorithm according to claim 1, wherein: the step 5 further includes a step of compressing the file into a file in an original format, and specifically includes: saving the modified reference file; and after all the reference files are processed, repackaging the temporary files into files in the original format.
8. A static resource file cache control system based on a summary algorithm is characterized by comprising the following components:
a lookup table establishment module: the method comprises the steps of establishing a processed address lookup table used for storing reference addresses of static resource files;
the reference file extraction module: the reference file is used for extracting the static resource file from the application program deployment file to be issued;
the static resource reference address extraction module: the system comprises a configuration file, a processing module and a processing module, wherein the configuration file is used for matching and searching the contents of all reference files according to a configured rule and finding out all static resource reference addresses needing to be processed in the reference files;
a judging module: setting the static resource reference addresses to be processed as the reference addresses of the current to-be-processed static resource files in sequence, searching whether the reference addresses of the current to-be-processed static resource files exist in a processed address lookup table, and if so, turning to an updating module; otherwise, go to the renaming module of static resource file;
static resource file renaming module: searching for a referenced static resource file according to a reference address of a current static resource file to be processed, calculating an MD5 value of the searched static resource file according to a summary algorithm, renaming the static resource file obtained by searching according to an MD5 value obtained by calculation to obtain a new file name, and adding a key value pair consisting of an address of an original file and a new address in a processed lookup table;
an update module: and taking the reference address of the current to-be-processed static resource file as a key, finding the address of the new file in the processed lookup table, updating the reference address in the reference file into the address of the new file, and updating the application program deployment file to be released.
9. An electronic device comprising a memory and a processor and computer instructions stored on the memory and executable on the processor, the computer instructions when executed by the processor performing the steps of the method of any of claims 1 to 7.
10. A computer-readable storage medium storing computer instructions which, when executed by a processor, perform the steps of the method of any one of claims 1 to 7.
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