382 lines
10 KiB
Markdown
382 lines
10 KiB
Markdown
R3
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================
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[](https://travis-ci.org/c9s/r3)
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[](https://coveralls.io/r/c9s/r3)
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R3 is an URL router library with high performance, thus, it's implemented in C.
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It compiles your route paths into a prefix trie.
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By using the prefix tree constructed in the start-up time, you can dispatch
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the path to the controller with high efficiency.
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Requirement
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-----------------------
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### Build Requirement
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* autoconf
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* automake
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* check
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* pkg-config
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### Runtime Requirement
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* pcre
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* (optional) graphviz version 2.38.0 (20140413.2041)
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* (optional) libjson-c-dev
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Pattern Syntax
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-----------------------
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/blog/post/{id} use [^/]+ regular expression by default.
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/blog/post/{id:\d+} use `\d+` regular expression instead of default.
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API
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------------------------
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```c
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#include <r3/r3.h>
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// create a router tree with 10 children capacity (this capacity can grow dynamically)
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n = r3_tree_create(10);
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int route_data = 3;
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// insert the route path into the router tree
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r3_tree_insert_path(n, "/bar", &route_data); // ignore the length of path
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r3_tree_insert_pathl(n, "/zoo", strlen("/zoo"), &route_data );
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r3_tree_insert_pathl(n, "/foo/bar", strlen("/foo/bar"), &route_data );
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r3_tree_insert_pathl(n ,"/post/{id}", strlen("/post/{id}") , &route_data );
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r3_tree_insert_pathl(n, "/user/{id:\\d+}", strlen("/user/{id:\\d+}"), &route_data );
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// if you want to catch error, you may call the extended path function for insertion
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int data = 10;
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char *errstr = NULL;
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node *ret = r3_tree_insert_pathl_ex(n, "/foo/{name:\\d{5}", strlen("/foo/{name:\\d{5}"), NULL, &data, &errstr);
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if (ret == NULL) {
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// failed insertion
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printf("error: %s\n", errstr);
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free(errstr); // errstr is created from `asprintf`, so you have to free it manually.
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}
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// let's compile the tree!
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char *errstr = NULL;
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int err = r3_tree_compile(n, &errstr);
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if (err != 0) {
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// fail
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printf("error: %s\n", errstr);
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free(errstr); // errstr is created from `asprintf`, so you have to free it manually.
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}
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// dump the compiled tree
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r3_tree_dump(n, 0);
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// match a route
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node *matched_node = r3_tree_matchl(n, "/foo/bar", strlen("/foo/bar"), NULL);
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if (matched_node) {
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int ret = *( (*int) matched_node->data );
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}
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// release the tree
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r3_tree_free(n);
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```
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**Capture Dynamic Variables**
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If you want to capture the variables from regular expression, you will need to
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create a `match_entry` object and pass the object to `r3_tree_matchl` function,
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the catched variables will be pushed into the match entry structure:
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```c
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match_entry * entry = match_entry_create("/foo/bar");
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// free the match entry
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match_entry_free(entry);
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```
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And you can even specify the request method restriction:
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```c
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entry->request_method = METHOD_GET;
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entry->request_method = METHOD_POST;
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entry->request_method = METHOD_GET | METHOD_POST;
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```
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When using `match_entry`, you may match the route with `r3_tree_match_entry` function:
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```c
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node *matched_node = r3_tree_match_entry(n, entry);
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```
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**Release Memroy**
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To release the memory, you may call `r3_tree_free(node *tree)` to release the whole tree structure,
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`node*`, `edge*`, `route*` objects that were inserted into the tree will be freed.
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### Routing with conditions
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```c
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// create a router tree with 10 children capacity (this capacity can grow dynamically)
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n = r3_tree_create(10);
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int route_data = 3;
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// insert the route path into the router tree
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r3_tree_insert_routel(n, METHOD_GET | METHOD_POST, "/blog/post", sizeof("/blog/post") - 1, &route_data );
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char *errstr = NULL;
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int err = r3_tree_compile(n, &errstr);
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if (err != 0) {
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// fail
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printf("error: %s\n", errstr);
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free(errstr); // errstr is created from `asprintf`, so you have to free it manually.
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}
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// in your http server handler
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// create the match entry for capturing dynamic variables.
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match_entry * entry = match_entry_create("/foo/bar");
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entry->request_method = METHOD_GET;
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route *matched_route = r3_tree_match_route(n, entry);
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matched_route->data; // get the data from matched route
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// free the objects at the end
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r3_route_free(r1);
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r3_tree_free(n);
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```
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Slug
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-----------------------
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A slug is a placeholder, which captures the string from the URL as a variable.
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Slugs will be compiled into regular expression patterns.
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Slugs without patterns (like `/user/{userId}`) will be compiled into the `[^/]+` pattern.
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To specify the pattern of a slug, you may write a colon to separate the slug name and the pattern:
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"/user/{userId:\\d+}"
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The above route will use `\d+` as its pattern.
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Optimization
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-----------------------
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Simple regular expressions are optimized through a regexp pattern to opcode
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translator, which translates simple patterns into small & fast scanners.
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By using this method, r3 reduces the matching overhead of pcre library.
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Optimized patterns are: `[a-z]+`, `[0-9]+`, `\d+`, `\w+`, `[^/]+` or `[^-]+`
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Slugs without specified regular expression will be compiled into the `[^/]+` pattern. therefore, it's optimized too.
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Complex regular expressions will still use libpcre to match URL (partially).
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Performance
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-----------------------
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The routing benchmark from stevegraham/rails' PR <https://github.com/stevegraham/rails/pull/1>:
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omg 10462.0 (±6.7%) i/s - 52417 in 5.030416s
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And here is the result of the router journey:
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omg 9932.9 (±4.8%) i/s - 49873 in 5.033452s
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r3 uses the same route path data for benchmarking, and here is the benchmark:
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3 runs, 5000000 iterations each run, finished in 1.308894 seconds
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11460057.83 i/sec
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### The benchmarking route paths
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The route path generator is from <https://github.com/stevegraham/rails/pull/1>:
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```ruby
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#!/usr/bin/env ruby
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arr = ["foo", "bar", "baz", "qux", "quux", "corge", "grault", "garply"]
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paths = arr.permutation(3).map { |a| "/#{a.join '/'}" }
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paths.each do |path|
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puts "r3_tree_insert_path(n, \"#{path}\", NULL);"
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end
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```
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Function prefix mapping
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-----------------------
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|Function Prefix |Description |
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|------------------|------------------------------------------------------------------------------------|
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|`r3_tree_*` |Tree related operations, which require a node to operate a whole tree |
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|`r3_node_*` |Single node related operations, which do not go through its own children or parent. |
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|`r3_edge_*` |Edge related operations |
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|`r3_route_*` |Route related operations, which are needed only when the tree is defined by routes |
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|`match_entry_*` |Match entry related operations, a `match_entry` is just like the request parameters |
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Rendering Routes With Graphviz
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---------------------------------------
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The `r3_tree_render_file` API let you render the whole route trie into a image.
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To use graphviz, you need to enable graphviz while you run `configure`:
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./configure --enable-graphviz
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Here is the sample code of generating graph output:
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```c
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node * n = r3_tree_create(1);
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r3_tree_insert_path(n, "/foo/bar/baz", NULL);
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r3_tree_insert_path(n, "/foo/bar/qux", NULL);
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r3_tree_insert_path(n, "/foo/bar/quux", NULL);
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r3_tree_insert_path(n, "/foo/bar/corge", NULL);
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r3_tree_insert_path(n, "/foo/bar/grault", NULL);
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r3_tree_insert_path(n, "/garply/grault/foo", NULL);
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r3_tree_insert_path(n, "/garply/grault/bar", NULL);
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r3_tree_insert_path(n, "/user/{id}", NULL);
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r3_tree_insert_path(n, "/post/{title:\\w+}", NULL);
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char *errstr = NULL;
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int err;
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err = r3_tree_compile(n, &errstr);
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if (err != 0) {
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// fail
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printf("error: %s\n", errstr);
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free(errstr); // errstr is created from `asprintf`, so you have to free it manually.
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}
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r3_tree_render_file(n, "png", "check_gvc.png");
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r3_tree_free(n);
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```
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Or you can even export it with dot format:
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```dot
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digraph g {
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graph [bb="0,0,205.1,471"];
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node [label="\N"];
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"{root}" [height=0.5,
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pos="35.097,453",
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width=0.97491];
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"#1" [height=0.5,
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pos="35.097,366",
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width=0.75];
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....
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```
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### Graphviz Related Functions
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```c
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int r3_tree_render_file(const node * tree, const char * format, const char * filename);
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int r3_tree_render(const node * tree, const char *layout, const char * format, FILE *fp);
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int r3_tree_render_dot(const node * tree, const char *layout, FILE *fp);
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int r3_tree_render_file(const node * tree, const char * format, const char * filename);
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```
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JSON Output
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----------------------------------------
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You can render the whole tree structure into json format output.
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Please run `configure` with the `--enable-json` option.
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Here is the sample code to generate JSON string:
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```c
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json_object * obj = r3_node_to_json_object(n);
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const char *json = r3_node_to_json_pretty_string(n);
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printf("Pretty JSON: %s\n",json);
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const char *json = r3_node_to_json_string(n);
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printf("JSON: %s\n",json);
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```
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Use case in PHP
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-----------------------
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**not implemented yet**
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```php
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// Here is the paths data structure
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$paths = [
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'/blog/post/{id}' => [ 'controller' => 'PostController' , 'action' => 'item' , 'method' => 'GET' ] ,
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'/blog/post' => [ 'controller' => 'PostController' , 'action' => 'list' , 'method' => 'GET' ] ,
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'/blog/post' => [ 'controller' => 'PostController' , 'action' => 'create' , 'method' => 'POST' ] ,
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'/blog' => [ 'controller' => 'BlogController' , 'action' => 'list' , 'method' => 'GET' ] ,
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];
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$rs = r3_compile($paths, 'persisten-table-id');
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$ret = r3_dispatch($rs, '/blog/post/3' );
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list($complete, $route, $variables) = $ret;
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// matched conditions aren't done yet
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list($error, $message) = r3_validate($route); // validate route conditions
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if ( $error ) {
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echo $message; // "Method not allowed", "...";
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}
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```
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Install
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----------------------
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sudo apt-get install check libpcre3 libpcre3-dev libjemalloc-dev libjemalloc1 build-essential libtool automake autoconf pkg-config
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sudo apt-get install graphviz-dev graphviz # if you want graphviz
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./autogen.sh
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./configure && make
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sudo make install
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#### Run Unit Tests
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./configure --enable-check
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make check
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#### Enable Graphviz
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./configure --enable-graphviz
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#### With jemalloc
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./configure --with-malloc=jemalloc
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License
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--------------------
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This software is released under MIT License.
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