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trim todo
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‎feed.xml‎

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@@ -84,7 +84,7 @@
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<title>This blog now has an Atom feed, and yours should probably too</title>
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<link href="https://gaultier.github.io/blog/feed.html"/>
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<id>urn:uuid:1f4df7db-eea8-5ef0-ae92-1038111f5dc9</id>
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<updated>2025-03-04T20:27:05+01:00</updated>
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<updated>2025-09-17T09:33:23+02:00</updated>
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<published>2023-12-15T12:23:43+01:00</published>
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</entry>
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@@ -100,7 +100,7 @@
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<title>Quick and easy PNG image size reduction</title>
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<link href="https://gaultier.github.io/blog/image_size_reduction.html"/>
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<id>urn:uuid:1cd73d67-ad32-5cdc-93a7-f4046d7cd4a5</id>
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<updated>2025-07-07T16:51:52+02:00</updated>
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<updated>2025-09-17T09:33:23+02:00</updated>
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<published>2024-02-23T11:27:43+01:00</published>
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</entry>
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<title>Making my static blog generator &lt;del&gt;11&lt;/del&gt; 33 times faster</title>
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<link href="https://gaultier.github.io/blog/making_my_static_blog_generator_11_times_faster.html"/>
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<id>urn:uuid:d29b6ec2-f895-5f2f-896f-2f343766fc85</id>
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<updated>2025-07-07T17:51:49+02:00</updated>
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<updated>2025-09-17T09:33:23+02:00</updated>
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<published>2025-02-19T15:13:54+01:00</published>
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</entry>
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‎todo.md‎

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+ some less than optimal encodings are forced to avoid accidentally using RIP relative addressing, e.g. `lea rax, [r13]` gets encoded as `lea rax, [r13 + 0]`
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- [ ] How to get the current SQL schema when all you have is lots of migrations (deltas)
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- [ ] Search and replace fish function
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- [ ] Go+Dtrace: Tips
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```
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pid$target::*DispatchMessage:entry {
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stack_offset =656;
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this->data=copyin(uregs[R_SP] + stack_offset, 16);
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tracemem(this->data, 16);
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this->body_len = *((ssize_t*)this->data+1);
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this->body_ptr = (uint8_t**)this->data;
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this->s = copyinstr((user_addr_t)*this->body_ptr, this->body_len);
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printf("msg.body: %s\n", this->s);
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}
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```
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```
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$ sudo dtrace -n 'pid$target::github.com?ory?kratos*SMSBody:return{ this->body_len = uregs[1]; this->body_ptr = (uint8_t*)uregs[0];
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this->s = copyinstr((user_addr_t)this->body_ptr, this->body_len);
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printf("msg.Body: %s\\n", this->s);
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}' -p $(pgrep -a kratos)
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```
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```
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10 2968 github.com/ory/kratos/courier.(*courier).DispatchMessage:entry
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0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
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0: 80 ae c7 01 40 01 00 00 1e 00 00 00 00 00 00 00 ....@...........
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msg.Body: Your recovery code is: 707144
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```
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```shell
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$ sudo dtrace -x flowindent -n 'pid$target::*createBrowserRecoveryFlow*:entry {this->trace=1;} pid$target::*selfservice*:entry,pid$target::*selfservice*:return /this->trace/ {} pid$target::*createBrowserRecoveryFlow*:return {this->trace=0;} ' -p $(pgrep -a kratos)
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dtrace: description 'pid$target::*createBrowserRecoveryFlow*:entry ' matched 3602 probes
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CPU FUNCTION
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10 -> github.com/ory/kratos/selfservice/flow/recovery.(*Handler).createBrowserRecoveryFlow-fm
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10 -> github.com/ory/kratos/selfservice/flow/recovery.(*Handler).createBrowserRecoveryFlow
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10 -> github.com/ory/kratos/selfservice/strategy/code.(*Strategy).RecoveryStrategyID
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10 <- github.com/ory/kratos/selfservice/strategy/code.(*Strategy).RecoveryStrategyID
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10 -> github.com/ory/kratos/selfservice/strategy/link.(*Strategy).RecoveryStrategyID
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10 <- github.com/ory/kratos/selfservice/strategy/link.(*Strategy).RecoveryStrategyID
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10 -> github.com/ory/kratos/selfservice/flow/recovery.Strategies.Strategy
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10 -> github.com/ory/kratos/selfservice/strategy/code.(*Strategy).RecoveryStrategyID
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10 <- github.com/ory/kratos/selfservice/strategy/code.(*Strategy).RecoveryStrategyID
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10 -> github.com/ory/kratos/selfservice/strategy/code.(*Strategy).RecoveryStrategyID
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10 <- github.com/ory/kratos/selfservice/strategy/code.(*Strategy).RecoveryStrategyID
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10 <- github.com/ory/kratos/selfservice/flow/recovery.Strategies.Strategy
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10 -> github.com/ory/kratos/selfservice/flow/recovery.NewFlow
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10 -> github.com/ory/kratos/selfservice/flow/recovery.NewFlow.SecureRedirectUseSourceURL.func1
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10 <- github.com/ory/kratos/selfservice/flow/recovery.NewFlow.SecureRedirectUseSourceURL.func1
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10 -> github.com/ory/kratos/selfservice/flow/recovery.NewFlow.SecureRedirectAllowURLs.func2
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10 <- github.com/ory/kratos/selfservice/flow/recovery.NewFlow.SecureRedirectAllowURLs.func2
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10 -> github.com/ory/kratos/selfservice/flow/recovery.NewFlow.SecureRedirectAllowSelfServiceURLs.func3
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10 <- github.com/ory/kratos/selfservice/flow/recovery.NewFlow.SecureRedirectAllowSelfServiceURLs.func3
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10 -> github.com/ory/kratos/selfservice/flow.AppendFlowTo
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10 <- github.com/ory/kratos/selfservice/flow.AppendFlowTo
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10 -> github.com/ory/kratos/selfservice/strategy/code.(*Strategy).NodeGroup
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10 <- github.com/ory/kratos/selfservice/strategy/code.(*Strategy).NodeGroup
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10 -> github.com/ory/kratos/selfservice/strategy/code.(*Strategy).PopulateRecoveryMethod
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10 <- github.com/ory/kratos/selfservice/strategy/code.(*Strategy).PopulateRecoveryMethod
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10 <- github.com/ory/kratos/selfservice/flow/recovery.NewFlow
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10 -> github.com/ory/kratos/selfservice/flow/recovery.(*HookExecutor).PreRecoveryHook
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10 <- github.com/ory/kratos/selfservice/flow/recovery.(*HookExecutor).PreRecoveryHook
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10 -> github.com/ory/kratos/selfservice/flow/recovery.(*Flow).TableName
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10 <- github.com/ory/kratos/selfservice/flow/recovery.(*Flow).TableName
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10 -> github.com/ory/kratos/selfservice/flow/recovery.(*Flow).TableName
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10 <- github.com/ory/kratos/selfservice/flow/recovery.(*Flow).TableName
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10 -> github.com/ory/kratos/selfservice/flow/recovery.(*Flow).TableName
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10 <- github.com/ory/kratos/selfservice/flow/recovery.(*Flow).TableName
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10 -> github.com/ory/kratos/selfservice/flow/recovery.(*Flow).TableName
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10 <- github.com/ory/kratos/selfservice/flow/recovery.(*Flow).TableName
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10 -> github.com/ory/kratos/selfservice/flow.(*State).Value
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10 <- github.com/ory/kratos/selfservice/flow.(*State).Value
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10 -> github.com/ory/kratos/selfservice/flow/recovery.(*Flow).AfterSave
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10 -> github.com/ory/kratos/selfservice/flow/recovery.(*Flow).SetReturnTo
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10 <- github.com/ory/kratos/selfservice/flow/recovery.(*Flow).SetReturnTo
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10 <- github.com/ory/kratos/selfservice/flow/recovery.(*Flow).AfterSave
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10 -> github.com/ory/kratos/selfservice/flow/recovery.(*Flow).AppendTo
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10 <- github.com/ory/kratos/selfservice/flow/recovery.(*Flow).AppendTo
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10 <- github.com/ory/kratos/selfservice/flow/recovery.(*Handler).createBrowserRecoveryFlow
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```
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```
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$ sudo dtrace -n 'pid$target::*SendRecoveryCodeTo:entry {this->len = uregs[5]; this->ptr = uregs[4]; this->str = copyinstr(this->ptr, this->len); printf("Code: %s\n", this->str);} pid$target::*SendRecoveryCodeTo:return {trace(uregs[R_R0])}' -p $(pgrep -a kratos)
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```
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```
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$ sudo dtrace -n 'struct flow {uint8_t pad1[136]; uint8_t* state_ptr; ssize_t state_len;}; pid$target::github.com?ory?kratos*GetRecoveryFlow:return {this->flow = (struct flow*)copyin(uregs[0],sizeof(struct flow)); this->state= copyinstr((user_addr_t)this->flow->state_ptr, this->flow->state_len ); trace(this->state);
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}' -p $(pgrep -a kratos)
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dtrace: description 'struct flow ' matched 2 probes
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CPU ID FUNCTION:NAME
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11 53391 github.com/ory/kratos/persistence/sql.(*Persister).GetRecoveryFlow:return choose_method
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```
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```
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struct flow {
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uint8_t pad1[136];
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uint8_t* state_ptr;
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size_t state_len;
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uint8_t pad2[128];
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uint8_t* payload_ptr;
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size_t payload_len;
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};
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pid$target::github.com?ory?kratos*GenerateCode:return {
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this->body_len = uregs[1];
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this->body_ptr = (uint8_t*)uregs[0];
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this->s = copyinstr((user_addr_t)this->body_ptr, this->body_len);
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printf("Code: %s\n", this->s);
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}
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pid$target::github.com?ory?kratos*SendRecoveryCodeTo:entry {
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this->body_ptr = (uint8_t*)uregs[R_R4];
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this->body_len = uregs[R_R3];
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this->s = copyinstr((user_addr_t)this->body_ptr, this->body_len);
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printf("Body: %s\n", this->s);
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}
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pid$target::github.com?ory?kratos*GetRecoveryFlow:return {
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this->flow = (struct flow*)copyin(uregs[0],sizeof(struct flow));
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this->state= copyinstr((user_addr_t)this->flow->state_ptr, this->flow->state_len );
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trace(this->state);
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if (this->flow->payload_ptr){
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this->payload= copyinstr((user_addr_t)this->flow->payload_ptr, this->flow->payload_len );
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trace(this->payload);
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}
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ustack(10);
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}
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pid$target::github.com?ory?kratos*UpdateRecoveryFlow:entry {
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this->flow = (struct flow*)copyin(uregs[R_R3],sizeof(struct flow));
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this->state= copyinstr((user_addr_t)this->flow->state_ptr, this->flow->state_len );
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trace(this->state);
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if (this->flow->payload_ptr){
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this->payload= copyinstr((user_addr_t)this->flow->payload_ptr, this->flow->payload_len );
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trace(this->payload);
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}
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ustack(10);
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}
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pid$target::github.com?ory?kratos*CreateRecoveryFlow:entry {
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this->flow = (struct flow*)copyin(uregs[R_R3],sizeof(struct flow));
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this->state= copyinstr((user_addr_t)this->flow->state_ptr, this->flow->state_len );
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trace(this->state);
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if (this->flow->payload_ptr){
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this->payload= copyinstr((user_addr_t)this->flow->payload_ptr, this->flow->payload_len );
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trace(this->payload);
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}
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ustack(10);
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}
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```
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See all SQL queries:
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```
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sudo dtrace -n 'pid$target::github.com?ory?pop?v6.Query.ToSQL:return {printf("%s\n", stringof(copyin(arg1,arg0)))}' -c './code.test -test.count=1 -test.v -test.run=Recovery'
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```
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- JS rand:
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```js
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const count = parseInt(process.argv[2])
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for (let i=0;i<count;i++){
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const s = Math.random().toString(36);
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const n = parseInt(s.slice(2), 36)
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console.log(n);
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}
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```
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```js
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const count = parseInt(process.argv[2])
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for (let i=0;i<count;i++){
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const n = Math.random();
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console.log(n);
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}
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```
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```js
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const crypto = require('crypto');
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const count = parseInt(process.argv[2])
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for (let i=0;i<count;i++){
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const randomBytes = new Uint8Array(4);
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crypto.getRandomValues(randomBytes)
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const n = randomBytes[0] | (randomBytes[1]<<8) | (randomBytes[2]<<16) | (randomBytes[3]<<24)
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console.log(n);
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}
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```
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```gnuplot
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set terminal pngcairo size 800,600 enhanced font 'Arial,10'
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set output 'rand.png'
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plot '~/scratch/rand.txt' with dots
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```
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## Blog implementation
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